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Stair Building Code Requirement Highlights. Staircase code states that stairs must be 3 feet wide or wider. For three simultaneous users, a minimum of 74” (188 cm) is recommended. open side of stairs to be 34” as measured from the nose of the stair treads. Updated daily. Minimum width below handrail is 31-1/2-inches. (2) If the required width of a ramp or f light of stairs is more than 2 200 mm, one or more intermediate handrail s continuous between landings shall be provided, and located so that there will be not more than 1 650 mm between handrail s. (3) handrail s shall be continuously graspable along their … In a building setting, a flight of stairs refers to a complete series of steps that connects between two distinct floors. R311.7.1 Width Stairways shall be not less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. Staircase riser height translates to the distance you move your foot either up or down from one step to an adjacent step. Private stairways serving an occupant load of less than 10 may be 30 inches wide. The minimum recommended stair landing length is 36" (or a length and width sufficiently greater than the swing of the door if … Nosings are required to overhang a minimum of ¾-in. Fixed stairways shall have a minimum width of 22 inches. Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height PHOTO 1. Most stairs are between 900mm – 1100mm wide, for comfortable use. The marking stripe shall be installed along the horizontal leading edge of the step and shall extend the full width of the step. Use our Size Comparison calculator to compare the dimensional properties of Stair Widths with other related elements from our database. A 5-foot diameter or larger stair will provide this standard stair width; Stair tread codes states that each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge; All treads will be identical The 12-inch (305 mm) dimension shall be measured from the widest point of the clear stair width at the walking surface of the winder. For example, the minimum hand clearance between the railing and the wall that it is mounted on is 1 1/2 inches. The minimum recommended stair width is between 34" and 36" ACROSS. and 50 deg. Staircase code states that stairs must be 3 feet wide or wider. The width shall not be less than specified elsewhere in this code. This distance must be at least 36 inches and does not include handrails. Any uniform combination of rise/tread dimensions may be used that will result in a stairway at an angle to the horizontal within the permissible range. But we point out that in general, the minimum recommended stair width is between 34" and 36" Across the width of the tread. This should be no more than 7 3/4 inches. Not only do the suggested standards help you build a safe staircase, but they also assist in building a comfortable staircase that you can use day in and day out, for years to come. There is currently no specified minimum width in the Building Code. See the Life Safety Code . Comfortable two person stair widths range between 49” (125 cm) to 60” (152 cm). 2018 RESIDENTIAL STAIR GUIDE SECTION R311.7 STAIRWAYS R311.7.1 Width. You must calculate the IBC stair width for multi-story stairways versus single-story stairways. This becomes an issue when stairs are installed in tight locations under codes that vary greatly from today’s current International Building Code (IBC) variants. This width is great for three winders to make a turn of 90 degrees. 27.3 NOSINGS The undersides of nosings shall not be abrupt. Or call us with your query on 0800 896 500. Therefore let us recap on the residential stair code requirements: Minimum 36 inch clear width for stairway. Be careful to note that some sections of stair railing code work in conjunction with other sections of stair code. Building codes mandate stairs should be at least 36 inches wide. Therefore, a stair with a projection on one or both sides must provide a minimum clearance width of 760 mm (860 mm – 100 mm). Imagine having a 12’ high stair in place with a riser height of 9” and a tread depth of 9”. The Stairs- Residential Building Code for the U.S. is a municipal regulation. Variations in riser height or tread depth shall not be over 1/4-inch (0.6 cm) on any stairway. But, this rule includes a phrase that states that its only for the required width. Doors opening onto a landing shall not reduce the landing to less than one-half the required width. Winding stairs and spiral stairs have several different code requirements. Narrow stairs make it more difficult to carry items up and down the stairs. discrepancy is allowed) The reason for the codes? (2) Stairs shall be installed between 30o and 50o from horizontal. Interior stairs from the house to the garage need not have a landing provided the door does not swing over the stairs. So what is the minimum staircase width required in an apartment block? However, the very minimum width between handrails is 44 inches. Critical measurements such as standard stairway width, riser height, and tread depth are not a matter of guesswork when you are remodeling or building a home. A stair riser is the back, vertical part of a step. Stairway landings and platforms are at least the width of the stair and at least 30 inches (76 cm) in depth, as measured in the direction of travel; 1910.25 (b) (5) When a door or a gate opens directly on a stairway, a platform is provided, and the swing of the door or gate … Be careful to note that some sections of stair railing code work in conjunction with other sections of stair code. See Fig. Provides the code requirements for the width of stairs, riser and run height, and nosing extension when buidling stairs. Be sure to check with your permitting agency about building codes that apply to your locality. Get daily tips and tricks for making your best home. (1) Stairways serving an occupant load of more than 50 shall be not less in width than 44 inches. 6 ft. 8 in. Staircase measurements are determined by common practice and by building code, which itself is often informed by generally approved practices. The width and length of the landings shall be not less than the width of the stairway. width difference is 3/8” based on all treads) 311.7.4.3 – Stair tread nosing must extend out ¾” to a maximum of 1 ¼” past front of riser unless the tread is 11” or larger (just like above 3/8” max. Recent building code revisions have reduced the openings between balusters to not larger than 4 inches. So this basically sums up the basic code requirements for residential stairs and their dimensions. The number of occupants on each floor will determine the required width of the stairs. The Stairs- Residential Building Code for the U.S. is a municipal regulation. Stair tread depth is more of an issue for descending, rather than ascending, stairs. Stair width: FIG 7 §1011.6: Landing Travel Top Distance 8 Stair width: FIG 7 §1011.6: Landing Travel Bottom Distance: Stair width: FIG 7 §1011.6: Landing Door Swing Clearance Stair Width ÷ 2: FIG 7 §1011.5.7.1; §1011.6: Landing Door Open Clearance 7" FIG 7 §1011.5.7.1; §1011.6: 1 Minimum of 36" for occupacy of less than 50. Staircases must be firmly fastened to the building. From the top flight of stairs to the bottom of the stairs, each individual riser cannot exceed a difference of 3/8 of an inch. Stairwell width and stair landing platform requirements are summarized by this sketch. Anyone walking up or down the stairs should have plenty of clear headroom without having to duck down. Note that handrails and constructions below handrails are not allowed to project more than 100 mm into the required stair width (X + Y ≤ 100 mm). Would you allow the minimum 36” Stair width based on occupant load of 41 persons per stairway? Minimum Tread Depth. Stairs, stairways, staircases, or stairwells, are building components that provide users with a means of vertical movement with the distribution of separate and individual vertical steps. Note that handrails and constructions below handrails are not allowed to project more than 100 mm into the required stair width (X + Y ≤ 100 mm). 3) Platform lengths shall be a minimum of 36 inches where exits do not open onto platforms. Open risers are not permitted. BS5395-1 Stairs ladders and walkways. The stair provisions of 7.2.2.2.1.2 require extra stair width for buildings, such as this high-rise building, where it is expected that occupants will still be in the process of leaving the building when emergency responders such as fire fighters arrive. Background As land and construction costs increase, developers are under increasing pressure to maximise usable space and minimise redundant space in buildings. Every staircase should have a landing at the top and bottom. Dimensions for Risers (1) The ... service stairs are stairs that serve areas used only as service rooms or service spaces and stairs that serve mezzanines not exceeding 20 m 2 within live/work units. Staircase risers should be adequately deep to allow a majority of your foot to have enough room to rest on the stair. The pitch angle should not be less than 26.5 degrees, and not greater than 45 degrees. R311.7.1 Width. Stairway landings and platforms are at least the width of the stair and at least 30 inches (76 cm) in depth, as measured in the direction of travel; 1910.25 (b) (5) When a door or a gate opens directly on a stairway, a platform is provided, and the swing of the door or gate … You can check current stair regulations in full here (PDF). The "nosing," or overhang of a step over its riser, cannot be more than 3/4-inch in width. 27a. (1) Stairways serving an occupant load of more than 50 shall be not less in width than 44 inches. A 5-foot diameter or larger stair will provide this standard stair width; Stair tread codes states that each tread will have a minimum of 7 1/2 inch tread depth at 12 inches from the narrow edge; All treads will be identical For stairs serving one floor, multiply the floor’s occupant load by 0.3. (2) Trim shall not reduce the required width by more than 3 1/2 inches. 1) Single-stair-width platforms shall be a minimum of 40 inches wide. Stairwell width and stair landing platform requirements are summarized by this sketch. The minimum recommended stair landing length is 36" (or a length and width sufficiently greater than the swing of the door if … The 12-inch (305 mm) dimension shall be measured from the widest point of the clear stair width at the walking surface of the winder. Stairways serving an occupant load of 50 or less may be 36 inches wide. Where this section requires a minimum clear width of 32 inches (813 mm) and a door opening … However, the minimum clear width of the stairway from the riser to the handrail must be at least 31.5 inches for one handrail, and 27 inches for two handrails. The Codes (2009 IRC): 311.7.1 – Stairways shall be a minimum of 36” wide 311.7.4.1 – Maximum Riser Height is 7 ¾” (max. Stairways serving an occupant load of 50 or less may be 36 inches wide. The following staircase code requirements pertain to straight-run stairs. So if the stair only has to be 36″ wide and they make it 96″ wide, the handrails at the edges are sufficient. Most importantly, stairs that are not wide enough can be dangerous during a fire, as they might impede escape. These rules are aimed at making staircases as safe as possible, so they should never be ignored or bypassed. Select an item from the list on the right to compare related dimensions. R311.7.1 Width. 1910.24(e) "Angle of stairway rise." This distance must be at least 10 inches. Section 1011.2 Minimum width shall be not less than 44”. at or below handrail height on each side . In general public spaces a minimum of 44” (112 cm) must be met—providing ample space for one person and allowing the tight passage of two people. For example, the minimum hand clearance between the railing and the wall that it is mounted on is 1 1/2 inches. §1011.2 For stairs serving a single user (typically private residential), a minimum of 36” (91 cm) is required. Rev 022019 GUARDRAILS HANDRAILS Handrail Wall H 1 ½” min. height difference of 3/8” based on all risers) 311.7.4.2 – Minimum Tread Depth is 10” (max. The treads and landings of all straight-run staircases should have an artificial light source capable of lighting the treads and landings to no less than 11 lux (approximately 1-foot candle). Stair width is defined as the clear width of the stair tread used as the walking surface. Join our monthly newsletter! Nosings are required to overhang a minimum of ¾-in. Comfortable two person stair widths range between 49” (125 cm) to 60” (152 cm). This becomes an issue when stairs are installed in tight locations under codes that vary greatly from today’s current International Building Code (IBC) variants. Exception #1: Stairways serving an occupant load less than 50 shall have a minimum width not less than 36”. 36 in. This means each winder stair creates a 30-degree angle. It's easy to make winder stairs. Regulated by building codes, stair details specify the sizes of risers and treads, stair widths, the placement of handrails and guardrails, and construction methods for fabricating stairs. A confirmation email has been sent. In a building setting, a flight of stairs refers to a complete series of steps that connects between two distinct floors. 12 ft. Exception #2: Clear width of 48” not required in building sprinkled throughout. At the same time, staircase code measurements do allow for some flexibility, since most measurements are accompanied by minimums or maximums. This stair would have (16) treads, 9”deep for a total run of 11’3”. Stairways shall be not less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. Staircases must be designed to allow safe access, escape and fire rescue access and the minimum requirements for these elements are covered by the Building Regulations. A stairway in which there is a noticeable variation between the risers is a safety hazard. Subscribed! Normal fire and building codes restrict the rise of stairs to not more than 12 feet. Public): 44” | 112 cm2 People: 49” | 125 cm2 People (Comfortable): 60” | 152 cm3 People: 74” | 188 cmHuman Body Accommodation: 22” | 56 cm, Drawings include:Stair Widths front elevations, front (people). Stairs, stairways, staircases, or stairwells, are building components that provide users with a means of vertical movement with the distribution of separate and individual vertical steps. 7.2.2.5.5.1 Exit Stair Treads. The radius of curvature at the leading edge of the tread shall be no greater than ½ inch (½" = 13mm). Private stairways serving an occupant load of less than 10 may be 30 inches wide. A prime example is the standard stair width. A step tread is the flat, horizontal surface that you walk on. Stair tread depths shall be 11 inches (279 mm) minimum. This stair would have (16) treads, 9”deep for a total run of 11’3”. For stair landing; the width of the landing shall not be less than the stairway width and a minimum of 600 mm clear of cross-traffic, door swing or any other structure. Scaled 2D drawings and 3D models available for download. Most stairs are between 900mm – 1100mm wide, for comfortable use. Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 1; Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 2 ; Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 3; Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 1; Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 2; Minimum Clear Height over Stairs, Ramp Australian Standard 1657 – 4.1 – Angle And Width Of A Stair’s Slope Regarding the width and angle of the slope, stairways shall not be less than 600 mm wide measured between the edges of the safety handrails. Code (below) requires minimum 36-inch width above handrail and below headroom height. 9 in. Stair details refer to the standard requirements for each of the various components of a flight of stairs. For three simultaneous users, a minimum of 74” (188 cm) is recommended. Beveling of nosings shall not exceed 0.5 inch (12.7 mm). Stair widths are based on the use and occupancy loads of adjacent spaces and must be serviced with handrails on one or both sides depending on the stair width.Consult the building code for details on specific occupancy loads. Or call us with your query on 0800 896 500. Width = 0.3 x floor’s occupant load Headroom (IBC 1011.3) Stairways are required to have a headroom clearance of 80 inches from the edge of each stair nosing measured vertically up to the ceiling. All stairs are required to comply with the following: 27.2 TREADS AND RISERS On any given flight of stairs, all steps shall ha ve uniform riser heights and unif orm tread w idths. The Ontario Building Code | Dimensions for Risers 9.8.4.1. The largest nosing projection cannot be more than 3/8 inch greater than the smallest nosing projection. The nosing shall project no more than 1-1/2 inches (38 mm). It is by no means all-inclusive or has all code related sections listed. In any case, the local code is what you must follow to pass inspections. Additionally, the riser measurement of all of the treads should be as close as possible to identical. Lee has over two decades of hands-on experience remodeling, fixing, and improving homes, and has been providing home improvement advice for over 12 years. Minimum Headroom . (1) Except as provided in Sentence (2), required exit stairs and public stairs serving buildings of residential occupancy shall have a width, measured between wall faces or guards, of not less than 900 mm. Where winders are adjacent within the flight, the point of the widest clear stair width of the adjacent winders shall be used. If winders are adjacent within the flight, the point of the widest clear stair width of the adjacent winders shall be used. Fixed stairs shall be installed at angles to the horizontal of between 30 deg. 3)Required exit stairs and public stairs serving buildings of other than residential occupancy shall have a width of not less than the greater of a) 900 mm, or b) 8 mm per person based … (2) Stairways. Open risers are not permitted. 1 Person (Private): 36” | 91 cm1-2 People (Min. The radius of curvature at the leading edge of the tread shall be not greater than 0.5 inch (12.7 mm). For any staircase that has six or more risers, there must be a wall switch at each floor level to control the light source. The width of interior stairs shall be the clear width between walls, grilles, guards, or newel posts. BS5395-1 Stairs ladders and walkways. (2) At least one stair between each floor level within a dwelling unit, and exterior stairs and required exitstairs serving a single dwelling unit, shall have a width of not less than 860 mm. Thus it varies by state and town. Every door must have, at a minimum, a floor area or landing with: (a) A width not less than the width of the door or the width of the stairway served, whichever is greater; and (b) A length not less than thirty-six inches. The tread depth is the distance from the front edge, or nosing (a tread projection that overhangs the riser below), of one step to the front edge or nose of the next step, measured horizontally. However, if the steps do not have nosings, and the steps have solid risers, not open risers, the minimum tread depth is 11 inches. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. If the stairs have open risers, the open space between the steps cannot be large enough to allow a 4-inch sphere to pass through. The minimum recommended stair width is between 34" and 36" ACROSS. J Minimum height of guards on porches, balconies, or raised floors is 36” This handout is intended to be a guide. 2) Doublestair-width platforms, or single- stair-width platforms with adjacent- passageways, shall be a minimum of 50 inches wide. All clinical staff shall have the keys, codes or other means necessary to operate the locking devices. Further, the tread measurement of every tread in a stairway should be as close as possible to identical. Stairways shall be not less than 36 inches (914 mm) in clear width at all points above the permitted handrail height and below the required headroom height. Stair risers must be between 4 and 7 inches high, and the depth of each step cannot be less than 11 inches. Stairways shall be ≥ 600mm wide inside the stiles and it is to have a minimum clearance of 550mm between rails. Stair codes are complex, and most people don't have the time to learn how all the codes relate to each other. Summary of Code Requirements for Residential Stairs. The width must continue up to the minimum headroom of 80 inches above the tread or landing surface. Maximum Height Between Landings . except projections not more than 114 mm (4½ in.) IBC Stair Width Calculation Calculating the IBC stair width can be complicated because it is determined by the building’s occupant load, so we have put together this simplified version of the IBC codes. If under 50 occupants you can go to 36″ width. Florida Building Code, Residential. The width of the landing, measured perpendicular to the direction of travel, must be no less than the width of the staircase. 311.7.4.2 – Minimum Tread Depth is 10” (max . to a maximum of 1-¼-in. ©2020 Dimensions.com | All rights reserved. Select an item on the right to compare relative dimensions to Stair Widths. Our team is familiar with the technical requirements of stairs and will be happy to assist with your query. Width. Nosing. Thus it varies by state and town. On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths. The rule is that you are supposed to be within 30″ of a handrail at any point on the stair, so you see intermediate handrails in wide stairs for this purpose. Knox County Code Administration & Inspection 2018 IRC Residential Stairs Information 2018 IRC Section R311.7.8 HANDRAILS R311.7.8 Handrails. In other words, the space must be slightly less than 4 inches high. Landing . Low headroom may result in staircase users hitting their heads on their way down the stairs. Stair stringers may project into the required width not more than two inches on each side of the stair. (2) Trim shall not reduce the required width by more than 3 1/2 inches. Minimum width clear of all obstructions . The Spruce uses cookies to provide you with a great user experience. 4.9.3 Nosings. … This code specification was developed to prevent stairs from being too high if walking upstairs or too low if descending. The minimum depth, measured in the direction of travel, is 36 inches. The greatest riser height within a flight of stairs cannot exceed the smallest by more than 3/8 inch. At any point on the staircase, a user should have a full 6 feet, 8 inches minimum vertical distance between the top of the stair tread and the bottom of the ceiling. Is it Hard to Make Winder Stairs? Width. Stair Building Code Requirement Highlights. Interior stairs shall be at least forty-four inches wide except as follows: The IRC 2018 Residential Code with amendments was used Not all staircase measurements are universally the same in all parts of the country, though. Stair riser heights shall be 7 inches (178 mm) maximum and 4 inches (102 mm) minimum. Many communities adopt the International Building Code wholesale, while others make modifications. U:\Progress\Dana\POLICY\Stair Treads\International Building Code Stair treads and risers.doc 06/23/2014 1009.3.3 Profile. 3DM, OBJ, SKP formats, Dimensions is a project by Fantastic Offense. Minimum clear walking path of 26 inches. Stair treads shall be no less than 11 in (280 mm) wide, measured from riser to riser. The nosing on treads, believe it or not, has a code minimum and maximum of how far the nosing projects over the next stair. Private stairways shall be a minimum of thirty-six inches wide. The greatest tread depth within a flight of stairs cannot be more than 3/8 inch larger than the smallest tread depth. Minimum clear walking path of 26 inches. Provides the code requirements for the width of stairs, riser and run height, and nosing extension when buidling stairs. Our team is familiar with the technical requirements of stairs and will be happy to assist with your query. A prime example is the standard stair width. This may also lead to a user looking away from their path for their head to clear the obstruction. width difference is 3/8” based on all treads) Stairways have to be at least 44″ if you have an occupant load over 50 (and may be more if your occupant load is large). Nosings must project at least 3/4 inch and no more than 1 1/4 inches beyond the riser below. Exit stair treads shall incorporate a marking stripe that is applied as a paint/ coating or be a material that is integral with the nosing of each step. Stairs that are too narrow are a hazard in many ways. In short, the width is calculated by multiplying the occupant load served by such stairs by a factor of 0.3 inch per occupant. Concrete Steps in Gardens. Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 1; Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 2 ; Measurement of Clear Height over Stairs – Parts 3 and 9 - slide 3; Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 1; Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 2; Minimum Clear Height over Stairs, Ramp Maximum 4-1/2 inch handrail projection into stairway width, on either side. Refer to the Municipal Code (13-160-300). In general public spaces a minimum of 44” (112 cm) must be met—providing ample space for one person and allowing the tight passage of two people. From the top flight of stairs to the bottom of the stairs, each individual riser cannot exceed a difference of 3/8 of an inch. A comprehensive reference database of dimensioned drawings documenting the standard measurements and sizes of the everyday objects and spaces that make up our world. I'm thinking my home builder has sized my stairs too narrow to meet code, but he disagrees. For 3D Downloads of this element, upgrade to a Dimensions Pro Membership. to a maximum of 1-¼-in. Code of practice for the design, construction and maintenance of straight stairs and winders. No interior stair shall be reduced in width in the direction of exit travel. Staircase width refers to the side-to-side distance if you were walking up or down the stairs. Trim and handrails may not encroach into this minimum width by more than 3 1/2 inches. Imagine having a 12’ high stair in place with a riser height of 9” and a tread depth of 9”. Watch Now: How to Keep Your Stairs up to Code The nosing on treads, believe it or not, has a code minimum and maximum of how far the nosing projects over the next stair. HOME HARDWOOD STAIRS Hardwood Stairs: Residential Building Codes, US: Stairs Residential Building Code for the United States. By using The Spruce, you accept our, Staircase Riser Height: 7 3/4 Inches, Maximum, Staircase Tread (Run) Depth: 10 to 11 Inches, Minimum, Staircase Headroom: 6 Feet, 8 Inches, Minimum, Deck Code Guidelines for Guardrails and Stairway Railings, Stone Steps vs. Using toenails or nails to attach the stairs is prohibited because the weight of people using the stairs might cause these fasteners to be pulled loose. We created this guide to help stair designers navigate through the complexity. At this point a landing must be provided which will have a length at least the same as the width of the steps leading up to it. Each stair tread is 11 inches (280 mm) deep minimum with a sloped riser. 2)Exit stairs serving a single dwelling unit shall have a width of not less than 860 mm. My stairs have a baseboard on each side of the stairs (1/2" thick), and stair width measurement is 35" at tread (baseboard-to-baseboard), however, a few inches above the baseboard, the stair width measures 36" (paint-to-paint). Handrails must be placed every 60” (152 cm). You can check current stair regulations in full here (PDF). Code of practice for the design, construction and maintenance of straight stairs and winders. Be careful to note that some sections of stair railing code work conjunction. 2018 Residential code with amendments was used 1 ) Single-stair-width platforms shall be a guide foot to have room. Is met, you can check current stair regulations in full here ( PDF.... A complete series of steps that connects between two distinct floors great for three simultaneous users, minimum! ( below ) requires minimum 36-inch width above handrail and below headroom height in ). Height of 9 ” deep for a total run stair width code 11 ’ ”... 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The radius of curvature at the edges are sufficient each step can not exceed the smallest tread depth 9! 022019 GUARDRAILS handrails handrail wall H 1 ½ ” Min and 50o from.. Staircase users hitting their heads on their way down the stairs are between 900mm – 1100mm wide, for use... The clear width for stairway depth is more of an issue for descending, than..., SKP formats, dimensions is a safety hazard 36 '' ACROSS a stair is... Foot to have enough room to rest on the Residential stair code requirements mandate stairs should as. All staircase measurements are universally the same in all parts of the shall. In an apartment block for Residential stairs, on either side in here! In any case, the space must be between 4 and 7 inches ( 38 mm ) and! 13Mm ) 06/23/2014 1009.3.3 Profile handrail projection into stairway width, on either side the depth of ”... Into stairway width, on either side any case, the point of the stair 3/4. Provided the door does not include handrails width standard is met, you can check current stair regulations in here! To help stair designers navigate through the complexity on 0800 896 500 Trim and handrails not! It is mounted on is 1 1/2 inches nosing, '' or overhang of a flight stairs. Fixed stairs shall be a minimum of 36” ( 91 cm ) an adjacent step as stair width code walking.. The step and shall extend the full width of the various components of a step tread is 11 inches 7! Nosing projection can not be more than 1-1/2 inches ( 280 mm ) wide stair width code measured the... The list on the right to compare related dimensions than ½ inch ( 12.7 ). In all parts of the various components of a step tread is 11 inches ( 280 mm ) deep with! An item on the Residential stair code requirements do not open onto platforms overhang a minimum of ¾-in flight stairs. 12.7 mm ) flat, horizontal surface that you walk on stairway rise. of. N'T have the keys, codes or other means necessary to operate the locking.! J minimum height of 9 ” deep for a total run of 11 ’ ”! States that its only for the U.S. is a municipal regulation – wide! 50 occupants you can check current stair regulations in full here ( PDF ) far as you wish sure check! | 91 cm1-2 people ( Min head to clear the obstruction rules are aimed at making staircases safe! Be greater than ½ inch ( 12.7 mm ) minimum can expand the.! The minimum staircase width required in an apartment block or bypassed this guide to help stair designers navigate through complexity. Open onto platforms people ( Min importantly, stairs that are too narrow meet. Provide you with a riser height of guards on porches, balconies, single-! The very minimum width of 22 inches this distance must be 3 feet or... Construction costs increase, developers are under increasing pressure to maximise usable space and redundant... Width required in an apartment block sections of stair widths ” as measured from the house to the you... Standard is met, you can check current stair regulations in full here ( PDF ) measured. Other sections of stair railing code work in conjunction with other sections of stair code.. Stair shall be installed at angles to the minimum hand clearance between the railing and the depth of 9.! Of a step tread is 11 inches ( 102 mm ) height translates to the side-to-side distance if were! Complex, and nosing extension when buidling stairs multiplying the occupant load less... Result in staircase users hitting their heads on their way down the stairs stairway.. And does not swing over the stairs ' width as far as wish. And tricks for making your best home usable space and minimise redundant in. E ) `` angle of stairway rise. ) treads, 9 ” deep a... The obstruction code, which itself is often informed by generally approved practices less. Normal fire and Building codes restrict the rise of stairs can not be than. Step over its riser, can not exceed 0.5 inch ( 12.7 mm ),! Is the minimum recommended stair width is calculated by multiplying the occupant load served by such stairs by a of! Reduced in width than 44 ” elements from our database 11 ’ 3 ” shall be no less 10! Clear width for stairway than 50 shall have a landing at the edges are sufficient restrict the rise of,... May also lead to falls for the width of the stair rule includes phrase. Staircase width refers to a complete series of steps that connects between two distinct floors in!

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