Sec. Stairs (1) Stairs shall be inclined at an angle of not more than 45° with the horizontal, and their steps shall have risers not more than 210 mm high and treads not less than 220 mm wide exclusive of nosing. If difficulties arise, some building control officers may allow you to build a newel out from the wall to meet the regulations. “going” refers to the horizontal dimension from the front to the back of a tread (or the width of the stair tread you place your foot on). Minimum width of stairs serving more than 50 occupants. 27.00: STAIRS b. 27/09/2019 Mike Mahajan HOUSE CONSTRUCTION 3 comments. You can check current stair regulations in full here (PDF). The North Carolina building code provides the minimum requirements for stairs to be considered safe for use. The minimum width of each door opening shall be sufficient for the occupant load thereof and shall provide a clear width of not less than 32 inches (813 mm). A stair lift may be fitted to a private stair and may project into the effective width of the stair. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway and the minimum clear width of The pitch of long stairs should be made flatter by introducing landing. Minimum riser height is eight inches. STAIR WIDTH The width of a flight of stairs shall be measured as the width of the narrowest tread in a stair or flight of stairs, as illustrated in Figure 2. A width of a stair landing cannot be less than the width of the stair itself, and the length (in direction of travel) cannot be less than 36 inches, according to the Internation Residential Code (IRC 311.7.6). Read More. If this is unavoidable (perhaps if the building is set on a sloped site) then, any stairs on the entrance level of the house must have a minimum stair width of 900mm (Building Regulations Approved Document K , 1.16). Minimum width of a tread for non residential building should be 300 mm. Minimum width of a tread for residential building should be 250 mm. Headroom for Loft Conversions : For loft conversions the available headroom will comply with the building regulations provided that the height at the centre of the stair width is at least 1.9 metres, reducing to a minimum of 1.8 metres at the side of the stairs. However in such cases, at least 1 handrail should be present as described in clause 4.3.14 and, when not in use, the installation should: In special case due to non availability of space, the minimum width of tread for residential building and small commercial units should be 200 mm. The handrail shall continue to slope for a distance of the width of one tread from the bottom riser; the remainder of the extension shall be horizontal. R311.5.1 Width. Winder stairs must have a minimum of nine inches at the 12-inch mark, with a minimum width of six inches at the narrowest edge. 06/04/2019 Mike Mahajan HOUSE CONSTRUCTION 3 comments. According to the International Residential Code, the minimum tread (or where you’re stepping) should be close to 20 inches minus 4/3 of the riser height. The Ontario Building Code | Stair Width 9.8.2.1. 750 mm. Some codes such as CA/OSHA specify a minimum stairway width of 24" [35].. 27d. Minimum width of a flight of stairs For accessibility you should try to avoid a stepped level change on the entrance storey of a house. Minimum run of a stair for Group A dwellings (residential) 200 mm. There is currently no specified minimum width in the Building Code. Length. Stairways shall not be less than 36 inches (914 mm) in clear width at all points above the permittedhandrail height and below the required headroom height. 2012 RESIDENTIAL STAIR GUIDE . There are four types of stairs that are allowed in residential buildings per the 2009 International Residential Code ... back stairs. The tread depth shall be measured horizontally between the vertical planes of the foremost projection of adjacent treads and at a right angle to the tread's leading edge. Unlike residential stairs per the IRC, where the width is just a given measurement, commercial stair width per the IBC is based on capacity. For loft conversions, the headroom can be a minimum of 1.8metres at the low-ceiling side of the stairs and a minimum of 1.9metres in the centre of the staircase width. There is no minimum width stipulated for a domestic staircase within part K of the building regulations. Width of Stair. For fire escape purposes from a small block of flats, BS9991 requires a 750mm wide stair. The tread width shall be not less than the going and there shall be a minimum overlap of 10 mm . Variations between tread depths and riser heights must be no more than 0.375 inches. 4.2.3 Habitable Rooms Size and Width The minimum size and width shall be as given in Table 4.2 Table 4.2 Minimum Size and Width of Different Components of Residential Premises Sl. A flight is limited in length to restrict the distance a person could fall down a set of stairs. R311.7.1 Width. Using the proper measurements for stairs creates a safe stepping distance that feels natural to the person using the staircase. However, it is generally accepted that on a main staircase, going up to the first floor serving multiple rooms should be no less than 800mm, however, we would recommend 850mm to 950mm as this allows more space to get things up the stairs. 4. Clear openings of doorways with swinging doors shall be measured between the face of the door and … this is not the minimum just me trying to force my standards onto the world!! 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. The minimum recommended stair width is between 34" and 36" Across the width of the tread. Building Bye-Laws and Standard Dimensions of Building units. In order to determine this the code refers us to Section 1005.1, but before we look at this section the code does say that the minimum width shall not be less than 44 inches. Other length recommendations for building tiny house stairs include: Headroom. if the width is 1000, the landing should also be 1000 deep. CIVICATEGORIES. Minimum Width: Residential: 1.00 – 1.25 m: Residential hotel: 1.5 m: Assembly: 2.00m : Educational: 1.50 m: Institutional: 2.00 m: The minimum width of stairs for the different types of buildings is shown in the table above. No. Minimum domestic handrail heights of 900mm for both stairs and landings, public handrail heights should be a minimum of 900mm on stairs and 1100mm on landings. for a comfortable stair use a riser of 172mm, going of 280mm and nothing less than 1000mm width. Read More. Our team is familiar with the technical requirements of stairs and will be happy to assist with your query. 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. The greatest tread depth within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm)." The width of stairs for public buildings should be 1.8 m and for residential buildings 0.9 m. 3. Spiral Stairways. For dwellings 1.16 In exceptional circumstances where severely sloping plots are involved, a stepped change of level within the entrance storey may be unavoidable. The minimum recommended stair landing length is 36" (or a length and width sufficiently greater than the swing of the door if … Component of Building Min. At the bottom , extend at least 12 inches ( 12" = 305m m) plus the width of one tread beyond the bottom riser. Pitch of Stair. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway PHOTO 2 and the See Fig. SECTION R311.5 STAIRWAYS . Minimum ceiling height from 3rd floor to succeeding floors with artificial ventilation. - A minimum stair width between enclosing walls, strings or upstands of 1200mm. Stair tread depths shall be 11 inches (279 mm) minimum. (2) Stairway headroom shall be not less than 1 950 mm plus the height of one riser measured vertically above the nosing of any tread or platform. Minimum width of stairs serving less than 10 occupants. These stairs require a clear width at and below the handrail of at least 26 inches. The minimum stair width must satisfy Building Regulations B (or BS9991), M and K, all at the same time. It is also a Building Regulations requirement that no openings in any balustrading should allow the passage of a 100mm sphere. The headroom is the space above your head as you enter the loft. The minimum tread depth shall be 10 inches (254 mm). The Ontario Building Code | Stairs 3.4.7.5. Most stairs are between 900mm – 1100mm wide, for comfortable use. Minimum run of a winding stair. - A minimum width between handrails of 1000mm. Residential Stairs R311.7 Stairways. minimum. Width. Or call us with your query on 0800 896 500. 1.10 meters. Stair Width (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. 1006.6. The flight of the stairs should be restricted to a maximum of 12 and minimum of 3 steps. “flight” refers to the area of stair that has a continuous slope or series of risers. Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 2 Minimum Clear Height over Stairs, Ramps and Landings – Part 3 - slide 3 Measurement of Risers and Runs – Parts 3 and 9 - slide 1 Approved Document M Vol1 (England) refers to a “general access stair” for common areas in flats where a lift is not provided, and a “utility stair” where a lift is available. Disclaimer Every reasonable effort is made to ensure that the information provided on this website is accurate, however no guarantees for the currency or accuracy of information are made. 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 on … requirement for plots above 50 sq m. Area 7.50 sq m. Area 9.50 sq m. Width 2.10 m. Width 2.40 m. i think the BCA will say 750mm is the min. 2018 RESIDENTIAL STAIR GUIDE SECTION R311.7 STAIRWAYS R311.7.1 Width. Tread: it is horizontal width of a stair step Design of Staircase Calculation – Riser and Tread. 2)Exit stairs serving a single dwelling unit shall have a width of not less than 860 mm. width, will check that on Monday for you. A landing is required at the top and bottom of stairs, with two exceptions: Circular stairways may be used as an exit, provided the minimum width of run is not less than 10 inches (254 mm) and the smaller radius is not less than twice the width of the stairway. COMMERCIAL STAIR WIDTH. Projections into the required width of stairways and ramps at each handrail shall not exceed 4.5 inches (114 mm) at or below the handrail height. Residential building codes vary substantially from municipality to municipality and should be checked locally, but at minimum a hallway width should be no less than 36 inches. Tread of stairs. Handrails shall not project more than 4.5 inches (114 mm) on either side of the stairway PHOTO 2 and the minimum Tag: minimum width of stairs residential. IBC 1012.7 clear width between handrails on ramps - note that this is a minimum not a maximum width: On ramps, the clear width between handrails shall be 36 inches (914 mm) minimum. requirement for plots upto 50 sq m. Min. The largest tread width or riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). A minimum headroom of 2 metres is required at all points on and off a staircase.