stairs need to be wide enough for safe use, usually not less than 750 mm (see drawing below) the going (depth of the tread) and width of treads must be at least 250 mm (see drawing below) Allowable minimum dimensions of treads and risers Calculations still work around buildings being exited within 2.5 minutes. Staircases have the potential to be safety hazards if not designed properly. Knowing what kind of headroom or winder you can use is very, very important. Riser height and tread depth should be of a uniform height within a tolerance of ±5mm, in one flight. The width of the staircase depends on the number of people the building occupies. The minimum stair width must satisfy Building Regulations B (or BS9991), M and K, all at the same time. There are rules for direct fire escapes and disabled access and you will have to consult Part M of the building regulations Building Regulations Part M and talk to your building control officer who can interpret these rules differently. Commercial fire escape stairs width should also not be less than the width of the door that grants access to the exit stairs. Maximum width & length of staircases. Part T – Fire Protection – of SANS 10400 says that the rise and tread of any step forming part of an escape route must comply with the requirements given in SANS 10400-M – which is the part that covers Stairways. Taranaki 4614, Unit 6, 114 Sawyers Arms Road Nosings shall be rounded and should be between 15mm and 25mm. The minimum staircase width is the same as the minimum circulation zone width of 3ft / 0.91m. Minimum width between handrails on stairs shall be 900mm. Revolving doors shall not be used as required exits except in residential, business and mercantile occupancies, but shall not constitute more than half the total required door width. They must also not reduce in width at any point, from the top to the bottom. STAIRCASE CATEGORY: E A public stair intended to be used by large numbers of people at one time for example a stair in a place of public assembly. In design compliance for buildings, the minimum stair width will be the minimum to satisfy Building Regulations B (or BS9991), M and K, all at the same time. Approved Document M points to Approved Document K for further guidance, but the latter does not give guidance on the width of a “general access stair”.The diagram below attempts to interpret the guidance contained in the various documents: If the staircase design complies with the Approved Documents, then it is deemed to satisfy the Building Regulations. 7.9.8 Minimum Width Provision for Passageway/Corridors: As provided in Building Bye-Laws 4.8.7 7.9.9 Doorways: ... Fire escape staircase in the mercantile, business, assembly, hotel buildings above 24 m. height shall be a fire tower and in such a case width of the same shall not be less than the width of the main staircase. Fire Escape Plan Fire escape plan is to be provided for all buildings (except Purpose Group I) irrespective of height. The minimum staircase width is the same as the minimum circulation zone width of 3ft / 0.91m. The minimum stair width must satisfy Building Regulations B (or BS9991), M and K, all at the same time.For fire escape purposes from a small block of flats, BS9991 requires a 750mm wide stair. 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. When thinking about your staircase design solution you need to be aware of the following: The rise needs to fall between 150mm and 220mm (domestic) or 150mm and 170mm (commercial) The maximum angle of a domestic stair should be no more than 42° and commercial stairs no than 34° Staircase Width: 36 Inches, Minimum Staircase width refers to the side-to-side distance if you were walking up or down the stairs. Handrails shall be continuous, with no obstructions to the movement of the hand along their length. Min/Max Rise Per Tread: 150–190 Min Clear Width Between Handrails: 1000 Min Going Centre of Tread: 250 Minimum Clear Tread Width: Riser Height: Minimum Inner . Going: Minimum Centre . Tread width must be a minimum of 1200mm. Please Note: Every care was taken to ensure the information in this article was correct at the time of publication. Larger body sizes limit pedestrian flow and will have slower evacuation rates. When it comes to the width, there is no regulated minimum. No combustible material shall be allowed in the fire tower. A fire escape plan is for use by the public and occupants in case of a fire as well as for the fire fighters. If the stairs are more than 2 m wide, then they should be divided into flights of no less than 1,000 mm. The staircase should have no more than 36 rises without a change of direction. There must be a minimum of 2000 mm headroom at every stage while going … Fire escape stairs and balconies shall be provided with a top and intermediate handrail on each side. (2) The width of fire escape staircase shall not be less than 0.75metre, the width offire escape stair tread shall not be less than 15 cm, the height of the fire escape stair riser shall not exceed 19 cm, and the number of risers shall not exceed 16 per flight of stairs. However, it should be no less than 750mm. There is no maximum width of commercial staircase but they must be split into sections no wider than 2000mm, including adding an extra handrail, newel and spindles to divide up the staircase; For residential properties there are no restrictions for the length of a flight; however anything above 36 risers needs to have a 30° change of direction. M Access to and the use of buildings Vol 2 Buildings other than dwellings (England). The lettering height should be 2.5cm minimum, e.g., Staircase A, and located at the bottom of the sign. 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. administrator for LABC Warranty and is In all buildings handrail height should be between 900mm and 1100mm measured to the top of the handrail from the pitch line or floor. No electrical shafts or AC ducts and gas pipelines can run through the staircase. 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. An escape route is the width at 1,500 mm above floor level when defined by walls or, elsewhere, the minimum width of passage available between any fixed obstructions; A stair is the clear width between the walls or balustrades. direct access to the stairway provided they have a minimum deck area of 4.5 m², a width of no less than 900 mm and contain a fire hose station. Width. For example, an internal stair in a dwelling serving one room not being a living room or a kitchen, an access stair to an office not used by the public, or spiral fire escape stairs for a small number of people. Tread depth must provide adequate footing and be a minimum of 280mm. The rise has to fall between 150 and 220mm. The lettering height should be 2.5cm minimum, e.g., Staircase A, and located at the bottom of the sign. BS8300 Design of buildings and their approaches to meet the needs of disabled people. There are many factors to consider. Living spaces and stores cannot open up into the staircase. Northcote It provides a method of escape in the event of a fire or other emergency that makes the stairwells inside a building inaccessible. used for escape, maintenance or other purposes, but not as a normal route. Category: Stock image, Photographer: hlehnerer. Dividing staircase wider than 2000m is for better crowd control and orderly evacuation in times of emergency. Most importantly, stairs that are not wide enough can be dangerous during a fire, as they might impede escape. Handrails shall be securely fixed and rigid. on 25/09/2019. The fire escape shall be designed to support a live load of 100 pounds per square foot (4788 Pa) and shall be constructed of steel or other approved noncombustible materials. The minimum width of each escape stair will be 2120mm. Code of practice for the design, construction and maintenance of straight stairs and winders. Handrails shall be provided on both sides of accessible stairs and steps, including landings. What is the minimum effective width needed for ... Fire protection below an escape stair should be extended to the lowest ground level. The main staircase and fire escape staircase must be continuous from ground floor to the terrace level. Main entrances to the premises shall be of adequate width to allow easy access to the fire engine and in no case it shall measure less than 5 meters. They may or may not be located on the usual route of traffic when the premises are operating under normal circumstances. Current Building Regulations (Fire Safety, Approved Document B, 2010) specify a minimum width of 750mm for a final exit door, to accommodate a maximum of 60 people. Posted Minimum clear width between core pole & handrails: 600mm The latest edition came into effect 6 April 2013. For fire escape purposes from small blocks of flats BS9991 requires a 750mm wide stair. … the dimensions for the minimum width of staircases in Width of Escape Stairs (Table 14 on Page 88) and Firefighting Stairs (Paragraph #21.3.2 on Page 106) disregard the guidance given on Page 247 … and ignore the minimum clear staircase width (1.5m) required to safely assist the evacuation of a person in a manual wheelchair … Stair treads must have uniform rise within each flight and across consecutive flights (a 5mm difference can make stairs unsafe). Surprisingly, there is no minimum width for a staircase although it should be practical and safe for a person to use. at FIRE ESCAPE STAIR WIDTHS; For a stairway with a railing on just one side, stairway width can be a bit smaller, with a clear width of 31.5" in the space below the handrail height. A fire escape plan is for use by the public and occupants in case of a fire as well as for the fire fighters. 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 They should not be less than the dimensions given in the following table: 3.20: Widths of escape routes and exits Minimum Width of Staircase : There are no recommendations as to the minimum width of a staircase - Yes Really! Clearance must be a minimum of 900mm allowing for handrails. Stair treads must have uniform rise within each flight and across consecutive flights (a 5mm difference can make stairs unsafe). M Access to and the use of buildings Vol 1 Dwellings (England). Routes to the fire escape shall be free of obstruction at all times, except for a doorway leading to the fire escape, which shall have the required fire resistance. Introduction Fire safety in a building is determined by a number of ... width required for staircase from upper floors ; and that, if any, from the basements. The going must be betwee… M Access to and the use of buildings (Wales). a minimum of 75% post-consumer waste . An exit may be doorway, corridor, and passageways to an internal staircase or external staircase, ramps or to a veranda and/or terraces, which have access to the street or to roof of a building. The width of a fire escape shall conform to Articles 3.4.3.1., 3.4.3.2. and 3.4.3.4., except that the width is permitted to be reduced to 550 mm provided the fire escape serves, (a) not more than 3 storeys, and (b) not more than 15 persons. Handrails shall not have projecting ends that will create a hazard. Buildings must now comply with the Building Code of Australia - which has been given the status of building regulation by Australia's states and territories. Under staircase dimensions mistake. Registered in England No: 3642459, Guidance on minimum staircase widths in apartment blocks. Minimum and maximum rise per tread: 170-220mm . The width of the staircase depends on the number of people the building occupies. Non fire-fighting stair: 900mm (between handrails), Fire-fighting stair: 1100mm (between walls/balustrade). For stairs that form part of a means of escape, see Fire below. However, for the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty technical manual. This technical update provides additional guidance relating to fibre reinforcement in concrete. Minimum width for an escape route should ideally be 1050mm but in any case not less than 750mm and where wheelchair users are likely to use it not less than 900mm. AS 1657 – 4.4.4 Straight flights. Approved Document B states that the minimum width of a fire escape route or exit which will be used by 60 persons or less is 750 mm (Table 4 page 36). Tread width must be a minimum of 1200mm. Minimum Width of Staircase : There are no recommendations as to the minimum width of a staircase - Yes Really! Secondary domestic stair intended to be used by a limited number of people who are generally familiar with the stair: 600mm – typical minimum diameter 1500mm: 170-220mm: 120mm: 145mm: 350mm : Category B – Main Private Stair. Entrance to them shall be separate and remote from the internal staircase. Rises must be a maximum of 190mm. 02/02/2015 at 3:39 PM. Supplementary guidance on the design of stairs to help achieve compliance with the Building Regulations 1.0 Introduction Stairs serve many different functions in a building e.g. ... there are no recommendations for the minimum width of a staircase - yes, really! Fire escape stairs and balconies shall be provided with a top and intermediate handrail on each side. This should be no more than 7 3/4 inches. Make sure you are aware of Building Regulations requirements for staircases when thinking about your design. Please provide your details to download this file. The angle of pitch of a staircase shall be not less than 26.5 degrees and not greater than 45 degrees. Height wise, your door is OK; but it is too narrow for its purpose. 7.9.8 Minimum Width Provision for Passageway/Corridors: As provided in Building Bye-Laws 4.8.7 7.9.9 Doorways: ... Fire escape staircase in the mercantile, business, assembly, hotel buildings above 24 m. height shall be a fire tower and in such a case width of the same shall not be less than the width of the main staircase. Staircase Building Regulations UK. Login or Join to download. In terms of fire safety, the final exits on an escape route in a public building are known as fire exits. authorised and regulated by the Financial A stair riser is the back, vertical part of a step. Fire escape stairs and balconies shall support the dead load plus a live load of not less than 100 pounds per square foot (4.78 kN/m2 ). Semi-public and public stairs: refer to Dcument M (mentioned before) to facilitate access for disabled people and to the Technical Guidance Document B – Fire Safety for facilitating means of escape. The premises fire risk level will be obtained from your fire risk assessment (use medium risk if you are not sure of your premises risk level). Tread depth must provide adequate footing and be a minimum of 280mm. Ravenhall But it is far from straightforward. As a matter of interest, the minimum standard dimensions for a fire escape roof window (as opposed to a door) are 660mm by 1180mm. This distance must be at least 36 inches and does not include handrails. However it depends on how may person are likely to use the escape route and providing it does not reduce it too much it could be acceptable for a temporary period of time. The width of staircase of 2500mm is being divided into 2 sections of 1250mm each by the introduction of an intermediate handrail. For fire escape purposes from a small block of flats, BS9991 requires a 750mm wide stair. Maximum pitch is 37 degrees. Widths of stairs. If you want to pass spiral staircase building regulations, for example, you will have more homework to do. Staircase Riser Height: 7 3/4 Inches, Maximum . A handrail shall be able to support a weight of 110kg at any point. It also says that steps must have solid treads and risers. Landings must be at appropriate intervals along a stair or ramp to prevent undue fatigue, not exceeding 2500mm between landings. alphabetical order. Melbourne VIC 3023, 45A Mawhitiwhiti Rd They shall have a straight flight not less than 75 cm. This allows taking into account stair stringer trim such as shown in our photographs. The height of a handrail above the nosings of the tread shall be between 900mm and 1000mm. Christchurch 8052, Search across all our products, projects, literature and downloads. Min Clear Width Between Handrails: 900 Min Going Centre of Tread: 250. A fire escape is a special kind of emergency exit, usually mounted to the outside of a building or occasionally inside but separate from the main areas of the building. There are rules for direct fire escapes and disabled access and you will have to consult Part M of the building regulations Building Regulations Part M and talk to your building control officer who can interpret these rules differently. 1104.16.5.1 Examination. treads and risers. If you need help, contact us at Monkeytoe: we can help you from planning and design to manufacture and installation. Stair: Maximum pitch: Maximum riser height (mm) Minimum tread (mm) Service, minor private: 47° 220: 220: Secondary Private: 41° 200: 250: Common, main private: 37° 190: 280: Accessible: 32° 180: 310: Uniformity. at FIRE ESCAPE STAIR WIDTHS; For a stairway with a railing on just one side, stairway width can be a bit smaller, with a clear width of 31.5" in the space below the handrail height. Minimum Width (mm) 60: 750: 110: 850: 220: 1050: More than 220: 5mm per person: In calculating exit capacity, the document notes the further points: 3.21: If a storey or room has two or more storey exits it has to be assumed that a fire might prevent the occupants from using one of them. Going Maximum Outer Going: Category A – Small Private Stair. 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. 1.2. There are rules for direct fire escapes and disabled access and you will have to consult Part M of the building regulations and talk to your building control officer who may interpret these rules differently. Normanby It is not just about the angle of the staircase or its rise, but these seemingly small details as well, details that will ultimately determine if you end up with regulation stairs or not. It might be worth noting that there is potential for these to change over time, as average body size is increasing and specifications will eventually change to reflect this. All rights reserved. Landings, including mid-flight landings, must be a minimum length of 900mm. With developers under pressure as never before to make the most of every available space, reducing the size of communal areas and staircases must seem attractive. 6 Ravenhall Way © 2020 Monkeytoe Group. Stairways shall be ≥ 600mm wide inside the stiles and it is to have a minimum clearance of 550mm between rails. Stairs: Surfaces need to be slip-resistant under all conditions. BS5395-1 Stairs ladders and walkways. 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. Building regulations. B Vol 2 Fire Safety in buildings other than dwelling houses (England and Wales). When it comes to the headroom, regulations are once again pretty clear. This allows taking into account stair stringer trim such as shown in our photographs. The minimum width of treads, staircase, its arrangement, headroom, needs to follow the standards as prescribed by the NBC. a mean of escape, a means of access for ambulant disabled people or an effective and simple means of vertical circulation, or sometimes a combination of these. For fire escape purposes from small blocks of flats BS9991 requires a 750mm wide stair. Tread width must be a minimum of 1200mm. 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