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Staircase Construction Regulations

Any staircase or balustrade to a storage area or un-habitable rooms must comply too all other regulations above apart from BCA Part 3.9.1.4. The Staircase rise and goings for an un-habitable room must be constructed in accordance with AS 1657 – 4.2.1.

An Staircase Construction Regulations


The information below is intended to be used as a guide ONLY and specifically tailored for Building Class 1 & 10. If you are constructing a staircase in Class 2-9 Building, other regulations suiting your class of building may be required.


Staircase Construction

When designing your staircase you will need to follow the current Building Code of Australia. Staircases and Balustrades for use externally or between habitable rooms in residential buildings 1&10 can be found in section 3.9.1 Stair Construction and 3.9.2 Balustrades. Other references to staircase construction can be found in the Australian Standard AS1657 Section 4 – Stairways. Below is an overview of this information to help you design your staircase to suit these regulations.


BCA Part 3.9.1 – Staircase Construction

General Requirements – Staircase used in habitable rooms or used externally must comply with the Building Code of Australia Part 3.9.1.3 & Part 3.9.1.4. All areas not specified in Building Code of Australia should be referenced in the Australian Standard AS1657 Section 4.

Staircases to storage areas or un-habitable rooms such as attics can be constructed outside the Building Code of Australia though must comply too the Australian Standards AS 1657.


BCA Part 3.9.1.3 – Staircase Construction

 

Your staircase must have no less than 2 risers or have no more than 18 risers without a 750mm2 landing or rest area.

Each tread and riser must be of the same measurement within a single flight.

The riser opening if your staircase is of Open Rise Construction must not allow a 125mm sphere to pass through.

All treads and top nosing must have a slip-resistant finish or a non-slip strip system near the edge of each tread nosing.

A flight must not have more than 3 winders in a quarter landing section or 6 winders in a half landing section.

If a door in your home opens onto a staircase a landing is required unless the floor to floor dimension is less than 570mm. If the floor to floor is less than 570mm all that is required is a zero tread.






















AS 1657 – 4.1 WIDTH AND ANGLE OF SLOPE

Stairways shall be not less than 600 mm wide measured between the inside edges of the handrails.

The angle of pitch of a staircase shall be no less than 26.5 degrees and not greater than 45 degrees.

AS 1657 – 4.4.4 Straight flights

Your staircase must have no more than 18 risers without a 750mm2 landing or rest area. The staircase should have more than 36 rises without a change of direction.

AS 4 3.2 Minimum vertical clearance (Head Height)

Unless otherwise approved by the regulatory authority, the head clearance shall be not less than 2000 mm measured vertically from the nosing line.

Riser and Going Dimensions


BCA Part 3.9.1.4 - Riser and Going Dimensions

The riser and going dimensions of each flight, except for in winders must comply too the Figure 3.9.1.2 seen below





























Staircases to storage areas or un-habitable rooms

Any staircase or balustrade to a storage area or un-habitable rooms must comply too all other regulations above apart from BCA Part 3.9.1.4. The Staircase rise and goings for an un-habitable room must be constructed in accordance with AS 1657 – 4.2.1.


AS 1657 – 4.3.1 Rises and goings

Each rise shall be not less than 150 mm and not greater than 215 mm.

Each going shall be not less than 215 mm and not greater than 305 mm.

The product of the going, measured in millimetres, and the rise, measured in millimetres, shall be not less than 45 000 and not greater than 48 000.


The tread width shall be not less than the going and there shall be a minimum overlap of 10 mm

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