What is the maximum gradient for a wheelchair ramp in the UK?

Under Approved Document M and BS 8300:2018, the maximum gradient for a permanent wheelchair ramp is 1:12 (8.3%). However, the preferred gradient is 1:15 (6.7%) as this is easier for wheelchair users to navigate independently. For ramps with a going over 10m, a gradient no steeper than 1:20 is recommended.

How often do I need landings on a wheelchair ramp?

Intermediate landings are required every 500mm of rise as per BS 8300. Each landing must be at least 1200mm long (clear of any door swing) and the full width of the ramp (minimum 1500mm). Top and bottom landings are always required regardless of ramp length.

What width should a wheelchair ramp be?

Part M requires a minimum clear width of 1200mm for a wheelchair ramp. However, BS 8300 recommends 1500mm to allow unassisted wheelchair access and to provide space for a wheelchair user and a walking person to pass. Where two-way wheelchair traffic is expected, 1800mm is recommended.

Do wheelchair ramps need handrails?

Yes, ramps with a rise greater than 300mm require handrails on both sides at a height of 900-1100mm. Handrails must extend at least 300mm beyond the top and bottom of each flight. They should be 40-50mm in diameter, have a smooth finish, and be fixed with at least 50mm clearance from any wall.

Can I use a temporary ramp instead of a permanent one?

Temporary or portable ramps can be used for existing buildings where a permanent ramp is not feasible. They must still meet a maximum gradient of 1:12 and be stable, slip-resistant, and have raised edges. However, for new buildings, Part M requires permanent ramped access. Temporary ramps are not considered compliant for Building Regulations approval on new-build projects.

Wheelchair Ramp Calculator — Free Trade Calculator

How We Calculate This

This calculator determines wheelchair ramp dimensions based on UK Building Regulations Approved Document M (Access to and use of buildings) and BS 8300:2018 (Design of an accessible and inclusive built environment).

Gradient calculation

The ramp going (horizontal length) is calculated as: Going = Rise x Gradient Ratio. For example, a 600mm rise at 1:15 gradient requires a 9000mm (9m) going.

Landing requirements

BS 8300 limits each flight of ramp to a maximum 500mm rise. Intermediate landings of at least 1200mm length are required between flights. Top and bottom landings must be at least 1200mm x 1500mm, clear of any door swing.

Handrail requirements

Height: 900-1100mm from the ramp surface
Diameter: 40-50mm circular cross-section
Extension: 300mm beyond top and bottom of each flight
Clearance: 50mm minimum from any wall or obstruction

Always consult with your local Building Control body and refer to the latest edition of Approved Document M for specific project requirements.

Frequently Asked Questions

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Last updated: March 2026

All calculations are estimates. Verify with your supplier.

Wheelchair Ramp Calculator - Part M & BS 8300 Gradient & Length