Ramp types, costs and gradient requirements
Wheelchair ramp options range from temporary channel ramps placed over a single step (£200–£500 for aluminium folding ramps — Safepath, Discount Ramps, Harmar) through to permanent structural ramps forming part of the building. Portable modular ramp systems — interlocking non-slip aluminium sections, adjustable to different step heights and configurations — cost £400–£800 for a single-step rise and £800–£2,000 for multi-step risers up to 600mm total height. These are reversible and require no planning permission or Building Regulations approval. Permanent timber-framed ramps — pressure-treated C24 joists on concrete pad foundations, non-slip composite decking surface, powder-coated steel handrails both sides — cost £1,500–£3,500 for a front door threshold installation. Permanent concrete ramps — mass concrete with anti-slip aggregate surface or brick-faced sides — cost £2,500–£6,000 including handrails and any brick piers at threshold. Building Regulations Part M guidance for residential accessibility adaptations recommends 1:12 gradient (1m rise for every 12m run) as the comfortable self-propelled wheelchair gradient, with 1:20 preferred for powered wheelchairs. A 150mm step (typical London Victorian terrace) requires 1.8m of ramp run at 1:12 — this fits within a standard front garden if planned at an angle or alongside the path. Clear width minimum 1,000mm between handrails is required for wheelchair access. Handrail height: 900mm above ramp surface, continuous, returned at top and bottom. Non-slip surface (resin-bound aggregate, grooved concrete, or aluminium chequer plate) is mandatory. The ramp material should match or complement the property — in conservation areas, London Planning Authorities may require natural stone or brick-faced ramps rather than exposed concrete.
Planning permission, DFG funding and conservation areas
A permanent wheelchair ramp within the curtilage of a dwelling is typically Class E Permitted Development — it does not require planning permission unless the property is in a conservation area or is a listed building, or the ramp exceeds 1m in height. In conservation areas (covering approximately 30% of inner London residential areas), any hard external structure associated with the principal elevation may require planning permission. However, most London Local Planning Authorities apply a permissive approach to disability access works and will grant planning permission for sympathetically designed ramps — prior application advice is recommended to confirm the design approach before committing to costs. Listed Buildings require Listed Building Consent for any external ramp, regardless of size — this adds 8–12 weeks to the process. Disabled Facilities Grant funding: a permanent ramp where an OT assessment confirms it is the appropriate intervention is fundable under DFG. Ramp installation costs typically fall well within the DFG cap, so grant funding is straightforward. The local authority arranges contractor quotes; typical grant-funded ramp installations cost £1,200–£3,500 through DFG procurement. For conservation area properties, the local authority housing adaptations team coordinates with the planning department to ensure the design meets both accessibility and heritage requirements before tendering.
