Retaining wall costs vary significantly depending on height, length, ground conditions, and wall type. A simple 1m-high block retaining wall might cost £150-£300 per linear metre. Reinforced concrete walls over 2m high can cost £500-£1,000+ per linear metre including design fees. We provide detailed quotes after assessing the site and reviewing any engineer's drawings.

It depends on the scope. Retaining walls over 1m high adjacent to a highway, or over 2m high elsewhere, typically need planning permission. New drainage connections to public sewers need approval from South West Water. Road construction and highway works require Section 278 or Section 38 agreements. We advise on the permissions needed during the quoting stage.

Retaining walls over 1.2m high generally need structural engineer involvement to confirm the design. Walls over 2m high need planning permission in most cases. Near highways, the threshold drops to 1m. In Cornwall, ground conditions (particularly clay and mining-affected land) can affect what is structurally feasible. We work with structural engineers to ensure every wall is designed for the actual site conditions.

Retaining walls are not specifically covered by building regulations in the way houses are. However, any retaining wall that supports a building, forms part of a boundary near a highway, or exceeds 2m in height should have structural engineer involvement. Building control may want to inspect retaining walls that affect the structural integrity of adjacent buildings. We coordinate with building control and engineers as part of the project.