What does a typical extension cost in Westham?

Weymouth area build costs are at or slightly below the Dorset average. A single storey rear extension on a Westham semi typically costs £45,000–£65,000. Labour availability can be better than in the more competitive Bournemouth/Poole area.

Is Westham affected by any planning designations?

No. Westham is outside the Weymouth conservation area and is not in an AONB. Standard PD rules apply. Most extension projects here are straightforward from a planning perspective.

Extension Plans in Westham, Weymouth

Westham is a residential area west of Weymouth town centre, offering family homes at more moderate prices than the seafront. The area is popular with families extending their homes to create more living space without the premium of coastal properties.

Property mix in Westham

1950s–1970s semi-detached houses and terraces, with some newer developments. Properties typically have moderate-sized gardens. The area is outside the conservation area, so full PD rights apply to most properties.

Our services in Weymouth

3D Laser Survey

£650

A 1.5-hour on-site visit with a 3D laser scanner to capture millimetre-accurate measurements of your property. The foundation for precise structural calculations and planning drawings.

Structural Calculations

£350

Engineer-certified structural calculations for your extension or wall removal. Covers beam sizing, foundation design, and Building Regulations compliance.

Planning Application

£2,200

Full householder planning application preparation and submission. We handle the drawings, design and access statement, and council liaison from start to finish.

Building Regulations Drawings

£399

Technical construction detail drawings that satisfy Building Regulations. Covers insulation, drainage, structural details, and everything your builder and building control need.

Builder Introduction

£149

We match you with 2–3 vetted local builders who specialise in your type of project. Includes a professional brief so every builder quotes on the same scope.

Certificate of Lawfulness

£1,500

A legal document confirming your extension falls within Permitted Development rights. Protects you at resale — mortgage lenders and solicitors expect it.