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

Structural Wall Removal

from £6,500

Structural wall removal for Poole homeowners: survey, structural calculations, Building Control, RSJ installation and making good handled as one route.

RSJ Installation

from £6,500

RSJ and steel beam installation for Poole structural openings, kitchen knock-throughs and wall removals with engineer and Building Control support.

Kitchen Knock-Through

from £9,000

Kitchen knock-throughs and open-plan kitchen structural alterations in Poole, including wall removal, RSJs, Building Control and making good.

Single-Storey Extension Builder

priced after fit check

Single-storey extension builder in Poole for rear extensions, kitchen extensions and controlled watertight shell projects with design, approvals and build route joined up.

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.