House Extension Drawings in Hammersmith and Fulham

Most standard extensions in Hammersmith and Fulham fall under Permitted Development — single-storey rear up to 3m (attached) or 4m (detached), side returns up to half the width of the house. However, Hammersmith and Fulham has Article 4 Directions that may remove these rights in specific streets, and flats, listed buildings and conservation areas always need full planning. We check PD eligibility before quoting.

Standard permitted development allows single-storey rear extensions up to 3m (attached house) or 4m (detached) in Hammersmith and Fulham. Larger extensions up to 6m/8m are allowed under Prior Approval (Class AA). Flats, listed buildings and Article 4 areas in Hammersmith and Fulham are excluded from these PD rights.

Our fixed-fee architectural package starts at £1,225 for a Hammersmith and Fulham extension (planning + building regs + structural). Typical Hammersmith and Fulham build costs are £2,400–£3,500 per square metre including VAT — so a 25m² side return extension is £60,000–£87,500 to construct.

Hammersmith and Fulham does not have a borough-specific basement policy beyond the national framework — basement conversions are generally permissible subject to structural, drainage and flood-risk considerations. Thames Water Build Over Agreements apply where you're within 3m of a public sewer.

Most Victorian terraces in Hammersmith and Fulham (particularly in Hammersmith Grove) benefit from both — a side return extension infills the narrow side passage to create a wider kitchen, a rear extension projects back into the garden. A wraparound combines the two. We recommend the best option at the free site visit.