Question 1

What does a rear kitchen extension typically cost on a terrace in Sutton town or Carshalton (SM1, SM2, SM5)?

Accepted Answer

A single-storey rear extension on a standard SM1, SM2 or SM5 terrace — structural opening with steel, flat or pitched roof, lantern or rooflights, screed floor and a fitted kitchen — generally runs between £42,000 and £72,000. Garden depth and the width of the new opening are the two biggest variables. Most SM1 and SM2 addresses qualify under permitted development, so no planning application is needed; SM5 properties inside the Carshalton conservation zone require a full planning submission. All cost lines are itemised separately so you see exactly where the budget goes before any contract is signed.

Question 2

Do Carshalton SM5 conservation area rules mean I need planning permission for an external alteration?

Accepted Answer

Properties within the designated Carshalton Village conservation area — principally the streets around the historic ponds and the upper High Street — cannot rely on household permitted development for changes to rear elevations, rooflines or windows. A full planning application to the London Borough of Sutton is required instead. The boundary is compact; many SM5 addresses in neighbouring streets fall outside it and proceed on standard permitted-development terms. PrimeCraft Surface Solutions checks Sutton Council's published planning maps at the survey appointment and confirms exactly which consent route applies before any build figure is discussed.

Question 3

How does a hip-to-gable loft conversion work on the Edwardian semis around Cheam SM3 and Wallington SM6?

Accepted Answer

Edwardian semi-detached houses in SM3 Cheam and SM6 Wallington share a typical roof geometry — a triangular hip at each end, a generous pitch, and a party wall at the flank. Converting the hip to a vertical gable and adding a rear dormer unlocks a full-width upper-floor room with standing height across most of its length. Structurally this involves a ridge-to-gable steel beam, a new party wall flank and the dormer frame, all of which trigger Party Wall Act obligations to the adjoining owner. We prepare and serve the required notices and coordinate with any surveyor the neighbour appoints. Steels, insulation, stair, joinery and fit-out are each quoted as individual line items.

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