Question 1

What does a side extension typically cost on a 1930s semi in DA5, DA6 or DA14?

Accepted Answer

A single-storey side extension on the interwar semis typical of DA5, DA6 and DA14 generally costs between £30,000 and £55,000, depending on the width of the passageway being enclosed, the roof detail and whether a WC or utility room is incorporated. Running both a side infill and a rear addition together — so the whole ground floor opens into one kitchen-dining space — pushes the budget to roughly £58,000–£88,000 but delivers a step-change in how the house functions. PrimeCraft produces a detailed line-by-line cost schedule at the site visit so the numbers are confirmed before any design work is commissioned.

Question 2

Do 1930s semis in Bexley need planning permission for rear extensions or dormer loft conversions?

Accepted Answer

Single-storey rear extensions up to three metres deep on semi-detached houses — the stock type that covers most of DA7, DA14 and DA15 — typically qualify as permitted development, requiring only a lawful development certificate rather than a full planning application. The Householder Prior Approval route can extend the permitted depth beyond that limit. Rear-facing dormer conversions are generally also permitted-development compliant, but hip-to-gable alterations on corner plots require individual review. Article 4 designations vary by street across Bexley; PrimeCraft checks your address's exact planning position at every site visit before any scheme is committed to paper.

Question 3

How does the Party Wall etc. Act 1996 apply to renovation work on Bexley's semi-detached pairs?

Accepted Answer

Semi-detached pairs across DA5, DA6, DA7, DA14 and DA15 share a single party wall between each joined pair. A rear extension along that wall, or loft steelwork bearing on the shared structure, creates a statutory duty to serve written notice on the neighbour before work starts — the notice period is one to two months depending on the works. If the neighbour appoints a surveyor, a formal party-wall award must be settled before construction begins. PrimeCraft manages all notices and surveyor coordination as part of the build scope.

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