Question 1

What does a hip-to-gable loft conversion cost on a semi-detached house in Northwood, HA6?

Accepted Answer

Converting the hipped roof of a typical HA6 semi to a usable double bedroom — rebuilding the sloping end as a vertical gable, adding a rear dormer, installing a new staircase, fully insulating and boarding the floor, and carrying out plastering and decoration — generally costs £52,000–£74,000. En-suite additions run £5,000–£9,000 on top, subject to soil-pipe routing. PrimeCraft provides a fully itemised quote on the same day as the site visit, so you have clear numbers before any work is committed.

Question 2

Could properties bordering Ruislip Woods face restrictions on excavation or drainage?

Accepted Answer

Ruislip Woods holds SSSI designation, meaning rear gardens that adjoin the woodland boundary can attract Natural England review over excavation depth and surface drainage. In practice, most standard residential extensions set back from that boundary proceed without difficulty, but it is a variable worth identifying at the design stage rather than mid-build. During our HA6 site surveys, we cross-reference each plot against Hillingdon's Local Plan and ecological mapping, flagging any proximity constraints before the scope is fixed.

Question 3

How large a rear extension is permitted on a detached Northwood Edwardian house under current rules?

Accepted Answer

A detached property in HA6 can typically extend up to 4 metres under standard permitted development or up to 8 metres via the neighbour-consultation scheme — the larger allowance having been made permanent following a government review. For Northwood's Edwardian detacheds, that 8-metre potential produces genuinely expansive kitchen-dining rooms without a full planning application. Side additions are treated differently and usually require consent. Hillingdon's design guidance favours materials and rooflines that respect the original house; we advise on the optimal route during the site visit and manage Building Regulations approval throughout.

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Commonquestions, Northwood.

Let's talk through what you're planning.