GS Renovation converts lofts across Bexleyheath, where 1930s semi-detached houses on generous plots make up most of the stock around Danson Park. In DA6 the hipped roof is both the obstacle and the opportunity. We square it off, build the dormer, and take the job through Bexley Council building control from steelwork to sign-off.
Hip to gable conversions in DA6
A 1930s Bexleyheath semi has a hipped roof that slopes in on the side as well as the back, which strangles the usable floor area at exactly the point where you want a bed to go. Building the hip up into a vertical gable end recovers that width, and pairing it with a rear dormer gives you a full width room with headroom over the stair. On a semi you can normally only do this on the outer slope, so the layout is planned around the gable side.
Structurally this is real work. Steel beams span between the party wall and the new gable to carry the new floor and the dormer above, sized by the engineer and bearing on padstones, with new floor joists sitting clear of the old ceiling joists. Old cold water tanks come out at the same time, usually with a switch to a combi or an unvented cylinder. Indicative London ranges for 2026 put hip to gable with a rear dormer at roughly £55,000 to £80,000.
Permitted development and Bexley Council
The generous plots around Bexleyheath work in your favour on volume. Semi-detached and detached houses are commonly allowed 50 cubic metres of added roof volume under permitted development, against 40 for a terrace, and a hip to gable plus rear dormer on a 1930s semi will often sit inside that. The conditions still bite: nothing may extend forward of the roof plane facing the highway, materials must match, and any side facing window has to be obscure glazed and non-opening below 1.7m.
Even where planning is not needed, building regulations always are. Bexley Council building control will want a protected stair route with fire doors and interlinked alarms under Part B, a stair that meets Part K on rise, going and headroom, an engineer-designed floor structure, and insulation and ventilation to Part L. We book the inspections at the stages the surveyor needs to see and hand you the completion certificate at the end.
- Trussed roofs redesigned before any web is cut
- Building control inspections booked at floor, steel and completion
- Staircase design to Part K, including the landing below
- Structural steel sized by the engineer and set on padstones
- Insulation between and over rafters to Part L
The GS Renovation Difference in Bexleyheath
Bexleyheath families choose GS Renovation because a hip to gable is structural work first and a bedroom second. We coordinate the engineer, install the steels and the new floor, build the gable and dormer weathertight quickly, and finish the room, stair and en suite to a standard that passes Bexley Council building control. Fully insured, with a dedicated project manager on every job.
- Honest answer at survey if your roof will not take a conversion
- Honest updates if a date or a detail has to move
- Building control applications and inspections coordinated for you
- A written scope and programme agreed before work starts
- Fully insured, with cover in place on every site
- Roof made good, leadwork and guttering finished properly