GS Renovation converts lofts in Uxbridge, where UB8 mixes interwar semis with much newer estate housing. The two behave completely differently in the roof, and some modern houses simply do not have the height to convert. We measure before we quote, coordinate the structural engineer and manage Hillingdon Council building control through to sign-off.
When a modern Uxbridge roof will not convert
Post-war and modern estate houses were built with shallow pitched, prefabricated trussed roofs designed for economy, not for future rooms. Two problems follow. The ridge is often well under the roughly 2.2m to 2.4m you need above the existing ceiling joists, and the diagonal truss webs cannot be cut until a replacement structure carries the loads. Where the height is not there, the honest answer is that a conversion needs the roof raised, which is a planning application and a very different budget.
The interwar semis around Uxbridge are more promising. Their roofs were cut on site with rafters, purlins and struts, leaving an open void with usable height. Hip to gable plus a rear dormer is the usual scheme, at roughly £55,000 to £80,000 on indicative London ranges for 2026. We take the ridge measurement and inspect the roof structure at the first visit, so the quotation reflects your actual house.
Planning and building regulations in UB8
Semi-detached and detached houses are commonly cited as having a 50 cubic metre permitted development volume allowance, with the standard conditions on matching materials, obscure glazed side windows, no verandas or balconies and nothing forward of the existing roof plane. Hillingdon Council conservation areas, including around the older core of Uxbridge and the Grand Union Canal, remove those rights. Raising a roof is never permitted development and always needs an application.
Whatever the planning route, Hillingdon building control has to approve and inspect the work. That covers the engineer-designed steel beams and their bearings, the new floor joists sitting clear of the ceiling below, the protected stair route with fire doors and interlinked alarms, the stair rise, going and headroom, and the insulation and ventilation. We build to the approved design and hand over the completion certificate at the end.
- New floor joists independent of the existing ceiling
- Hip to gable conversions on semi-detached and end terrace roofs
- Trussed roofs redesigned before any web is cut
- Staircase design to Part K, including the landing below
- Building control inspections booked at floor, steel and completion
The GS Renovation Difference in Uxbridge
Uxbridge homeowners choose GS Renovation because we will tell you if your roof does not have the height, rather than sell you a survey and a disappointment. Where it does, one team coordinates the engineer, installs the steelwork, prepares your party wall notices and runs Hillingdon Council building control. Fully insured, with a dedicated project manager on every job and free quotations.
- Party Wall notices prepared for steels bearing into a shared wall
- Waste cleared as we go, not left piled in the garden
- Photographs kept at each stage for your records
- Straight advice on what is and is not worth spending money on
- Our own trades on site rather than a chain of subcontractors
- Staircase set out to Part K within the space you have