GS Renovation converts lofts across Southall, on the interwar semis and family houses that fill UB1. Many have already been extended at the rear or side, which affects both the design and the permitted development calculation. We survey what is already there, coordinate the structural engineer and run the job through Ealing Council building control.
Adding bedrooms to a UB1 family house
Southall houses often work hard for larger households, and a loft is the cheapest way to add bedrooms without losing garden. On a semi with a hipped roof that normally means squaring the hip into a gable and adding a rear dormer, which gives a full-width room with standing height. Where the ridge is generous the same roof can take a bedroom and a shower room, with an en suite adding an indicative £8,000 to £15,000 for London in 2026.
Ridge height sets the ceiling on all of it. We measure from the top of the existing ceiling joists to the underside of the ridge and look for roughly 2.2m to 2.4m. Interwar roofs in UB1 usually have it, but past alterations, a re-covered roof in heavier tiles or a sagging ceiling structure can change the picture, and the engineer's design has to reflect the roof you actually have rather than the one on the original drawings.
How earlier extensions affect the loft
This is the point most people miss. Permitted development for a loft works on volume, commonly cited as 40 cubic metres for a terraced house and 50 for a semi or detached one, and any earlier roof enlargement counts against that allowance. If a previous owner added a rear dormer or extended over a side addition, less volume remains, and a scheme that would have been permitted on an untouched house may need a planning application to Ealing Council instead.
We look at the planning history and measure what has already been built before advising on the route. Building regulations then apply in every case: engineer-sized floor joists carried on steel beams and padstones, a protected stair route to a final exit with fire doors and interlinked alarms, stair rise, going and headroom to Part K, and insulation and ventilation signed off by Ealing Council building control.
- Water tank removal and conversion to a sealed system
- L-shaped dormers over a rear closet wing
- En suite plumbing, drainage and mechanical extraction
- Dormer cheeks, flat roof and leadwork detailed to last
- Ventilation paths kept clear at eaves and ridge
Why Choose GS Renovation in Southall
Southall homeowners choose GS Renovation because we check what has already been built before promising anything, then deliver the structural work ourselves. Engineer coordination, gable and dormer construction, steels on padstones, the new floor, a compliant staircase, fire separation and Ealing Council building control sit with one team. Every stage inspected and certified, and the file handed to you at completion.
- Photographs kept at each stage for your records
- Roof made good, leadwork and guttering finished properly
- Party Wall notices prepared for steels bearing into a shared wall
- One point of contact on the phone, not a call centre
- Straight advice on what is and is not worth spending money on
- Interlinked mains alarms fitted and certified