GS Renovation builds loft conversions in Welling, where interwar terraces and semis sit between Danson Park and Bexleyheath. DA16 roofs are usually high enough to convert, and the form depends on whether your house is hipped or gabled. We coordinate the engineer, build the structure and carry Bexley Council building control through to completion.
Hipped or gabled, and what each gives you in DA16
Welling has both. A hipped roof, common on the semis and end terraces, wastes width along the side, so building the hip up into a gable before adding a rear dormer is what produces a full width room. A mid terrace with a gable at each end already has that width, so a rear box dormer on its own does the job and costs less. Which one you have is obvious from the street once you know what to look for.
Indicative London ranges for 2026 put a rear dormer at roughly £45,000 to £65,000 and hip to gable with a rear dormer at roughly £55,000 to £80,000, with an en suite adding £8,000 to £15,000. Interwar houses also tend to hide a cold water tank exactly where the new bedroom needs to go, so tank removal and a switch to a combi or unvented cylinder is priced in from the start.
Bexley Council, volumes and the wall next door
The permitted development volume allowance depends on the house type: 50 cubic metres for a semi-detached or detached property and 40 for a terrace, with the standard conditions on materials, side windows and not extending forward of the roof plane. Article 4 directions and conservation areas remove those rights, and previous extensions reduce what is left of the allowance, so we check both with Bexley Council before design work starts.
On a terrace or a semi, the steels carrying the new floor bear into the wall you share with your neighbour, which makes the work notifiable under the Party Wall etc. Act 1996. The duty to serve notice is the building owner's, not ours, so you serve it and we supply the technical information. We then programme the scaffold and the roof opening around the notice period so nothing stalls halfway.
- Rear dormers to win full head height across the new floor
- Dormer cheeks, flat roof and leadwork detailed to last
- Rooflight conversions where the roof line must not change
- Ventilation paths kept clear at eaves and ridge
- Staircase design to Part K, including the landing below
Trusted Loft Conversion in Welling
Welling homeowners choose GS Renovation because we identify the right form for the roof you actually have and then build all of it. Engineer coordination, steels, gable, dormer, tank removal, stair, insulation and decoration from one team, with Bexley Council building control carried to a completion certificate. Fully insured, building control compliant, rated 4.9 from 31 MyBuilder reviews.
- New floor structure carried on steel, never on the old ceiling joists
- Ridge height measured before any design work is commissioned
- Party Wall notices prepared for steels bearing into a shared wall
- One point of contact on the phone, not a call centre
- Building control applications and inspections coordinated for you
- Fully insured, with cover in place on every site