Dormer, hip to gable and mansard loft conversions in Forest Gate. Trusted, professional, 30+ years' hands-on experience.
GS Renovation builds loft conversions in Forest Gate, on the period terraces filling E7 between West Ham Park and the Queen Elizabeth Olympic Park. Families here tend to want a fourth bedroom without moving, and a rear dormer or L-shaped dormer usually delivers it. We coordinate the structural engineer and take Newham Council building control through to sign-off.

Start with a tape measure, not a mood board. From the top of the existing ceiling joists to the underside of the ridge you want roughly 2.2m to 2.4m, because the finished floor sits above the old ceiling and the insulation eats into the height at the rafters. Where the number is there, the main rear slope carries a dormer comfortably. Where the house keeps its rear closet wing, wrapping the dormer into an L shape is what buys you a separate en suite.
The staircase decides how good the finished loft feels. Part K sets the maximum rise, the minimum going and the headroom over the flight, and a space-saver stair with alternating treads is only permitted where it serves a single room. In a narrow E7 terrace that usually means taking the new flight up over the existing one and losing a slice of the rear bedroom, which is far better planned at survey stage than argued about halfway through.
Newham Council designates conservation areas in and around Forest Gate, and inside them permitted development rights for loft conversions are removed, which means a full planning application and a dormer design that a conservation officer will accept. Outside them, the commonly cited terraced allowance is 40 cubic metres of added volume with the usual conditions on materials, side windows and the roof plane. We establish which applies to your address before any drawings are commissioned.
A mid-terrace loft in E7 sits between two party walls, and the steel beams carrying the new floor and dormer will bear into both. That makes the work notifiable under the Party Wall etc. Act 1996, and the legal duty to serve notice falls on you as the building owner rather than on us. We prepare the structural information and drawings so your surveyor can issue notices early, which keeps the programme predictable once we are on site.
Forest Gate homeowners choose GS Renovation because we plan the stair, the head height and the fire route before we quote, so what you sign is what gets built. One team coordinates the engineer, installs the steelwork, prepares party wall paperwork, manages Newham building control and finishes the bedroom and bathroom. Fully insured, 4.9 from 31 MyBuilder reviews, 30+ years of hands-on experience behind the founder.
Saiid did a complete refurbishment of our small bathroom. This involved ripping out the existing bath/shower, basin, toilet, pipework, and tiles and replacing with new. Saiid was very helpful during the planning stage giving useful advice…
Very friendly and I am very pleased with the work he has done, also very clean worker and enthusiastic about his work. Can not fault this company!!!! Very very good for the money.
He was very very good. He just got on with the job and we was beey pleased with the result. He Also cleaned everything away when he finished. Will deffinatly hire him again.
FAQ
Scope drives the price of loft conversion far more than the address does. GS Renovation prices each element separately, so a change of specification partway through a Forest Gate job shows its cost immediately at the E7 site. As a rough guide, loft conversion in London runs roughly £30,000 to £45,000 for a rooflight scheme, £45,000 to £65,000 for a rear dormer, £55,000 to £80,000 for an L-shaped dormer or a hip to gable with a dormer, and £70,000 to £100,000 or more for a mansard; an en suite adds roughly £8,000 to £15,000 (indicative London ranges, MyBuilder and Checkatrade, 2026). Your figure depends on the size, specification and condition of the property, which is why we survey before quoting.
We book loft conversion a few weeks ahead in normal conditions. Getting the E7 survey done early means the Forest Gate project is scheduled properly rather than squeezed into a gap.
You get a straight answer about loft conversion, including what it will not achieve at your E7 property. Overselling a Forest Gate job is how you end up in a dispute at the end of it.
No, and head height decides it before anything else. Roughly 2.2 to 2.4 metres from the top of the existing ceiling joists to the underside of the ridge is what allows a conversion without lowering the ceilings below. We measure that at the E7 property first, because if the ridge is too low no amount of design fixes it.
We do, and we would rather tell you early if loft conversion is difficult at your particular E7 property than find out on site. The Forest Gate survey is free either way.
As indicative London ranges for 2026, a rooflight conversion runs roughly £30,000 to £45,000, a rear dormer roughly £45,000 to £65,000 and an L-shaped dormer over the closet wing roughly £55,000 to £80,000. Adding an en suite typically costs a further £8,000 to £15,000. The variables in E7 are ridge height, whether the roof structure is trussed, the stair position and how much of the heating system has to change.
We take loft conversion enquiries from anywhere in Forest Gate and much of East London. If we are not right for your E7 property we will say so rather than quote and hope.
Every Service, One Team
The same trusted team, 30+ years' hands-on experience and free, no-obligation quotes apply to every GS Renovation service in Forest Gate. Explore what else we do locally:
Same Service, Nearby Areas
We carry out loft conversion across Forest Gate and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for loft conversion in Forest Gate. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.