Dormer, hip to gable and mansard loft conversions in Becontree. Trusted, professional, 30+ years' hands-on experience.
GS Renovation converts lofts across Becontree, on the interwar semis and estate houses that make up most of RM8. A roof that hips in at the side leaves very little standing height, so hip to gable is usually the starting point here. We handle the steels, the new staircase and Barking and Dagenham Council building control.

The Becontree Estate houses and the 1930s semis around them were built with hipped roofs that slope inwards at the side as well as front and back. That removes exactly the head height you need at the top of a new staircase. Squaring the hip off into a vertical gable wall recovers it, and pairing the new gable with a rear dormer produces a full-width room with standing height across most of the floor plate.
Measure the ridge before anything else. Around 2.2m to 2.4m from the top of the existing ceiling joists to the underside of the ridge is what allows a conversion without dropping the bedroom ceilings beneath. Interwar roofs in RM8 were commonly cut with purlins and struts rather than modern trussed rafters, which helps, because those timbers can be reworked around a new floor structure instead of the roof being rebuilt from scratch.
Volume matters more than floor area under permitted development. The allowances usually cited are 40 cubic metres for a terraced house and 50 for a semi-detached or detached one, and a hip to gable plus rear dormer on a semi can consume that quickly, so the calculation has to be done properly before materials are ordered. Article 4 directions and conservation area designation remove those rights entirely, so we confirm the position with Barking and Dagenham Council rather than assume it.
Plenty of Becontree houses were bought from the council and carry covenants or title restrictions that sit outside the planning system altogether, so bring your solicitor's paperwork to the survey. Building regulations then govern the new floor structure, the protected stair to a final exit, insulation and ventilation, and we book inspections at the stages the building control surveyor needs to see rather than leaving them to the end.
Becontree owners come to us because we treat the roof as a structure to be re-engineered, not a space to be boarded out. We coordinate the engineer's design for the gable, steels and floor, build a compliant staircase, prepare your party wall notices where a semi shares a wall, and carry the job through Barking and Dagenham Council building control. Fully insured, with free no-obligation quotations.
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…
My husband and I are extremely pleased with the work. The standard of the work is outstanding and Saiid has a great eye for detail and will not leave a job half-done. He went out of his way to help us select the products that were the best…
Giorgio is an excellent and intelligent workman, and with very reasonable prices! He installed a kitchen extractor fan in a complicated situation, including making a hole through the wall and installing the exhaust completely from the…
FAQ
We do not price loft conversion over the phone for Becontree homes. A figure given blind is a figure that changes, so we survey the RM8 address, then quote in writing for Becontree. 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.
Lead time varies with the season and how booked we are. Ring us and we will say honestly when loft conversion could begin at your RM8 address rather than promise a Becontree date we cannot hold.
GS Renovation is a contractor, not a middleman, so loft conversion is delivered by one accountable team rather than a chain of subcontractors, whether the job is in Becontree or over in Chadwell Heath.
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 RM8 property first, because if the ridge is too low no amount of design fixes it.
Yes. Original features in a RM8 property are usually worth keeping, and loft conversion can be planned around them rather than through them. We agree that with you before starting in Becontree.
As an indicative London range for 2026, a hip to gable combined with a rear dormer runs roughly £55,000 to £80,000, with an en suite adding around £8,000 to £15,000 on top. A simple rooflight conversion, which adds no volume, sits closer to £30,000 to £45,000. The variables in RM8 are the ridge height, the heating and drainage changes, and whether an old water tank has to come out.
We do loft conversion throughout Becontree and the RM8 area. If you are unsure whether your street counts, 07472 424 226 is the fastest way to find out, and nothing is owed for asking about a RM8 address.
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 Becontree. Explore what else we do locally:
Same Service, Nearby Areas
We carry out loft conversion across Becontree and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for loft conversion in Becontree. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.