Dormer, hip to gable and mansard loft conversions in Havering. Trusted, professional, 30+ years' hands-on experience.
GS Renovation builds loft conversions across the London Borough of Havering, from the interwar semis around Raphael Park to the wider streets of Hornchurch and Upminster. Hipped roofs on generous plots make hip to gable with a rear dormer the workhorse here. We build to the engineer's design under Havering Council building control.

Havering's suburban semis were built with hips on the flank and often a chimney stack partway along, so the usable width of the raw loft is a good deal less than the footprint suggests. Squaring the hip into a vertical gable recovers that width, and a dormer across the rear slope adds the flat ceiling area that makes a bedroom feel like a bedroom rather than an attic. Plots in RM11, RM12 and RM14 are usually wide enough that the new gable does not crowd the boundary.
The newer estate housing scattered through the borough is a different proposition. Trussed rafter roofs, which most later houses have, cannot simply be cleared out: the trusses hold the roof together and must be replaced with a structural frame designed by the engineer, and shallow pitches often mean there is nowhere near the 2.2m to 2.4m needed in the first place. We measure before we quote, and we will tell you when a house is not worth converting.
A semi-detached or detached house has the larger commonly cited permitted development allowance of 50 cubic metres of added volume, and many Havering conversions fit inside it, subject to the standard conditions on matching materials, building nothing forward of the existing roof plane, no balconies and obscure-glazed side windows. Those rights are removed in conservation areas, including those covering the older village centres, on listed buildings, and under any Article 4 direction, so the address is checked with Havering Council first.
Building regulations apply in every case. Havering building control wants Part B satisfied with a protected stair route to a final exit, fire doors and interlinked alarms, Part K met on the new stair, and the new floor built on engineer-sized joists carried by steel rather than on the old ceiling joists. Where the work bears into or is built off the wall you share with next door, the Party Wall etc. Act 1996 applies and you as building owner serve the notice, with the technical information supplied by us.
Havering homeowners choose GS Renovation because we treat the roof as a structural job: gable, steel, floor, stair and fire strategy in the right order, with Havering Council building control booked at the right stages. Founder Abdelaaziz Saaid brings 30+ years of hands-on experience. Fully insured, free no-obligation quotations, and one project manager on your job.
What can I say!!! George is an extremely lovely man his workmanship is second to none, he has an excellent eye for detail and nothing was to much trouble. George it was a pleasure having you in our home! thank you for all your hard work…
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…
Punctual, worked hard, and did exactly what he was asked and what he said he would do. Overall, a very high quality job. Will use again.
FAQ
Comparing loft conversion quotes is only useful when they cover the same work. GS Renovation itemises, so a Havering homeowner can line our RM1 figure up against another and see exactly where the difference sits. 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 start loft conversion when we can finish it. Opening a house and disappearing to another job is the commonest complaint about builders, and it is not how a RM1 project in Havering is run.
Quotes are free and carry no obligation. If the loft conversion figure does not work for you there is no follow-up pressure, and the RM1 survey costs a Havering homeowner nothing either way.
Often, but the form is constrained. Permitted development rights are withdrawn, so a full application to Havering Council is needed, and a rear dormer that would pass unremarked elsewhere in Havering may be refused. A mansard behind a retained parapet, finished to match, is frequently what gets approved. Listed buildings need listed building consent as well.
Yes, and honestly they are the more interesting jobs. loft conversion throws up variation a modern estate does not, so we survey the RM1 property in Havering thoroughly first.
No, and it is worth knowing early. Older semis and detached houses with traditionally cut roofs usually have the 2.2m to 2.4m of ridge height needed. Later estate houses with trussed rafters and shallow pitches often do not, and restructuring them is expensive. We measure the height, look at how the roof is built and tell you plainly whether the house is a candidate before you spend anything.
Havering sits inside our normal working area, and we are usually on another Havering site nearby. That often means a RM1 survey for loft conversion can happen quickly.
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 Havering. Explore what else we do locally:
Same Service, Nearby Areas
We carry out loft conversion across Havering and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for loft conversion in Havering. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.