Dormer, hip to gable and mansard loft conversions in Enfield. Trusted, professional, 30+ years' hands-on experience.
GS Renovation builds loft conversions across Enfield, covering the interwar semis of EN1, EN2 and EN3 and the suburban streets of N13, N14 and N21 out towards Trent Park. Roof shape varies widely across the borough, so the survey decides the type of conversion, not the sales visit, and the hipped 1930s roof is the most common starting point.

Enfield has three broad house types and each takes a different loft. The 1930s semis and detached houses that dominate EN1 and EN3 usually have hipped roofs, so hip to gable plus a rear dormer is the standard answer and gives the most floor for the money. The Victorian and Edwardian terraces closer to Enfield Town and in N9 tend to have a rear closet wing, where an L-shaped dormer works better. The substantial detached houses around N14 and N21 sometimes have height for a rooflight conversion alone.
Ridge height is the deciding measurement in all three cases. Around 2.2m to 2.4m from the existing ceiling to the ridge gives room for the new floor build-up, insulation, a finished ceiling and a stair that meets Part K. Interwar roofs here are generally purlin framed and straightforward to work with; a few later houses have trussed rafters, which have to be restructured entirely and add cost, so we identify the roof type on the first visit.
For a house, the permitted development allowance is commonly cited as 50 cubic metres on a semi-detached or detached property and 40 on a terrace, with conditions: nothing forward of the existing roof plane, materials to match, obscure glazing to side windows and no balcony. Enfield Council has conservation areas across the borough, including around Forty Hall and the older village centres, and permitted development is withdrawn in them and by any Article 4 direction covering your street.
We recommend a lawful development certificate where a scheme proceeds under permitted development, because it is the document a buyer's solicitor will ask for later. Building control approval is separate and always required, covering fire safety, stair geometry, structure, insulation and ventilation. On a semi, the new steels bear into the wall shared with your neighbour, which makes the work notifiable under the Party Wall etc. Act 1996. We prepare the notices; as building owner you serve them.
Enfield covers a lot of ground and a lot of roof shapes, so GS Renovation starts with a survey rather than a standard package. One team then handles the engineer, the steel, the dormer, the party wall notices and Enfield Council building control. Fully insured, dedicated project manager, free no-obligation quotations, 4.9 from 31 MyBuilder reviews.
The kitchen has been fitted to the high standard. Saaid was polite, professional, tidy, he pays attention to a little details that make huge difference on terms of the harmony of all kitchen elements. We are so happy to find such a good…
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…
Really happy with the quality of remedial works carried out by George in putting other previous tradesman work right. He was very helpful, honest and advised me on certain things. So happy that i am also getting him to quote for my…
FAQ
We do not price loft conversion over the phone for Enfield homes. A figure given blind is a figure that changes, so we survey the EN1 address, then quote in writing for Enfield. 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 EN1 address rather than promise a Enfield date we cannot hold.
Homeowners choose us for loft conversion because the process is clear from the first survey: an itemised quotation, a written programme for the EN1 property, and one person to call throughout the Enfield job.
In most cases the question is not permission but which route applies. A rear dormer on a Enfield house often proceeds under permitted development, while anything altering the front roof plane usually needs a full application to Enfield Council. Conservation area status or an Article 4 direction removes those rights entirely, so we confirm the position for your EN1 property first.
Certainly. Properties across Enfield vary more than people expect, so each loft conversion project at EN1 is treated on its own merits rather than by the standard detail from the last job.
If the roof hips in on the side, a hip to gable with a rear dormer usually gives the best result, indicatively £55,000 to £80,000 on 2026 London ranges. If the roof already ends in a gable, a rear dormer alone at roughly £45,000 to £65,000 may be enough. Where the ridge is unusually high, a rooflight conversion adding no volume can work for around £30,000 to £45,000.
We take loft conversion enquiries from anywhere in Enfield and much of North London. If we are not right for your EN1 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 Enfield. Explore what else we do locally:
Same Service, Nearby Areas
We carry out loft conversion across Enfield and the surrounding areas. Explore a nearby location:
Free, no-obligation quote for loft conversion in Enfield. Rated 4.9 from 31 reviews on MyBuilder, fully insured, and building control handled for you.