Hammersmith and Fulham at a glance
- Postcode districts
- W6, W14, W12, SW6, SW13, W4, SW14
- Council area
- London Borough of Hammersmith and Fulham
- Building approval
- London Borough of Hammersmith and Fulham building control, or a registered building control approver
- Guide price region
- London (+20% on West Midlands rates)
When should a flat roof in Hammersmith and Fulham be replaced?
A sensible moment to replace a flat roof in Hammersmith and Fulham is when other work is planned on the house, such as a kitchen refit below, new windows or a loft conversion. Doing the roof first protects the new work, and it is the natural time to upgrade insulation to the level the regulations expect for a renovated roof.
Hammersmith and Fulham's flat roofs are mostly on mansard and dormer loft conversions, with plenty on Victorian and Edwardian terraces with flat-roofed back additions too. The Thames basin is one of the drier parts of Britain at roughly 730 mm of rain a year, but summer heat is the bigger test here: dark membranes on south-facing roofs swing a long way in temperature.
How much does a flat roof replacement cost in Hammersmith and Fulham?
For Hammersmith and Fulham we use London rates: £3,350–£5,850 is the guide for a 20 m² extension roof in EPDM with a new deck and insulation, VAT included. The fixed price comes after a free survey for new and replacement roofs.
| Job | Guide price inc VAT |
|---|---|
| Extension (20 m²), EPDM, new deck + insulation | £3,350–£5,850 |
| Single garage (18 m²), torch-on felt | £1,800–£3,150 |
| Extension (20 m²), GRP, new deck + insulation | £3,600–£6,450 |
| Single garage (18 m²), EPDM rubber | £1,900–£3,350 |
How long does it take to replace a flat roof?
A garage or single-storey extension roof is usually stripped and re-covered in one to three working days; larger, higher or more detailed roofs take longer. Weather sets the pace, because the deck must be dry before insulation and membrane go down.
We strip only as much as can be made weathertight that day, so the roof is never left open overnight. Expect noise and some vibration during the strip, a skip on the drive (or on the road with a permit) and ladders or a tower against the house. Rooms below stay usable, though it helps to clear shelves near the ceiling. Resin systems such as GRP smell strongly while they cure, so keep nearby windows closed that day. Two-storey roofs need scaffold, which goes up before we start and comes down after sign-off.
What's included?
- New membrane, upstands, edge trims and outlets
- Fixed written quote listing the full build-up
- Strip-out of the old covering, with waste and skip
- Building control handled where needed, plus a written workmanship guarantee
Building regulations in England
Replacing more than half of a flat roof over a heated room usually counts as renovating a thermal element, so the roof is insulated to around 0.16 W/m²K where that's technically and economically feasible, and the work is notified to building control: the council or a registered building control approver, unless a registered competent person self-certifies it. A roof on a new extension is built to 0.15 W/m²K. Patch repairs, and most unheated detached garages, don't trigger the upgrade. Structural changes, or a new covering that adds 15% or more to the roof's weight, also need approval. More on the rules.
Which nearby areas do we also cover?
- Kensington and Chelsea · 1 mi
- Wandsworth · 3 mi
- Westminster · 3 mi
- Ealing · 4 mi
- Camden · 4 mi
- Lambeth · 5 mi
Flat roof replacement in Hammersmith and Fulham: questions
Do you cover Hammersmith and Fulham?
Yes. Hammersmith and Fulham is part of our London coverage, including postcode districts W6, W14, W12, SW6, SW13, W4 and 1 more. Surveys and roofs are carried out by vetted roofing teams working under S&K Property Investments and Improvement Ltd.
Who checks building regulations for a flat roof in Hammersmith and Fulham?
Where the work needs approval it goes to London Borough of Hammersmith and Fulham building control, or a registered building control approver. We tell you at the survey whether your job needs it and deal with the paperwork as part of the quote.
How much does a flat roof replacement cost in Hammersmith and Fulham?
£3,350–£5,850 for a 20 m² extension roof in EPDM with a new deck and insulation, at London guide rates including VAT. The fixed price comes after a free survey for new and replacement roofs.
Will a new flat roof be better insulated than the old one?
If it is over a heated room, yes. A full replacement usually has to be upgraded towards current insulation levels where feasible, and we build it as a warm roof with the insulation above the deck.
What guarantees come with a replacement roof?
Every re-roof comes with a written workmanship guarantee, with the length set out in your quote. Manufacturer material guarantees are available on many systems and we register them for you where the system allows; ask about insurance-backed options too.