Flat Roofing in Wandsworth

Wandsworth at a glance

Postcode districts: SW18, SW15, SW11, SW17
Council area: London Borough of Wandsworth
Building approval: London Borough of Wandsworth building control, or a registered building control approver
Guide price region: London (+20% on West Midlands rates)

What flat roof work do we do in Wandsworth?

Garage roofs

A garage in Wandsworth that is becoming a workshop, gym or home office is a good reason to replace its roof. That is the moment to think about insulation and a warm-roof build-up, so the roof does not have to be stripped again when the space is heated.

Warm roof insulation upgrades

Many flat-roofed extensions and dormers in Wandsworth were built with little or no insulation, or with a cold roof that was never properly ventilated. Those rooms are often hard to heat in winter and can suffer condensation, mould and, in time, a rotten deck.

Extension and kitchen roofs

Rooflights fitted after the roof was built are a frequent source of trouble in Wandsworth extensions. If the kerb was not formed properly or the membrane was simply sealed around the frame, leaks follow. Replacing the roof is the chance to rebuild every upstand to a proper standard.

All flat roof services in Wandsworth:

How much does a flat roof cost in Wandsworth?

Guide prices at London rates including VAT. New and replacement roofs get a fixed price after a free survey; repair prices are confirmed once we've found the problem.

Job	Guide price inc VAT
Dormer (8 m²), GRP, scaffold	£1,700–£3,200
Single garage (18 m²), torch-on felt	£1,800–£3,150
Porch or bay (4 m²), EPDM	£900–£1,500
Single garage (18 m²), EPDM rubber	£1,900–£3,350
Single garage (18 m²), GRP fibreglass	£2,150–£3,900

What flat roofs are typical in and around Wandsworth?

In a town like Wandsworth flat roofs are mostly on mansion blocks and purpose-built flats with large flat roofs and Victorian and Edwardian terraces with flat-roofed back additions. Rain and wind decide how a flat roof is detailed. 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. Approximate 1991–2020 regional averages based on Met Office data.

Who approves flat roof work in Wandsworth?

Where approval is needed it goes to London Borough of Wandsworth building control, or a registered building control approver. Replacing more than half of a roof over a heated room usually counts as renovating a thermal element, so it is insulated to current standards and notified to building control. How the rules work.

Which places near Wandsworth do we cover?

Flat roofing in Wandsworth: questions

Do you cover Wandsworth?

Yes, including postcode districts SW18, SW15, SW11, SW17. Send your postcode with your enquiry and we'll arrange a survey.

Do you also cover Hammersmith and Fulham?

Yes. Hammersmith and Fulham is about 3 miles from Wandsworth and we cover it too.

What's the best flat roof system for a house in Wandsworth?

For most garages and extensions it's EPDM or GRP; torch-on felt is the budget option and liquid suits detailed or overlay jobs. We recommend one at the survey.

Do flat roofs in Wandsworth need building control approval?

Often. Replacing more than half of a roof over a heated room usually means insulating it to current standards and notifying building control, and structural changes need approval too. In Wandsworth that's London Borough of Wandsworth building control, or a registered building control approver. We tell you at the survey and handle it.