Flat Roofing Contractors in London

London at a glance

Largest towns: Westminster, Camden, Islington, Haringey
Postcode areas: BR, CR, DA, E, EC, EN, HA, IG, KT, N
Building control: City of Westminster, London Borough of Camden, London Borough of Islington and 29 other councils
Neighbouring areas: Surrey · Hertfordshire · Buckinghamshire · Berkshire
Guide price region: London (+20% on West Midlands rates)

Which towns in London do we cover?

32 towns and cities have their own page; we cover everywhere in between too.

What does a flat roof cost in London?

Guide prices at London rates, including VAT. The fixed price comes after a survey.

Job	Guide price inc VAT
Condition survey and leak investigation	£180–£360
Emergency temporary weatherproofing visit	£220–£540
Commercial roof (100 m²), single-ply + insulation	£15,900–£26,150
Dormer (8 m²), GRP, scaffold	£1,700–£3,200
Extension (20 m²), EPDM, new deck + insulation	£3,350–£5,850
Extension (20 m²), EPDM, insulation + 1 rooflight upstand	£3,600–£6,300

Which flat roofs are common in London?

The climate is part of the brief. 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. Across London, flat roofs are typically found on mansion blocks and purpose-built flats with large flat roofs, kitchen extensions and roof terraces behind period houses and mansard and dormer loft conversions. Approximate 1991–2020 regional averages based on Met Office data.

Which flat roof jobs do we take on in London?

Flats, HMOs and block roofs

Leaseholders in London want to see where their money goes. Our itemised quotes show each element of the job separately, including scaffold, insulation and provisional sums for hidden defects, which makes them easier to share and compare when the freeholder or agent is consulting on the work.

Balconies and roof terraces

Door thresholds are a common reason for balcony work in London. Where a door was fitted with a low step-out and no drainage channel, water driven against the frame finds its way under the sill. Re-waterproofing gives the chance to rebuild that detail properly.

Liquid-applied roofing

Liquid systems suit balconies and walkways in London because they form neatly at door thresholds, railings and drains, and some products are designed to take foot traffic. Converting a roof into a new terrace is a different matter, and usually needs planning permission first.

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 services do we offer in London?

Flat roofing in London: questions

How much is a new flat roof in London?

A typical 18 m² EPDM garage roof is £1,900–£3,350 and a 20 m² insulated GRP extension roof is £3,600–£6,450, at London guide rates including VAT.

Which roofing systems do you fit in London?

EPDM rubber, GRP fibreglass, torch-on felt, liquid-applied and single-ply, plus mastic asphalt repairs. The survey decides which suits your roof.

Do you work on commercial roofs in London?

Yes: shops, offices, units and blocks of flats across London, with work planned around opening hours and residents.

Do you cover all of London?

Yes. We cover the whole of London, including Westminster, Camden, Islington, Haringey. If your town isn't listed, send your postcode and we'll confirm.

Flat roofing contractors in London