Flat Roofing in Harrow

Harrow at a glance

Postcode districts: HA3, HA1, HA2, HA7, HA5, HA8, HA6
Council area: London Borough of Harrow
Building approval: London Borough of Harrow 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 Harrow?

Warm roof insulation upgrades

Small commercial buildings in Harrow with large flat roofs can lose a lot of heat through them. Where the roof is being replaced, upgrading the insulation at the same time is required in most cases and helps reduce running costs for the occupier.

Balconies and roof terraces

A roof terrace in Harrow may be re-waterproofed when the owners want to change the finish, swapping old tiles for decking or porcelain on pedestals. Lifting the surface exposes the membrane, and replacing it then avoids having to lift the new finish again later.

Flat roof surveys and leak tracing

Older extensions and garages in Harrow frequently have felt roofs that have been patched several times. Before paying for another repair, many owners want to know whether the roof has much life left. That is exactly the question a condition survey answers.

All flat roof services in Harrow:

How much does a flat roof cost in Harrow?

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
Extension (20 m²), EPDM, insulation + 1 rooflight upstand	£3,600–£6,300
Single garage (18 m²), torch-on felt	£1,800–£3,150
Condition survey and leak investigation	£180–£360
Single garage (18 m²), GRP fibreglass	£2,150–£3,900

What flat roofs are typical in and around Harrow?

In a town like Harrow flat roofs are mostly on Victorian and Edwardian terraces with flat-roofed back additions and mansard and dormer loft conversions. Weather matters on a flat roof. 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 Harrow?

Where approval is needed it goes to London Borough of Harrow 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 Harrow do we cover?

Flat roofing in Harrow: questions

Do you cover Harrow?

Yes, including postcode districts HA3, HA1, HA2, HA7, HA5, HA8 and 1 more. Send your postcode with your enquiry and we'll arrange a survey.

Can you repair a leaking flat roof in Harrow?

Yes. We trace where the water is actually getting in first, because the leak inside is rarely under the defect outside, then repair with materials compatible with your roof.

How much is a new flat roof in Harrow?

A typical 18 m² EPDM garage roof is £1,900–£3,350 and a 20 m² insulated EPDM extension roof is £3,350–£5,850, at London guide rates including VAT.

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

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.