Flat Roofing in Southwark

Southwark at a glance

Postcode districts: SE5, SE15, SE17, SE22, SE14, SE11, SE1, SE8
Council area: London Borough of Southwark
Building approval: London Borough of Southwark 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 Southwark?

Torch-on felt roofing

On larger roofs in Southwark with poor falls, torch-on felt pairs well with tapered insulation, which builds the fall into the insulation boards. That deals with ponding properly while adding insulation, rather than patching the low spots and waiting for the next leak.

Flat roof replacement

Exposure matters too. Wind lifts tired edges, and repeated wetting and drying works at old joints, so roofs in exposed spots can wear faster than the same roof somewhere sheltered. Wherever your property is in Southwark, a survey tells you whether the roof has years left or needs replacing now.

Dormer roofs

High, exposed dormers in Southwark take the full force of the wind and rain. Edge trims loosen, flashings lift and the felt at the drip edge cracks. Once the faults spread around the perimeter, a new roof with fresh trims usually lasts far longer than another round of repairs.

All flat roof services in Southwark:

How much does a flat roof cost in Southwark?

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
Commercial roof (100 m²), single-ply + insulation	£15,900–£26,150
Single garage (18 m²), EPDM rubber	£1,900–£3,350
Condition survey and leak investigation	£180–£360
Extension (20 m²), EPDM, new deck + insulation	£3,350–£5,850
Extension (20 m²), GRP, new deck + insulation	£3,600–£6,450

What flat roofs are typical in and around Southwark?

In a town like Southwark flat roofs are mostly on mansion blocks and purpose-built flats with large flat roofs and mansard and dormer loft conversions. 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 Southwark?

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

Flat roofing in Southwark: questions

Do you cover Southwark?

Yes, including postcode districts SE5, SE15, SE17, SE22, SE14, SE11 and 2 more. Send your postcode with your enquiry and we'll arrange a survey.

Do flat roofs in Southwark 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 Southwark that's London Borough of Southwark building control, or a registered building control approver. We tell you at the survey and handle it.

How much is a new flat roof in Southwark?

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.

Do you also cover Lambeth?

Yes. Lambeth is about 2 miles from Southwark and we cover it too.