New Roof Installations

A new roof on a new structure is a different job from a re-roof. There is no existing covering to match or remove, but there are more decisions: pitch, structure, ventilation, insulation, how the new roof meets the old, and how it drains. We work with your builder or architect, or directly with you, to get those decisions right before the first batten goes on.

We install pitched roofs in tile and slate and flat roofs in GRP, EPDM and felt, and we handle the junctions between new and existing roofs where most new-build leaks start.

Before and after: full re-roof from above

A 1930s mock-Tudor semi in south London. The worn clay tiles were stripped and replaced with grey interlocking tiles, with new roof windows, new lead to both chimneys and a new flat roof over the bay. The drone shots show the whole roof before and after. For a slate example see our slate roofing page.

The same roof before: worn clay tiles with moss between the two already re-tiled sections — Before

Completed re-roof in grey interlocking tiles with new roof windows and leadwork — After

Warning signs

Extension or garden roomA new roof that must tie into the existing house without creating a leak path.

Loft conversionDormers and new pitches that need careful flashing and ventilation.

Replacement garage roofOften a flat roof on a new deck, sometimes converted to a shallow pitch.

New build or self-buildFull roof from trusses or cut rafters to finished covering.

Porch or bay roofSmall, but the detailing at the wall is where they fail.

Outbuilding or annexeA simple, durable roof that will not need attention for decades.

What we do

Pitched roofs in clay tile, concrete tile, natural or fibre-cement slate
Flat roofs in GRP fibreglass, EPDM rubber or three-layer felt
Warm-roof and cold-roof build-ups with the correct insulation and ventilation
Lead and proprietary flashings at abutments, dormers and parapets
Fascias, soffits, guttering and downpipes
Roof windows and skylights fitted and flashed
Co-ordination with building control for sign-off

Materials and methods

We specify to Building Regulations Part L for insulation and Part C for weather resistance. Membranes are breathable (Klober, Tyvek or equivalent), battens are graded and treated, and flat roof decks are 18 mm WBP or OSB3 with falls built in. Ventilation is designed in from the start so condensation is never a problem later.

Why choose us for new roof installations

One contractor responsible for the whole roof, including the junction with the existing building
Materials and build-up chosen for the roof, not what is on the van
Ventilation and insulation designed in, so no condensation problems later
Long manufacturer guarantees on flat roof systems, plus our workmanship guarantee
Building control liaison handled for you

What to expect

We review the drawings or visit the site, confirm the specification and give you a fixed quotation. On site we work to the builder's programme and keep you updated daily. The roof is handed over with photographs, the guarantee documents and the manufacturer certificates for any flat roof system.

Related projects

Finished natural slate roof with dormer and rooflight

Slate re-roof

Natural slate re-roof with dormer and rooflight

Full strip, insulation between rafters, new membrane and battens, natural slate, chimney leadwork and a new dormer.

All projects →

Frequently asked questions

Can you work alongside my builder?

Yes. Most new roofs are part of a larger project and we are used to fitting into a programme and co-ordinating with trades.

What pitch does my extension roof need?

It depends on the covering. Concrete interlocking tiles can go as low as 15 to 22 degrees; clay plain tiles need 35 degrees. Below that, a flat roof system is the right answer.

Do I need Building Regulations approval?

For a new roof, yes, usually as part of the overall project. We provide the information building control needs.

Which flat roof system is best for an extension?

For a large simple rectangle, EPDM. For a roof with many details or one you will walk on, GRP. See our flat roofing comparison guide.