Extension, Garage & Porch Roofs

The small roofs — built with the same care as the big one.

A remarkable share of the leaks we trace end at a small roof: the extension where it meets the house, the garage that got the cheapest felt available in 1995, the porch whose builder was a jack of many trades and a roofer of none. Small roofs concentrate the hardest details — abutments, low pitches, junctions with older structures — into a few square metres, which is why they punish shortcuts.

We build and replace pitched and flat roofs for extensions, garages, porches, bays and outbuildings, matched to the main house where that's the aim: the same tile or slate, the pitch handled correctly (small roofs often sit below the main covering's minimum pitch, which changes the right material), and the wall junction flashed properly into the existing house — the single detail most bodged extensions get wrong.

For flat versions, the modern options are far better than their reputation: see EPDM rubber and GRP fibreglass — both 25-year-plus coverings well suited to garages and extensions.

Benefits

Why choose Extension, Garage & Porch Roofs

Coverings matched to the main house where wanted
Pitch checked against the covering — no doomed low-pitch tiling
House-to-roof junctions flashed and chased properly
Warm-deck build-ups for habitable extensions
Pitched and flat options priced side by side where both work

Features

What's included

Extension roofs, pitched and flat
Garage re-roofs in felt, EPDM, GRP or tile
Porch, bay and canopy roofs
Lean-to and mono-pitch construction
Insulation to Building Regulations for habitable spaces

Repair options

Repair or replace

Garage and porch roofs are where "just patch it" is sometimes genuinely right — an outbuilding roof doesn't always justify its best possible covering. We'll price the honest patch and the proper replacement, tell you the realistic life of each, and let the building's importance decide. For leaks where an extension meets the house, though, patching over a bad junction almost never holds — that's a flashing detail, and it needs doing correctly once.

Common questions

Frequently asked

My extension leaks where it meets the house — why is this so common? +

Because it's the hardest detail on the job and the most-skipped: the flashing there should be stepped and chased into the house wall's mortar joints. Many extensions instead got surface-stuck flashing and a bead of sealant, which fails within a few years. The repair is to do the detail properly — cut the chase, step in lead, wedge and point.

What's the best covering for a garage roof? +

For a typical flat garage roof, EPDM rubber is the sweet spot — one seamless sheet, 25+ years, sensible cost. Felt remains fine on a budget; GRP suits garages you'll walk on. If the garage is pitched, matching the house tiles usually looks best and costs little more.

Do small roofs need Building Regulations approval? +

Re-covering like-for-like generally doesn't. New structures, structural changes, and any roof over habitable space (extensions especially, for insulation) do. We'll tell you what applies to your job and handle the compliance where it's needed.