Porch, bay and canopy roofs across Merseyside

Guide price

£700–£1,200

Survey

Free for new and replacement roofs

Quote

Fixed, in writing

Coverage

England, Wales, Scotland, NI

How much does a porch or bay roof cost in Merseyside?

Guide prices including VAT at North West rates. The fixed price comes after a free survey for new and replacement roofs.

Which flat roofs are common in Merseyside?

Flat roofs in Merseyside sit on 1960s and 1970s link-detached houses with flat-roofed garages and porches, lock-up garage blocks on estates and 1930s semis with flat-roofed garages and kitchen extensions. The North West is one of England's wetter regions, averaging roughly 1,290 mm of rain a year, so falls, outlets and well-detailed upstands matter more than the membrane colour. Approximate 1991–2020 regional averages based on Met Office data.

Building regulations in England

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. Renovated roofs over heated rooms are insulated to around 0.16 W/m²K where that's feasible, and new extension roofs are built to 0.15 W/m²K. In Merseyside the application goes to Liverpool City Council, Wirral Council, St Helens Borough Council and 2 other councils. More on the rules.

Do I need permission to re-roof a porch or bay?

Usually not. Re-covering a porch or bay roof without materially changing how it looks does not normally need planning permission, and an unheated open porch is not usually a thermal element.

The picture changes if the bay or porch is part of a heated room: replacing most of the roof can then bring it under the insulation rules for renovated roofs, which may need building control approval in England, a check in Wales, building standards in Scotland or district council building control in Northern Ireland. On a very small roof, adding insulation may not be technically feasible because of the height available below the window sill above. We assess that at survey.

Listed buildings need consent for changes that affect their character, and conservation areas can restrict changes to the front of a house. See our building regulations page for more detail.

Why do small porch and bay roofs carry a minimum charge?

Because a small roof needs nearly the same set-up as a larger one: a team, safe access, materials, trims, waste removal and travel. The roof area is only part of the cost.

A 2 m² canopy and a 6 m² bay still both need a full strip, a deck check, edge trims, a wall flashing and the same care at the drip edge. That is why our full re-roofs carry a minimum charge rather than being priced purely per square metre. It is also why bundling makes sense: if you have a porch, a bay and a garage, pricing them together usually works out better than three separate visits.

The junction with the house wall deserves the most attention on a porch. Many leaks blamed on a porch roof are actually water tracking behind a failed flashing or through porous brickwork above. We check the wall, the flashing and the frame head before recommending a new roof. If the problem is only the flashing, a targeted repair may be enough. Our flat roof leaks guide explains how leaks are traced.

Which towns in Merseyside do we cover?

• Liverpool
• Birkenhead
• St Helens
• Southport
• Wallasey
• Bootle
• Bebington
• Huyton
• Kirkby
• Prescot
• Heswall
• Maghull
• Newton-le-Willows
• Formby
• Garston
• Speke
• Norris Green
• Kirkdale
• Moreton
• Haydock
• Belle Vale
• Old Swan
• Allerton

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