Edge trims, outlets and drainage across Merseyside

Guide price

£110–£330

Repair price

Confirmed once the leak or damage is found

Condition survey report

£140–£290

Coverage

England, Wales, Scotland, NI

How much does a new roof edge or outlet cost in Merseyside?

Guide prices including VAT at North West rates. We confirm the price once we've traced the leak or seen the damage.

Which flat roofs are common in Merseyside?

Flat roofs in Merseyside sit on 1930s semis with flat-roofed garages and kitchen extensions, terraced streets with flat-roofed rear kitchens and bathrooms and newer estates where the first extension roofs are now being replaced. 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 flat roofs need overflows?

Roofs that drain to internal outlets or behind parapets should normally have an overflow, so that if an outlet blocks, water spills somewhere visible instead of rising over the upstands and into the building.

An overflow is usually a spout or weir set through the parapet or kerb at a level below the top of the upstands. When water runs from it, that is a sign the main outlet is blocked or overloaded. On a simple roof that drains over a drip trim into an external gutter, the open edge itself does the same job.

We look at where the water goes in heavy rain, how many outlets the roof has for its size, and whether the outlets, hoppers and downpipes are clear and properly connected. Leaf guards on outlets help on roofs near trees, as long as they are cleared regularly.

Should I fix the edges and drainage or replace the whole roof?

Fix the edges and drainage on their own if the covering is in good condition and the deck is sound. If the covering is near the end of its life or the falls need correcting across the whole roof, it is usually better value to do everything together as part of a replacement.

Trims and outlets are bonded into the waterproofing, so replacing them means cutting into the covering around the edge. On a roof with plenty of life left, that is a worthwhile repair. On an old, brittle covering, the new detail can end up stronger than the roof around it, and correcting falls means taking the covering off anyway. Our repair or replace guide sets out how to decide.

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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