Flat roof replacement across Isle of Anglesey

Guide price

£2,600–£4,500

Survey

Free for new and replacement roofs

Quote

Fixed, in writing

Coverage

England, Wales, Scotland, NI

How much does a flat roof replacement cost in Isle of Anglesey?

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

Which flat roofs are common in Isle of Anglesey?

Flat roofs in Isle of Anglesey sit on terraced streets with flat-roofed rear kitchens and bathrooms, lock-up garage blocks on estates and bungalows with flat-roofed side extensions and dormers. Wales averages roughly 1,460 mm of rain a year, among the wettest in Britain, so we design for steady run-off: proper falls, clear outlets and upstands well above the finished roof. Approximate 1991–2020 regional averages based on Met Office data.

Building regulations in Wales

Welsh guidance is that most re-roofing needs building control approval, so it's worth checking whenever more than a quarter of a roof is replaced or repaired. Renovated roofs are upgraded to around 0.16 W/m²K where feasible, and new extension roofs are built to 0.13 W/m²K under the Welsh Approved Document L. In Isle of Anglesey the application goes to Isle of Anglesey County Council. More on the rules.

Do I need building regulations approval to replace a flat roof?

Often, yes. Replacing the covering of a flat roof over a heated room is usually treated as renovating a thermal element, which brings insulation requirements and, in most cases, approval.

In England, if more than half of that roof is renovated, the whole roof should be upgraded towards a U-value of 0.16 W/m²K for homes (0.18 for non-domestic buildings) where that is technically, functionally and economically feasible, judged against a simple payback of 15 years. Approval comes from building control or self-certification through a registered competent person scheme. Structural changes, or a covering that adds 15% or more to the roof's weight, also need approval.

The other nations differ: most re-roofing in Wales needs approval, Scotland works through building standards and the building warrant, and in Northern Ireland you contact the district council's building control first. An unheated detached garage is not normally a thermal element. Planning permission is not usually needed if the roof looks much the same afterwards, though listed buildings and conservation areas are different. We handle approvals where needed; see building regulations.

Which system should I replace my flat roof with?

The right system depends on the roof's size, shape, use and number of details, so no single material suits every roof. These are the usual starting points:

• EPDM rubber suits simple, rectangular roofs, where one sheet can often cover the area with few or no joins.
• GRP fibreglass suits roofs with many corners, rooflights or edges, and gives a rigid surface for occasional maintenance traffic.
• Torch-on felt is a layered, hard-wearing system that keeps the cost down on larger or plain roofs.
• Liquid-applied systems handle awkward details and can overlay a sound existing surface.
• Single-ply and mastic asphalt are more usual on commercial roofs, blocks and terraces.

We recommend a system at survey and explain why. Our EPDM vs GRP vs felt guide sets out the trade-offs if you want to compare first.

Which towns in Isle of Anglesey do we cover?

• Holyhead

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