Liquid-applied roofing across South Yorkshire

Price per m²

£86–£133

Typical life

10–25+ years by product

Manufacturer guarantees

10, 15 or 20-year guarantees by named system

Typical garage roof

£1,950–£3,100

How much does a liquid-applied roof cost in South Yorkshire?

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

Which flat roofs are common in South Yorkshire?

Flat roofs in South Yorkshire sit on bungalows with flat-roofed side extensions and dormers, lock-up garage blocks on estates and 1930s semis with flat-roofed garages and kitchen extensions. England averages roughly 870 mm of rain a year; the Pennine side of Yorkshire is wetter and windier than the east, so we specify for the site rather than the county. 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 South Yorkshire the application goes to Sheffield City Council, Rotherham Council, City of Doncaster Council and 1 other council. More on the rules.

When is a liquid roof the best option, and when is it not?

A liquid roof is often the best option for roofs crowded with pipes, vents and upstands, for balconies and walkways, and for overlaying a structurally sound roof that is starting to fail. It is the wrong choice when the deck is rotten, the insulation is wet or the falls are badly wrong.

Advantages: continuous finish with no laps; forms details around pipes and odd shapes easily; cold-applied with no flame; can often go over felt, asphalt or concrete; some systems take foot traffic.

Disadvantages: higher cost per square metre than felt or EPDM; needs dry weather and careful thickness control; only as good as the surface it is bonded to; product quality varies widely across the market.

For a straightforward re-roof on a fresh deck, EPDM or GRP may offer better value. Larger flat areas suit torch-on felt or single-ply. On a sound mastic asphalt roof, a compatible liquid system can sometimes be applied over it. See also our guide to overlay or strip.

Can a liquid roof go over my existing roof, and what preparation is needed?

Yes, if the existing roof is dry, firmly bonded and sitting on a sound deck. A liquid membrane is only as good as what lies beneath it, so we test the old roof before agreeing to overlay it.

At survey we check for:

• Trapped moisture: soft spots, blisters or wet insulation mean the roof should be stripped, because water sealed in will cause new blisters and decay.
• Deck condition: any sponginess or deflection needs repair first.
• Adhesion: on felt and asphalt, loose areas are cut out and patched, and the existing surface must take the primer properly.
• Falls and ponding: a coating follows the roof as it is. If water ponds now, it will pond on the new surface too unless the falls are corrected.

Preparation then follows: loose chippings removed, the surface cleaned and left to dry, blisters cut back and repaired, cracks filled, and the right primer applied. On older felt, mineral surfaces may need extra cleaning to give a good bond. Where the tests fail, we say so plainly and quote for a strip and re-roof. Read more on ponding water.

Which towns in South Yorkshire do we cover?

• Sheffield
• Rotherham
• Doncaster
• Barnsley
• Chapeltown
• Darton
• Dinnington
• Adwick le Street
• Nether Edge
• Rawmarsh
• Fulwood
• Maltby
• Thorne
• Wath upon Dearne
• Conisbrough
• Hoyland
• Wombwell
• Mexborough

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