Torch-on felt roofing across Derbyshire

Price per m²

£59–£103

Typical life

15–25 years

Manufacturer guarantees

10–20 year material guarantees on specified systems

Typical garage roof

£1,500–£2,550

How much does a torch-on felt roof cost in Derbyshire?

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

Which flat roofs are common in Derbyshire?

Flat roofs in Derbyshire sit on 1960s and 1970s link-detached houses with flat-roofed garages and porches, 1930s semis with flat-roofed garages and kitchen extensions and newer estates where the first extension roofs are now being replaced. The East Midlands is drier than the west of Britain, so most flat roofs here fail through age, UV and poor detailing at upstands rather than sheer rainfall. 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 Derbyshire the application goes to Derby City Council, Chesterfield Borough Council, Erewash Borough Council and 4 other councils. More on the rules.

Is torch-on roofing safe, and what is the difference between two- and three-layer systems?

Yes, torch-on is safe when hot works are properly controlled, because most roof fires linked to torching start at hidden timber or debris near edges and upstands, not on the open roof. Our teams follow a hot-works routine on every job:

• check eaves, fascias, soffits and wall cavities for timber, nests and debris before lighting a torch;
• use a cold-applied or self-adhesive membrane, rather than a flame, at edges, against combustible materials and in tight details;
• keep fire extinguishers on the roof and the gas bottles secured and away from the work;
• stop torching well before the team leaves, then carry out a fire watch so smouldering is spotted while people are still on site.

As for layers, a two-layer system (underlay plus cap sheet) is common on domestic roofs such as garages and extensions. A three-layer system adds an intermediate sheet, giving more thickness and redundancy, and is often specified on larger, commercial and multi-occupied roofs. The right choice depends on the size and use of the roof and the system's requirements, so we set it out in the quote.

Near a boundary, the external fire performance of the tested build-up, such as a BROOF(t4) classification, can also matter, and we check it where it applies.

How long does a torch-on felt roof last, and what is the guarantee?

A modern torch-on roof typically lasts 15 to 25 years, and high-performance systems with better membranes can last longer. That is a big step up from older felt roofs, which were often single-layer, unreinforced or poorly bonded.

What shortens the life of a felt roof is usually visible: mineral chippings worn away so the bitumen is exposed to sunlight, blisters where moisture was trapped, split laps, and upstands that have slumped or pulled away from the wall. Ponding speeds all of this up.

Manufacturer material guarantees are available on many specified torch-on systems; they often depend on a particular build-up and registration, which we handle where the system allows. Every re-roof also comes with our written workmanship guarantee, the length of which is stated in the quote, and insurance-backed options can be discussed. Our flat roof lifespan guide compares felt with the other systems.

Which towns in Derbyshire do we cover?

• Derby
• Chesterfield
• Long Eaton
• Ilkeston
• Swadlincote
• Staveley
• Belper
• Heanor
• Alfreton
• Dronfield
• Ripley
• Buxton
• New Mills
• Glossop
• Sinfin

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