Dereham Roofing Specialists
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Flat Roofing

Flat Roofing

Flat roofs need specialist installation and the right materials to perform reliably in Norfolk's climate. We install and repair flat roofs on extensions, garages, and commercial buildings throughout Dereham using GRP fibreglass and EPDM rubber systems.

Image: Dereham flat roofing

What's involved

Flat Roofing in Dereham

Flat roofing covers everything from single-storey extensions and garage roofs to larger commercial or agricultural buildings. It's a common feature on properties across Dereham, particularly on post-war houses with rear kitchen or bathroom extensions, and on detached garages. When a flat roof starts to blister, crack, or pond water, it needs attention quickly — small failures lead to wet insulation and rotting decking within months.

We install flat roofs using two principal systems. GRP fibreglass is our most popular choice for extensions and porches — it's laid as a seamless, rigid shell with no joints to fail and carries a 25-year guarantee from the manufacturer. EPDM rubber is well suited to larger surface areas and is highly resistant to UV degradation and temperature extremes, with an expected lifespan of 40 years or more. For repairs to existing systems, including older felt roofs, we identify the source of failure before recommending the most cost-effective fix.

Flat roofs installed incorrectly — inadequate falls, poor detailing at upstands and outlets, or incompatible materials — fail quickly and cause expensive damage to the structure below. Both GRP and EPDM require careful preparation of the deck and precise application to perform to their rated lifespan, which is why material supplier warranties are tied to approved installer standards.

We survey the existing roof, agree the specification in writing, and complete most domestic flat roofs within one to two days. All installations come with both a manufacturer material warranty and our own workmanship guarantee. We're fully insured and happy to provide references from previous flat roofing projects in the Dereham area.

Flat roofs in Dereham typically cost between £70 and £120 per square metre for a GRP fibreglass installation, depending on deck condition and detailing complexity.

Itemised quote
Materials, labour, scaffold broken out
Fixed start date
With a daily schedule
10-year guarantee
Workmanship, in writing
Fully insured
£5m public liability

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Emergency roof repair?

Storm damage, active leak, damaged ridge — we aim to be on-site within 24 hours.

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Questions

What people ask first.

A new roof on a standard three-bedroom semi-detached house in Dereham typically costs between £5,500 and £9,000. The price depends on the roof size, pitch, material choice (concrete tile, clay tile, or natural slate), and whether fascias and soffits need replacing. We provide a free, itemised written quote before any work begins.
A repair makes sense when damage is isolated — a handful of slipped tiles or a small section of failed flashing, for example. Replacement is more cost-effective when over 25–30% of the roof covering has failed, when the timbers underneath are rotting, or when the roof is over 40 years old and showing widespread deterioration. We'll tell you honestly which option is right after a free survey.
Minor repairs such as replacing a handful of slipped tiles typically cost between £150 and £350. Re-ridging a terraced or semi-detached house in Dereham usually falls between £400 and £800. More involved work such as replacing chimney flashings or repairing valley gutters can range from £300 to £700. We provide a written quote after inspection so there are no surprises.
A GRP fibreglass flat roof in Dereham typically costs between £70 and £120 per square metre, fully installed. A standard garage roof of around 20 square metres would therefore cost in the region of £1,400 to £2,400. EPDM rubber systems are similarly priced and may be more economical on larger areas. We'll give you an exact figure after measuring up and assessing the existing deck.
Fascia and soffit replacement in Dereham typically costs between £80 and £120 per linear metre for uPVC boards, including labour, materials, and waste removal. A typical three-bedroom semi with around 30 metres of fascia runs between £900 and £1,500 depending on access and whether any rafter foot repairs are needed. We provide a fixed written quote before work starts so there are no surprises.
A standard chimney flashing replacement in Dereham typically costs between £250 and £600, depending on the size of the chimney stack and the amount of lead required. Full lead valley replacements on a larger period property can run from £800 to £1,800 or more. We give a fixed written quote after inspecting the area so you know exactly what you're paying before we start.
A chimney rebuild from the flashing line upwards in Dereham typically costs between £800 and £2,000, including scaffold, materials, and new pots and flaunching. If new leadwork is required at the same time, that adds to the cost depending on the size of the detail. We give a full written quote after inspecting the stack — the price won't change once you've accepted it.
Chimney take-downs in Dereham typically cost between £700 and £1,500 for a standard residential stack, including scaffold, demolition, roof reinstatement, and waste removal. The main variables are the height of the stack, the pitch of the roof, and whether we need to source matching tiles or slates to reinstate the roof covering. We provide a full fixed-price quote before any work begins.
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