Which flat roof system is best for my extension?

For extensions, we typically recommend GRP fibreglass due to its seamless finish, 25+ year lifespan, and ability to be walked on. EPDM is a great alternative for larger areas or tighter budgets. Our roofers will assess your specific needs during a free survey.

How long do flat roofs last?

Modern flat roofing systems last much longer than traditional felt. GRP fibreglass lasts 25-30+ years, EPDM rubber 30+ years, and modern built-up felt 15-20 years. Proper installation by accredited professionals is key to achieving these lifespans.

Can I walk on my flat roof?

GRP fibreglass roofs are designed to be walked on and are ideal for balconies and roof terraces. EPDM can handle light foot traffic. Traditional felt should only be walked on for maintenance. Your roofer will advise on the best system for your intended use.

How much does a flat roof cost?

Flat roof costs depend on size, system, and access. As a guide: felt costs £40-60/m², EPDM £60-80/m², and GRP £80-120/m². For a typical garage (15m²), expect £600-900 for felt, £900-1,200 for EPDM, or £1,200-1,800 for GRP including labour.

What causes flat roofs to leak?

Common causes include poor installation, age-related deterioration, ponding water, failed flashings, and debris accumulation. Modern systems like GRP and EPDM largely eliminate these issues when properly installed by accredited professionals.

Do I need Building Regulations approval for a flat roof?

Replacing more than 25% of a flat roof usually triggers Building Regulations, mainly for insulation standards. Many of our roofers are CompetentRoofer registered and can self-certify, saving you council fees and paperwork.

Trusted by 8,000+ UK homeowners

GRP, EPDM and felt systems

Save up to 40% on your flat roof

Name: TopNotch Roofers
Address: GB
Telephone: 0800 123 4567
Price range: Free
Rating: 4.9

Match instantly with accredited flat roofing specialists in your postcode. Itemised written quotes, zero upfront payment, and guarantees of up to 25 years on the finished system.

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Free quotes are for property owners. Non-owners can book a paid survey (£199, refunded if you proceed).

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Modern flat roofing solutions

Flat roofs need specialist knowledge and the right material for the job. We connect you with accredited flat roofing experts who advise on the best system for your property, budget, and how the roof will actually be used.

House extensionsGarage roofsDormer windowsGarden officesBalconies & terracesBay window roofsOutbuildingsCommercial properties

Find specialists for every system

Each system has its strengths. Our accredited roofers will help you pick the right one based on your property, budget, and how the roof will be used.

The premium choice

GRP fibreglass

Glass Reinforced Plastic creates a seamless, watertight finish that's virtually maintenance-free and comes in a range of colours.

25+ year lifespan
Seamless, watertight finish
UV stable, no cracking or fading
Can be walked on safely
Fire resistant

Ideal for: Extensions, dormers, balconies, and anywhere needing a long-lasting premium finish.

The reliable choice

EPDM rubber

A highly durable synthetic rubber membrane. Flexible, UV resistant, and excellent for covering large areas cost-effectively.

30+ year lifespan
Highly flexible
UV and weather resistant
Low maintenance
Quick installation

Ideal for: Garages, garden buildings, larger flat roofs, and green roof systems.

The traditional choice

Built-up felt

Modern high-performance felt systems have moved on from old-style felt. Multiple layers create a robust, waterproof barrier proven over decades.

15-20 year lifespan
Cost-effective solution
Proven technology
Good for repairs and overlays
Suitable for most budgets

Ideal for: Budget-conscious projects, shed roofs, and properties where cost is the priority.

Worried about picking the wrong roofer? You should be.

Britain has 80,000 roofing contractors. Most homeowners can't tell the difference. We can. Here's how we protect you.

Worried about cowboy roofers?

Every contractor we match you with is NFRC, TrustMark, or Checkatrade verified. Fully insured to £5m public liability. Background checked. We do the vetting so you don't have to.

Don't want to pay upfront?

Zero deposits. Pay only when the work is finished and you're happy. Finance options available, spread the cost over 12, 24, or 60 months at competitive rates.

What if something goes wrong?

Every job comes with a 15-year Insurance-Backed Guarantee at no extra cost. If your roofer goes out of business, your work stays covered. That's a promise.

Free No upfront payment 15-year guarantee

Three steps to your new roof

From quote to completion, we make it ruthlessly simple.

Tell us about your job

Answer 4 quick questions. Takes under 60 seconds.

We match you with a top-rated local roofer

Every roofer is accredited, insured, and rated 4.5+ stars.

Get an itemised quote, decide in your own time

No pressure, no obligation. Quote valid for 30 days.

Real reviews from verified UK homeowners

4.9/5 average from 750+ verified reviews on Google, Trustpilot, and Checkatrade.

Completed re-roof on a Manchester semi-detached home

Complete Re-roof

"Was worried about finding a trustworthy roofer after hearing horror stories. This service connected me with a brilliant NFRC-registered contractor. Detailed written quote, handled Building Regs, and the 15-year IBG guarantee gives real peace of mind."

James T.

Manchester

Google · 5 days ago Verified

Slate Re-tiling

"The roofer they recommended was fantastic. Fully insured with £5m cover, gave an itemised quote breaking down materials and labour. No upfront payment asked, just staged payments. Exactly how it should be done."

Sarah M.

Birmingham

Trustpilot · 1 week ago Verified

Newly installed EPDM flat roof on a London extension

Flat Roof EPDM

"Found a great flat roof specialist through this service. They were CompetentRoofer registered so could self-certify the Building Regs and saved me £300 in council fees. Work completed on time."

David C.

London

Google · 3 days ago Verified

Emergency roof repair with tarpaulin in place on a Leeds home

Emergency Repair

"Storm damage on a Sunday. Had a roofer out within 4 hours to make it watertight. They came back Monday with a proper quote. Transparent pricing, no pressure, and the Insurance-Backed Guarantee was included as standard."

Margaret H.

Leeds

Checkatrade · 2 days ago Verified

Completed new tile roof on a Bristol terrace

New Roof

"Got three quotes through Top Notch. The differences were eye-opening. Saved £4,200 versus the first roofer who came to my door cold. All three were fully accredited so I knew the price was the only variable."

Paul R.

Bristol

Trustpilot · 2 weeks ago Verified

Repaired brick chimney with new pots on a Sheffield rooftop

Chimney Repairs

"Quick, professional, and the roofer turned up exactly when promised. Itemised quote meant no nasty surprises at the end. Would absolutely use again and have already recommended to a neighbour."

Linda B.

Sheffield

Google · 6 days ago Verified

💷 Spread the cost · Finance available🚫 No upfront payments📝 Quote valid 30 days🛡️ Insurance-Backed Guarantee

Why choose Top Notch Roofers

We've already vetted them

Most homeowners spend hours searching for a trusted roofer. We've already done it. Every roofer is accredited, insured, and rated 4.5 stars or higher before they're ever sent to you.

Itemised, transparent quotes

No surprise charges. Every quote breaks down materials, labour, scaffolding, and timeframe in plain English. If a roofer can't justify the price, we don't recommend them.

Up to 40% cheaper prices

Roofers compete for your job, so prices come down. Our customers report saving up to 40% versus the first quote they received elsewhere.

Fully protected work

Every job includes a 15-year Insurance-Backed Guarantee at no extra cost. Your roof is covered even if the contractor isn't around in 10 years' time.

Free No upfront payment 15-year guarantee NFRC accredited

Flat roofing questions

Everything you need to know before you click.

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Free No upfront payment 15-year guarantee NFRC accredited