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.

Can you install a flat roof in winter?

GRP fibreglass requires temperatures above 5°C and dry conditions, so winter installation can be challenging. EPDM is more flexible and can be installed in cooler weather. Your roofer will advise on the best timing and may use temporary weatherproofing if needed.

How much does a new roof cost in the UK?

The average cost of a new roof in the UK ranges from £5,000 to £12,000 depending on property size, roof type, and materials. A terraced house typically costs £4,000-£6,500, semi-detached £5,000-£8,500, and detached properties £7,000-£15,000. Use our free roof cost calculator for an instant estimate.

What is the average roof replacement cost?

The average roof replacement cost in the UK is between £5,000 and £8,000 for a typical semi-detached house. Factors affecting price include roof size (measured in sqm), material choice (concrete tiles, clay tiles, slate), access requirements, and location. London prices are typically 20-30% higher.

How much does flat roof replacement cost?

Flat roof replacement costs £40-55 per sqm for felt, £65-85 per sqm for EPDM rubber, and £75-100 per sqm for GRP fibreglass. A typical garage flat roof costs £1,500-£3,000, while a larger extension flat roof costs £2,500-£5,000 for complete replacement.

How much is a new roof for a semi-detached house?

A new roof for a semi-detached house typically costs between £5,000 and £8,500. This includes all materials, labour, and scaffolding. The exact price depends on roof size (usually 50-70 sqm), material choice, and any additional work like fascias, soffits, or guttering.

What is the townhouse roof replacement cost?

Townhouse roof replacement typically costs between £5,500 and £9,000. The unique structure of townhouses often means a smaller roof footprint but potentially more complex access. Our roof replacement cost calculator provides personalised estimates based on your specific property.

How do I get a new roof quote?

Use our free roof replacement cost calculator to get an instant estimate in under 2 minutes. Then we'll connect you with up to 3 vetted, accredited roofers who will provide detailed, no-obligation quotes. Compare prices and save up to 40% on your new roof.

What affects roof replacement cost?

Key factors affecting roof replacement cost include: roof size (sqm), material choice (slate costs more than tiles), property access and scaffolding requirements, location (London prices 20-30% higher), and additional work needed such as fascias, soffits, guttering, or chimney repairs.

How much does reroofing cost per square metre?

Reroofing costs per square metre vary by material: concrete tiles £50-65/sqm, clay tiles £70-90/sqm, natural slate £90-120/sqm, synthetic slate £60-80/sqm. These prices include labour, materials, and standard access. Scaffolding is typically an additional £600-£1,200.

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Modern Flat Roofing Solutions

Flat roofs require specialist knowledge and the right materials. We connect you with accredited flat roofing experts who can advise on the perfect solution for your property and budget.

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.

GRP Fibreglass

The Premium Choice

Glass Reinforced Plastic (GRP) is the gold standard in flat roofing. It creates a seamless, watertight finish that's virtually maintenance-free and comes in a range of colours.

Key Benefits:

25+ year lifespan
Seamless, watertight finish
UV stable - no cracking or fading
Can be walked on safely
Fire resistant
Ideal for balconies and walkways

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

EPDM Rubber

The Reliable Choice

Ethylene Propylene Diene Monomer (EPDM) is a highly durable synthetic rubber membrane. It's flexible, UV resistant, and excellent for covering large areas cost-effectively.

Key Benefits:

30+ year lifespan
Highly flexible - expands and contracts
UV and weather resistant
Low maintenance
Environmentally friendly
Quick installation

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

Built-Up Felt

The Traditional Choice

Modern high-performance felt systems have come a long way from the old-style felt. Multiple layers create a robust, waterproof barrier that's proven over decades of use.

Key Benefits:

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

Ideal for: Budget-conscious projects, shed roofs, and properties where cost is a primary concern.

At a Glance Comparison

Feature	GRP Fibreglass	EPDM Rubber	Built-Up Felt
Lifespan	25+ years	30+ years	15-20 years
Cost	£££	££	£
Maintenance	Very Low	Low	Moderate
Walkable		Limited	No
Seamless Finish		Joints	Overlaps

Flat Roofing FAQs

Common questions about flat roof systems and installation.

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

Slate Re-tiling

"The roofer they recommended was fantastic – fully insured with £5m cover, gave an itemised quote breaking down materials and labour, and the Welsh slate re-tiling is superb. No upfront payment asked, just staged payments. Exactly how it should be done."

Flat Roof (EPDM)

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

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 for the full repair. Transparent pricing, no pressure, and the Insurance-Backed Guarantee was included as standard."

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At a Glance Comparison

Flat Roofing FAQs

Which flat roof system is best for my extension?

How long do flat roofs last?

Can I walk on my flat roof?

How much does a flat roof cost?

What causes flat roofs to leak?

Can you install a flat roof in winter?

What Our Customers Say

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