Flat roofing Swindon
Flat roof specialists
Swindon & Wiltshire
EPDM rubber flat roofing for extensions, garages, bay windows and commercial properties. Up to 25-year manufacturer warranty. Free survey.
EPDM Rubber — Up to 25-Year Warranty◆Free Survey, No Obligation◆Garages, Extensions & Bay Roofs◆10-Year Workmanship Guarantee◆Correct Falls & Drainage Every Time◆EPDM Rubber — Up to 25-Year Warranty◆Free Survey, No Obligation◆Garages, Extensions & Bay Roofs◆10-Year Workmanship Guarantee◆Correct Falls & Drainage Every Time◆
Instant flat roof price
Get your flat roof price
in 3 quick questions
No technical jargon — just simple questions anyone can answer in under 2 minutes.
Free2 mins
Where
Size
Condition
Your details
Where is the flat roof?
Just tap the one that matches your property — this is all we need to know
Garage roof
Detached or attached garage
House extension
Single-storey rear or side
Bay window or porch
Small roof over a bay or entrance
Upper floor or commercial
Above ground floor or business premises
Outbuilding or workshop
Garden room, log cabin, shed
Something else
We'll work out the details
How big is the flat roof area?
Tap the size that's closest, or type rough measurements below — don't worry about being exact, we'll measure precisely at survey
Small
Up to 12 m²
Medium
12 – 30 m²
Large
30 – 60 m²
— or type rough measurements if you know them —
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What's the current roof like?
This helps us estimate if any extra preparation work is needed
✨
It's new — bare boards ready to be covered
New build or fresh decking already fitted
Best value
👍
It's getting old but isn't leaking
Old felt or rubber, worn but holding up
Standard
💧
It's leaking or blistering
Water is getting in or bubbles have formed
May need extra prep
😬
The boards feel soft or rotten
You can feel it moving when you walk on it
Board replacement likely
🤷
Not sure — just needs replacing
We'll check everything at survey
We'll check
Almost there — where shall we send your price?
We'll show you the price straight away and email a full written quote
Your JK Roofing flat roof estimate
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🏆 Our promise: When we visit or verify your roof, if it comes in smaller than estimated, we'll always honour the lower price.
How would you like to confirm your price?
Free in-person survey
We visit, measure up properly and confirm your exact price. Usually within 48 hours.
✓ Free · No obligation
Satellite verification
No visit needed — we measure using aerial imagery and send your written quote by email within 5–7 working days.
✓ No visit required
Price breakdown
EPDM rubber membrane & adhesives—
Labour (strip & install)—
Trims, sealants & waste removal—
Estimated total—
🛡 25-year EPDM membrane warranty + 10-year JK Roofing workmanship guarantee on all flat roof installations.
Estimate based on answers. Exact price confirmed at survey or via satellite measurement. JK Roofing, Swindon.
Flat roofing systems
EPDM, fibreglass or felt?
"Flat roof" covers several very different systems. Here's how the main ones compare, and which we'd recommend for your garage, extension or dormer.
Our recommendation
EPDM rubber
Typical lifespan30–50 years
Relative cost££
- A single rubber sheet — seamless on most roofs
- Stays flexible in heat and cold, won't crack
- Manufacturer warranties up to 20–25 years
- The best all-round choice for most flat roofs
Walk-on / hard-wearing
GRP fibreglass
Typical lifespan25–30 years
Relative cost£££
- Seamless, rock-hard finish
- Ideal for balconies and walk-on terraces
- Crisp, neat trims and detailing
- Needs dry, warm conditions to install
Budget option
Torch-on felt
Typical lifespan15–20 years
Relative cost£
- Modern 3-layer high-performance felt
- Lowest upfront cost
- Proven, widely used system
- Shorter life and more seams than EPDM/GRP
Complex shapes
Liquid waterproofing
Typical lifespan20–25 years
Relative cost££
- Brushed/rolled on — totally seamless
- Perfect for awkward shapes and pipework
- Bonds over many existing surfaces
- Great for roofs with lots of detail
Built to last
More than just the covering
Two things separate a flat roof that lasts decades from one that fails early — and they're under the surface.
🔥Warm roof construction
On a warm roof the insulation sits above the timber deck, keeping the structure warm and dry and preventing the hidden condensation that rots cold-roof decks from below. It's now the recommended approach under current Building Regulations, and what we build on new flat roofs and extensions.
📐Falls & drainage
A "flat" roof is never truly flat — it's built with a slight fall so rainwater runs off to the gutter or outlet instead of pooling. Standing water is the number-one killer of flat roofs. We design the correct fall into every roof, adding firrings or tapered insulation where needed.
Flat roofing questions
Your questions, answered
Which flat roof system is best?
For most homes we recommend EPDM rubber — it's seamless on most roofs, stays flexible in any weather and lasts 30–50 years. For a balcony or terrace you'll walk on regularly, GRP fibreglass is the tougher choice. Felt is the budget option. We'll advise the best fit at your free survey.
How long does an EPDM rubber roof last?
A well-installed EPDM roof typically lasts 30–50 years, with manufacturer membrane warranties of up to 20–25 years. On top of that, JK Roofing provides a 10-year written workmanship guarantee. Because it's a single flexible sheet, there are no seams to split as the temperature changes.
What's the difference between EPDM, GRP and felt?
EPDM is a flexible rubber sheet — best all-rounder, very long life. GRP (fibreglass) sets into a hard, seamless shell — ideal for walk-on roofs and balconies. Felt is a layered bitumen system — cheapest upfront but with more seams and a shorter life. We fit all three and match the system to the job.
What is a warm roof?
A warm roof has the insulation placed above the roof deck rather than between the joists below it. This keeps the deck warm and dry, prevents hidden condensation, and is the construction now recommended under Building Regulations. It's what we build on new flat roofs and single-storey extensions.
Do flat roofs need a slope?
Yes — every flat roof is built with a slight fall so water drains away rather than pooling. Standing water is the most common cause of flat-roof failure. Where the existing structure is dead level, we build the fall in with firring strips or tapered insulation.
Can you walk on a flat roof?
EPDM and GRP both take occasional foot traffic for maintenance. If you want a roof you'll use regularly — a balcony, terrace or roof you'll sit out on — we'll specify a proper walk-on GRP or a protected/paved finish designed for the load. Just tell us how you plan to use it.
Why does my old flat roof keep leaking?
Most older flat roofs are felt, which becomes brittle and cracks at the seams and upstands as it ages — and patch repairs rarely hold for long. Modern seamless systems like EPDM and GRP remove the weak points, which is why a full replacement usually works out cheaper than repeated repairs.
Related services
Flat roof specialists Swindon.
Free survey, 25-year warranty.
No obligation, no jargon — just a proper price from people who know roofs.