Flat Roof Replacement Swindon
Flat roof replacement is the right solution when repair is no longer cost-effective — when a roof is broadly deteriorated, repeatedly leaking, or simply at the end of its serviceable life. Across Swindon and Wiltshire, we replace ageing felt, EPDM, and GRP fibreglass roofs with modern systems that will last 25–50 years with minimal maintenance.
At Flat Roof Swindon, we handle the full replacement process from strip-off and deck inspection through to installation and final sign-off, with transparent pricing and written quotes before any work begins.
When Replacement Makes More Sense Than Repair
A large number of homes across Swindon — particularly on the estates built through the 1970s, 1980s, and 1990s in areas like Walcot, Penhill, and Park South — were fitted with traditional felt roofs on garages and extensions that are now well past their intended lifespan. Signs that replacement is the right call include:
- Repeated leaks in different locations across the same roof
- Widespread blistering or cracking across the felt surface
- Visible sagging or structural movement in the roof deck
- A roof that is over 20 years old with no previous replacement
- Repair quotes that represent more than 50% of a full replacement cost
We will always give you an honest assessment — if a repair will genuinely solve the problem for several more years, we will tell you. We do not recommend replacement when it is not necessary.
Our Flat Roof Replacement Process
- Survey and assessment — We inspect the existing roof in full, including the deck beneath the membrane. Rot, inadequate falls, and structural issues are identified before we quote.
- System recommendation — We present options across EPDM, GRP fibreglass, and felt, with honest guidance on cost, lifespan, and suitability for your building and budget.
- Strip and prepare — The existing membrane is fully removed and the deck is inspected, repaired where necessary, and prepared to the correct standard before the new system goes down.
- Installation — The new roofing system is installed to manufacturer specifications or BS 8217 for felt, including correct insulation, falls, and drainage.
- Inspection and warranty — We walk you through the completed installation and provide full warranty documentation.
Flat Roof Replacement Costs in Swindon
Replacement costs depend on roof size, system type, and the condition of the existing deck. As a general guide:
- Traditional felt replacement: £40–£60 per m²
- EPDM rubber replacement: £60–£90 per m²
- GRP fibreglass replacement: £70–£100 per m²
A standard garage roof of 15–20 m² typically costs between £900 and £2,000. A larger extension roof of 30–40 m² will typically range from £2,000 to £4,000. Deck repairs, if required, are quoted separately and discussed with you before proceeding.
Frequently Asked Questions
How long does a flat roof replacement take?
Most garage and extension roofs are completed within one to two days. Larger or more complex projects — particularly where deck repairs are needed — may take three to four days. We aim to complete all work in a single visit to limit weather exposure to the building.
Do I need planning permission for a flat roof replacement in Swindon?
Replacing a like-for-like flat roof on an existing structure is generally covered by permitted development rights and does not require planning permission. If your property is in a conservation area or is listed, you should confirm with Swindon Borough Council before work begins. Parts of Swindon Old Town fall within conservation area boundaries.
Which system should I choose for my replacement?
For most residential replacements in Swindon, we recommend EPDM or GRP fibreglass over traditional felt. Both offer significantly longer lifespans — 25–50 years versus 10–20 years for felt — and require less maintenance. GRP is particularly well suited to roofs with complex details such as upstands, outlets, and abutments. We will guide you through the options at survey stage.
What happens if the roof deck is damaged?
If we find rot or structural damage to the deck during strip-off, we will stop work and discuss the findings with you before proceeding. Deck repairs are quoted and approved separately — we never carry out additional work without your agreement.
Areas We Serve
We carry out flat roof replacements across Swindon and the surrounding area, including Chippenham, Royal Wootton Bassett, Devizes, and Marlborough. If you are outside these areas, get in touch — we cover most of Wiltshire.
Get a Free Quote Today
We provide free, no-obligation written quotes for all flat roof replacement projects across Swindon and Wiltshire. For independent guidance on roofing standards and contractor selection, visit the National Federation of Roofing Contractors. Call us today to arrange a survey.