Flat roofs are typical on homes in Trowbridge, especially on garages, porches, and extensions. Over time, weather, standing water, and worn materials can cause leaks and damage. Minor problems often become bigger ones if left untreated.
Knowing the flat roof replacement cost in Trowbridge helps homeowners plan the work properly and avoid last-minute expenses. The cost depends on the roof’s size, the material used, and the ease of access. As experienced roofers in Trowridge, we will explain the prices using local examples.
Average Flat Roof Replacement Cost in Trowbridge
In Trowbridge, the cost to replace a flat roof usually ranges from £1,500 to £7,500. Smaller roofs, such as porches or sheds, are at the lower end, while larger extensions cost more.
Most homeowners pay around £70 to £120 per square metre. The final price depends on several factors, including the roof size, the chosen material, and whether scaffolding is needed.
Prices can also change if the old roof has damage underneath. Rotten boards or wet insulation must be replaced before the new roof is fitted, which increases the total cost.
Flat Roof Replacement Prices by Size
Below is a simple guide to flat roof replacement costs in Trowbridge based on common roof sizes.
| Flat Roof Type | Average Size | Typical Cost Range |
| Porch / small flat roof | 6–10 m² | £600 – £1,200 |
| Garage flat roof | 15–20 m² | £1,200 – £2,500 |
| Extension flat roof | 20–35 m² | £2,000 – £4,500 |
| Large flat roof | 40+ m² | £4,500 – £7,500 |
These prices include materials and labour. Costs can increase if access is difficult, scaffolding is required, or the old roof deck is damaged and needs to be replaced. A roofer in Trowbridge can assess the roof properly and recommend a solution that suits the property, not just the budget.
Factors Affecting Flat Roof Replacement Cost
Several local and practical factors affect the final price of a flat roof replacement.
- Size of the flat roof
Larger roofs need more materials and take longer to install. - Type of flat roofing material
Felt is usually cheaper, while EPDM and fibreglass cost more but last longer. - Condition of the existing roof
If the timber deck or insulation is damaged, it must be replaced. - Access and scaffolding
Tight access or higher roofs often need scaffolding, which adds to the cost. - Local labour costs
Prices in Trowbridge reflect local labour rates, not national averages. - Waste removal
Old felt, boards, and insulation must be removed and disposed of safely.
Flat Roof Material Costs in Trowbridge
Felt Flat Roof Cost
- Cost per m²: £50 – £70
- Typical lifespan: 10–15 years
- Best use cases: Garages, sheds, and budget-friendly projects
Felt roofing is one of the most affordable options. Modern felt is stronger than older types, but it still needs regular checks.
Make sure to hire professional flat roof replacement services if you are planning a roof replacement in Trowbridge.
EPDM Rubber Flat Roof Cost
- Cost per m²: £70 – £90
- Durability: 20–30 years
- Why homeowners choose it: Flexible, low maintenance, strong against the weather
EPDM is popular in Trowbridge because it handles rain well and has fewer joints.
Fibreglass (GRP) Flat Roof Cost
- Cost per m²: £80 – £110
- Strength and finish: Hard surface with a clean, smooth look
Fibreglass roofs are tough and long-lasting. They work best on roofs with a simple shape.
Single Ply Flat Roof Cost
- Cost per m²: £75 – £100
- When it makes sense: Larger flat roofs or modern extensions
Single-ply systems are lightweight and quick to install when access is good.
Conclusion
The flat roof replacement cost in Trowbridge usually ranges from £1,500 to £7,500, depending on the roof size, material used, and the condition of the existing structure. Smaller roofs cost less, while larger extensions and higher-quality materials increase the price.
Choosing the right material and fixing problems early can save money in the long run. A well-fitted flat roof lasts longer, needs fewer repairs, and offers better protection against leaks. For the most accurate price, it is always best to get a local quote.
FAQs
How much does a flat roof cost per m² in Trowbridge?
The cost per m² depends on the material and roof size. Felt roofs can be around £40–£80 per m², EPDM rubber £60–£100 per m², and fibreglass or single ply roofs slightly higher. Labour and access can affect the total cost.
Is EPDM cheaper than felt?
EPDM rubber roofs usually cost more upfront than felt, but they are more durable, low-maintenance, and last longer. Felt is cheaper but may need repairs or replacement sooner. EPDM can save money over time despite a higher initial cost.
How long does a flat roof last?
The lifespan depends on the material and installation. Felt roofs last around 15–20 years, EPDM rubber and fibreglass can last 25–30 years, and single ply roofs last 20–30 years. Proper maintenance can significantly extend the life of any flat roof.
Is replacement better than repair?
Replacement is usually better if the roof has multiple leaks, severe damage, or is old. Minor damage or small leaks can be repaired, but frequent repairs may cost more than a complete replacement over time.
Are flat roofs more expensive than pitched roofs?
Flat roofs are usually cheaper to install than pitched roofs because they require less material and can be installed more quickly. However, maintenance and lifespan can affect overall costs. Quality materials and professional installation ensure flat roofs remain cost-effective in the long term.
