How Much Does a Flat Roof Repair Cost in 2026? (UK)
A flat roof repair in the UK costs roughly £150–£600 for a small patch, leak or flashing repair in 2026 — or £1,000–£2,500 to re-felt a small flat roof such as a garage or extension. A full replacement runs £80–£130 per m² depending on whether you choose felt, EPDM rubber or GRP fibreglass. The big cost drivers are the type of damage, roof size, covering material and access. This guide breaks down every line of the price and where you can safely save.
A small patch, leak or flashing repair costs £150–£600. Re-felting a small flat roof (garage/extension) costs £1,000–£2,500. A full replacement costs £80–£130/m² — felt is cheapest, GRP fibreglass and EPDM rubber cost more but last 20–30 years. Emergency call-outs add £150–£300.
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Flat Roof Repair Cost by Job (2026)
Typical supplied-and-fitted prices on a standard single-storey flat roof with reasonable access.
Job
Typical cost
Minor patch / blister repair
£150–£400
Leak or flashing repair
£200–£600
Re-felt small flat roof (garage/extension)
£1,000–£2,500
Full replacement (felt)
£40–£80/m²
Full replacement (EPDM rubber)
£80–£120/m²
Full replacement (GRP fibreglass)
£90–£130/m²
Rule of thumb in 2026: a quick repair pays off if the roof is otherwise sound, but if the covering is past 15–20 years old or patched repeatedly, a full re-cover usually works out cheaper per year of life.
What You Pay For
Where the Money Goes
Inspection & diagnosis (£0–£150). Many roofers fold this into the quote, but a leak trace on a complex roof can be charged separately.
Materials (£10–£40/m²). Felt is cheapest; EPDM rubber and GRP fibreglass cost more but last far longer and resist ponding water better.
Labour (£200–£300/day). A two-person team can patch or re-felt a small roof in a day; a full strip and re-cover takes longer.
Access & scaffolding (£0–£800). Ground-floor roofs need little; a first-floor or hard-to-reach roof may need a tower or scaffold.
Stripping & disposal (£100–£400). Removing old felt and decking and skip hire for a full replacement.
Decking & insulation (extra). Rotten timber decking or upgrading to a warm-roof build-up adds to a full replacement.
Frequently Asked
Common Questions
A localised leak or flashing repair usually costs £200–£600 depending on access and the cause. If the leak is from a failed covering rather than a single split, re-felting or re-covering the whole roof (£1,000+) is often the better long-term fix.
If the roof is sound and the damage is localised, a repair at £150–£600 is far cheaper. But once a covering is 15–20 years old or has been patched several times, a full replacement at £80–£130/m² usually costs less per year of life and stops repeat call-outs.
A patch repair on an otherwise good roof can last several years. A full EPDM rubber or GRP fibreglass re-cover lasts 20–30 years, while traditional felt lasts around 10–20 years depending on quality and drainage.
EPDM rubber and GRP fibreglass are the most popular long-life options — both resist ponding water and UV better than felt. EPDM is quick to install in a single sheet; GRP gives a hard, seamless finish. Felt is cheapest upfront but has the shortest life.
A like-for-like repair doesn't. But if you re-cover more than 25% of the roof area, building regulations usually require the insulation to be upgraded to current standards — your roofer should factor this into a full replacement quote.
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