Flat Roof Cost in Cork 2026: EPDM, Fibreglass & Felt Prices

Flat roofs are everywhere in Cork — kitchen and bedroom extensions, garages, dormers and the odd full flat-roofed house. They’re also where a lot of leaks start, which is why “what does a flat roof cost?” is one of the questions I get asked most.

I’m Michael Casey, founder of Keystone Roofing. We fit and repair flat roofs across Cork City and County every week. Below are the honest 2026 ranges we quote, broken down by system, so you can budget before anyone climbs up. Every figure excludes VAT — always check whether a quote you’re comparing is ex-VAT or inc-VAT.

How much does a flat roof cost in Cork?

For a typical extension or garage flat roof, expect €90–€170/sqm ex-VAT supplied and fitted, before scaffolding. A small repair — sealing a split, a blistered patch or a failed upstand — usually starts from a couple of hundred euro. The price hinges on the covering you choose and what the team finds when the old covering comes off.

Whether you’re repairing or recovering, the same rule applies as with any roof: a single-line “flat roof — €X” quote tells you nothing. You want the system named, the deck spec stated, and the trims and upstands itemised. For pitched-roof pricing, see our cost of a new roof in Cork 2026 guide.

Flat roof cost by system (EPDM, fibreglass, felt)

The covering you choose sets most of the price and almost all of the lifespan. Here are the 2026 ranges we quote across Cork, ex-VAT, supplied and fitted:

System	Cost per sqm (ex-VAT)	Typical lifespan	Best for
EPDM rubber (single-ply)	€90–€140	20–30 years	Extensions, dormers, garages
Fibreglass / GRP	€110–€170	25–30 years	Seamless, hard-wearing finish
Felt (3-layer torch-on)	€55–€90	10–15 years	Tight budgets, short stay

EPDM is our default recommendation for most Cork extensions — it comes in large single sheets that minimise joins, handles Atlantic weather well, and carries a long manufacturer warranty. Fibreglass gives a hard, seamless finish where the edge detailing allows. Felt is cheapest but shortest-lived. For a full fit, see flat roof repairs and installation in Cork.

What affects the price?

Two flat roofs of the same size can be hundreds of euro apart, and both can be fair. The swing factors:

• Deck condition — if the OSB or timber deck under the old covering has gone soft, it has to be replaced before the new system goes down. This is the single biggest variable.
• Access — a ground-floor garage is cheaper than a second-storey dormer needing scaffolding.
• Detailing — upstands into the house wall, around rooflights, and perimeter trims all add labour.
• Drainage — correcting falls so water actually runs off (rather than ponding) adds cost but saves the roof.

Should you repair or replace your flat roof?

If the covering is generally sound and the leak is local — one split, a blistered area, a failed seam — a targeted repair is the right call and the cheaper one. If the felt has perished across the whole roof, there are multiple splits, or the deck underneath is soft, a re-cover in EPDM or fibreglass costs more up front but ends the annual patching. We’ll tell you honestly which one your roof needs after the inspection.

How long will a flat roof last?

Lifespan is where the cheap option gets expensive. Felt lasts 10–15 years; EPDM 20–30; fibreglass 25–30. If you’re staying in the house, the maintenance cost of felt over 20 years usually overtakes the price of an EPDM install done once. If you’re selling within a few years, felt can still make sense. Either way, a flat roof that ponds water will fail early regardless of the system — getting the falls right matters as much as the covering.