Flat roofs in Dublin that stay dry.
Most owners learn their flat roof has failed when a ceiling stains. The roof gave up long before that, and nobody could see it from the ground.
A flat roof is only flat on paper
A properly built flat roof has a fall: a gentle slope to an outlet so the water leaves. One that has lost its fall holds a pond, and a pond finds every weakness in the covering. Felt that has blistered, lifted at the edges or split along the seams is the usual cause, and from the garden none of it can be seen.
Our Blackrock job is a fair example. A felt roof had broken down and water had reached the rooms beneath, which made two problems: close the roof, then repair the damage indoors. We dealt with the roof, repairing and replacing it, and did the interior repair as well. Water travels, so a mark on the ceiling means the leak is already established, and the cost has spread beyond the roof.
In Dublin flat roofs sit over rear extensions, garages, dormers and bay windows on houses of every age, as well as on apartment blocks. We lay them in EPDM, a single-ply rubber membrane, or in GRP, a glass-fibre laminate that cures into one seamless surface. Which one suits depends on the shape of the roof, how often people walk on it and what it must be fixed to.
Both need detail work at the edges: upstands against walls, trims at the drip edge and outlets set right. Most failures start there. If your roof is on a commercial building, see commercial roofing in Dublin.
How a flat roof can be done.
EPDM rubber membrane
One sheet cut to the roof, leaving very little to leak at the joins. Fast to fit and flexible, it works well for big, plain roofs.
GRP fibreglass
Laid in place as a laminate with a topcoat, it forms a hard seamless skin. It suits awkward shapes, small roofs and areas people walk on.
Felt roof repair
If the existing roof is broadly sound, we repair the affected area. If it is worn out, we say so, because patching only postpones the bill.
Falls, decking and insulation
Rotten decking is replaced and falls corrected before the new covering goes on, because a membrane laid on a bad base fails early.
Edges and outlets
Upstands, trims and rainwater outlets are rebuilt and sealed. This is where most flat roofs let go first.
What each price takes in.
The quote is one fixed sum, so the bill at the end matches the paper you signed.
Included in every job
Quoted separately
What this usually costs.
| Service | Indicative price (2026) | Typical duration |
|---|---|---|
| Flat Roof (EPDM / GRP) | €90–€140 per m² | 2–5 days |
Read these as 2026 guide figures, not a quote. The size and slope of a roof, what covers it, how safely we can reach it and what the timbers turn out to be like all move the number. The price you pay is the one written down after the survey, and VAT is added on top at 13.5% for homes.
From the first look to the handover.
Survey
We check the surface, the edges and outlets, and the ceiling below for signs of water.
Written price
The price is given per square metre against your measured roof, with the covering named.
Strip and prepare
Off goes the worn covering; the deck and the falls are inspected and put right.
Lay and finish
EPDM or GRP goes down with detailed edges. We check it drains and send the guarantee.
What people ask us.
Are you flat roofers in Dublin?
Yes. Flat roofs on extensions, garages, balconies and commercial units are a core part of the work, laid in EPDM or GRP. The survey is free and the price is fixed in writing, like every other job.
What do flat roofs cost around Dublin?
On our 2026 guide, EPDM or GRP runs €90–€140 per m² plus VAT and takes 2–5 days. The fixed price comes after a survey and depends on the size and the state of the deck.
EPDM or GRP: which is better?
Neither always wins. EPDM suits a large, simple roof with few seams. GRP suits awkward shapes and small roofs. We tell you which suits yours when we have seen it.
What are the warning signs on a flat roof?
Look for blisters, lifted seams, standing water and stains on the ceiling below. Many problems cannot be seen from the ground, which is why a survey from the roof is worth having.
Is a patch ever enough on a leaking flat roof?
Sometimes. If the felt is mostly sound and the damage is local, repair makes sense. Blistering across the whole roof means a repair just defers the replacement and you pay twice.
Will you fix the damage inside as well?
Plaster and decoration repair is quoted separately. We will tell you what the leak has reached, so you can get it made good and not find the mark again next winter.
How many years will a flat roof last?
That turns on the material, the workmanship and the base underneath. We will not promise a lifespan for the surface. What we give is ten years of written cover on the workmanship.
Is planning permission needed to renew a flat roof?
Replacing the covering of an existing roof generally does not need it, but changes to a protected structure or to the shape of the roof can. Check with your local authority if you are unsure.
Related roofing jobs.
Roof Inspections
A written report with photographs, taken on the slope and from inside the attic, so you know what the roof needs and what it does not.
Commercial Roofing
Shop, office, unit and apartment-block roofs with little or no pitch, kept watertight around a working week.
Roof Repairs
A stain on the ceiling or a slate on the path: the spot where water gets in is traced and put right, not painted over.
Best Roofers Dublin cover Dublin city and county. The survey is free, the price is fixed in writing, and the work carries a written guarantee.
Get your roof
looked at.
Tell us what the roof is doing and roughly where it is. Someone looks at it for free and a fixed written price comes after. Send the form, or ring.