GRP · fibreglass flat roofs · all 26 counties
Fibreglass Roofing in Ireland
Felt that's blistered, a garage roof that leaks, or a balcony you want to walk on? A GRP roof is one hard surface with no seams. Tell us the job and one local company rings you with a written price.
Free, no obligation. One local company prices it, not five.
- €2,800 to €6,500a GRP flat roof on a garage or extension
- €75 to €140a square metre of GRP, laid
- 25 to 35 yearshow long a well-laid GRP roof lasts
- 2.0%of Irish houses on the BER have a flat main roof
Free quote
Get a price in 4 taps
Tap what you need and leave your number. It goes to one flat roofing company that covers your county, and they ring you back to arrange a look and a written price.
How it works
- 1Tell us the jobFour taps: the job, the roof, its rough size and the county. Or upload a photo.
- 2We match you with one local companyOne local flat roofing company that covers your area and lays GRP. Not a list.
- 3They ring you with a priceThey look at the roof and give you a written price: deck, mat weight, topcoat, trims, outlets and VAT.
What a GRP roof costs in Ireland
Typical prices for the whole job in Ireland this year. The written price comes after a look at the roof.
| Job | Typical cost | What moves the price |
|---|---|---|
| A GRP flat roof, garage or extension | €2,800 to €6,500 | Size, a new deck, trims on every edge, the outlet |
| GRP on a kitchen extension, 30 to 40 m² | €3,800 to €6,500 | The upstand at the house wall, rooflights |
| Warm GRP roof over a heated extension, 35 to 50 m² | €6,000 to €9,500+ | Insulation boards and taller trims |
| Single garage, 15 to 25 m² | €1,800 to €5,200 | GRP sits in the upper half of this range |
| Dormer, bay top or balcony | €2,800 to €6,000 | Access at first-floor height; the heavier mat on a balcony |
| GRP over the old roof | €1,800 to €5,000 | Only over a dry, sound deck |
| Repair: a crack, a trim, an outlet | €250 to €900 | Finding it; a dry day to re-laminate |
| New OSB3 deck where the old one has rotted | €30 to €50 a m² extra | How much of it is soft |
Roofing work on a house is at 13.5% VAT.
What's included
- The old felt off and into a skip
- A new OSB3 deck, or new boards where the old ones are soft
- Resin and glass mat, laminated in one go on a dry day
- GRP trims on every edge and an upstand at the house wall
- The topcoat, outlets, and a water test before they leave
What pushes it up or down
- Small roofs cost more a m²: trims and set-up are the same
- A rotten deck or joists found once the felt is off
- Insulation for a warm roof over a heated room
- Rooflights, lanterns, walls on three sides
- Access: dormers and balconies at first-floor height
- Dublin runs 15 to 25% above rural prices
GRP jobs we cover
Garages, extensions, dormers, bays and balconies: the flat roofs on Irish houses.
New GRP roofsStrip the old roof and lay GRP. €75 to €140 a m².More on new grp roofs →
GRP over an existing roofOnly over a dry, sound deck. €1,800 to €5,000.More on grp over an existing roof →
Garage roofsThe commonest roof to go over to GRP. €1,800 to €5,200.More on garage roofs →
Extension roofsWith insulation over a heated room. €3,800 to €6,500 for 30 to 40 m².More on extension roofs →
Dormers and balconiesSmall roofs with lots of edges, and roofs you stand on.More on dormers and balconies →
GRP roof repairCracks, trims, outlets. €250 to €900.More on grp roof repair →What a GRP roof costs for your size
One tap: roughly how big the roof is. The deck, trims, outlets, insulation and access move the price.
Your roof area × the typical GRP rate
€2,250 to €4,200
30 m² at €75 to €140 a m² for GRP, laid with trims. An estimate, not a quote.
- A GRP roof on a 30 to 40 m² kitchen extension is €3,800 to €6,500 for the whole job.
- A rotten deck adds €30 to €50 a m².
- Roofing work on a house is at 13.5% VAT, not 23%.
One sheet, no seams, and you can walk on it
A fibreglass roof is laid wet on the roof itself. The roofer coats a new timber deck with resin, rolls glass fibre mat into it, lets it cure hard, then adds a coloured topcoat and pre-formed GRP trims at the edges. There are no seams or laps to open up, and the cured roof takes foot traffic. It suits small, detailed roofs well because the corners and upstands are made in the same material as the roof. How a GRP roof is laid goes layer by layer.
| Membrane | Typical rate, laid | Life and the trade-off |
|---|---|---|
| GRP fibreglass | €75 to €140 a m² | 25 to 35 years; hard and walkable |
| EPDM rubber | €70 to €140 a m² | 20 to 50+ years; one flexible sheet |
| Torch-on felt | €55 to €90 a m² | 10 to 25 years; lowest cost |
Fibreglass roofing in every county
- Carlow1.4% flat main roofs
- Cavan0.8% flat main roofs
- Clare1.2% flat main roofs
- Cork2.5% flat main roofs
- Donegal1.0% flat main roofs
- Dublin3.0% flat main roofs
- Galway1.2% flat main roofs
- Kerry1.8% flat main roofs
- Kildare1.0% flat main roofs
- Kilkenny1.4% flat main roofs
- Laois1.2% flat main roofs
- Leitrim1.2% flat main roofs
- Limerick1.6% flat main roofs
- Longford0.9% flat main roofs
- Louth2.3% flat main roofs
- Mayo2.3% flat main roofs
- Meath1.3% flat main roofs
- Monaghan0.9% flat main roofs
- Offaly1.3% flat main roofs
- Roscommon1.2% flat main roofs
- Sligo1.4% flat main roofs
- Tipperary1.6% flat main roofs
- Waterford2.2% flat main roofs
- Westmeath1.5% flat main roofs
- Wexford2.7% flat main roofs
- Wicklow2.7% flat main roofs
Questions people ask
How much does a fibreglass roof cost in Ireland?
A GRP flat roof on a garage or extension costs €2,800 to €6,500, and €3,800 to €6,500 on a 30 to 40 m² kitchen extension. Laid, GRP runs €75 to €140 a m². The cost guide breaks it down.
Is GRP the same as fibreglass?
Yes. GRP is glass-reinforced polyester: glass fibre mat set in resin and finished with a coloured topcoat. Roofers use both names for the same roof.
How long does a fibreglass roof last?
25 to 35 years when it's laid on a sound deck in dry weather. See how long it lasts.
Can GRP go over my old felt roof?
Sometimes, if the deck underneath is dry and sound: €1,800 to €5,000. See GRP over an existing roof.
What if it rains on the day?
Nothing goes down in the wet: GRP laid on a damp deck fails. A good roofer keeps a sheet on site, stops, covers the roof and comes back on the next dry day.
Will there be a smell?
Yes, while the resin and topcoat cure, for a day or so. Keep windows near the roof shut while it's laid; it goes once the roof has cured.
What guarantee do I get?
Ask for two in writing: the roofer's workmanship guarantee (10 years is common for a good one) and the material guarantee on the GRP system (often 20 to 25 years).
Who comes out to look at the roof?
One flat roofing company that covers your county. One company only, not a list. Fibreglass Roofing is run by Bartlomiej Standa, trading as Elevate Ireland: we don't do the roofing ourselves.
Get a free price for a GRP roof
One local flat roofing company, a look at the roof, a written price. Free, no obligation.