Fibreglass Roofing guides, calculator & reference
Every fibreglass roofing cost guide, specification comparison, interactive calculator, FAQ and technical glossary on fibreglassroofing.ie in one place.
Browse the guides below or jump straight to the interactive calculator on the homepage.
Free, no obligation. One local company prices it, not five.
Core fibreglass roofing guides
Detailed guides covering prices, specifications and what to check before you book.
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 →Calculators, FAQ and glossary
| Resource | What's inside | How it helps |
|---|---|---|
| Interactive Cost Calculator | Live price range | Select your specification options to get an instant Irish guide price. |
| Master FAQ Hub | 14 questions answered | Straight answers on pricing, preparation, timelines, rules and aftercare. |
| Technical & Trade Glossary | 15 terms defined | Plain-English definitions of every fibreglass roofing specification and standard. |
| All 26 Counties Index | 26 county pages | Local housing data and one flat roofing company that covers your county. |
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
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.
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.
Every guide, calculator and county page
Jump straight to any specification guide, our interactive calculator, the technical glossary or your county page.
Price & Specification Guides
Calculator, FAQ & Glossary
Get a free price for a GRP roof
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