Cost guide
Flat Roof Replacement Cost in Ireland
A new flat roof on a 25 to 40 m² kitchen extension costs €3,000 to €6,500, a single garage €1,800 to €5,200 and a porch or dormer €1,800 to €2,800. Laid, felt runs €55 to €90 a m², EPDM €70 to €140 a m² and GRP €75 to €140 a m².
What moves the price, what a written quote should list, and what it costs where you live.
Free, no obligation. One local company prices it, not five.
What a new flat roof costs for your size
Two taps: the membrane and roughly how big the roof is. The deck, insulation, rooflights and access move the price.
Your roof area × the typical rate
€2,100 to €4,200
30 m² at €70 to €140 a m² for epdm rubber, laid. An estimate, not a quote.
- A kitchen extension, 25 to 40 m², is €3,000 to €6,500 for the whole job.
- A rotten deck adds €30 to €50 a m².
- Repair and roofing work on a house is at 13.5% VAT, not 23%.
By roof and size
| Job | Typical cost | What moves the price |
|---|---|---|
| Porch, bay or dormer, 8 to 12 m² | €1,800 to €2,800 | Small roofs cost more a m²: the set-up, trims and access are the same |
| Single garage, 15 to 25 m² | €1,800 to €5,200 | Felt costs least; EPDM lasts longer |
| Kitchen extension, 25 to 40 m² | €3,000 to €6,500 | The membrane, a new deck, rooflights, the wall upstand |
| Large extension, 40 to 60 m² | €4,500 to €8,500 | Size, insulation, outlets and access |
| Warm roof on a heated extension, 35 to 50 m² | €6,000 to €9,500+ | Insulation boards, vapour control, taller trims |
| New membrane over the old roof | €1,800 to €5,000 | Only over a dry, sound deck |
| Repair: a leak, a blister or a split seam | €250 to €900 | Finding it; the state of the roof around it |
| New deck where the old one has rotted | €30 to €50 a m² extra | How much of it is rotten |
Whole-job prices. Roofing work on a house is at 13.5% VAT.
What it costs a square metre
Small roofs cost more a m² than these rates: access, trims, outlets and the day's set-up cost much the same on 8 m² as on 30 m².
| Membrane | Typical rate, laid | Life |
|---|---|---|
| Torch-on felt | €55 to €90 a m² | Lasts 10 to 25 years |
| EPDM rubber | €70 to €140 a m² | Lasts 20 to 50+ years |
| GRP fibreglass | €75 to €140 a m² | Lasts 25 to 35 years |
| Single-ply PVC or TPO | €80 to €130 a m² | Lasts 20 to 35 years |
| Warm roof system | €130 to €190 a m² | Insulation above the deck |
| Zinc | €150 to €240 a m² | Lasts 60 to 80 years |
Dublin and the rest
A typical flat roof job, by where you are.
| Where | Typical job | Against rural prices |
|---|---|---|
| Dublin | €3,800 to €10,500 | 15 to 25% above rural prices |
| Cork | €3,500 to €9,500 | Cork city 3 to 8% above rural prices |
| Galway | €3,200 to €9,000 | Galway city 3 to 8% above rural prices |
| The commuter belt | €3,000 to €8,500 | Kildare, Meath, Wicklow and Louth: 5 to 15% above rural prices |
| The rest of Ireland | €3,000 to €8,500 | The national baseline |
What the written price should list
- The membrane, the make and the system, and whether it's an overlay or a strip and replace.
- The area in m².
- Whether the deck is replaced, all of it or only rotten boards, and the rate if more is found.
- Insulation: type and thickness, or none.
- Edge trims, outlets, flashings at the wall, and any rooflights.
- Skip, VAT, and the guarantee in writing: who gives it, for how long, and on what.
Flat roof jobs we cover
Flat roof repairLeaks, blisters, split seams, outlets. €250 to €900.More on flat roof repair →
EPDM rubber roofsOne sheet, no flame. €70 to €140 a m² laid.More on epdm rubber roofs →
GRP fibreglass roofsHard and walkable. €75 to €140 a m² laid.More on grp fibreglass roofs →
Torch-on felt roofsThe lowest cost. €55 to €90 a m² laid.More on torch-on felt roofs →
Warm flat roofsInsulation above the deck. €130 to €190 a m².More on warm flat roofs →Flat roofs 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
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.
Questions people ask
Why do flat roof prices vary so much?
Size, material, the state of the deck, insulation, access and how many details there are: rooflights, outlets, a wall on three sides. A garage with clear access is a different job from a roof over a kitchen with a lantern in it.
Is a cheaper quote missing something?
Often the deck, insulation, trims, the skip or VAT. Ask for every item in writing, so you compare the same job.
Is it cheaper to lay a new membrane over the old one?
Sometimes: an overlay is €1,800 to €5,000. It only works over a sound, dry deck; over a wet or rotten one it traps the problem.
Does flat roof work carry 23% VAT?
No. Repair and roofing work on a house is at the 13.5% rate.
Get a free price for your flat roof
One local flat roofing company, a look at the roof, a written price. Free, no obligation.