Repair or replace
Repair or Replace Your Flat Roof?
A flat roof repair costs €250 to €900; replacing a 25 to 40 m² extension roof €3,000 to €6,500. Repair one fault on a sound roof; replace when the deck is soft or the covering has failed all over.
When a repair is enough, when it's time, and the middle way.
Free, no obligation. One local company prices it, not five.
When a repair is enough
- One leak, in one place, with the rest of the roof sound and firm underfoot.
- A blister or a split lap in felt that's otherwise in good order.
- A flashing pulled away from the wall.
- A blocked or leaking outlet.
When it's time for a new roof
- Soft or springy spots: the deck is wet or rotten.
- Leaks in several places, or the same one again after a repair.
- Felt cracked and crazed all over, or GRP cracked along several joints.
- Water that sits for days because the fall is lost.
- The room below is cold or has condensation, and you want it insulated anyway.
Repair, overlay or replace
| Job | Typical cost | What moves the price |
|---|---|---|
| Repair: a leak, a blister or a split seam | €250 to €900 | Finding it; the state of the roof around it |
| New membrane over the old roof | €1,800 to €5,000 | Only over a dry, sound deck |
| 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 |
An overlay lays a new membrane over the existing roof. It only works if the deck underneath is dry and sound. Over a wet deck it seals the water in.
Flat roof jobs we cover
Flat roof replacementExtensions, garages and dormers. €3,000 to €6,500 on a kitchen extension.More on flat roof replacement →
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
Is it worth repairing an old felt roof?
Once, for one fault, often yes. If it's the second or third repair in a few years, get a replacement price as well and compare.
How do I know if the deck is rotten?
Soft or springy spots underfoot, a sagging ceiling below, or a roofer's probe going into the boards. Don't test it by walking on it yourself.
Can I replace part of a flat roof?
On a roof with separate sections, sometimes. On one continuous roof, a new membrane goes over the whole of it.
Get a free price for your flat roof
One local flat roofing company, a look at the roof, a written price. Free, no obligation.