Flat roofing in Dundrum usually comes down to a choice between EPDM rubber and GRP fibreglass, and the right one depends on your roof, your budget and how long you want it to last. This guide compares EPDM and GRP for the Irish climate, sets out real 2026 costs, and explains when to repair a flat roof and when to replace it.
Dundrum spreads out from the old village core across D14 and D16, and the housing stock is a real mix. You have Victorian and Edwardian terraces near the village, 1960s to 1980s semi-detached estates, and newer apartment blocks closer to the town centre.
Most of the flat roofing work we do in Dundrum sits on the semi-detached homes: rear kitchen extensions, garage roofs and box dormers added over the decades. A lot of these still carry old bitumen felt that has long since had its day, so they are prime candidates for EPDM or GRP.
Dundrum has moderate exposure but above-average rainfall, and that combination is hard on flat roofs. Standing water sits where the fall has gone flat, and winter freeze-thaw cycles crack tired felt and open up seams.
The failures we see most often here are ponding on old felt extensions, split seams around upstands and skylights, and blistering where the sun has cooked a black bitumen roof. Once water gets past the covering it tracks into the timber deck below, and a covering job turns into a structural one. Catching it early is everything on a flat roof.
Flat roofing is priced by the square metre and by the covering you choose. These are honest Dundrum ranges for 2026, and you get a written, fixed price after a free survey so there are no surprises at the end.
What moves the price is the size of the roof, the state of the deck underneath, access, and whether old coverings need stripping and disposal. A typical garage or single extension is a one to two day job once we start.
We start by working out whether you actually need a full replacement or a targeted repair. EPDM is a single sheet of rubber with very few joints, so it handles Irish rain and movement well and is our usual recommendation for extensions and garages. GRP fibreglass gives a harder, seamless finish that suits balconies and foot-traffic areas, though it is less forgiving of a moving timber deck. We talk you through both before anything is ordered.
We are a CIRI-registered contractor (Construction Industry Register Ireland), so you can check us independently before anyone sets foot on your roof. Every survey is done by a qualified roofer, not a salesperson, and you get a written condition report with a fixed-price quote within 48 hours. Most Dundrum flat roofs are completed in one to two days, we weatherproof anything urgent on the first visit, and the work is backed by a written guarantee.
Learn more about our flat roofingWe cover all of D14 and D16. See our full Dundrum roofing service.
For most Irish homes, EPDM rubber is the best all-round flat roofing material. It is a single sheet with very few seams, so it copes well with heavy rainfall and the movement caused by freeze-thaw cycles. GRP fibreglass is an excellent alternative where you need a harder wearing, foot-traffic surface such as a balcony, but it is less forgiving on a timber deck that flexes.
A properly installed EPDM flat roof typically lasts 20 to 30 years, and many go beyond that. It has no felt joints to crack and it handles UV and Irish rain very well over time. That lifespan is a big part of why we recommend it over old-style bitumen felt, which usually needs replacing within 10 to 15 years.
In 2026, EPDM flat roofing in Dundrum runs about €80 to €120 per square metre supplied and fitted, with GRP fibreglass slightly higher. A localised repair to seams or a patch is typically €300 to €1,200. You get a written, fixed price after a free survey, so the figure never changes on completion.
Yes, a flat roof can be converted to a pitched roof, and it is a popular upgrade on older extensions in Dublin. It improves drainage and lifespan but is a bigger structural job than a new flat covering, so the cost is considerably higher. We assess the existing structure and walls during the survey to confirm it is feasible before quoting.
Replacing a flat roof like for like does not need planning permission in Dublin. You may need it if you change the roof's shape or height, or if the property is protected or sits in a conservation area, which affects parts of the Dundrum village core. We flag any of that during the free survey so you know where you stand before work begins.
Nearby areas we cover
Flat Roofing in Dundrum, Dublin South. Free survey, written fixed-price quote, 10-year guarantee.