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Flat Roof Replacement guides, calculator & reference

Every flat roof replacement cost guide, specification comparison, interactive calculator, FAQ and technical glossary on flatroofreplacement.ie in one place.

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Core flat roof replacement guides

Detailed guides covering prices, specifications and what to check before you book.

Drawing of a warm flat roof on an extensionFlat roof replacementExtensions, garages and dormers. €3,000 to €6,500 on a kitchen extension.More on flat roof replacement →Drawing of a roof edge with a gutter and downpipeFlat roof repairLeaks, blisters, split seams, outlets. €250 to €900.More on flat roof repair →Drawing of an EPDM rubber roof turned up the house wallEPDM rubber roofsOne sheet, no flame. €70 to €140 a m² laid.More on epdm rubber roofs →Drawing of a GRP roof in layers: deck, resin and glass mat, topcoatGRP fibreglass roofsHard and walkable. €75 to €140 a m² laid.More on grp fibreglass roofs →Drawing of three layers of torch-on felt being laidTorch-on felt roofsThe lowest cost. €55 to €90 a m² laid.More on torch-on felt roofs →Drawing of a warm flat roof in section: membrane, insulation, vapour layer, deckWarm flat roofsInsulation above the deck. €130 to €190 a m².More on warm flat roofs →

Calculators, FAQ and glossary

ResourceWhat's insideHow it helps
Interactive Cost CalculatorLive price rangeSelect your specification options to get an instant Irish guide price.
Master FAQ Hub14 questions answeredStraight answers on pricing, preparation, timelines, rules and aftercare.
Technical & Trade Glossary15 terms definedPlain-English definitions of every flat roof replacement specification and standard.
All 26 Counties Index26 county pagesLocal housing data and one flat roofing company that covers your county.

Flat roofs in every county

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Questions people ask

How much does flat roof replacement cost in Ireland?

A kitchen extension of 25 to 40 m² costs €3,000 to €6,500, a single garage €1,800 to €5,200 and a porch or dormer €1,800 to €2,800. The cost guide breaks it down by size, material and county.

Which is better, EPDM, GRP or felt?

EPDM is one sheet with no seams on most house roofs and needs no flame. GRP is hard and can be walked on. Felt costs least and lasts least. See EPDM vs GRP vs felt.

How long does it take?

One to three days on most house flat roofs, weather allowing. See how long it takes.

Can you just fix the leak?

Often, yes. One fault on a sound roof is a repair: €250 to €900. If the deck is soft or the roof leaks in several places, it's a replacement, and the company will say so.

Every guide, calculator and county page

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Price & Specification Guides

Calculator, FAQ & Glossary

All 26 Counties

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Related 2026 Ireland Specialist Cost & Technical Guides

Cross-referenced Irish pricing benchmarks, SEAI/Revenue grant rules, and county specifications from partner reference hubs: