Home Extensions in Galway
Compare up to 4 home extensions professionals in Galway. Free, no obligation.
Galway city has a vibrant mix of period townhouses in the medieval core, Georgian residences along Eyre Square and Taylor's Hill, and modern estates in Knocknacarra, Salthill, and Renmore. The city has significant apartment stock near NUIG and the hospital. Rural Galway features traditional stone cottages in Connemara (many with thick stone walls requiring specialist insulation approaches), one-off rural houses throughout east Galway, and holiday homes along the coast that need maintenance for short-season use. The Tuam and Ballinasloe areas have older market-town housing from the 1960s-70s alongside newer estates.
Galway is one of Ireland's wettest counties, with western Connemara areas receiving over 1,500mm of rainfall annually. Atlantic storms bring high winds that test roofing, external render, and boundary fencing severely. Coastal properties face extreme salt air exposure that accelerates corrosion of metalwork, paintwork, and roofing fixings. The Atlantic influence means milder winters than inland but persistent dampness. Galway city itself is relatively sheltered by comparison but still significantly wetter than eastern counties. These conditions make weatherproofing, ventilation, and damp management particularly important for all home services.
Home Extensions in Galway: Local Insights
Galway city has a vibrant mix of period townhouses in the medieval core, Georgian residences along Eyre Square and Taylor's Hill, and modern estates in Knocknacarra, Salthill, and Renmore. The city has significant apartment stock near NUIG and the hospital. Rural Galway features traditional stone cottages in Connemara (many with thick stone walls requiring specialist insulation approaches), one-off rural houses throughout east Galway, and holiday homes along the coast that need maintenance for short-season use. The Tuam and Ballinasloe areas have older market-town housing from the 1960s-70s alongside newer estates.
Galway is one of Ireland's wettest counties, with western Connemara areas receiving over 1,500mm of rainfall annually. Atlantic storms bring high winds that test roofing, external render, and boundary fencing severely. Coastal properties face extreme salt air exposure that accelerates corrosion of metalwork, paintwork, and roofing fixings. The Atlantic influence means milder winters than inland but persistent dampness. Galway city itself is relatively sheltered by comparison but still significantly wetter than eastern counties. These conditions make weatherproofing, ventilation, and damp management particularly important for all home services.
Strong tourism and university sectors drive demand for property services, with holiday home conversions and rental property upgrades forming a significant market segment. Galway city has strict planning controls in the medieval core and along the waterfront. Rural Galway requires landscape impact assessments for new builds, and Gaeltacht areas in Connemara have specific requirements including Irish language signage. The creative and tech sectors (Medtronic, SAP, EA Games) have increased demand for premium home improvements in the city suburbs. Competition among contractors is moderate, with fewer providers than Cork or Dublin.
Home Extensions Costs in Galway
Typical costs for home extensions in Galway (prices may vary (typically 20% above national average)):
| Service | Typical Cost | Notes |
|---|---|---|
| Single-storey rear (20 sq m) | €48,000 | €84,000 | Finish level, ground conditions, access |
| Two-storey side (40 sq m) | €96,000 | €168,000 | Structure, foundations, services |
| Wraparound extension | €72,000 | €144,000 | Size, design complexity |
Extension costs vary most based on five factors: the size and shape of the extension, the structural complexity (steel beams for open-plan layouts cost €2,000 to €5,000 per beam), your specification level (standard vs premium finishes), whether you need a new kitchen or bathroom in the extension, and your location. Dublin builders charge 15-25% more than the national average. Rural areas may be slightly cheaper for labour but can carry material delivery surcharges. Always add a 10-15% contingency to your budget because extensions in older homes almost always uncover unexpected issues once walls and floors are opened up.
Areas We Cover in Galway
Home Extensions FAQs for Galway
A standard single-storey rear extension costs €2,000 to €3,500 per square metre in Ireland. A 20 sq m kitchen extension therefore costs €40,000 to €70,000. A 40 sq m open-plan extension runs €80,000 to €140,000. Two-storey extensions cost €1,800 to €3,000 per square metre because foundation and roof costs are shared. These figures include the build but not architect's fees (8-12% of build cost), planning permission (€65 application fee), or kitchen/bathroom fit-out. Dublin prices are 15-25% above the national average.
Many single-storey rear extensions up to 40 sq m are exempt from planning permission under exempted development rules. However, exemptions come with strict conditions: the extension cannot exceed certain height limits, must not reduce the rear garden below 25 sq m, and the total floor area of all extensions cannot exceed the original house's floor area by more than a set amount. Two-storey extensions generally require planning permission. If your home is a protected structure or in an Architectural Conservation Area, different rules apply. Always verify with your architect or local authority before assuming exemption.
A straightforward single-storey rear extension typically takes 10 to 16 weeks from breaking ground to handover. A two-storey extension takes 14 to 22 weeks. If planning permission is required, add 8 to 12 weeks for the application process. Design and tendering take another 4 to 8 weeks before work starts. In total, expect 6 to 9 months from first meeting your architect to moving into the finished extension. Weather delays (particularly in winter), material supply issues, and subcontractor scheduling can all extend the timeline.
Legally, you do not need an architect for small exempt extensions, but it is strongly advisable for anything beyond a very basic box. An architect ensures your extension is well-designed (maximising light, space, and flow), compliant with building regulations, and properly documented for building control. They also manage the tender process, inspect the work during construction, and handle snagging. Architect's fees are typically 8 to 12% of the build cost, and for most homeowners the investment pays for itself in a better result and fewer problems.
Open-plan kitchen-living-dining extensions add the most value because they create the type of living space that Irish buyers now expect. Large glazed openings onto the garden (sliding or bi-fold doors) are highly desirable. Underfloor heating in the new space is a relatively low-cost add that buyers value. A well-designed utility room and good storage are also consistently cited by estate agents as value-adding features. Poorly designed extensions that create awkward layouts or block light from existing rooms can actually reduce value.
Under Irish building regulations, you must submit a Commencement Notice to the Building Control Authority via the BCMS online system at least 14 days before work starts. For extensions over 40 sq m, this is a Statutory Commencement Notice, which requires an assigned certifier (architect or engineer) and supporting documentation. For smaller extensions, an optional Commencement Notice may be used. Your architect or engineer handles this paperwork. Non-compliance with building control can create serious problems when you come to sell.