Home Extensions in Dublin
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Dublin's housing stock is Ireland's most diverse, spanning from Georgian terraces in the city centre (1750s-1830s) through Victorian and Edwardian suburbs (1840s-1910s), inter-war and post-war council housing (1930s-60s), suburban estates (1960s-2000s), Celtic Tiger apartments (1998-2008), and modern high-density developments. Each era presents distinct characteristics for home service providers: Georgian homes have solid brick walls, original timber floors, and sash windows. 1960s-70s suburban semis have cavity block walls, often with minimal insulation, and are the most common candidate for energy retrofits. Celtic Tiger-era apartments may have building defects from the construction boom. The sheer density and variety of Dublin housing means every type of home service has strong, consistent demand.
Dublin has a temperate maritime climate with relatively low rainfall by Irish standards (approximately 750mm annually), though this still exceeds most UK and continental European cities. The east-facing position means less rain than the west coast but more exposure to cold easterly winds in winter, which can affect heating demand and frost risk. Sea proximity moderates temperature extremes. South-facing properties benefit from good solar exposure, making Dublin viable for solar PV installations. Urban heat island effects mean the city centre is typically 1 to 2 degrees warmer than outer suburbs.
Home Extensions in Dublin: Local Insights
Dublin's housing stock is Ireland's most diverse, spanning from Georgian terraces in the city centre (1750s-1830s) through Victorian and Edwardian suburbs (1840s-1910s), inter-war and post-war council housing (1930s-60s), suburban estates (1960s-2000s), Celtic Tiger apartments (1998-2008), and modern high-density developments. Each era presents distinct characteristics for home service providers: Georgian homes have solid brick walls, original timber floors, and sash windows. 1960s-70s suburban semis have cavity block walls, often with minimal insulation, and are the most common candidate for energy retrofits. Celtic Tiger-era apartments may have building defects from the construction boom. The sheer density and variety of Dublin housing means every type of home service has strong, consistent demand.
Dublin has a temperate maritime climate with relatively low rainfall by Irish standards (approximately 750mm annually), though this still exceeds most UK and continental European cities. The east-facing position means less rain than the west coast but more exposure to cold easterly winds in winter, which can affect heating demand and frost risk. Sea proximity moderates temperature extremes. South-facing properties benefit from good solar exposure, making Dublin viable for solar PV installations. Urban heat island effects mean the city centre is typically 1 to 2 degrees warmer than outer suburbs.
Dublin is Ireland's busiest market for all home services due to population density and property values. High demand means competitive pricing for standard trades but premium rates for specialist services. Property values drive significant investment in home improvements, with homeowners willing to spend more on quality materials and finishes. The four Dublin local authorities (City, Dun Laoghaire-Rathdown, Fingal, South Dublin) each have distinct planning approaches. Conservation areas are extensive in Dublin city centre, Dun Laoghaire, and parts of Fingal. Dublin prices for home services are typically 15 to 25% above the national average, reflecting higher labour costs, travel time, and material delivery costs in the urban environment.
Home Extensions Costs in Dublin
Typical costs for home extensions in Dublin (prices may vary (typically 50% above national average)):
| Service | Typical Cost | Notes |
|---|---|---|
| Single-storey rear (20 sq m) | €60,000 | €105,000 | Finish level, ground conditions, access |
| Two-storey side (40 sq m) | €120,000 | €210,000 | Structure, foundations, services |
| Wraparound extension | €90,000 | €180,000 | 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 Dublin
Home Extensions FAQs for Dublin
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.