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Find, compare, and request free quotes from verified home extension builders serving Blackrock and South Dublin. Background-checked, insured, and rated by local homeowners.
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Planning a house extension in Blackrock is one of the most effective ways to create open-plan living, expand your kitchen, or add master bedroom suites without the expense of relocating. With property values in South Dublin among the highest in Ireland, a well-executed home extension adds substantial long-term value.
Constructors.ie is Ireland's vetted construction directory. We connect property owners in Blackrock with verified, fully insured building contractors who specialize in architect-led extensions, side-returns, and open-plan kitchen renovations.
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Extensions in Blackrock range from single-storey rear glass-box extensions on Victorian terraced villas on Mount Merrion Avenue and Carysfort, Edwardian red-bricks, and 1930s–1960s semi-detached family homes across Newtownpark Avenue and Stradbrook. Common projects include:
Under Irish planning regulations, you can construct a ground-floor extension to the rear of your home in Blackrock without planning permission, provided:
DLR Architectural Conservation Areas (ACA): Parts of Blackrock fall within designated Architectural Conservation Areas (Blackrock Village ACA, Mount Merrion Avenue ACA, Carysfort Avenue Architectural Conservation Area). While standard rear and side elevations are frequently exempt, modifying front-facing Victorian brickwork, decorative granite quoins, or street-facing façades may require planning permission or a Section 5 Declaration of Exemption from Dún Laoghaire-Rathdown County Council (DLR). Always verify boundary clearances and front elevations with your contractor prior to ordering materials.
Construction costs in South Dublin reflect high material quality and structural standards. Below are typical square-metre rates from vetted contractors serving Blackrock:
| Extension Type | Cost per Sq. Metre | Typical 30m² Build | Typical 40m² Build |
|---|---|---|---|
| Standard Single-Storey Rear | €2,400 – €2,900 / m² | €72,000 – €87,000 | €96,000 – €116,000 |
| Architectural High-Spec (Large Glazing/Alu-Clad) | €2,900 – €3,600 / m² | €87,000 – €108,000 | €116,000 – €144,000 |
| Two-Storey Extension | €2,600 – €3,200 / m² | €130,000 (50m²) | €180,000+ (60m²+) |
In Blackrock, house extensions typically cost between €2,400 and €3,200 per square metre for standard builds, and up to €3,600+ per sq. m. for bespoke architectural designs featuring floor-to-ceiling glazing. A standard 30 sq. m. rear extension costs approximately €72,000 to €95,000 excluding bespoke kitchen cabinetry.
Yes, ground-floor extensions up to 40 square metres (430 sq. ft.) to the rear of your home in Blackrock are generally exempt from planning permission under DLR regulations, provided you retain at least 25 sq. m. of rear garden and comply with height and boundary limits.
A standard 30–40 sq. m. single-storey extension takes between 10 and 16 weeks from ground excavation to turnkey handover. More complex two-storey extensions or full ground-floor structural reconfigurations take 16 to 24 weeks.
For planning-exempt extensions under 40 sq. m., many homeowners work directly with experienced design-and-build contractors who provide in-house structural engineering and architectural drawings. For complex sites, protected structures, or planning applications in Blackrock, engaging a RIAI-registered architect alongside a vetted builder is recommended.