House Extension Cost Ireland 2026

House Extension Cost Ireland 2026: Single-storey rear extension €2,200-€3,200/sqm. Two-storey extension €1,800-€2,800/sqm. Side return €2,500-€3,500/sqm. Sunroom €1,500-€2,500/sqm. A typical 20 sqm kitchen extension costs €44,000-€64,000. Extensions up to 40 sqm to the rear generally exempt from planning permission. Cost breakdown: groundworks 8-12%, structural 15-20%, roof 10-15%, windows 8-12%, first fix 10-15%, second fix 10-15%, finishing 8-12%, professional fees 5-10%.

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