Single-Storey vs Two-Storey Cost in Ireland — Which Is Cheaper, Which Is More Cost-Efficient
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Single-storey: cheapest per m², largest footprint. Two-storey: most cost-efficient use of the site. Dormer: compromise.
Single-storey bungalow: cheapest per m² (€2,500–€3,200), but largest footprint means more foundation and roof. A 150 m² bungalow on a 150 m² footprint: 150 m² of foundation, 150 m² of roof. A 150 m² two-storey on a 75 m² footprint: 75 m² of foundation, 75 m² of roof. The two-storey is more cost-efficient. Two-storey: most cost-efficient use of the site (€2,700–€3,500/m²). Smaller footprint, more efficient for sloped sites. Dormer bungalow: compromise (€2,700–€3,500/m²). More usable upstairs, smaller roof. Best for accessibility and sloped sites. Most Irish self-builds on standard sites choose two-storey for the cost efficiency; on accessibility-focused sites, the single-storey is the right answer despite the higher m² cost.
When this matters most
You're at design stage and need to choose the form.
When this doesn't apply
You've already chosen a form.
Sources
SCSI, Tender Price Index Q1 2026. https://www.scsi.ie/
Frequently asked questions
Is a bungalow cheaper to build than a two-storey in Ireland?
Cheaper per m² (€2,500–€3,200 vs €2,700–€3,500), but the larger footprint means more foundation and roof. For the same floor area, a two-storey is usually cheaper overall.
What is the most cost-efficient house form?
Two-storey. Smaller footprint, less foundation and roof, same floor area. Most common in suburban Ireland.
Is a single-storey house more accessible?
Yes. All rooms on one level, no stairs. Best for ageing in place and mobility issues. Part M (Access for People with Disabilities) compliance is easier.
When this matters most
You're at design stage and need to choose the form.
When this doesn't apply
You've already chosen a form.
Where to go next
Next decision
The next step in your build sequence.
- Contingency Budget for a Self-Build in Ireland — Why 10% Is the Minimum and 15% Is Safer →
- First Home Scheme in Ireland — Equity Share for New Builds, Eligibility, and the Catch →
- Self-Build Mortgage Step by Step in Ireland — Application to Final Drawdown →
- Stage Payment Triggers in a Self-Build — What Each Drawdown Requires →
- VAT on a Self-Build in Ireland — 13.5% Labour, 23% Materials, and the Sole Trader Route →
Branch into
Adjacent decisions at the same stage.
- Help-to-Build in Ireland 2026 — €30,000 Toward the Deposit, Income Caps, and How to Apply →
- Mortgage Interest During Build in Ireland — How It Works, What It Costs, and the Trap →
- Quantity Surveyor for a Self-Build in Ireland — When to Hire One and What It Saves →
- Self-Build Cashflow in Ireland — How the Money Flows Month by Month →
Watch out for
Common mistakes, hidden costs, gotchas.
- Grants for Self-Build in Ireland 2026 — SEAI, Help-to-Build, and the Eligibility Trap →
- Hidden Costs of a Self-Build in Ireland — The 12 That Catch First-Timers →
- Mortgage Interest During Build in Ireland — How It Works, What It Costs, and the Trap →
- Self-Build Cost per m² in Ireland 2026 — Total Project Cost and the Line Items →