Dormer attic conversions are one of the most valuable home upgrades in Ireland, but they also require careful budgeting. This guide breaks down attic conversion costs in Ireland for 2026, including dormer vs Velux conversions, regional pricing, and factors that influence the final price.
Table of Contents
- Quick answer: average costs
- Dormer vs Velux conversion costs
- Cost by attic size
- Regional pricing
- What affects the price
- Planning permission and grants
- FAQs
Quick Answer: Average Costs
Most Irish homeowners pay €25,000 to €60,000 for a dormer conversion, depending on size and complexity. Velux conversions are typically cheaper.
Estimate your project using the Attic Conversion Calculator.
Dormer vs Velux Conversion Costs
| Type | Typical Cost Range | Best For |
|---|---|---|
| Velux (rooflight) conversion | €15,000-€30,000 | Light, low impact, no dormer structure |
| Dormer conversion | €25,000-€60,000 | Extra space, full room height |
| Hip-to-gable + dormer | €45,000-€80,000 | Maximize space in semi-detached homes |
Cost by Attic Size
| Attic Size | Typical Cost Range |
|---|---|
| Small (20-25 m2) | €20,000-€35,000 |
| Medium (25-35 m2) | €28,000-€48,000 |
| Large (35-45 m2) | €38,000-€65,000 |
| Very large (45+ m2) | €50,000-€85,000 |
Regional Pricing
| Region | Typical Range |
|---|---|
| Dublin | €30,000-€70,000 |
| Cork | €28,000-€65,000 |
| Galway | €27,000-€62,000 |
| Rest of Ireland | €25,000-€60,000 |
What Affects the Price
- Roof structure: older roofs may need strengthening
- Staircase placement: complex layouts add cost
- Plumbing and electrics: bathrooms and heating upgrades increase budget
- Insulation upgrades: required for compliance
- External finishes: matching tiles/slates adds labour
Planning Permission and Grants
Most dormer conversions need planning permission. Velux conversions often fall under permitted development, but check local authority rules.
For energy upgrades, consult the SEAI Grant Checker.
Related Services and Tools
External reference: SEAI Home Energy Grants
FAQs
How much does a dormer attic conversion cost in Ireland?
Typical cost ranges from €25,000 to €60,000, depending on size and complexity.
Is a dormer worth the extra cost?
Dormers add significant floor space and headroom, often making them better value than smaller Velux-only conversions.
Do I need planning permission for a dormer?
Yes in most cases. Velux-only conversions sometimes fall under exempted development, but check with your local authority.
How long does a dormer conversion take?
Most projects take 6-12 weeks, depending on structural complexity and weather.
Can I convert any attic?
Not always. A roof inspection and structural assessment will confirm feasibility.
Get a Dormer Conversion Quote
Call +353 89 981 9675 or request your free quote.
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