Converting your attic is one of the smartest ways to increase your home’s usable space without altering its footprint. Whether you’re planning a new bedroom, home office or an en-suite guest suite, understanding the attic conversion cost in Dublin is essential before you begin. This comprehensive guide breaks down everything you need to know about attic conversion pricing, factors that affect costs, planning rules, and how to maximise value in 2025.
Why Convert Your Attic in Dublin?
With property prices in Dublin remaining high and planning permission for extensions increasingly complex, attic conversions offer homeowners a high-return alternative to moving or expanding outward. An attic conversion can:
- Add a functional bedroom or office
- Improve home energy efficiency
- Increase overall property value
- Avoid the cost and hassle of relocation
The key, however, is understanding how much an attic conversion costs in Dublin today.
Average Attic Conversion Cost in Dublin
The cost of an attic conversion in Dublin varies based on size, design, structural work, and desired finishes. As of 2025, here’s what homeowners can expect:
Type of Attic Conversion | Estimated Cost (Dublin) |
Velux-only basic conversion | €20,000 – €28,000 |
Standard conversion with dormer | €30,000 – €45,000 |
Hip-to-gable plus rear dormer | €40,000 – €55,000 |
High-end conversion with ensuite | €50,000 – €70,000+ |
Note: These are general estimates for Dublin homes and may vary depending on specific design requirements and contractor rates.
Key Factors Affecting Attic Conversion Cost in Dublin
1. Size and Usable Floor Area
Larger attic spaces naturally cost more to convert due to increased material and labour demands. In Dublin, the average cost per square metre ranges between €1,000 and €1,600/m².
- Small attic (15–25 m²): €15,000–€25,000
- Medium attic (25–35 m²): €25,000–€35,000
- Large attic (35–50 m²+): €35,000–€50,000+
2. Type of Conversion
Different structural designs come with different price tags:
- Velux conversions: Cheapest option, no dormer required
- Dormer conversions: Add headroom and natural light, ideal for bedrooms
- Hip-to-gable: Converts sloped roofs to vertical walls, increases usable space
- L-shaped dormers: Often used on period or terraced houses for maximum space
3. Structural Modifications
Older homes in Dublin may need floor reinforcement, new joists, or beam installation, especially for habitable space.
- Structural works: €5,000 – €15,000+
4. Staircase Installation
Building regulations require fixed, code-compliant stair access for habitable rooms.
- Custom-built staircases in Dublin: €3,000 – €8,000
5. Windows and Natural Light
Velux roof lights are more affordable than dormer windows but offer less headroom.
- Velux installation: €1,500 – €3,000
- Dormer windows: €5,000 – €15,000+
6. Plumbing and Bathrooms
If you’re adding an en-suite, plumbing can significantly increase your conversion cost.
- Ensuite with fixtures: €7,000 – €15,000+
7. Electrical & Heating Work
All attic conversions in Dublin require safe wiring, fire alarms, and heat extension:
- Electrical: €2,000 – €5,000
- Heating (radiator or HVAC extension): €2,000 – €4,500
Planning Permission & Building Regulations in Dublin
Do You Need Planning Permission?
Not all attic conversions require planning permission in Dublin. If you’re installing Velux windows without altering the roofline, you may be exempt. However, if you’re adding a dormer or increasing roof height, permission is likely required.
Always consult with a local architect or engineer before beginning your attic conversion in Dublin. For more information about the attic planning permission, click here
Building Regulations
To be classified as a habitable room, your attic must meet:
- Minimum ceiling height of 2.4m over 50% of the floor
- Permanent stairs (not retractable ladders)
- Proper insulation and ventilation
- Emergency egress window for fire safety
- Fire-rated materials and doors
How to Save Money on Your Dublin Attic Conversion
- Choose a straightforward layout: Dormer windows are pricier than Velux.
- Re-use existing plumbing lines: Position bathrooms above one another to cut costs.
- Compare quotes: Get at least 3 detailed estimates from trusted Dublin attic conversion specialists.
- Avoid custom finishes: Standard fixtures and fittings can save thousands.
- Check if grants apply: Some insulation or energy-efficiency grants may apply if included in your works.
Is an Attic Conversion Worth the Investment?
While the upfront cost can be significant, the return on investment is often worthwhile:
- Adds functional living space
- Enhances resale appeal
- May increase property value by €20,000 – €60,000 depending on area and quality
If your home is in a competitive Dublin suburb or near transport links, the benefits are even greater.
Final Thoughts on Attic Conversion Cost in Dublin
Investing in an attic conversion can transform your Dublin home, especially if you’re looking to avoid the rising costs of moving or building an extension. Understanding the average attic conversion cost Dublin homeowners face ensures you plan properly, budget effectively and get the most from your investment.
If you’re ready to explore your options, OS Holding can help. As one of Dublin’s top-rated building contractors, we specialise in high-quality attic conversions, renovations, and full design-build solutions. Our experienced team will guide you from concept to completion, ensuring a smooth, transparent, and stress-free process.
Contact us today for a no-obligation quote and expert advice on making the most of your attic space.
