Attic Conversions Quotes in Ireland
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An attic conversion is one of the most cost-effective ways to add a bedroom, home office, or playroom to your home without the disruption and expense of a full extension. You are building within the existing roof structure, which means no foundations, no ground works, and significantly less mess than a traditional build. For many Irish families outgrowing their three-bed semi, converting the attic is the obvious solution.
The feasibility depends on your roof. Most Irish homes built from the 1960s onward have trussed roof structures that can be converted, though the trusses will need to be modified or replaced to create usable space. Older homes with traditional cut roofs (rafters and purlins) are often easier and cheaper to convert. The minimum usable head height is 2.2 metres at the highest point, and your attic needs enough width to create a practical room once the sloped ceilings are factored in.
There are two main types: a Velux or rooflight conversion (where the existing roof pitch is kept and rooflights are installed for light and ventilation) and a dormer conversion (where a box-shaped dormer extends out from the roof slope, creating much more usable floor area with full-height walls). Velux conversions are cheaper (€15,000 to €25,000) and usually do not require planning permission. Dormers cost more (€25,000 to €45,000) and may need planning depending on size and position.
Fire safety is the critical regulatory issue in attic conversions. Building regulations require a protected escape route from the new attic room to the front door, which usually means upgrading the hall, landing, and staircase with fire doors, fire-rated plasterboard, and interconnected smoke alarms. A staircase to the attic must also be built, which consumes space on the floor below. Getting quotes from experienced attic conversion specialists (not general builders who do the occasional attic) ensures these requirements are handled properly.
How Much Does Attic Conversions Cost in Ireland?
Typical pricing for attic conversions services in Ireland (2026):
| Service | Typical Cost | Notes |
|---|---|---|
| Basic attic conversion (Velux) | €15,000 | €25,000 | Size, roof structure, access |
| Dormer attic conversion | €25,000 | €45,000 | Dormer size, finish level |
| Attic conversion with en-suite | €30,000 | €50,000 | Plumbing complexity, size |
Attic conversion costs depend primarily on the type of conversion (Velux vs dormer), whether structural modifications to the roof trusses are needed, and whether you are adding an en-suite bathroom. A dormer adds significantly more usable space but costs €10,000 to €20,000 more than a Velux conversion. An en-suite adds €5,000 to €10,000 depending on specification. Staircase installation costs €3,000 to €6,000 depending on design and the layout of the floor below. Dublin labour rates push total costs 15-20% above the national average.
What to Expect: The Attic Conversions Process
- Feasibility assessment. A specialist inspects your attic, measures head height and floor area, checks the roof structure (trussed or cut), and assesses whether a Velux or dormer approach is best suited.
- Design and drawings. An architect or the conversion specialist produces drawings showing the layout, staircase position, dormer design (if applicable), fire safety measures, and structural details.
- Planning permission (if needed). Dormer conversions visible from the front of the house or those exceeding size limits require planning. Rear dormers on many houses are exempt. Your designer confirms this.
- Building control notification. A Commencement Notice is submitted to BCMS before work begins.
- Construction. The roof is modified (trusses cut and supported with steel beams), the floor is strengthened, insulation is installed, the dormer is built (if applicable), rooflights are fitted, the staircase is constructed, and first fix (electrics, plumbing for en-suite) is completed. Then plastering, second fix, and decoration finish the job.
- Fire safety compliance. Fire doors are installed on the new room, landing, and all rooms off the escape route. Fire-rated plasterboard is fitted where required. Interconnected smoke and heat alarms are installed throughout.
Common Mistakes to Avoid
- Using a general builder instead of an attic conversion specialist. Attic work is intricate and space-constrained. A company that does conversions every week will be faster, neater, and more compliant than a builder learning on the job.
- Ignoring fire safety requirements. Skipping fire doors and fire-rated plaster saves a few hundred euro but creates a serious safety risk and a legal compliance issue when you sell. Buyers' surveyors and solicitors check this.
- Not planning the staircase position carefully. The staircase takes space from the floor below. Positioning it poorly can make a bedroom below too small or create an awkward hallway. Plan the staircase first, not last.
- Underestimating the impact on the floor below. The conversion affects not just the attic but the entire stairwell. Fire doors throughout the house, a new staircase, and possible loss of a cupboard or part of a room on the first floor are all part of the project.
- Skipping building control notification. The conversion must be notified to the Building Control Authority. Failure to do this means no compliance certificate, which causes problems when selling.
What to Look for When Hiring an Attic Conversions Professional
Choose a specialist attic conversion company rather than a general builder. Attic conversions involve structural engineering, roofing, carpentry, plumbing, electrical, plastering, and fire safety compliance all within a confined space, and companies that do this every day will be faster, neater, and more compliant than a general builder learning on the job. Check for CIRI registration and CIF membership. Ensure the company carries public liability and employer's liability insurance and provides a written structural guarantee. Ask specifically about their approach to fire safety compliance, as this is the area most commonly done incorrectly and the one that causes problems when you sell.
Questions to Ask Your Attic Conversions Professional
- Is my attic suitable for conversion? Not all attics can be converted. Head height, roof structure, and access for a staircase all determine feasibility. A good specialist will tell you honestly if your attic is not viable.
- Will I need planning permission? Rear dormers are often exempt, but front dormers, oversized dormers, and conversions on protected structures require planning. The answer depends on your specific house and local authority.
- How will you handle fire safety compliance? Building regulations require a protected escape route to the front door. This means fire doors, fire-rated plaster, and interconnected alarms. If these are not done correctly, you face problems when selling.
- Where will the staircase go? The staircase consumes space on the floor below (typically from a bedroom or landing). The position affects both the usability of the new room and the layout of the existing floor.
- Can you include an en-suite bathroom? An en-suite adds significant value and functionality to an attic bedroom. Not all attics have the space or plumbing access for one. Discuss this early in the design process.
- What insulation will be installed? Attic rooms are directly under the roof, making them the hottest room in summer and coldest in winter without excellent insulation. Ask about insulation type, thickness, and the expected thermal performance.
Frequently Asked Questions
A Velux rooflight conversion costs €15,000 to €25,000. A dormer conversion costs €25,000 to €45,000. Adding an en-suite bathroom adds €5,000 to €10,000. These prices include structural work, insulation, staircase, electrics, plastering, and decoration. They typically exclude floor coverings, furniture, and any upgrades to the floor below (fire doors, fire-rated plaster) unless specified. Dublin prices run 15-20% above the national average.
A Velux conversion with no change to the external appearance of the roof generally does not need planning permission. A dormer to the rear of the house is often exempt, provided it meets size and height limits. A dormer visible from the front of the house or on a road-facing roof typically requires planning. If your home is a protected structure or in an Architectural Conservation Area, planning is almost always required. Your designer should confirm exemption status with your local authority before work begins.
Building regulations require a protected escape route from the new attic room to the front door. This means: fire doors (FD30) on the attic room, all rooms off the staircase, and the front entrance; fire-rated plasterboard (30-minute rating) on walls and ceilings along the escape route; interconnected smoke alarms on every level with a heat alarm in the kitchen; and a window in the attic room large enough for emergency escape. These requirements exist because a fire on the ground floor can trap occupants in the attic.
A Velux conversion typically takes 3 to 4 weeks. A dormer conversion takes 4 to 6 weeks. Adding an en-suite adds another week. These timelines assume an experienced specialist team. General builders unfamiliar with attic work may take significantly longer. You can live in the house during the work, though there will be noise and dust, particularly during the roofing phase.
The key requirements are: minimum head height of 2.2 metres at the ridge (higher is better), enough width between the eaves to create a practical room (ideally 5 metres or more wall to wall), adequate access for a staircase from the floor below, and a roof structure that can be modified. Most homes built since the 1960s can be converted. Very small terraced houses, houses with low-pitched roofs, or properties with attic-level water tanks may have challenges that increase cost or reduce the usable space.
Yes. A well-finished attic bedroom with en-suite typically adds €20,000 to €40,000 to a property's value, depending on the area and the quality of the work. In Dublin, where space is at a premium, the value added often exceeds the conversion cost. The key is that the work must be done to building regulation standards with proper documentation, as buyers' solicitors will check for compliance certificates.
Converting the attic means losing your primary storage area. Many conversion designs incorporate eave storage (the low areas at the sides where you cannot stand) as built-in cupboards or shelving. This is an easy and inexpensive addition that most homeowners appreciate. If the attic currently contains your water tank, this will need to be relocated or replaced with a mains-pressure system.
This is strongly inadvisable. Attic conversions involve structural modifications to your roof (cutting trusses, installing steel beams), compliance with building regulations, fire safety requirements, and electrical and plumbing work that must be certified. A DIY approach risks structural failure, fire safety non-compliance, and building control issues that make the property unsaleable. The cost savings of DIY are far outweighed by the risks.
Attic Conversions Quotes by County
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