Attic Conversion Cost Dublin 2026 | What You Will Actually Pay

Introduction

Dublin is the most expensive city in Ireland for an attic conversion. Labour rates are the highest in the country. Access in older city streets adds cost. Conservation rules in many inner-city areas restrict what you can build. And the vast majority of Dublin homes built after 1980 have truss roofs that need structural steel work before a single room can be created.

But it is also one of the best investments an Irish homeowner can make right now. Space is scarce in Dublin. An extra bedroom, a home office or even a decent playroom adds real value and real quality of life — without losing the garden or moving house.

Attic conversion cost Dublin in 2026 runs from EUR20,000 for a basic rooflight conversion on a small terraced house up to EUR70,000+ for a full dormer with en-suite on a larger home. This guide gives you honest, specific numbers for every house type, every conversion type and the Dublin-specific factors that push the price up.

Attic Conversion Cost Dublin — Quick Answer

Most Dublin homeowners pay between EUR25,000 and EUR55,000 for a completed attic conversion in 2026.

A basic Velux-only conversion on a Dublin semi-D starts around EUR20,000-EUR30,000. A rear dormer with no en-suite runs EUR32,000-EUR48,000. Add an en-suite and budget EUR42,000-EUR60,000 for a dormer with bathroom.

Standard rooflight conversions in a Dublin semi-detached house run from EUR20,000 to EUR30,000, while a dormer conversion with en-suite sits in the EUR40,000 to EUR55,000 range.

These are Dublin-specific figures. Dublin market rates run 10-15% higher than the national average due to labour costs and access constraints.

House type	Velux only	Rear dormer (no en-suite)	Rear dormer + en-suite
Terraced (pre-1980)	EUR20,000-EUR28,000	EUR30,000-EUR42,000	EUR40,000-EUR55,000
Semi-detached	EUR22,000-EUR32,000	EUR32,000-EUR48,000	EUR42,000-EUR62,000
Detached 3-bed	EUR28,000-EUR40,000	EUR40,000-EUR58,000	EUR50,000-EUR72,000
Bungalow	EUR26,000-EUR38,000	EUR38,000-EUR55,000	EUR48,000-EUR68,000

All figures include materials, labour, structural work, insulation, electrics, plasterboard, staircase and VAT at 13.5%. Decoration is not included.

Use the free attic conversion cost calculator to get a price range for your Dublin house type in 60 seconds.

Why Does an Attic Conversion Cost More in Dublin?

Dublin adds cost in three ways that most online guides skip over.

Higher labour rates.
Dublin conversion specialists charge EUR350-EUR450 per tradesperson per day. A crew of three working for eight days costs EUR8,400-EUR10,800 in labour alone. The same crew in Galway costs EUR6,600-EUR8,400. That gap runs through every element of the job.

Access and logistics.
Older Dublin estates and city-centre terraces are tighter to work in. A skip truck that parks easily on a rural road needs a permit and a specific time window in Ranelagh. Scaffolding in a narrow D8 terrace can cost EUR800-EUR1,200 more than the same rig in a wider suburban street. Dormer construction on a city-centre terrace with restricted rear access takes longer.

Steel prices and structural complexity.
Steel prices have fluctuated in Dublin over the last few years, which does affect overall budgets. Dublin homes built between 1970 and 2000 — the bulk of the semi-D stock in Clondalkin, Finglas, Blanchardstown and Tallaght — almost all have truss roofs. Removing truss webbing and installing RSJ steel beams adds EUR6,000-EUR14,000 to any conversion.

Cost by House Type — Dublin

Terraced house
Pre-1980 Dublin terraces in areas like Rialto, Inchicore, Ballybough and Cabra often have cut roofs with generous head height. These are the cheapest to convert because no truss removal is needed. A standard Velux conversion on a narrow Dublin terrace costs EUR20,000-EUR28,000. A rear dormer on the same house costs EUR30,000-EUR42,000.

Post-1980 terraced houses in estate developments almost always have truss roofs. Add EUR6,000-EUR12,000 for steel work to any figure above.

Semi-detached house
The 3-bed semi-D across Dublin's suburbs is the most common conversion project in the city. Families in places like Lucan, Clontarf, Raheny, Castleknock and Dundrum are running out of space — but they do not necessarily want to move.

A Velux-only conversion on a Dublin semi-D costs EUR22,000-EUR32,000. A rear dormer with no bathroom costs EUR32,000-EUR48,000. A full dormer with en-suite — the most popular spec — costs EUR42,000-EUR62,000. Dublin prices run 12-15% above the national average for the same job.

Detached house
Larger detached homes in areas like Castleknock, Clontarf, Foxrock and Terenure have bigger attic footprints and more options. Hip-to-gable conversions are more common on detached properties. A full hip-to-gable with rear dormer and en-suite on a large Dublin detached home can reach EUR65,000-EUR80,000.

Victorian and Edwardian terraces (Rathmines, Ranelagh, Drumcondra)
A steep-pitch roof — common in Victorian terraces in Rathmines, Ranelagh, and Drumcondra — typically gives you more headroom to work with and can reduce the cost of structural intervention. These homes often have cut roofs with good natural height, which means no truss work. But conservation area rules (see below) may restrict what you can add to the external roof.

Cost by Conversion Type — Dublin Rates

Conversion type	Dublin cost range	Notes
Velux (rooflight only)	EUR20,000-EUR32,000	Cheapest; needs existing head height
Rear box dormer	EUR32,000-EUR50,000	Most popular in Dublin semi-Ds
L-shaped dormer	EUR42,000-EUR60,000	Side + rear combined; more space
Full-width rear dormer	EUR45,000-EUR65,000	Maximum space; may need planning
Hip-to-gable	EUR40,000-EUR58,000	Detached homes; always needs planning
Hip-to-gable + dormer	EUR55,000-EUR75,000+	Maximum option; full planning required

Rear dormers are more affordable than front or L-shaped dormers. A full-width dormer will cost significantly more but offers the most space.

Add EUR8,000-EUR15,000 for an en-suite to any figure above. Dublin plumbing rates are higher than national average.

Does Your Dublin Postcode Affect the Price?

Yes. Three factors vary by postcode: labour availability, access difficulty and planning complexity.

City centre (D1, D2, D7, D8):
The most expensive postcodes for attic conversions. Narrow streets, skip restrictions, parking issues and conservation area rules all add cost. In the parts of Dublin which have terraced streets and where the housing density is high, many homes lack sufficient garden space to extend at ground level. That same density that makes conversions attractive also makes them more expensive to do. Expect 10-15% above the standard Dublin rate.

Inner suburbs (D4, D6, D9, D14, D6W):
Standard Dublin pricing. Better access than the city centre but still 12-15% above the national average.

Outer suburbs (D12, D15, D16, D22, D24):
At or slightly below standard Dublin rates. Wider streets, easier access and more competition between contractors.

County Dublin (Fingal, South Dublin, Dun Laoghaire):
Broadly at Dublin rates, with outer Fingal areas (Swords, Blanchardstown outskirts) being slightly more competitive.

The Dublin Conservation Area Problem

This is the issue most Dublin guides completely ignore.

Dublin City Council designates certain areas as Architectural Conservation Areas (ACAs). In these areas, changes to the external appearance of buildings — including adding dormers, changing roof profiles or altering existing features — may require planning permission even where they would normally be exempt.

ACAs in Dublin include large portions of Rathmines, Ranelagh, Ringsend, Phibsborough, Drumcondra, Clontarf and many inner-city streetscapes.

If your home is in an ACA:

• A rear dormer may still be exempt if it meets the standard size conditions
• Any dormer visible from the street will almost certainly need planning permission
• Changing external materials may require permission even at the rear
• Large full-width rear dormers are now often refused by Dublin City Council — they were common 10-15 years ago but councils now restrict them in many areas

How to check: Go to dublincity.ie, search for your address and check the Development Plan map layer. If you are in an ACA, call the DCC planning duty officer before starting any design work. A five-minute call can save months of delay.

Most Dublin Conversions Are Non-Habitable — What This Means

This is the thing most Dublin attic conversion guides explain badly. It matters enormously if you ever plan to sell.

Most attic conversions are carried out as "non-habitable storage rooms." In reality, they are used as bedrooms, offices, studies, games or computer rooms, and emergency guest bedrooms.

Why non-habitable? To be legally a habitable room, the space must have at least 2.4m of ceiling height over 50% of the floor area. Most Dublin semi-Ds do not meet this without a dormer. The average semi-D attic has a ridge height of around 2.2m-2.5m at the apex. It drops quickly below the required height over a smaller portion of the floor.

What this means when you sell:
If you sell the house, you state that the attic has been converted. Buyers will see the value of the extra space. It does not matter to most buyers that you cannot officially call it a bedroom.

But — and this is important — the conversion must still have a commencement notice and engineer cert to have any legal standing at all. Without paperwork, the conversion adds no recognised value and buyers' solicitors will flag it as an issue.

A properly certified non-habitable conversion adds value and causes no problems at sale. An uncertified conversion of any kind is a problem.

Full Cost Breakdown for a Dublin Semi-D

Here is where the money goes on a standard rear dormer conversion for a 3-bed Dublin semi-D:

Item	Typical Dublin cost
Structural survey and engineer cert	EUR800-EUR1,500
Truss removal and RSJ steel beams	EUR6,000-EUR14,000
Floor strengthening and boarding	EUR2,500-EUR4,500
Rear dormer structure (walls, flat roof, waterproofing)	EUR10,000-EUR18,000
Velux or dormer window (2 units, fitted)	EUR2,500-EUR5,000
Rafter and floor insulation	EUR2,500-EUR5,000
Staircase (code-compliant)	EUR4,000-EUR8,000
Plasterboard and plastering	EUR3,000-EUR5,000
Electrics (lighting, sockets, smoke alarm)	EUR1,200-EUR2,200
Fire door to landing	EUR400-EUR700
Basic decoration	EUR1,200-EUR2,500
Total without en-suite	EUR36,600-EUR66,400
En-suite plumbing, tiling, fixtures	EUR9,000-EUR15,000
Total with en-suite	EUR45,600-EUR81,400

The truss removal and dormer structure are the two biggest items. Always ask your contractor to quote these separately so you can see what is driving the total.

The Truss Roof Issue in Dublin Estates

Most Dublin estate homes built after 1980 have truss roofs. This is the most common reason quotes come in higher than homeowners expect.

Open your attic hatch and look up. If you see a web of diagonal wooden braces criss-crossing the space, you have a truss roof. The webbing must be removed and replaced with steel RSJ beams before the attic can be used as a room.

Steel beam work in Dublin costs EUR6,000-EUR14,000 depending on how many beams are needed and the span of your house. A mid-terrace needs fewer beams than a wide semi-D.

Always confirm your roof type with your contractor before signing any quote. An experienced Dublin attic specialist can often tell from the outside by looking at the roof pitch and the age of the house.

Dublin Planning Rules — What Needs Permission?

According to planningcheck.ie, based on the Planning and Development Regulations (SI 600/2001):

No planning permission needed:

• Internal conversion with no external changes
• Rear rooflight windows that do not project more than 15cm above the roof surface
• Rear dormers that do not exceed 40m2 total area, meet setback conditions and are not in an ACA

Planning permission needed:

• Any dormer or window visible from the front or a public road
• Hip-to-gable conversions
• Any change in an Architectural Conservation Area that alters external appearance
• Full-width rear dormers in many Dublin neighbourhoods

Always required regardless of planning status:

• Commencement notice submitted before work starts
• Assigned certifier appointed
• Certificate of compliance issued on completion

The planning fee is EUR65. Professional fees for drawings typically add EUR800-EUR2,000, plus a newspaper notice (EUR80-EUR150) and potentially a planning consultant if required (EUR500-EUR1,500).

How Long Does an Attic Conversion Take in Dublin?

Conversion type	Build time	From first call to done
Velux only	3-5 weeks	6-10 weeks
Rear dormer (no en-suite)	5-8 weeks	8-14 weeks
Dormer with en-suite	6-10 weeks	10-16 weeks
Hip-to-gable + dormer	8-12 weeks	14-22 weeks (includes planning)

Dublin peak season is April to September. Booking in this window means waiting 6-10 weeks for a contractor slot. Off-peak (October to February) cuts that to 2-4 weeks with some contractors offering better pricing.

Most of the work happens above your existing ceiling line. You can live normally in the house throughout the build. The most disruptive day is the staircase installation, when the landing ceiling is opened up.

What SEAI Grants Apply in Dublin?

The SEAI does not fund tiles, slates or structural attic work. But combining a conversion with attic insulation qualifies for grants of:

House type	Attic insulation grant (from Feb 2026)
Detached	EUR2,000
Semi-D or end terrace	EUR1,300
Mid-terrace	EUR1,200
First-time buyers / qualifying welfare	Up to EUR2,500

The scaffolding for a dormer conversion gives perfect attic access for insulation work. Doing both at the same time saves one scaffold hire and qualifies for the grant.

Grant approval must come before work starts. Apply at seai.ie/grants.

Does an Attic Conversion Add Value in Dublin?

Yes — consistently and significantly in Dublin's high-demand market.

According to the Society of Chartered Surveyors Ireland (SCSI) House Extension and Conversion Report, attic conversions deliver an average return of 12-15% on property value in Dublin — typically one of the highest ROI home improvements available.

On a Dublin home worth EUR420,000, a 12% uplift is EUR50,400. A conversion costing EUR45,000 with en-suite creates an equity gain of around EUR5,400 — before you count the years of use of the extra room.

Converting is often better value than moving. Stamp duty alone on a larger Dublin property costs EUR12,000-EUR20,000. A conversion at half the cost of moving gives you an extra room without leaving the area.

The condition for value: the conversion must be properly certified. A commencement notice, an assigned certifier and a certificate of compliance must be in place. Without these, the conversion has no legal status.

How to Get a Fair Quote in Dublin

Before calling anyone:

• Check if your home is in an ACA (dublincity.ie)
• Open the attic hatch and identify cut roof vs truss roof
• Measure the centre-point head height
• Decide what you want: bedroom only, bedroom with en-suite, home office

Getting quotes:

• Get three written quotes from Dublin-based contractors with specific attic experience
• Check CIF membership at cif.ie or CIRI at ciri.ie
• Ask each contractor to quote the same spec on the same conversion type
• Ask specifically: does this quote include commencement notice handling and engineer cert?

Payment structure: Standard for Dublin attic conversions is three stages — deposit at start (20-30%), second payment at structural completion and balance on finished job. Never pay more than 30% upfront.

Red Flags in Dublin Attic Conversion Quotes

No mention of commencement notice or engineer cert.
Every attic conversion needs both. If a contractor does not raise this, they may not be planning to do it properly — which means a legal problem at sale time.

Quote significantly below the other two.
In Dublin, a quote 30%+ below competitors usually means structural steel work has been left out, or the staircase is not included, or the quote assumes an overlay rather than proper floor strengthening.

Spray foam insulation proposed.
Standard practice is mineral wool or rigid board. Spray foam in an attic creates resale problems. Any contractor recommending spray foam should explain why in writing.

Full payment before work starts.
Always pay in stages. Paying everything upfront removes your only protection if problems arise.

No clear position on conservation area rules.
If your home is pre-1940 and a contractor has not asked about your conservation status, they may not know what they are doing in that context.

Frequently Asked Questions

How much does an attic conversion cost in Dublin in 2026?

Most Dublin homeowners pay EUR25,000-EUR55,000 for a completed conversion. A basic Velux-only conversion starts around EUR20,000-EUR30,000. A rear dormer with en-suite runs EUR42,000-EUR62,000. Prices are 12-15% above the national average due to higher labour costs and access constraints.

Do I need planning permission for an attic conversion in Dublin?

Not for an internal conversion or a standard rear dormer on most houses. Planning is required for front-facing dormers, hip-to-gable work, and any changes visible from the road. If your home is in an Architectural Conservation Area, check with Dublin City Council before proceeding.

Why is my quote so much higher than online estimates?

The most common reason is truss roof work. Homes built after 1980 need steel RSJ beams installed before conversion can begin. This adds EUR6,000-EUR14,000 to any quote and is often not included in online headline figures.

Can I call an attic conversion a bedroom when selling?

Only if it is legally a habitable room — meaning 2.4m head height over 50% of the floor area, a compliant staircase, proper fire safety and a certificate of compliance. Most standard conversions without a dormer do not meet this standard. You can list it as a converted attic, which buyers recognise and value.

How long does a Dublin attic conversion take?

A Velux-only conversion takes 3-5 weeks on site. A dormer conversion takes 5-8 weeks. From first call to completion, allow 8-16 weeks for most Dublin projects, longer if planning permission is required.

What SEAI grants can I claim?

You can claim EUR1,200-EUR2,500 for attic insulation if combined with the conversion, depending on house type and your status. Apply at seai.ie before work starts. Grant approval must come before work begins.

Conclusion

An attic conversion in Dublin costs more than anywhere else in Ireland. But it also adds more value. Space in Dublin is expensive, demand is strong and a properly certified extra room commands a real premium in the market.

The Dublin-specific things to watch: check your ACA status before designing anything, confirm your roof type before accepting any quote, insist on a commencement notice and cert from day one, and use a contractor with proven Dublin attic experience — not just a general builder who has done a few jobs.

Get three written quotes, pay in three stages and do not let anyone skip the paperwork.

Use the free attic conversion cost calculator to get a Dublin-specific estimate before you call anyone.

Internal links: Attic conversion cost Ireland · Attic conversion cost calculator · Dormer attic conversion cost Ireland · SEAI roof insulation grant 2026 · Roof cost Dublin

Outbound links

• SCSI
• Dublin City Council planning
• BCMS commencement notice
• SEAI grants
• CIF
• planningcheck.ie

Prices reflect April 2026 Dublin contractor rates. Always get three written quotes from CIF or CIRI registered contractors.