What Does an Attic Conversion Actually Cost in Dublin?

Every contractor website says "starting from €19,000" - no year on it, no word on whether VAT is in it. Every online estimator gives you a tidy number. And then reality hits. Here's what an attic conversion actually costs in Dublin in 2025/26 - from someone who's been through it, written the cheques, and dealt with the surprises.

The headline numbers

Let's start with the ballpark. The four ranges below are ours: quotes we were given and invoices we paid, for Dublin, in 2025/26, with VAT included. They are our experience rather than a survey, and we are not going to dress them up as one.

Our figures. Dublin, 2025/26, VAT included.

The two numbers people quote at us most often are not ours at all, so they get their own tiles and their own label:

Those two are onlinetradesmen.ie's own averages - a lead-generation directory publishing on the market it sells into - as reported by The Irish Times on 26 April 2024. That makes them April 2024 figures at the latest, on a page that is otherwise 2025/26. Neither the directory nor the newspaper says whether they include VAT, so we cannot tell you either. We keep them because they are the only published Dublin-versus-rural comparison we can find for Irish attic conversions, and we label them because they are not evidence of what a conversion costs - only evidence of what is being claimed. Links checked 8 September 2026.

Price per square metre typically lands between €1,000 and €1,600/m² - again our own figure, Dublin, 2025/26, VAT included - depending on spec.

Where these numbers come from

There is no official Dublin attic-conversion cost benchmark. We went looking for one, precisely so this page would not have to lean on a directory's figures, and it does not exist. Here is what we checked on 8 September 2026, so you can check it yourself.

• The Society of Chartered Surveyors Ireland is the body we would normally treat as the authority on Irish construction costs. Its only attic-specific costing is a consumer question dated November 2013: about €15,000 to €16,000 for a traditional cut timber roof, and in the order of €25,000 for a prefabricated trussed roof. No VAT basis, no floor area, no Dublin split, and thirteen years old. We are not going to inflate it forward and present the result as a 2026 Dublin number.
• The SCSI House Rebuilding Guide is current, but it measures the minimum insurance reinstatement cost of a whole estate-type house, demolition and site clearance included. That is a different thing from a conversion, and repurposing it as one would be a straightforward factual error.
• The SCSI Real Cost of Renovation report costs whole vacant and derelict properties brought back to residential use. Again: a property, not an attic.
• The SCSI Construction Cost Index reports how costs have moved, not what a job costs. An index gives you a percentage, and multiplying a 2013 figure by it to manufacture a 2026 average would be interpolation dressed as sourcing.

So the €34,000 and €28,000 tiles above carry a lead-generation directory's name because that is genuinely whose figures they are, and everything else on this page is ours - what we were quoted, what we paid, and what we have watched other Dublin homeowners pay. We would rather say that plainly than launder a directory's marketing data into a benchmark by attaching a newspaper's name to it.

What's typically included in a quote

A "standard" attic conversion quote from a reputable Dublin contractor should include the following. If any of these are missing, ask why.

• Structural steelwork - RSJ beams to support the new floor and any roof modifications
• Staircase - fixed, building-regulation compliant (not a loft ladder)
• Velux windows - usually 2 large rear windows + 2 smaller ones if ensuite
• Insulation - spray foam or rigid board (Kingspan/Xtratherm) between and under rafters (see our spray foam vs Kingspan insulation guide)
• Electrical first fix and second fix - sockets, switches, light fittings, smoke alarm
• Plumbing - if ensuite is included (waste, water supply, shower tray)
• Plastering and painting - typically to "builders finish" (one coat)
• Fire doors - required by building regulations on all bedroom doors
• Smoke and heat alarms - interconnected, as required by regs

What's usually NOT included (the hidden extras)

This is where the gap between "the quote" and "what you actually spend" gets real. Based on our own experience and what we hear from other Dublin homeowners, budget for these on top of your main quote.

Every figure below is a 2025/26 Dublin budget with VAT included. The trade prices are what we were charged; the shop-bought items are retail prices, which already carry VAT on the shelf.

The real cost gap

We won't publish exact invoices, but here's the honest picture based on real experience. All three bars are Dublin, 2025/26, VAT included:

The gap between "starting from €19,000" - an advertised headline that almost never states its year or whether VAT is in it - and what you actually write cheques for in 2025/26 is typically €5,000 to €10,000, VAT included. Not because builders are dishonest - but because "builders finish" genuinely doesn't include everything you need to actually use the space.

Ensuite: the biggest cost decision

Adding an ensuite is the single biggest cost variable. It's also the decision most people agonise over. Here's the reality, in 2025/26 Dublin money with VAT included:

• A simple ensuite with gravity-fed waste adds €4,000-€7,000 to your conversion
• If you need a macerator pump (waste stack too far from the bathroom), add another €1,000-€2,000
• Proximity to the existing waste stack is everything - if the bathroom can sit near or above the existing stack, it's much cheaper
• In a new build, the waste pipe routing is often more straightforward than in older houses

How to compare quotes

Getting three quotes is standard advice. Making sure they're actually comparable is the hard part. Our guide to choosing a contractor covers vetting in depth, but here's what to check on the quote itself:

A note on online estimates

You'll find figures online ranging from €12,000 to €55,000+, and the first thing to notice is that almost none of them tells you which year it is for or whether VAT is in it. The low end is almost always outdated, or refers to the most basic conversion possible in a rural area. The high end includes dormers, full bathrooms, and premium finishes.

The realistic middle ground for a Dublin home in 2025/26 is - our own figures again, VAT included:

These numbers account for the hidden extras. If a quote seems significantly below these ranges, make sure you understand exactly what's included - and what you'll need to pay for on top.

Is it worth it?

An attic conversion in Dublin typically adds €40,000-€60,000 to your property value - well above the cost in most cases. Be clear about what that figure is: it is our own read of the Dublin market in 2025/26, not a valuer's benchmark. No Irish primary source publishes a current uplift figure for an attic conversion. The nearest thing that exists is the same SCSI consumer question cited above, which put the uplift at about €25,000 in November 2013. Beyond the numbers, it adds a usable room (or two) without extending your footprint, without planning permission headaches, and often within 6-8 weeks.

The key is going in with realistic expectations about cost. The "starting from" prices online are technically true - but by the time you have a finished, usable space you're proud of, you'll have spent more. That's not a bad thing - it's just the reality.