Free building cost calculators
Set a realistic budget before you talk to anyone. Six calculators, 2026 prices for Dublin and the rest of Ireland, about a minute each.
- 5.0 on Google
- Free, no sign-up
- VAT included
Most used
Try it here: extension cost
€84,000 to €124,000
Total budget to plan for, including VAT at 13.5%, professional fees and a 15% contingency.
Add more space
Renovate rooms or a whole house
Three ways to add space, compared
If you need another room, converting space you already have is usually cheaper and quicker than building out. Dublin prices, including VAT.
Garage conversion
From €18,000
- Per m²
- €1,200 to €1,800
- On site
- 6 to 8 weeks
- Planning
- Usually exempt
Attic conversion
From €22,000
- Per m²
- Priced by type
- On site
- 6 to 10 weeks
- Planning
- Often exempt
House extension
From €40,000
- Per m²
- €2,700 to €3,400
- On site
- 12 to 16 weeks
- Planning
- Exempt to 45 m² at the rear
How our calculators work
- 01
2026 Irish prices
Separate rates for Dublin and the rest of Ireland, the same figures we use in our cost guides.
- 02
Nothing hidden
VAT, professional fees and a contingency are shown as their own lines, so you see what makes up the total.
- 03
A minute, no sign-up
No email and nothing to download. Send us the estimate only if you want a proper quote.
Got your number? Get a real price.
A calculator gets your budget right. A free call-out gets the price right. We visit anywhere in Dublin and north Wicklow and follow up with a detailed written quote.
About our calculators
Questions about a price? Call 01 270 9764 and we’ll talk it through.
Are the calculators free?
Yes. There's no sign-up and nothing to download. You get a cost range straight away, and you only hear from us if you choose to send the estimate or book a call-out.
Where do the prices come from?
From 2026 Irish build rates, with separate figures for Dublin and the rest of Ireland. They are the same figures we use in our cost guides.
Do the estimates include VAT?
Yes, the construction costs include VAT at 13.5%. Professional fees and contingency are shown separately where they apply, so you can see what makes up the total.
Is the estimate the price I'll pay?
No. It's a budget range to plan with. Ground conditions, drains and the condition of the existing house only show up on a visit, so the price you pay comes from a written quote after a free call-out.