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Garage Conversion Cost Calculator

See what your garage conversion could cost in 2026, with real Dublin and national pricing. Get an instant estimate by conversion purpose, not just floor area.

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Add-ons

Add a kitchenette
+€4,000 to €9,000
Bi-fold or sliding doors instead of a standard wall and window
+€3,000 to €7,000
Additional glazing or rooflight
+€1,500 to €4,000
Underfloor heating
+€1,500 to €3,500

estimated construction cost

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select options above

engineer and compliance fees

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floor and structural sign-off

contingency

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recommended reserve, not part of build cost

suggested maximum budget

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build + add-ons + fees + contingency

Select your garage size and conversion purpose above to see your estimate.

Cost breakdown

Typical additional costs not included above

Skip hire and waste€180 to €350
Boiler capacity upgrade, if needed€1,200 to €3,500

These figures are estimates for planning purposes only, including VAT at 13.5% on qualifying construction services. A written quote from a contractor who has visited your property is the only accurate figure. Most garages sit below the house's damp proof course, so raising or replacing the floor slab is one of the biggest and most consistent cost drivers in a garage conversion, which is why it is included in the base estimate rather than treated as an optional extra.

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How this price calculator works

This calculator prices your garage conversion by purpose first, home office or studio, bedroom, bedroom with ensuite, or self-contained annex with kitchen and bathroom, using build cost ranges for a single attached garage in Dublin and the rest of Ireland. A garage’s footprint barely changes from project to project, so plumbing and kitchen requirements move the price far more than floor area does, which is why purpose sets the base cost rather than size alone. Figures include labour, materials and VAT at 13.5% on qualifying construction services.

Double garages use a size multiplier rather than a straight doubling of the single garage price, since floor preparation, damp-proofing and roof work do not fully double for the extra footprint. Detached garages carry an additional services connection cost, since water, drainage and electrics need to be run from the main house, work an attached garage does not need.

Most garages sit below the house’s damp proof course, so raising or replacing the floor slab is one of the most consistent cost drivers in a garage conversion. That work is included in the base estimate rather than treated as an optional extra, so the headline figure reflects what these projects actually involve. Planning permission only adds a cost once you confirm it is required, it is not assumed for you.

Frequently asked questions

Still have questions about your project? Call 01 270 9764 – we’ll be happy to help!

It gives a realistic planning range based on current Irish market rates and your specific inputs, not a fixed price. A written quote from a contractor who has visited the property is the only accurate figure for a specific project.

Garage footprints are fairly fixed, so floor area does not vary much between projects. What actually changes the cost is whether plumbing, a kitchen or an ensuite is involved, which is why the calculator prices by conversion purpose first.

Most garages sit below the house's damp proof course, so the floor slab usually needs to be raised or replaced to meet Building Regulations. This is one of the most consistent costs in a garage conversion, so it is built into the base estimate rather than added later as a surprise.

Often, yes. A detached garage needs water, drainage and electrics run from the main house, which an attached garage already has close by. The calculator adds this as a separate services connection cost.