PRICE GUIDE · TRADES & CONSTRUCTION · 2026–2027
Basement Conversion cost in Ireland
€40,000–€150,000 per project. Typically €80,000.
A basement conversion in Ireland costs €40,000–€150,000 per project, typically around €80,000. The price is set by convert existing vs dig/lower, waterproofing (tanking) and drainage and structural/underpinning work.
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HOW MUCH IT COSTS
How much does basement conversion cost in Ireland?
| Low end | €40,000 | a simple job, off-peak, outside the cities |
|---|---|---|
| Typical | €80,000 | what most people pay |
| High end | €150,000 | the biggest jobs, short notice, Dublin |
Locufy guide prices for 2026–2027. Updated 2026. A national range, not a quote — enter your town above for real prices from the builders and trades near you.
What moves the price
- Materials used — waterproofing systems, insulation and floor finishes vary widely in price, and a basement conversion needs each of them.
- Size of the space — a full basement conversion needs more insulation, flooring and finishing than a partial one.
- Its current condition — a damp or flooded basement needs tanking and drainage work before any conversion can begin.
- Complexity of the project — structural modifications or a new egress window add design and building work to the basement.
- Digging out or lowering the floor — excavating for more head height adds underpinning and spoil removal, which costs far more than converting the existing basement.
Services for the maintenance and repair of the dwelling prices in Ireland are up 23% over five years (CSO Consumer Price Index, Services for the maintenance and repair of the dwelling, to 2025 December). Five years ago a typical basement conversion would have cost about €64830 — an estimate from today's guide price and that index, not a recorded price. Source: CSO CPM18, CPM12 →
WHAT YOU GET
What a basement conversion booking includes
Takes: The duration of a basement conversion can range from a few weeks to several months, depending on the scope of the project..
WHAT PEOPLE BOOK
Common basement conversion jobs
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Basement Conversion near you, with prices shown
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How to pay less
- Converting the existing basement space without lowering the floor costs far less than digging out for extra head height.
- A partial basement conversion, such as a home gym or study in part of the space, costs less than a full conversion.
- Fixing damp or a leak early, before it soaks into the walls, keeps the waterproofing work in the basement smaller.
- Choosing standard flooring, lighting and wall finishes rather than bespoke ones lowers the cost of the basement finishing stage.
- Adding a basement bathroom during the main conversion, rather than later, saves opening up walls and plumbing a second time.
Before you book
- Access to the basement for assessment and measurements.
- Any existing plans or blueprints of your home.
- Your vision or ideas for the new space, including desired features.
- Clear access routes for materials and equipment during construction.
- You can ask the builder how many basement conversions they have completed and how the work will meet building regulations.
Basement Conversion cost: questions people ask
The cost of a basement conversion can vary significantly based on factors such as size, complexity, and the materials used. Additional costs may arise from necessary structural work, damp proofing, and the quality of finishes selected.
The duration of a basement conversion can range from a few weeks to several months, depending on the scope of the project. Factors such as design complexity, required approvals, and contractor availability can all affect the timeline.
While general contractors can handle many aspects of a basement conversion, hiring specialists may be necessary for specific tasks such as electrical, plumbing, or structural work. It's important to ensure all work complies with local regulations.
Emergency or same-day services for basement conversions are typically not available due to the complexity of the work involved. Most projects require careful planning and scheduling to ensure quality and compliance with regulations.
Yes, many contractors offer package deals for multiple related jobs, such as basement conversions combined with renovations in other parts of the home. This can often lead to cost savings and a more streamlined process.
Out of scope work may include extensive landscaping or external modifications that are unrelated to the basement itself. It's also important to clarify that certain upgrades, like luxury finishes or additional rooms, may not be included in standard conversion packages.