Average cost breakdown
| Item | Low | Mid | High |
|---|---|---|---|
| Single-storey (per m²) | €2,400 | €2,900 | €3,400 |
| Two-storey (per m²) | €2,200 | €2,700 | €3,200 |
| Typical 20m² kitchen extension | €48,000 | €60,000 | €72,000 |
| 40m² two-storey | €88,000 | €108,000 | €130,000 |
Factors affecting price
- Planning vs exempt development
- Site access
- Foundation type
- Glazing and roof lights
- Internal finish standard
How to get the best quote
- Engage an architect early
- Confirm exempt development status
- Get fixed-price tenders
- Hold 10% retention until snags fixed
Get free quotes now
Compare verified extension quotes from local Irish tradespeople — free and in under 3 hours.
Compare quotes free