VAT on home extensions in Ireland explained, including current rates, how VAT applies to labour and materials, and how it affects total project cost.
1. Overview
VAT is one of the most commonly misunderstood elements of extension pricing in Ireland.
While extension costs are often discussed in €/m² terms, VAT can materially alter the final project budget.
For most residential extensions in Ireland, construction services are subject to:
13.5% VAT
However, how VAT applies depends on:
- Whether the contractor is VAT registered
- Whether pricing is quoted inclusive or exclusive of VAT
- Whether works are considered renovation or new build
- Whether materials are supplied and installed
Failure to clarify VAT status can result in 10–15% budget discrepancies.
2. Current VAT Rates Relevant to Extensions (2026)
| Type of Work | VAT Rate |
|---|---|
| Residential construction services (extensions, renovations) | 13.5% |
| Professional services (architect, engineer, QS) | 23% |
| Standalone material supply (retail purchase) | 23% |
| New build residential construction (certain cases) | 13.5% or 0% (subject to conditions) |
Most standard home extensions fall under 13.5% VAT on construction labour and materials supplied by the contractor.
Professional services are typically charged at 23%.
3. Inclusive vs Exclusive Pricing
Some contractors quote:
- Inclusive of VAT (price shown is final construction cost)
- Exclusive of VAT (VAT added on top)
This distinction significantly affects €/m² comparisons.
Example: 30m² Extension
Quoted at €90,000 (ex VAT)
VAT at 13.5% = €12,150
Total payable = €102,150
Effective €/m² increases from:
€3,000 → €3,405
This is a material difference when comparing contractors.
4. VAT on Professional Fees
Professional services are typically charged at:
23% VAT
Example:
Architect fee: €8,000
VAT at 23%: €1,840
Total: €9,840
This VAT rate is higher than construction VAT and should be budgeted separately.
5. VAT and Materials Supply
If materials are:
Supplied and installed by a VAT-registered contractor → 13.5%
If purchased separately from a retailer → 23%
This distinction matters when:
- Clients supply kitchens directly
- Clients purchase windows separately
- Fixtures are bought independently
It can create uneven VAT treatment across the project.
6. VAT on Stage Payments
VAT is typically charged on each stage payment.
Example:
Stage payment: €20,000
VAT (13.5%): €2,700
Total payable: €22,700
Cash flow planning must account for VAT being paid progressively.
7. VAT and Reduced Rates (Renovation Context)
Certain renovation or energy upgrade works may qualify for:
Reduced VAT rates or grant-supported structures (in specific contexts).
However, most standard domestic extensions are subject to the standard 13.5% construction rate.
Special VAT treatments are rare for typical rear extensions.
8. VAT and Budget Planning Example
40m² Standard Extension
Construction cost (ex VAT): €120,000
VAT at 13.5%: €16,200
Professional fees (ex VAT): €12,000
VAT on professional fees (23%): €2,760
| Item | Cost |
|---|---|
| Construction incl VAT | €136,200 |
| Professional fees incl VAT | €14,760 |
| Subtotal | €150,960 |
| Contingency (7%) | €8,400 |
| Total Project Budget | €159,360 |
VAT increases total project cost by over €18,000 in this scenario.
9. Common VAT Mistakes
- Comparing quotes where one includes VAT and one does not
- Assuming professional fees are subject to 13.5% instead of 23%
- Forgetting VAT when calculating €/m²
- Overlooking VAT on variations
- Confusion over materials purchased independently
These misunderstandings frequently create unexpected cost increases.
10. VAT and Contractor Registration
If a contractor is not VAT registered:
- They cannot charge VAT
- They also cannot reclaim VAT on materials
This can affect pricing structure and competitiveness.
Most reputable contractors operating at extension scale are VAT registered.
11. VAT and Cash Flow Impact
VAT increases:
- Stage payment amounts
- Total financing required
- Mortgage drawdown levels
VAT is paid during the build; it is not deferred.
For large extensions, VAT can exceed €20,000.
12. Summary
For most Irish house extensions:
Construction VAT = 13.5%
Professional fee VAT = 23%
VAT materially increases total project cost and must be factored into early budgeting.
A €100,000 construction cost typically becomes €113,500 before professional fees.
Clarity on VAT inclusion is essential when comparing quotes.
13. Other Resources:
Extension Cost per Square Metre
Single vs Double Storey Extension Costs
Structural Steel and Foundation Costs