Quantity Surveyor for a Self-Build in Ireland — When to Hire One and What It Saves
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Quantity surveyor: €2,500–€5,000 for a self-build cost plan. Saves €10k–€30k in over-spec'd finishes and missing line items.
Quantity surveyor (QS) for a self-build in Ireland: €2,500–€5,000 for a full cost plan. Saves €10k–€30k in over-spec'd finishes and missing line items. Hire at the same time as the architect, before the building contract is signed. The QS reviews the design and the spec against the budget and flags: over-spec'd finishes (e.g. marble worktop when the budget allows quartz), missing line items (e.g. no allowance for the MVHR ductwork), and site-specific cost overruns (e.g. long connection runs not in the builder's price). Most lenders require a QS report for a self-build mortgage. Even if your lender doesn't, a QS report is the cheapest €2,500–€5,000 you can spend on the project.
When this matters most
You're at the pre-construction phase and shaping the cost plan.
When this doesn't apply
The cost plan is agreed and the building contract is signed.
Sources
SCSI, Find a quantity surveyor. https://www.scsi.ie/
Frequently asked questions
How much does a quantity surveyor cost for a self-build in Ireland?
€2,500–€5,000 for a full cost plan. Saves €10k–€30k in over-spec'd finishes and missing line items. Most lenders require a QS report for a self-build mortgage.
When should I hire a QS for a self-build?
At the same time as the architect, before the building contract is signed. The QS reviews the design and the spec against the budget.
What does a QS do for a self-build?
Reviews the design and the spec against the budget. Flags over-spec'd finishes, missing line items, and site-specific cost overruns. Produces a cost plan the lender accepts for the mortgage application.
When this matters most
You're at the pre-construction phase and shaping the cost plan.
When this doesn't apply
The cost plan is agreed and the building contract is signed.
Where to go next
Next decision
The next step in your build sequence.
- Contingency Budget for a Self-Build in Ireland — Why 10% Is the Minimum and 15% Is Safer →
- First Home Scheme in Ireland — Equity Share for New Builds, Eligibility, and the Catch →
- Self-Build Mortgage Step by Step in Ireland — Application to Final Drawdown →
- Stage Payment Triggers in a Self-Build — What Each Drawdown Requires →
- VAT on a Self-Build in Ireland — 13.5% Labour, 23% Materials, and the Sole Trader Route →
Branch into
Adjacent decisions at the same stage.
Watch out for
Common mistakes, hidden costs, gotchas.
- Grants for Self-Build in Ireland 2026 — SEAI, Help-to-Build, and the Eligibility Trap →
- Hidden Costs of a Self-Build in Ireland — The 12 That Catch First-Timers →
- Mortgage Interest During Build in Ireland — How It Works, What It Costs, and the Trap →
- Self-Build Cost per m² in Ireland 2026 — Total Project Cost and the Line Items →
- Single-Storey vs Two-Storey Cost in Ireland — Which Is Cheaper, Which Is More Cost-Efficient →
Compare with
Alternative approaches worth knowing.