Quantity Surveyor Fee Calculator
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Typical QS Fee Rates by Project Type 2025/26
| Project Type | Full Service | Cost Plan Only | BoQ Only |
|---|---|---|---|
| Residential New Build | 1.5–2.5% | 0.5–0.9% | 0.6–1.0% |
| House Extension | 2.0–3.5% | 0.7–1.2% | 0.8–1.4% |
| Commercial Fit-Out | 1.0–2.0% | 0.35–0.7% | 0.4–0.8% |
| Refurbishment | 1.5–3.0% | 0.5–1.0% | 0.6–1.2% |
Note: All figures are approximate market rates and exclude VAT. Actual fees depend on project complexity, location, and the specific QS practice. RICS no longer publishes mandatory fee scales.
When Does a QS Pay for Itself?
Research consistently shows that early QS involvement saves money. Key scenarios where QS fees are recouped many times over:
- Tender analysis: Identifying an inflated or incomplete tender can save 5–15% of contract value
- Variations management: Controlling unauthorised or inflated variation claims
- Final account: Negotiating a fair final account settlement, avoiding overpayment
- Budget control: Flagging cost overruns early when they can still be addressed
Rule of thumb: For any project over £150,000, professional QS involvement is likely to save at least its own cost. For projects over £500,000, it is almost always essential.
How to Use This Calculator
1
Select your project type
Choose from residential new build, house extension, commercial fit-out, or refurbishment. Different project types attract different fee rates due to complexity, risk, and the nature of the QS work involved.
2
Enter the contract or project value
Use your total construction budget or the contract sum. If you don't yet have a firm cost, use your target budget or architect's preliminary estimate. The QS fee is calculated as a percentage of this figure.
3
Select the service level required
Full QS service covers the entire project lifecycle. Cost plan only is appropriate if you just need a budget check. Bills of quantities suits larger projects going to competitive tender. Employer's agent is relevant for design-and-build contracts.
4
Review the fee range
The calculator shows both a low and high fee estimate based on typical market rates. Use this as a benchmark when seeking quotes from RICS-regulated firms. Always obtain at least 2–3 competitive quotes.
5
Factor in VAT and scope
Remember all QS fees are subject to 20% VAT. Ensure the scope of service is clearly agreed in writing before appointment — disputes over what is and isn't included in the fee are a common source of problems on construction projects.
Frequently Asked Questions
What does a quantity surveyor do?
A quantity surveyor (QS) manages the financial aspects of construction projects. Their core services include: preparing cost estimates and budgets, producing bills of quantities (detailed lists of materials and work), tendering and procurement advice, valuing work in progress for interim payments, managing variations and change orders, and preparing the final account at project completion. They essentially act as the financial guardian of a construction project.
How much does a quantity surveyor cost?
QS fees in the UK typically range from 1–3.5% of the contract value for a full service, depending on project type and complexity. For a residential new build worth £300,000, expect to pay £4,500–£9,000 for a full QS service. House extensions often have a minimum flat fee of £1,500–£5,000 regardless of percentage, as the fixed overhead of the service makes very small projects uneconomical at percentage rates alone.
What is a bill of quantities?
A bill of quantities (BoQ) is a detailed document produced by a QS that lists every item of work, material, and labour required for a construction project in a standardised format. It allows different contractors to price from the same document, making tender comparisons straightforward and fair. BoQs are standard practice on larger commercial and public sector projects; they are used less frequently on smaller residential works where a detailed specification suffices.
When do I need a QS?
You benefit most from a QS on: new build projects over £100,000, where budget overruns are a significant risk; complex extensions or refurbishments; commercial fit-outs; any project using a standard JCT or NEC contract; disputes or claims over variations; and projects where you need independent cost certification for funders or self-build mortgage drawdowns. For small extensions under £50,000, a cost plan from an experienced builder or architect may suffice.
What is the RICS fee scale for QS services?
The RICS no longer publishes mandatory fee scales — fees are commercially negotiated. However, RICS member firms typically charge within market norms of 1–3.5% for full services on residential projects and 0.75–2% on larger commercial schemes, reflecting economies of scale. Always obtain 2–3 quotes from RICS-regulated firms and ensure the scope of service is clearly defined before agreeing fees.
Can I use a QS for a house extension?
Yes, and for larger or complex extensions it can be very worthwhile. A QS can prepare a cost plan to check builder quotes are reasonable, produce a specification to ensure consistent quoting, act as employer's agent under a building contract, certify interim payments, and manage the final account. For smaller extensions (under £50,000), many homeowners find the cost of a full QS service is hard to justify, but a one-off cost check or budget review can still be cost-effective.
What is a cost plan?
A cost plan is an estimate of the likely cost of a construction project, prepared at various stages of design development. Early-stage cost plans (RIBA Stage 2) are based on elemental rates per m² and give a broad budget figure. Later cost plans (RIBA Stage 4) are more detailed, incorporating the full design information. A cost plan helps clients understand the budget implications of design decisions before committing to tender.
What is a QS employer's agent role?
As employer's agent (EA), the QS acts on behalf of the client in administering the building contract — particularly design-and-build contracts. Responsibilities include issuing instructions and variations, certifying payments, granting extensions of time, and agreeing the final account. The EA role replaces the traditional architect's contract administration function on D&B projects and is common in housing development and commercial construction.
What qualifications does a QS need?
Qualified quantity surveyors hold a degree in quantity surveying or construction cost management, plus chartered status with the RICS (MRICS or FRICS). Chartered status requires typically 2 years post-qualification experience and passing the RICS Assessment of Professional Competence (APC). The Chartered Institute of Building (CIOB) also offers routes to chartered status. When engaging a QS, always check they are RICS-regulated for professional standards and indemnity insurance.
How is a QS fee calculated?
QS fees are usually calculated as a percentage of the contract value, though fixed lump sums and time-charge arrangements (day rates of £600–£1,200/day) are also common. The percentage rate decreases as project value increases — a £100,000 project might attract 3%, while a £5m project might attract 1%. The service scope also affects fees: a full service from RIBA Stage 2 through to final account completion is significantly more expensive than a cost plan only.
What is the difference between a QS and a project manager?
A QS focuses primarily on cost — estimating, budgeting, procurement, valuation, and financial management of the contract. A project manager focuses on programme — time, resource management, coordination, and risk. On smaller projects, a QS may take on project management responsibilities; on larger projects, both roles are typically filled separately. Some construction professionals hold dual qualifications in both disciplines.
Are QS fees VAT-able?
Yes. Quantity surveying services are standard-rated for VAT purposes at 20%. VAT-registered QS practices will charge VAT on their fees. VAT-registered businesses can reclaim input VAT; private individuals and non-VAT-registered businesses cannot. For residential self-builders, the QS fee VAT is generally not recoverable under the DIY VAT reclaim scheme, which covers only goods (materials) not professional services.