A quantity surveyor is a cost specialist who prices a construction project, writes the detailed documents that builders price against and tracks your spending. They do not inspect homes for defects or carry out structural surveys. On a small extension you can often manage without one, while Grand Designs magazine says that for most self-builds and complex historic renovations skipping one would likely be a false economy.
What a quantity surveyor is
The Royal Institution of Chartered Surveyors (RICS) lists quantity surveying among the surveying specialisms. RICS says chartered surveyors include quantity surveying, which makes sure the financial position of construction projects is accurately reported and controlled effectively. They track what you are spending against your original budget.
Quantity surveyors calculate and manage the costs of all aspects of a construction project. To achieve chartered status, MRICS members must pass the assessment known as the APC.
How a quantity surveyor differs from a house surveyor
The residential surveyors listed on this directory inspect property condition before you buy. They use three RICS levels to report on a home, and none of these professionals calculate construction costs or manage building budgets.
Level 1 describes condition, flags risks and urgent defects, and suits conventional, newer homes in good condition. Inspections take roughly one to two hours, and typical 2026 ranges are roughly £300 to £450. Level 2, still widely called a HomeBuyer Report, suits conventional homes in reasonable condition. It adds advice on repairs and maintenance, and comes as a survey only or a survey and valuation. This is a visual, non-intrusive inspection taking two to four hours, with typical 2026 ranges of £400 to £950.
Level 3, still widely called a building survey or full structural survey, is the most detailed option. It suits older, larger, altered, unusual or run-down homes, or homes you plan to alter. Inspections take four to eight hours, and typical 2026 prices range from £600 to £1,500 or more. Reports use condition ratings shown as traffic lights, and usually follow within about three to ten working days.
If you are buying a new-build property, you may use a snagging survey instead to catch defects before you move in. The process differs across the UK. In Scotland, the seller provides a Home Report before marketing, which includes a Level 2 survey and valuation. A mortgage valuation is not a survey at all, as it is just a limited check for the lender's benefit.
Choosing the cheapest survey level for an old or altered house is a common mistake. You must also read the terms of engagement carefully, so you are not surprised when the surveyor does not lift carpets, move furniture or test services. Buyers sometimes compare quotes that are for different levels or exclude a valuation, which leads to poor decisions. Once you receive the report, never ignore recommendations for further investigation, and do not try to renegotiate the purchase price without getting written repair quotes first. Always book the survey once your offer is accepted and well before exchange, as booking too late will delay the transaction.
Good advice is to match the survey level to the age, type and condition of the property. You should get two or three like-for-like quotes that state the level, whether a valuation is included and the turnaround time. Ask the surveyor about their experience with that property type and the local area, and check whether they will talk the report through by phone afterwards. Use the survey findings to get repair quotes, then decide whether to proceed, renegotiate or walk away, keeping your conveyancer involved throughout.
How a quantity surveyor differs from a party wall surveyor
If you are building an extension or a basement, you might be told you need a surveyor to handle boundary paperwork. This is a party wall surveyor, which is an entirely different role from a quantity surveyor.
The Party Wall etc. Act 1996 applies in England and Wales only. Under this law, a building owner must give written notice before building on or at the boundary, working on an existing party wall or structure, or excavating near a neighbour's foundations. Notice is at least two months ahead for party structure works and one month for new boundary walls and excavations.
The neighbour has 14 days to respond to the notice, and silence counts as a dispute. In a dispute, the owners must appoint one agreed surveyor or one each, who will then produce a party wall award. You cannot act as your own surveyor for this process. The building owner usually pays all surveyors' fees where the work is solely for their benefit, and an award can be appealed in the county court within 14 days.
Starting party wall work without serving notice is a serious error that can lead to an injunction, halting your build entirely. A quantity surveyor does not handle this legislation, so read the guide on when you need a party wall surveyor if your project affects a neighbour.
What a quantity surveyor does on a home project
A quantity surveyor takes your approved architectural plans and turns them into a financial reality. They put a cost on the project from your drawings, which gives a baseline to compare builders' prices against.
During the project, they perform several key tasks:
- Calculate and manage the costs of all aspects of a construction project.
- Produce a detailed cost plan of your project based on the drawings.
- Work with your architect on a tender document and bill of quantities.
- Negotiate with building contractors on your behalf.
- Project-manage the build for the client if hired to do so.
They track spending throughout the construction phase. Check exactly which of these tasks are included in the fee before you agree it.
Cost plans and bills of quantities explained
A cost plan is produced early in the design stage. It gives you a baseline to compare contractor tenders against. This document is based on your drawings and can be compared with contractor tenders.
A bill of quantities is a highly detailed document in which all the build elements are broken down and itemised. This document is put out to the building trades for contract.
Because every builder prices against the same itemised document, a bill of quantities can help you compare quotes like for like. Without one, builders may read the drawings differently, which can make their prices harder to compare.
Should you hire a quantity surveyor or an estimator?
An estimator is a cheaper alternative for some projects. On 2018 prices an estimator costs around £350, so that figure may be out of date.
An estimator is usually the more cost-effective choice when the designer has produced a fairly standard project with a single contractor and easy site access. They simply provide the numbers you need to get the project started.
A quantity surveyor is generally better value for projects with multiple contractors, a difficult site or significant complexity.
Is a quantity surveyor worth paying for?
There is no legal requirement to use a quantity surveyor on a residential project. A small extension can usually be managed without one, especially if you are using a single trusted builder and standard materials.
However, Grand Designs magazine says that for most self-builds and complex historic renovations, skipping one would likely be a false economy.
A quantity surveyor will not automatically cut builder prices or promise a massive saving. No reliable figure exists for how much homeowners save.
What a quantity surveyor costs
Fee levels in 2023 were roughly 0.5 to 2 per cent of the project value, while older 2018 prices put it at around 2 per cent. The exact percentage varies significantly with the surveyor's experience, as well as the project type, complexity, size and scope. The RICS abolished its indicative fee scales, with the last being withdrawn in 2000, so you must always ask for a direct quote.
Sometimes a fixed fee for a specific piece of work is negotiated instead, for example if just a single report is required. Time-charge fees may suit work where only a small amount of input is required.
The table below shows typical published prices and fee structures for cost management services.
|
Service or fee type |
Typical published cost or percentage |
|---|---|
|
Estimator (2018 figures) |
Around £350 |
|
Early detailed cost plan (2018 figures) |
£500 to £1,000 |
|
Quantity surveyor fee (2023 figures) |
0.5 to 2 per cent of project value |
|
Example 2 per cent fee on a £300,000 build (2018 figure) |
£6,000 |
These figures are typical published prices for the stated years, and local quotes for your specific project will differ.
How to choose a quantity surveyor
When you hire a professional to manage your construction costs, you need to check their qualifications. Look for AssocRICS, MRICS or FRICS after a surveyor's name, and the words RICS Regulated for the firm. You should confirm both on the RICS Find a Surveyor service.
RICS regulated firms must have a complaints handling procedure, give consumers free access to an independent alternative dispute resolution provider, and hold professional indemnity insurance. Under the Consumer Rights Act 2015, any service you pay for must be carried out with reasonable care and skill.
Services arranged online or by phone normally carry a 14-day cooling-off period. However, if you ask for the work to start inside this cooling-off period, you must pay for what has been done. Always read the terms of engagement carefully so you know exactly what is included in the fee before you sign. This is an important step in how to choose a chartered surveyor for your project.
Use this short checklist when hiring:
- Ask for a fixed fee and the exact scope of work in writing before you commit.
- Check their RICS membership on the official RICS register.
- Ask for evidence of their experience with similar domestic work and self-builds.
- Confirm they have a complaints handling procedure and professional indemnity insurance.
Common questions
What does a quantity surveyor do?
They calculate and manage the costs of all aspects of a construction project. They produce cost plans from architectural drawings, write bills of quantities for builders to price against, and track your spending to keep the project on budget.
Can a quantity surveyor project manage a build?
Yes, they can negotiate with builders and project-manage for the client if hired to do so.
Do I need a quantity surveyor for a small extension?
There is no legal requirement to use one, and a small extension can usually be managed without professional cost tracking. For most self-builds and complex historic renovations, Grand Designs magazine says skipping the service would likely be a false economy.
How is a quantity surveyor paid?
They are often paid a percentage of the total contract cost, typically between half a per cent and two per cent. They can also charge a fixed fee for a specific piece of work, or use a time charge for smaller amounts of work.
Next steps for your project
Before you instruct a professional to cost your build, make sure you have the right documents ready.
- Finalise your architectural drawings so they can be priced accurately.
- Decide whether your project complexity requires an estimator or a full quantity surveyor.
- Request two or three quotes from regulated professionals.
- Read the terms of engagement to check what is included in the fee.
When you are ready to start planning your build, you can find a surveyor near you to discuss your project and request a quote.
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