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A quantity surveyor, or QS, is a construction professional who measures plans, prices the work, and manages costs on a build, usually charging a percentage of the project value or a day rate for their time. Assemble is software that lets builders and subcontractors do their own takeoffs and pricing directly, without handing the plans to a third party.

Every small contractor who has ever waited on a QS to get back to them with a number has asked the same question: do I actually need this step, or am I paying for a gatekeeper? This is not an argument that a QS is obsolete. It is a straight look at what each one is actually built to do, so you can work out which one your business needs, and when.

The core hook: cost and control

The real issue most builders and subcontractors have with the QS model was never the expertise. It is that pricing a job means handing your plans to someone else, waiting on their turnaround, and paying for it, on every single job, whether it is a straightforward extension or a full new build.

A typical QS engagement looks like this: send over the plans, wait for a cost plan or bill of quantities to come back, review it, go back and forth on anything that does not match your own sense of the job, then price your bid off their numbers. For full cost management on a residential project, that service typically runs 1.5% to 3% of the construction value, so a €250,000 build could mean €4,000 to €7,500 in QS fees. Smaller, one-off pieces of work are usually billed at a day rate, often somewhere in the €300 to €600 range depending on experience and location.

Assemble takes a different approach. You measure the plans yourself, on screen, and price the job using your own rates, reusable assemblies, and cost data, all inside a monthly subscription. There is no waiting on a third party's calendar, and no per-job fee on top of what you are already paying for the software.

That difference, a percentage of every job versus a flat monthly cost, is not just about money. It is the difference between a business that owns its numbers and one that is dependent on someone else's turnaround to get a bid out the door. And because a QS fee is typically incurred at bid stage, it applies to jobs you lose as well as jobs you win, so the real cost per signed contract is higher than the fee on any single job suggests.

Side-by-side breakdown

Cost

There is no getting around it: a QS is a percentage-based or day-rate cost that recurs on every job you use them for. Assemble is a flat subscription regardless of how many jobs you price in a month. For a contractor bidding regularly, the QS model means the more work you chase, the more you pay for pricing help. With Assemble, pricing more jobs costs the same as pricing one.

There is a second cost most contractors do not put a number on: you pay the QS to price a bid whether or not you win it. If you are winning one in three jobs you bid on, and that is a fairly typical hit rate, every won job is effectively carrying the QS cost of the two you lost as well. A day rate of a few hundred euro on a single job looks manageable. A day rate paid out on three bids to land one signed contract is a different number entirely, and it is one that scales with how competitively you are bidding, not with how much work you actually win. Pricing your own jobs removes that multiplier. A lost bid still costs you the time to measure and price it, but it does not cost you a fee on top.

Turnaround and control

A QS works to their own calendar, not yours. If a bid deadline is tight, or a client wants a number by Friday, you are at the mercy of someone else's workload. Doing your own takeoff and pricing means the bid goes out as fast as you can measure the plans, not as fast as someone else can fit you in.

Consistency and ownership

Every QS prices slightly differently, and that variation is hard to predict from job to job. When you price your own jobs using reusable assemblies, the same materials, labour, and costs get applied the same way every time, so your numbers get more consistent and more accurate the more jobs you run through them, not less.

Where a QS still earns their fee

None of this means a QS is pointless. On large or complex builds, multi-contractor projects, anything requiring a formal bill of quantities for a lender or client, or a genuine dispute over final accounts, an independent, chartered assessment carries a weight that in-house pricing simply cannot. A QS is also valuable when you are the one being quoted to, not the one doing the quoting, checking that a builder's price is fair before you commit to it.

When is a QS still worth it?

Not every job needs a third-party gatekeeper, and it is worth saying that plainly. A residential extension, a new-build home, or a subcontractor scope with a clear, well-understood set of drawings rarely needs an independent cost consultant to price it. If you know the trade and you know your rates, adding a QS into the loop mostly adds cost and turnaround time without adding accuracy.

A QS remains the right call on large commercial or multi-party contracts, anything with a formal tender process, or situations where an independent, professionally certified number is a contractual requirement rather than a preference. Bringing in a QS for a straightforward job you are fully capable of pricing yourself does not make the number more accurate, it just makes it slower and more expensive to get to.

The tipping point

So when does it make sense to price your own jobs instead of going through a QS? A simple rule of thumb: if you are a residential contractor or subcontractor who understands the scope of your own work, and you are bidding on jobs regularly enough that QS fees or turnaround delays are eating into your margin or your bid volume, it is worth pricing the job yourself.

Size of business matters less here than type of work. A solo subcontractor pricing a handful of jobs a month and a twenty-person building firm running several sites at once can both do their own takeoffs and pricing, as long as the work itself does not require the independent sign-off a formal QS engagement provides.

Frequently asked questions

Do I need a quantity surveyor for a residential extension or new build?

Not necessarily. For a straightforward residential job where you understand the scope and have your own rates, pricing it yourself with takeoff software is usually faster and cheaper than engaging a QS. A QS becomes more valuable on larger, more complex, or multi-party projects, or where an independent cost assessment is a formal requirement.

How much does a quantity surveyor cost compared to estimating software?

A QS typically charges 1.5% to 3% of the construction value for full cost management, or a day rate, often in the €300 to €600 range, for smaller pieces of work. Estimating software like Assemble runs on a flat monthly subscription regardless of how many jobs you price.

Can subcontractors price their own jobs without a QS?

Yes. Subcontractor scopes are usually well-defined enough that the subcontractor already understands the work better than a general QS would. Pricing it directly, using your own rates and reusable assemblies, is typically faster and keeps the margin in the job rather than paying it out as a fee.

Does a QS fee still make sense if I do not win the job?

A QS fee is typically incurred at bid stage, so it applies whether you win the job or not. If you are winning a fraction of the jobs you bid on, which is normal for most contractors, the fee on your losing bids still has to be absorbed somewhere, usually into the margin on the jobs you do win. Pricing your own jobs removes that added cost on bids that do not convert.

If you are not sure whether your jobs still need a QS or whether you can price them yourself, the fastest way to find out is to try pricing a real job both ways. Assemble is free for 14 days, no credit card required, so you can see exactly how it compares before committing to anything.

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Not sure what a bill of quantities actually contains, or whether your job needs one? Read our guide to what a bill of quantities is and when you need one.