Subcontract tender analysis when bidders buy work

The cheapest subcontract return on your tender analysis this winter needs more scrutiny than usual, not less. Mace Consult's latest UK Market View says it plainly: "The most competitive tender may not be the best one and could come about from firms with a lack of work trying to buy jobs." When order books are thin, a low number can be a sign of hunger rather than efficiency, and the main contractor or developer who places the package on price alone is often the one who pays for the gap later.

Good subcontract tender analysis is how you tell the difference. That means levelling every return to the same scope and the same drawing revision, then testing whether the low bidder can actually deliver at that price.

What the market reports are saying

Mace Consult published its Q3 2026 UK Market View on 22 October, covered by both Building and Construction News. The headline numbers are grim. Output fell 1% in the three months to August and is 1.6% below a year ago. New orders fell 11.8% in Q2, the third consecutive quarterly decline. Construction material price inflation reached 6.4% in August, its highest level since March 2023.

Mace said there was a "strong argument" for cutting its tender price forecasts given that weakness, but held them at 3.5% for national real estate, 4.5% for national infrastructure and 3.5% for London. Its reasoning matters for anyone running a procurement schedule. Contractors will need to be more competitive to win work, which means "continued pressure throughout the supply chain", while spiking energy prices put a limit on how much material inflation firms can absorb. Ceri Evans, Mace Consult's global director of cost and commercial management, called for supply chain due diligence and early commercial engagement alongside realistic programmes.

The same report points to delivery setbacks on public programmes, including the additional prison places programme being delayed after a contractor entered administration. Mace's own conclusion is that this "highlights the importance of due diligence across the supply chain".

McBains, in forecasts reported by Construction Enquirer on 22 October, made a similar point from the other direction. Director Colin McCaffrey said competitive tendering is helping to constrain price growth, but steel is one of the biggest near-term cost risks and "a delay in procurement can have a direct impact on the bottom line."

Put those together and you get the commercial picture for most main contractors and developers right now. Subcontractors are pricing keenly to keep their teams busy while their own input costs are still moving, and your client still wants certainty. The return that looks like a saving on Monday can become a claim, a qualification fight or a replacement package by spring.

Why low returns go wrong

In my experience a low subcontract price usually fails for one of a handful of reasons, and almost none of them are visible on the summary sheet.

The bidder priced a different revision. If the tender went out with revision C of the structural drawings and revision D landed halfway through the tender period, one firm might have priced each. The cheapest number is often the one that missed the change.

The scope has been quietly trimmed. Exclusions sit in a covering letter, a qualification buried on page four, or a line in the preliminaries that says "by others". Attendances, temporary works, design responsibility and testing are the usual places to look.

The rates are fine but the programme is not. A firm that has priced 12 weeks of labour for a 16 week sequence will either come back for prolongation or pull its gang off site when it gets busier work elsewhere.

The business cannot carry the job. A package worth a large share of a subcontractor's turnover, on long payment terms with retention, puts real strain on their cash. That is a due diligence question, not a pricing one, and it is exactly what Mace is pointing at.

None of this means you ignore the low bidder. It means the low bidder has to earn the order by surviving the levelling exercise.

Worked example: levelling a cladding package

The figures below are illustrative, not from any real project. Say you have three returns on a rainscreen cladding package.

The three returns compare like this:

• Bidder A: £1,240,000, priced on Rev C, excludes mast climbers and access, excludes slab edge fire stopping, 14 week programme.

• Bidder B: £1,310,000, priced on Rev D, includes access and slab edge fire stopping, 18 week programme.

• Bidder C: £1,355,000, priced on Rev D, includes access and slab edge fire stopping, 18 week programme.

On the face of it Bidder A is £70,000 cheaper than B. Now add back illustrative allowances of £45,000 for access, £20,000 for slab edge fire stopping and £15,000 for the Rev D changes priced at B's rates, plus £40,000 for four weeks of extra preliminaries if A's programme proves short. A's levelled figure becomes £1,360,000, which is £50,000 above B. More to the point, you now have a set of clarifications to send A before anyone talks about placing an order. If A confirms the Rev D scope and the inclusions at the same price, good. If it cannot, you have your answer.

The value of the exercise is less about the final ranking and more about the paper trail. When your commercial director or the client asks why you did not go with the lowest number, you can show the levelled comparison and the clarification responses.

A checklist before you recommend the low bid

• Confirm every bidder priced the same drawing revisions, and reissue anything that changed during the tender period to all of them.

• Pull every exclusion and qualification into one schedule, then price each one so the comparison is like for like.

• Compare the bidder's programme to your master programme, package by package, and ask about any gap.

• Check the turnover dependency: the size of the package against the firm's latest filed accounts.

• Confirm insurance is current for the full package duration, not just today.

• Ask for recent references on similar packages, and call them.

• Record all tender queries and answers in one place, issued to all bidders, so nobody can later claim they priced on a different understanding.

• Write a short recommendation note that explains the choice, including why the lowest return was or was not taken.

Where the process usually breaks

Most of the failures above come from information control rather than bad judgement. Drawings go out by email, revisions follow in a separate email, tender queries are answered to one bidder by phone, and returns arrive as PDFs in five different formats. By the time someone builds the comparison spreadsheet, nobody is certain who priced what.

This is where SubTrada sits. Tenders are issued with the drawings pulled straight from the project's document register, so every bidder is pricing the current revision, and RFIs and pricing come back in the platform rather than through inboxes. Returns land in the tender tracker side by side, and the subcontractor profiles carry PQQ status and live insurance expiry, so the due diligence questions are answered next to the price instead of in a separate folder.

FAQs

What is subcontract tender analysis?

It is the process of levelling subcontract returns to a common scope, drawing revision and programme so they can be compared fairly, then assessing each bidder's ability to deliver. The output is a recommendation that explains which return represents best value, not only lowest price.

How do I spot a subcontractor trying to buy a job?

Look for a price well below the other returns with a long list of exclusions, a short programme, or a revision mismatch. A large package relative to the firm's turnover is another warning sign. Mace Consult's Q3 2026 report specifically flagged that the most competitive tender may come from firms short of work.

Should I always reject the lowest tender?

No. A low price can be genuine, for example from a firm with spare capacity close to site. The point is that the low bidder should go through the same clarification and due diligence as everyone else before you recommend it.

How long should the levelling exercise take?

Long enough to issue clarifications and get written answers back. If the procurement programme does not allow time for that, the programme is the problem. As McBains noted, procurement delays cost money, so build the analysis window into the schedule from the start.

The next step

Pick your next package due for return and set the levelling template up before the tenders come back, with the exclusions schedule, revision check and programme comparison ready to fill in. In this market I would rather spend two extra days testing a cheap number than two months recovering from it.