Construction Contract Terms That Every Customer Should Question
A good contract protects both parties and lets everyone get on with delivering the project. A bad one becomes the reference point for every disagreement.
This is the third and final supporting piece in our design and costing series. The pillar, From Brief to Budget, set out how the decisions made long before anyone reaches site shape everything that follows. Routes to Pricing looked at how the procurement route you choose allocates risk between you and your contractor. How Contractor Pricing Really Works explained what actually sits inside the number you’re given, and how much of it you influence. This piece deals with the document that holds all of it together.
It’s written for organisations entering construction or capital projects contracts without dedicated legal or commercial resource in-house. The construction contract terms that cause the most difficulty rarely sit in the headline price. They sit in the schedules and appendices, which is exactly why they get less scrutiny than they deserve. This won’t replace professional advice, but it will help you know what to look for, and when to ask for it. It’s also worth knowing there are independent national standard forms of contract to consider, notably those published by the Joint Contracts Tribunal (JCT) and New Engineering Contract (NEC), a suite of standard-form contracts endorsed by the Institution of Civil Engineers (ICE).
Construction contract terms worth questioning
One-sided risk allocation
The most common pitfall is a contract that passes all risk to the contractor, including risks they can neither control nor reasonably price. It feels like protection, but it isn’t. Risk that can’t be managed gets priced as a contingency, or surfaces later as an expensive claim. Fair risk allocation puts each risk with the party best placed to manage it.
Payment and retention terms
This is a low margin sector, so unreasonable payment periods, overly complicated certification processes and aggressive retention practices strain the relationship and the supply chain. A contractor worried about cash flow is not a contractor focused wholly on your project. Reasonable, prompt payment terms are in your interest, not just theirs.
Limits of liability
Liability clauses are easy to skim and expensive to get wrong. Watch for caps and exclusions drafted to disadvantage the customer. This is precisely the kind of clause where independent advice pays for itself. Equally, if you’ve chosen a contract make sure, you’re not placing unreasonable, unmanageable or uninsurable risk on your contractor.
Bespoke amendments to standard forms
Heavily amended standard contracts are where balance quietly shifts. Each amendment may look reasonable in isolation; cumulatively they can move the risk profile a long way from the fair starting point the standard form was designed to provide. Ask why each amendment exists, and whose interest it serves; if nobody can give a straight answer, that is itself a warning sign. Understanding how contractors price risk helps explain why some amendments get pushed back on hard, and others get quietly absorbed into the price.
Variation and change control
Few projects run exactly to the original scope because things can legitimately change, so the process for agreeing and pricing a change matter as much as the price agreed at the outset. Vague variation clauses, or ones that let a contractor value change unilaterally, are a common source of budget creep. Look for a clear notification process, an agreed basis for pricing, and a timescale for both sides to respond. The procurement route you choose also shapes how variations get valued and agreed, so it’s worth revisiting alongside your pricing strategy.
Dispute resolution and termination
Every contract should set out how disagreements get resolved before they escalate, ideally through structured negotiation and adjudication rather than jumping straight to litigation. Check the termination provisions too: on what grounds can either party end the contract, what notice is required, and what happens to work in progress and retained monies if it ends early. These clauses rarely get attention until they are needed, by which point it is too late to renegotiate them.
Insurance and indemnities
Insurance and indemnity clauses are where risk allocation becomes concrete: they decide who actually pays when something goes wrong. Check that cover levels are proportionate to the project, that indemnities are mutual rather than one-way, and that requirements are realistic and proportional for the size of contractor and project involved. Disproportionate indemnity demands can price smaller, capable contractors out of a tender before it even begins.
Why standard forms matter
Standard forms also mean the construction contract terms you’re agreeing to carry the weight of established case law and shared understanding across the industry. Everyone knows where they stand, which reduces both the likelihood and the cost of disputes. Where amendments are genuinely necessary, for example to reflect a live operational environment or a specific procurement route, they should be targeted, clearly drafted, and shared with the contractor early enough for it to be priced properly, not introduced late in negotiation when neither side has time to think them through.
IN OUR EXPERIENCE
Our firm view, from many projects, is that standard form contracts work best when they remain as unamended as possible. A recognised standard form, NEC or JCT, is independently constructed by industry professionals, and is fair and unambiguous for both parties. The disputes we see almost always arise from amendments that are either inequitable or simply unfair. An unamended standard form removes a whole category of argument before it can start.
Fair terms are easier to agree when both parties already understand the building. Our work at UCL, upgrading 18 Biological Science Units in a live research environment shows what that continuity makes possible.
Getting your construction contract terms right starts before you sign
The cheapest time to fix a contract problem is before signature. The most expensive is during a dispute. If you don’t have legal and commercial resource in-house, bring it in early, ideally before the contract is issued for signature rather than once it has already been through several rounds of negotiation. A short review against the points above, risk allocation, payment and retention, liability, amendments, variations, dispute resolution, and insurance, will surface most of the issues that matter. The cost is modest against the value of the project and the cost of getting it wrong.
We work with customers on fair, transparent construction contract terms from the outset. See how we approach capital projects, or talk to our team.
