Do Construction Costs Stand Up to Scrutiny?

A practical look at common issues found in construction estimates and cost plans

Construction costs are often presented as if they are fixed, inevitable, or simply the result of market conditions. Sometimes that is true. But very often, a cost plan, estimate, variation account, or reinstatement proposal needs closer examination before it can properly support a commercial decision.

Eye-level view of a construction site with workers and machinery

The key question is not simply: “Is this expensive?”

The better question is: “Does the cost stand up to scrutiny?”

That means looking beyond the headline figure and asking whether the scope, quantities, rates, assumptions, exclusions, provisional sums, contractor pricing, and supporting evidence all align. A cost may be high but justified. Equally, a cost may appear reasonable at first glance while still containing gaps, duplication, weak assumptions, or items that have not been properly tested.

One common issue is unclear scope definition. If the works have not been properly described, priced costs may include broad assumptions or allowances that are difficult to validate. This can lead to misunderstanding between parties about what is actually included. A contractor may price one interpretation while a funder, client, insurer, or building owner believes they are paying for something wider. That disconnect can create risk later.

Another issue is insufficient cost build-up. A lump sum can be appropriate in some circumstances, but where a figure is being relied upon for funding, settlement, procurement, or dispute avoidance, it needs enough detail to be meaningfully reviewed. Labour, materials, plant, preliminaries, overheads, profit, access requirements, specialist works, design risk and programme constraints may all influence the final cost. Without a clear basis, the number is difficult to challenge or defend.

There is also the issue of market testing. A single quotation may provide an indication of cost, but it does not necessarily establish value. Depending on the situation, costs may need to be benchmarked, compared, tendered, negotiated, or tested against recognised experience. The purpose is not to drive prices down unfairly. It is to establish whether the proposed cost is reasonable, proportionate, and properly aligned with the required outcome.

Construction costs also often contain risk allowances. Some are legitimate and necessary. Others become a convenient place for uncertainty to sit. Provisional sums, contingencies, undefined design items and broad exclusions should be understood before decisions are made. If risk is not visible, it cannot be managed. If it is visible but not explained, it may not be reliable.

In insurance, reinstatement, refurbishment and complex project environments, additional care is often needed. The cost of putting something back, upgrading it, complying with current standards, improving it, or dealing with pre-existing defects can become blurred. If those distinctions are not identified early, parties may end up arguing later about what should have been included, what was reasonably necessary, and who should pay.

Good cost scrutiny is not about being obstructive. It is about creating a clearer commercial record. It helps decision-makers understand what is being paid for, why it costs what it does, and whether the supporting evidence is strong enough.

A properly reviewed cost should be capable of answering three questions:

1. What exactly is included?

2. Why is it necessary?

3. Is the price reasonable for that scope, risk and context?

If those questions cannot be answered clearly, the cost may still be correct — but it is not yet properly evidenced.

At Steward & Keel, we look at construction costs with that commercial lens. The aim is not simply to accept or reject figures, but to test whether the cost, scope and evidence stand up to scrutiny before important decisions are made.