Cost overruns are rarely a surprise. By the time a project reports a significant variance, the decisions that caused it were usually taken months earlier. The value of disciplined cost management lies in catching those decisions while they can still be influenced.
Seven causes account for the majority of overruns we encounter.
1. Optimistic early estimating
A budget set before the design is understood, using rates that suit the business case rather than the market, constrains a project for its entire life. Early estimates should carry explicit assumptions, exclusions and a stated confidence range. An estimate presented as a single number implies a precision that does not exist at concept stage.
2. Scope creep without change control
Individually minor additions rarely feel like a problem. Collectively, and without a register that prices each one at the point of instruction, they become the single largest source of final account dispute. Every change should be measured, priced and agreed before it is built.
3. Incomplete tender documentation
Ambiguity in a pricing document does not remove risk; it transfers it into the tender as a premium, or defers it into a claim. Contractors price what they can see. What they cannot see, they either qualify or recover later.
4. Contingency set by convention
A flat percentage applied because it is customary bears no relationship to the actual risk profile of the scheme. Contingency should be derived from a quantified risk register, so it can be defended, drawn down deliberately and released when the risk expires.
5. Late or absent cost reporting
A cost report that arrives six weeks after month end reports history. Its value is nil. Reporting must be timely enough that the client can still act, and must state the anticipated final cost rather than only what has been spent.
6. Poor contract administration
Notices missed, instructions issued verbally and records kept inconsistently do not cause cost directly — they remove the ability to resist it. When entitlement is contested, the party with the better contemporaneous record generally prevails.
7. Ignoring inflation and supply chain reality
Budgets prepared on today’s rates for a programme delivering in three years must carry an explicit escalation allowance, informed by lead times and material availability. In a market as active as the GCC, this is not a technicality.
The common thread
Every item above is a control failure rather than a pricing failure. Cost certainty is not achieved by estimating more accurately at the outset; it is achieved by managing continuously thereafter.
