1. Why the budget does not end when the contract is signed
Three reasons, and the third is the most painful for a client. It concerns the price of variations.
A construction project changes, because some things only become clear during the works, and changes cost money, so their price is added to the original total. Without tracking, the final total only becomes clear at the end, when nothing can be altered.
From this follows the starting point of the whole article: a budget overrun is not an event that happens at the end. It accumulates throughout construction and is discovered at the end.
2. What to track
Four things of different character, and only one of them is a management tool. The rest are reports after the fact.
| What to track | Character |
|---|---|
| The agreed contract sum | the starting point |
| Approved variations | added or deducted |
| Work carried out | progress line by line |
| The forecast final sum | calculable from the three above |
The first three describe the past, the fourth says where things are heading. Only the fourth looks forward, which is why only it makes a decision possible.
3. Three moments at which a problem is discovered
The difference between them is critical for a client, and it is not financial. It lies in timing.
| When it is discovered | What can still be chosen |
|---|---|
| When the variation is being planned | whether to do it at all |
| When the variation is being carried out | only how to proceed |
| When the invoice arrives | nothing |
The third moment is the most common and the worst. What separates the three is not the amount of money but the choice still available, and from that follows the real purpose of tracking: not reducing cost but making a decision possible in time.
4. What makes tracking possible
Three conditions must be met before construction, not during it. Afterwards they can no longer be created.
A structured budget whose lines have been agreed. Unit prices, which allow a variation to be priced without negotiation. And an agreement on how variations are documented and approved.
All three are decided before the contract, as covered by the article on requiring a structured tender. Without them, tracking is possible only at the level of the total sum, which discovers the problem too late.
5. Who tracks
Three possibilities, and confusing the first two is a common mistake. They measure different things.
| Who | What they track |
|---|---|
| The contractor | its own costs, which it tracks anyway for the sake of its profit |
| The client | its own outgoings |
| An independent supervisor or construction manager | both, where such a role is provided for |
The first and the second are not the same thing: the contractor tracks its margin, the client its budget. The contractor's cost control gives the client no information, since it concerns the company's internal economy. A client tracks what it pays, not what the contractor spends.
Summary and four practical rules
A budget that is not tracked is a forecast, because an overrun accumulates throughout construction and is discovered at the end. Four things must be tracked, of which only the forecast final sum looks forward and is therefore a management tool. What separates the three moments of discovery is not the amount of money but the choice still available, so the purpose of tracking is to make a decision possible in time.
Four rules: calculate the forecast final sum, not only the amount spent. Decide the structure, the unit prices and the variation procedure before the contract. Track approved variations, not invoices received. Distinguish the contractor's cost control from tracking your own budget, since they answer different questions.
This article offers professional orientation as at the date of verification. It replaces neither a quotation nor the assessment of a competent specialist.