Budget overruns in construction rarely come from one big mistake; they come from small deviations that build up unnoticed. Cost control is therefore not a sum done at the end, but a discipline that runs from day one to handover. The seven steps below form the basis of that discipline.
1. Define the scope in writing, item by item
The first condition of cost control is knowing exactly what will be built. ‘Building a villa’ is not a scope; ‘this much floor finish, in this material, to this detail’ is. Every item left vague returns later as a dispute over variations.
2. Build the budget on quantities
The estimate should be calculated from the quantities and unit rates of the work items, not from a single price per square metre. This item list is called the bill of quantities (BOQ). A budget based on quantities shows what each item costs and how a design change will affect the total. See our article on preparing a BOQ for details.
3. Set aside a contingency
No budget can know everything in advance: ground conditions, surprises behind the walls of an existing building, price changes. Set aside a separate contingency in the budget for these uncertainties, and record when and by which decision it is used.
4. Compare bids on the same scope
Putting the totals of different firms’ bids side by side is misleading, because each bid may rest on a different scope. Asking for bids against the same item list lets you compare the same work and exposes the missing items in a bid that looks ‘cheap’.
5. Tie payments to the work done
Payments should follow the quantity of work actually done on site, not the calendar. An interim payment means measuring the work done against the quantities and pricing it at the unit rates. This protects both owner and contractor: there is always a link between the money paid and the work done.
6. Manage changes in writing
Changes during construction are inevitable. What matters is that every change is approved in writing with its cost and time effect before it is carried out. Changes approved verbally are where cost control is most often lost.
7. Compare the budget with actual cost regularly
At regular intervals, ask three questions: What did the budget foresee? What has been spent so far? What will the total be when the work is finished? When this comparison is part of the progress report, deviations show up early and the owner can weigh the options before the problem grows. We describe this process on our progress monitoring and reporting page.
Common mistakes
- Fixing the budget ‘per square metre’ before the design is complete.
- Choosing the lowest total bid without examining its scope.
- Spending the contingency like normal budget.
- Pricing variations only after the work is finished.
DEMAFT’s approach
Every DEMAFT quote defines the scope item by item, with quantities and unit prices; the programme and payment plan are part of the quote. Itemised quotes, a written process and regular progress reports are the three parts of our transparency principle: we want our clients to know at every stage what they are paying for and where the work stands.
If you want budget and cost tracking on your behalf, see our cost management and BOQ service. If you are building a villa in Türkiye, you can get a first estimate with DEMAFT’s free tool villamaliyeti.com (in Turkish).
