Take a 120-unit residential project with a contract value of BDT 180 crore, funded partly by borrowing, running on a 36-month programme. It finishes in 42 months instead. The delay looks like a scheduling problem. It is a financial event, and the cost falls in five places, most of which never appear as a line item labelled "delay".
The five costs
| Cost | How it arises | Order of magnitude on this project |
|---|---|---|
| Finance cost | Six more months of interest on outstanding project borrowing | Material — a direct function of the outstanding balance and rate |
| Cost escalation | Six more months of material and labour price movement on unspent work | A few percent of remaining construction cost |
| Fixed site overhead | Site office, supervision, security, equipment for six more months | Monthly site overhead × 6 |
| Delay compensation | Where the sale agreement provides for it | Per the agreement, across affected units |
| Collection slippage | Buyers who stop paying when the site stops moving | Often the largest and least anticipated |
The fifth is the one that surprises developers. A stalled site is visible to every buyer who drives past it, and the rational response of a buyer with a milestone-linked plan is to stop paying. That converts a construction problem into a cash problem, which slows construction further — the loop that turns a six-month delay into an eighteen-month one.
Why delays compound
Slippage is rarely recovered, because the causes are usually structural rather than one-off: a contractor stretched across too many sites, a material shortage that recurs, an approval that has to be renewed. A programme two weeks behind at foundation is normally more than two weeks behind at the roof. Treating early slippage as noise is the most expensive optimism available in development.
The three controls that actually help
Milestone certification on the day. Not a monthly summary. A milestone certified when it happens gives you a real progress line rather than a reconstructed one — see milestone billing.
A forecast cost to complete, updated monthly. Actual-to-date tells you where you have been. The forecast tells you whether the budget survives, and it requires judgement rather than a query. See project-wise profitability.
Proactive buyer communication. Dated construction photographs sent monthly, unprompted, and an early, honest revision of the handover date. The cost of this is near zero and it protects collection, which is the largest delay cost.
Modelling the delay before it happens
At the start of a project, run the cash flow twice: once on the programme, once on the programme plus six months. The difference is your delay exposure, and knowing it changes real decisions — how much contingency to hold, whether to accept a payment plan that pushes collection later, and whether the contractor's programme is credible at all. Developer cash flow covers how to build the model.
The reputational tail
The cost that does not appear in any model is the next project. In a market where buyers ask each other about developers, a project that handed over late produces a slower launch next time, higher advertising cost per booking and more discount pressure. Developers who deliver on time convert their record into a price premium; the effect is real and it is compounding in both directions.
What to do next
Take your current project and write the six-month-late version of the cash flow. If the largest number in it is collection slippage rather than interest, the highest-return delay mitigation available to you is not on the site — it is in how progress is certified and communicated.