It is worth naming plainly, for the sake of setting realistic client expectations: cost overruns on construction projects are common. Unexpected site conditions (rock, poor soil, unforeseen utilities), material price volatility, change orders the client requests mid-build, and permit or inspection delays all push budgets upward regularly, and a broker who frames construction financing as a fixed, predictable process is setting a client up for a difficult conversation later.
The useful skill is not avoiding overruns entirely — some are genuinely unforeseeable — but recognizing one early, through the cost-to-complete process covered in module 03, and knowing the realistic set of ways forward once one shows up.
When an overrun surfaces, the lender's underwriting response starts with the same cost-to-complete question as always, just under pressure: given what remains in the budget line items and what remains in the approved loan and borrower equity, is there still enough to finish? A small, contained overrun that the existing contingency absorbs may not require any formal change at all. A larger one forces a decision.
Broadly, a confirmed shortfall gets resolved one of a few ways. The borrower can inject additional equity to cover the gap, which is the most common and most lender-friendly resolution, since it restores the original risk position without changing the loan. The scope of the build can be reduced or value-engineered to bring the remaining cost back in line with remaining funds — cheaper finishes, a smaller square footage change, or deferring a feature to after closing. In some cases the lender may agree to increase the loan amount, but this is a fresh underwriting decision, not an automatic top-up — it reopens the file's loan-to-value and the borrower's qualification at the higher amount. And where none of these resolve the gap, the lender can pause further draws until the shortfall is addressed, which is the outcome everyone in the file is trying to avoid, since a stalled project with unpaid trades and lien exposure is the exact bad scenario the whole draw and holdback structure was built to prevent.
None of these are unusual or punitive by construction-lending standards — they are the ordinary mechanics of a business that plans for the fact that budgets move.
One overrun source deserves specific mention because clients consistently underestimate it: the interest cost on the drawn balance during the build itself. As covered in module 06, interest during a progress-advance construction loan accrues on the running drawn amount, which means any delay to the build — a stalled trade, a permitting holdup, a weather delay — extends the period over which that interest accrues, quietly adding to total project cost even if every line item in the actual construction budget comes in exactly as quoted. Building an explicit interest-during-construction contingency into the original budget, rather than treating it as a rounding error, prevents this from becoming its own small overrun.
A construction project is six weeks behind schedule but every trade has otherwise come in on their quoted price. Has the project experienced a cost overrun?
Trade pricing coming in on-budget is good news, but it is not the whole picture. A six-week delay extends the period over which interest accrues on the drawn construction balance, which is a genuine added cost the original budget's timeline assumed away. This is exactly the kind of overrun clients see least clearly, because it does not show up as a single line item going over — it shows up as the calendar stretching, quietly, underneath every other number.
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