Construction mortgages: how progress advances actually get released.

Most construction mortgages release funds against a defined set of milestones rather than a fixed calendar — commonly foundation complete, framing and roof closed in, mechanical rough-ins and insulation done, drywall up, and substantial completion. The exact stages vary by lender and by project size, but the underlying logic follows the same valuation approach covered in appraisal requirements by lender type: the lender is only ever exposed to the value of work that's verifiably already in the ground.

This is also why a construction mortgage's total approved amount and the amount actually advanced at any given point are two very different numbers. A borrower and their lender may agree on a full construction budget up front, but the lender only ever releases what the current stage justifies — the gap between the two figures is, in effect, the lender's ongoing protection against a project that stalls or runs over budget partway through.

Before releasing an advance, the lender needs confirmation — typically from an inspection, or an architect's or engineer's certificate — that the work claimed for that stage is actually complete and worth what's about to be advanced against it. On CMHC-insured construction financing, the insurer offers a full-service option that validates a set number of advances directly, or a basic-service option where the lender validates the advances itself without CMHC pre-approving each one.

Missing or delayed inspection scheduling is one of the most common reasons a construction file's draw is late relative to the builder's own timeline, independent of anything wrong with the build itself.

The inspector or certifying professional isn't assessing whether the build looks good — they're confirming a dollar value of completed work against what the draw request is asking for, which is a narrower question than a full home inspection asks. A builder unfamiliar with that distinction sometimes assumes a passed inspection means a clean bill of health on the whole project, when it really only confirms the specific stage the lender is being asked to pay for.

On top of the lender's own draw structure, provincial construction or builders' lien legislation typically requires a statutory holdback withheld from each payment to contractors and subcontractors — 10% in Ontario under the Construction Act, deducted directly from the amount the lender advances. That holdback exists to protect unpaid subcontractors' lien rights, and a lender who fails to retain it properly can find lien claimants ranking ahead of the construction mortgage itself.

Ontario's Construction Act was amended effective January 1, 2026 to require that basic holdback be released annually rather than held until the very end of a project, which changes the cash-flow timing brokers need to walk builder-clients through. Holdback rules are provincial — a broker working outside Ontario needs to confirm the equivalent legislation in that province rather than assuming the same 10% figure or release schedule applies.

The broker's coordination job is keeping the inspection and draw timeline moving in step with the builder's own schedule, since a delayed draw can leave a builder short of cash mid-stage even when the underlying mortgage is perfectly sound. That coordination overlaps directly with how conditions vary by lender type, since construction lenders often attach inspection-specific conditions a standard purchase file never sees.

Brokers who route this coordination through Treadstone's fulfillment associates get each draw's inspection scheduled and tracked as its own mini-file, rather than left to catch up with the builder's pace after the fact.

Setting expectations with the borrower before the first draw is requested pays off later, since a client who doesn't understand the milestone structure sometimes assumes the full mortgage amount is available the day the deal closes. Walking through the draw schedule, the inspection requirement at each stage, and the holdback that gets deducted along the way — before the build starts, not partway through it — heads off a frustrated call the first time a draw comes in smaller than the client expected.