The change order that outran the draw schedule

A structural change order — a foundation revision driven by soil conditions found once excavation began — added $34,000 to a budget that had already been fully allocated across the approved draw schedule. The remaining approved draws did not cover it, and the lender will not release the final draw against an incomplete home, so the shortfall had to be resolved before completion could even be inspected.

The mechanics of a construction holdback are set by each lender and by provincial lien legislation, and they vary; what does not vary on a well-structured file is the loan-to-cost discipline the lender applied when the file was first approved. The fix that keeps a lender comfortable is one that preserves that same ratio on the increase, not one that quietly shifts more risk onto the mortgage.

Soil-driven foundation changes are one of the more common sources of a mid-build overrun precisely because they surface only once excavation is underway — a pre-construction geotechnical report reduces the risk but rarely eliminates it entirely, and the budget approved at the outset is built on the engineer's best estimate rather than a guarantee. A broker who has not planned for the possibility of an overrun on a self-build file is planning for the exception rather than the norm.

First, the overrun itself, and how it is split. Holding the original 90% loan-to-cost ratio on the additional $34,000 means the lender and the buyer share the increase in the same proportion as the original approval.

New total budget: $420,000 + $34,000 = $454,000. New construction mortgage before the insurance premium: $378,000 + $30,600 = $408,600. New total buyer equity: $42,000 + $3,400 = $45,400. $408,600 ÷ $454,000 confirms the ratio held exactly at 90% loan-to-cost.

Re-running the insured structure on completion

Minimum qualifying rate is 7.39% against a 5.39% contract rate on the completed mortgage (illustrative, not a quote). Monthly P&I at the qualifying rate is $3,053; at the contract rate, $2,544.

A New Brunswick mortgage broker went to the lender with the split already calculated, rather than simply forwarding the change order and asking what happens next. Proposing the 90/10 split up front — matching the loan-to-cost ratio the lender had already underwritten — gave the lender a request that mirrored its own risk policy instead of one that shifted more of the increase onto the mortgage.

Ordered a revised as-complete appraisal before requesting the top-up, confirming the finished home would support the higher total loan under the same loan-to-value logic the original approval used.

Re-ran the full insured structure on the increased amount, not just the dollar increase in isolation — the premium band, the qualifying-rate payment and both ratios all needed to be confirmed against the new $421,267 total, not assumed to still work from the original approval.

Sequenced the buyer’s additional equity ahead of the lender’s top-up, so the funds were in place and confirmed before the request reached underwriting — removing the one variable most likely to stall a change-order file.

Documented the change order itself, not just its cost — the structural engineer's letter explaining the soil condition and the contractor's revised invoice went into the submission alongside the financial figures, so the lender could see the overrun was a documented, one-time event rather than a sign of budget mismanagement.

Confirmed the remaining draw schedule still made sense after the increase, since a top-up mid-build can shift the dollar amount attached to a later draw even when the number of draws and their triggering inspections stay the same.

The lender approved the $30,600 top-up on the original 90/10 basis, the buyer’s $3,400 additional equity was confirmed on deposit, and the final draw released once the completed inspection cleared. GDS landed at 37.4% and TDS at 40.6% on the increased, insured mortgage — both inside the caps.

New Brunswick’s flat 1% real property transfer tax applies to a purchase of land, not to a construction-mortgage top-up on land the buyer already owns, so no transfer-tax figure applies to this file; any land-purchase transfer tax would already have been paid at the start of the build, before this change order arose. Mid-build cost overruns like this one are a routine feature of the volume behind Canadian housing starts statistics — every self-build financed this way carries some risk of a change order before the final draw.

The household’s equity position also ended slightly stronger, in relative terms, than the original file: because the top-up preserved the same 90% ratio rather than letting it drift higher, the buyer’s proportional stake in the finished home is identical to what it was the day the original construction mortgage was approved, despite the home itself costing more to complete than anyone budgeted for at the outset.

• 01Hold the original loan-to-cost ratio on any mid-build overrun. A lender that approved a 90/10 split will read a request to keep that same split as low-risk, not as a new ask.
• 02Sequence the buyer’s equity ahead of the lender’s top-up. Confirmed funds on deposit remove the slowest variable in a change-order approval.
• 03Order a revised as-complete appraisal before requesting the increase, not after — the lender needs to see the finished value supports the higher total.
• 04Re-run the entire insured structure on the new total, not just the incremental dollar amount — the premium band and both ratios can shift even on a proportionally small increase.
• 05Holdback and lien-registration mechanics vary by lender and by provincial legislation. Confirm the specific lender’s current policy rather than assuming a figure from a different file or province.