The client
A self-build project in Halifax, financed with a construction (progress-draw) mortgage released across four milestones tied to inspected stages of the build, rather than a single lump advance at closing.
The build proceeded normally through the first two draws until an excavation crew hit bedrock at the foundation that the original soil survey had not flagged — the exact kind of mid-build surprise a progress-draw structure is built to absorb, up to a point.
Approved budget
$520,000, land plus build
80% loan-to-cost construction mortgage: $416,000
Draw schedule
15% / 30% / 30% / 25%
Foundation, framing, drywall, completion
Contingency
$26,000, built into the budget
5% of the approved total
Change order
$38,000 cost overrun
Unexpected bedrock excavation at the foundation
As-complete appraisal
$610,000
Confirmed on completion
Household income
$9,300/month combined
Property tax est. $460/mo post-completion; heat est. $150/mo
The problem
The $38,000 change order landed after Draw 2, once framing was already complete and the crew was ready to move to drywall and mechanical rough-in for Draw 3. The lender’s draw-holdback policy will not release the next advance beyond the originally approved budget without the shortfall being resolved first.
The overrun, against the contingency
- ▸Change-order cost overrun: $38,000
- ▸Contingency already built into the approved budget: $26,000
- ▸Shortfall beyond what the approved mortgage could cover: $12,000
This is the mechanic every progress-draw mortgage process needs to be explained clearly before ground ever breaks: a contingency absorbs a normal-sized surprise, but any overrun larger than the contingency becomes the borrower’s to fund before the next draw, not the lender’s to advance early.
The numbers
The $416,000 mortgage was structured at an 80% loan-to-cost ratio against the $520,000 approved budget, released across four milestone draws rather than as a single advance.
| The draw schedule and the shortfall | Amount |
|---|---|
| Draw 1 — foundation (15%) | $62,400 |
| Draw 2 — framing/lock-up (30%) | $124,800 |
| Draw 3 — drywall/mechanical (30%) | $124,800 |
| Draw 4 — completion (25%) | $104,000 |
| Total approved mortgage | $416,000 |
After Draws 1 and 2, $187,200 had been advanced against the build. The interest-only carrying cost on that drawn balance, at an illustrative 6.49% construction rate, ran to $1,012 a month while the shortfall was being resolved — the real, ongoing cost of a held draw.
On completion: converting to an amortizing mortgage
| Rate & payments | Figure |
|---|---|
| Contract rate at conversion — 5-year fixed (illustrative, not a quote) | 5.29% |
| Minimum qualifying rate — greater of contract + 2% and 5.25% | 7.29% |
| Monthly P&I at the qualifying rate — the ratios run on this | $2,989 |
| Monthly P&I at the contract rate — what they actually pay | $2,489 |
The as-complete appraisal came in at $610,000 against the $416,000 mortgage, a 68.2% final loan-to-value. GDS and TDS both land at 38.7% on $9,300 a month in household income — comfortably under CMHC’s insured ceiling, though this converted mortgage is uninsured given the completed LTV.
The solution
A Nova Scotia mortgage broker confirmed the lender’s draw-holdback policy in writing before the first advance ever released, so the change order was a cash-timing problem with a known solution, not a surprise threatening the whole build.
First, got the shortfall confirmed in writing immediately. Once the bedrock excavation cost was quoted, the broker had the builder itemize exactly how much of the $38,000 was covered by the $26,000 contingency and how much was not.
Second, arranged the borrowers’ $12,000 top-up ahead of the Draw 3 inspection, rather than after the holdback notice arrived, so the drywall and mechanical work was not delayed waiting on financing.
Third, kept the mortgage broker of record in the loop with the builder throughout, so the next milestone inspection and draw request went in on schedule once the top-up cleared.
The outcome
Draw 3 released once the $12,000 shortfall was confirmed and injected, the build finished on the remaining budget, and the loan converted to a standard amortizing mortgage on completion. Nova Scotia’s housing starts activity includes a meaningful share of self-build progress-draw files exactly like this one, where the draw structure, not the mortgage rate, is what decides whether a mid-build surprise sinks the project.
What to take from this file
- 01A budget contingency absorbs a normal surprise, not an unlimited one. Once an overrun exceeds the contingency, the shortfall is the borrower’s to fund before the next draw releases, not the lender’s to advance early.
- 02Confirm the lender’s draw-holdback policy before the first advance, not after a change order arrives. Knowing the rule in advance turns a crisis into a known, plannable step.
- 03A held draw has a real ongoing cost. Interest-only carrying costs continue accruing on the amount already drawn while a shortfall is being resolved.
- 04Get the shortfall confirmed in writing immediately, and arrange the top-up before the next milestone inspection, not after the holdback notice, to avoid delaying the build itself.
- 05The conversion to an amortizing mortgage on completion is qualified at the qualifying rate, not the construction contract rate. This file qualifies at 7.29% and pays at 5.29%.
Sources
Every regulatory figure in this file traces to one of these primary sources. Client details and anything that varies by lender are illustrative, as flagged below.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸CMHC — CMHC Reviews Underwriting Criteria — GDS 39% / TDS 44% maximums and the 600 credit-score floor for insured files.
- ▸Provincial/territorial mortgage-broker legislation fetched directly (bclaws.gov.bc.ca, legisquebec.gouv.qc.ca, fcaa.gov.sk.ca, web2.gov.mb.ca, nslegislature.ca, assembly.nl.ca) plus FCNB's own site for NB and CanLII's index for PE — see notes for per-province method — provincial mortgage regulators and licence titles.
Illustrative in this file — lender-specific, not rules:
- ▸80% loan-to-cost construction ceiling — construction-loan ceilings are lender policy, not a statute.
- ▸4-draw milestone schedule and 5% contingency — draw structure and contingency size vary by lender and builder.
- ▸6.49% construction interest-only rate and 5.29% conversion contract rate — rates move daily; not quotes.
Authority & provenance
How this case file was built
We publish the origin, the verification method and the reviewer for every case file, so you can judge how far to trust it before you rely on it with a client.
Where it comes from
Derived from files handled by Treadstone’s fulfillment desk and from scenarios contributed by partner brokerages. Names, employers, exact amounts and dates are changed so no client or file is identifiable.
Provenance: Composite — a pattern seen repeatedly on fulfilled files, not a single transaction.
What is verified
Every regulatory figure traces to a primary source listed above and was checked against it on the date shown. The arithmetic is recomputed by machine on every rebuild.
Anything that varies by lender is labelled illustrative rather than stated as a rule.
Who reviewed it
Reviewed for Canadian regulatory accuracy before publication, and re-checked whenever a cited rule changes.
Reviewed by: Nicholas Parson, Treadstone Associates — reviews every case file before publication.
This case file is professional reference material for licensed mortgage professionals. It is not advice to a borrower, and it is not a lender commitment. Insurer rules, qualifying rates and provincial taxes change — confirm the current position with the insurer, regulator or lender before you rely on any figure here in a live file.