The client
A retired couple building on a lot they already owned outside Carleton Place, acting as owner-builders with one fixed-price general contractor for the shell -- framing, roof, windows and doors -- while lining up finishing trades themselves. Their construction mortgage funded in draws tied to the lender's own inspection cycle, roughly every five to six weeks.
Land
Owned outright, no existing charge
Contributed as equity toward the build
Build contract
$460,000 fixed-price shell-and-finish
Appraised value on completion
$700,000
Mortgage
$627,879 insured, 87% LTV
General contractor
Single fixed-price contract for the shell
The problem
Six weeks into framing, the general contractor finished the roof and issued an invoice for $84,000 -- itemized, dated, naming the amount claimed for work actually done. That is not just a bookkeeping entry; under Ontario's Construction Act it is a proper invoice, and a proper invoice starts a clock the owner does not control.
What Part I.1 actually requires -- not the holdback Part
- ▸§6.1 defines a proper invoice: the contractor's information, a description of the work, the amount claimed, the payment terms and the period covered
- ▸§6.4(1) — the owner must pay a proper invoice in full within 28 days of receiving it
- ▸§6.4(2) — the owner's only way to withhold payment is a Notice of Non-Payment served within 14 days, disputing all or part of the claim, with adjudication available if the parties disagree
- ▸None of this is the statutory lien holdback under a different Part of the same Act, which is a percentage retained until the job ends — prompt payment is an interim clock that runs on every proper invoice, mid-build
The couple had no dispute with the invoice -- the roof was done, the price matched the contract. Their problem was timing: the lender's draw inspection schedule ran on a fixed cadence, and the next one was booked for day 33 -- five days past the Act's 28-day deadline. The statute does not pause for a lender's calendar.
The numbers
This is a conventional insured construction-to-permanent mortgage; the Act's payment clock and the lender's draw calendar are two schedules that don't run in sync. The math below is about bridging that five-day gap, not about qualifying ratios.
| The build | Amount |
|---|---|
| Appraised value on completion | $700,000 |
| Down payment (13%) | $91,000 |
| Base mortgage before premium | $609,000 |
| CMHC premium (87% LTV, 3.10% band) | $18,879 |
| Insured mortgage | $627,879 |
The two clocks
| Whose clock, what it required | Timing |
|---|---|
| Proper invoice received | Day 0 |
| Statutory payment deadline (§6.4(1)) | Day 28 |
| Lender's next booked draw inspection | Day 33 |
| Gap the owner had to bridge | 5 days on $84,000 |
| Ratios on the take-out | Figure |
|---|---|
| Minimum qualifying rate — greater of contract + 2% and 5.25% | 7.44% |
| Monthly payment at the qualifying rate | $4,570 |
| Monthly payment at the 5.44% contract rate | $3,811 |
| GDS (qualifying payment + $410 tax + $150 heat) ÷ income | 38.0% |
| TDS (housing + $340 vehicle loan) ÷ income | 40.5% |
What a Notice of Non-Payment would have cost them
Serving a Notice of Non-Payment under §6.4(2) is built for a genuine dispute over the work or the amount, not a financing-timing mismatch. Using it to buy five days against an invoice they agreed was correct would have put a formal non-payment dispute, and a live adjudication right, on a contractor relationship they still needed for the rest of the build.
The solution
A broker experienced with owner-builder files treated the Act's 28-day clock as fixed and worked the lender's calendar around it, rather than the other way around.
The lender's own inspection cadence exists to protect its security, not to override a federal or provincial payment statute -- once that was explained, moving one inspection up by three weeks was a scheduling favour, not an exception to underwriting policy.
The outcome
The lender agreed to an unscheduled inspection two days after the invoice arrived, releasing the matching draw on day 26 -- two days ahead of the statutory deadline, and the five-day bridge was never actually needed once the earlier inspection was confirmed.
The 5.44% contract rate and $410/$150 tax and heat figures are illustrative deal inputs for this file, not quotes or published averages.
What to take from this file
- 01Ontario's Construction Act runs two separate clocks on the same build. The prompt-payment clock under Part I.1 (§6.4) is not the lien holdback every self-build budget already accounts for -- confusing the two leaves a file unprepared for the one that actually moves fastest.
- 02A proper invoice starts the 28-day clock the moment it's received, regardless of whether the lender's own draw inspection is scheduled to keep pace with it.
- 03A Notice of Non-Payment is a dispute tool, not a scheduling tool. Serving one against an invoice the owner doesn't actually contest trades a financing timing problem for a formal payment dispute and a live adjudication right.
- 04Ask the lender to move an inspection before assuming a bridge is needed. An unscheduled draw inspection costs the lender far less than it costs the file to explain a missed statutory deadline.
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 — Purchase (Mortgage Loan Insurance) — default-insurance premium schedule by LTV band (25-year amortization).
- ▸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:
- ▸5.44% contract rate — rates move daily; not a quote.
- ▸$410 property tax / $150 heat / $340 vehicle loan — illustrative carrying costs for this file.
- ▸5-day private bridge on $84,000 — a contingency the file priced but ultimately didn't use.
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.