The client
A buyer in Wasaga Beach had a $520,000 new-construction purchase insured-approved at 10% down against the builder's original base price and plans.
Original committed price
$520,000, Wasaga Beach
10% down, insured commitment approved against this price and plans
Mid-build change orders
$38,000
Kitchen upgrades and structural changes selected after commitment
Final purchase price
$558,000
Original price plus upgrades
Combined income
$10,200/month
The problem
An insured mortgage commitment on a new-construction purchase is approved against the specific plans and price presented at the time of commitment -- not against whatever the buyer eventually decides to add.
What the change orders could not do
- ▸The insurer's approved commitment amount was fixed to the $520,000 base price at the time of approval
- ▸$38,000 in mid-build upgrades raised the final purchase price to $558,000, but did not, and could not, raise the insured commitment along with it
- ▸No insurer administratively allows an open-ended increase to an already-approved insured file, however routine the upgrade
The buyer had priced the upgrades as though they would simply be added to the mortgage. The insurer's own commitment was never going to move.
The numbers
Keeping the insured mortgage itself tied to the original commitment, and funding the upgrades separately, is what actually closed the file.
| The insured mortgage, locked to the original commitment | Amount |
|---|---|
| Base mortgage (90% of the original $520,000 price) | $468,000 |
| Default-insurance premium (3.10% at 90% LTV) | +$14,508 |
| Total insured mortgage | $482,508 |
| Cash required at closing | Figure |
|---|---|
| Down payment (10% of $520,000) | $52,000 |
| Mid-build upgrades (funded separately, not insured) | $38,000 |
| Total cash required at closing | $90,000 |
At a qualifying payment of $3,365/mo, total debt service on the insured mortgage alone comes to 40.3% -- comfortably inside CMHC's 44% cap, consistent with the qualifying room new-construction financing typically needs to leave. Ontario land transfer tax, calculated on the full $558,000 price actually paid, came to $7,635 -- payable regardless of how the purchase was financed.
The solution
A mortgage agent licensed under Ontario's Mortgage Brokerages, Lenders and Administrators Act treated the change orders as a separate cash requirement from the outset, rather than assuming they would simply ride along with the insured takeout.
First, confirmed with the insurer that the approved commitment amount would not be revisited upward for the mid-build upgrades. The $520,000 basis was fixed at approval.
Second, had the buyer fund the $38,000 in upgrades directly at closing, rather than discovering at the takeout that the insured mortgage could not simply absorb the increase.
Third, confirmed Ontario land transfer tax with the lawyer against the full $558,000 price actually paid, since transfer tax is owed on the real consideration regardless of the insured mortgage's own, smaller basis.
The outcome
The purchase funded insured at 40.3% total debt service on the original committed amount, with the $38,000 in upgrades paid in cash and Ontario land transfer tax of $7,635 owed on the full $558,000 price.
40.3% sits comfortably inside CMHC's 44% TDS maximum; the ratio was never the constraint on this file -- the insured commitment's fixed basis was.
What to take from this file
- 01An insured new-construction commitment is locked to the plans and price approved at the time of commitment. Mid-build upgrades do not, and cannot, raise that amount automatically.
- 02Set expectations about change orders before the buyer selects them, not at the takeout. Cash needed for upgrades is a separate requirement from the insured mortgage itself.
- 03Land transfer tax is owed on the real, final purchase price, upgrades included -- independent of what the insured mortgage's own basis happens to be.
- 04A buyer who understands the commitment is fixed can plan cash flow for upgrades from day one. Discovering the ceiling at closing is what actually causes a scramble, not the ceiling itself.
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.
- ▸CMHC — Purchase (Mortgage Loan Insurance) — default-insurance premium schedule by LTV band (25-year amortization).
- ▸CMHC — CMHC Home Start — minimum down payment tiers (5%/10%) and the $1.5M insured price cap.
- ▸OSFI — Minimum qualifying rate for uninsured mortgages — the minimum qualifying rate — greater of contract rate + 2% or 5.25%.
- ▸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.
- ▸Ontario.ca — Calculating Land Transfer Tax / Land Transfer Tax Refunds for First-Time Homebuyers — Ontario's marginal land transfer tax brackets and first-time-buyer refund.
Illustrative in this file — lender-specific, not rules:
- ▸4.95% contract rate — rates move daily; not a quote.
- ▸the 40.3% total-debt-service figure — shown against CMHC ratio maximums for reference; each lender still applies its own overall credit-adjudication policy.
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.