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Construction Insurance Cost Calculator Ontario (2026): What Builder Risk Insurance Should Cost for Your Build, and the Quote Request Sheet to Send Your Broker
Construction InsuranceFree Calculator
What Should Insuring Your Build Cost? Work It Out Before the Broker Calls Back.
Builder’s risk, also called course-of-construction insurance, priced the way underwriters price it: a rate on the hard cost, moved by the term, the site and who is running the job. November 2026. No email address required.
Ask three sources what builder’s risk costs and you get three answers. One Ontario brokerage says half a percent to one percent of the build value. Two others say one to four. A rate-comparison site puts a six-month new build at $4,000 to $6,000, which on an ordinary Ontario custom house is the low camp. On a $500,000 build that is a spread from $2,500 to $20,000 for the same tarp over the same job. This calculator uses our planning numbers inside that range, shows the top of the published range beside them so nobody is surprised, and then writes the quote request sheet you send to a broker of your own choosing so the quotes come back on the same build.
Step-by-step
Builder’s Risk Premium Estimate (Ontario, November 2026)
1
The build
Labour and materials to build the house, excluding the land and the lot servicing. This is the insured amount an underwriter rates on.
Policies are written for 3, 6, 9 or 12 months. Longer builds are priced pro rata; one extension is usually granted.
Additions and major renovations are sometimes an endorsement on the home policy instead of a stand-alone policy; the calculator notes that in the result.
2
Who is running it, and where
Underwriters ask “Is the project managed by a professional general contractor?” first. An owner-builder with no track record pays more and gets asked more questions. Our assumption: plus 25 to 50 percent.
The Fire Underwriters Survey grades dwellings 1 to 5 on this. A BC newspaper quoting brokers puts unprotected at 30 to 100 percent more; we use 30 and 65.
We build ICF, and we have not found a Canadian insurer that publishes an ICF discount. Ask the broker to rate it as masonry; do not budget on a discount.
3
The policy
Every source agrees a higher deductible lowers the premium; none prints a percent, so these are our assumptions. Water damage often carries a higher deductible of its own.
Lenders accept either; all-risk is the one worth having on a long build.
Theft of lumber, windows and copper is the everyday claim.
BuildersOntario.com
Your Construction Insurance Budget
Illustrative budget
| Line | Low | Middle | High |
|---|
Middle total for the term, including 8% Ontario RST on insurance premiums–
Example only, in November 2026 Canadian ranges. The base rates (0.5, 0.9 and 1.5 percent of hard cost for a 12-month term) are our planning numbers inside published Canadian ranges that run from 0.5 to 4 percent; the adjustments for owner-builders, fire protection, deductible, form, security, soft costs and log construction are our assumptions and are labelled as such. Ontario retail sales tax of 8 percent applies to most property insurance premiums; HST does not. Not a quote. A premium comes from a RIBO-licensed broker.
Your Quote Request Sheet
Your build, term, site and policy choices become a one-page description any broker can quote on. Nothing is sent to us. Copy it, paste it into an email to a RIBO-licensed broker of your choosing, and send the same sheet to a second broker so the quotes come back on the same build.
The numbers behind the calculator
| Item | Published range (Canada, November 2026) | Calculator uses |
|---|---|---|
| Builder’s risk premium, percent of completed rebuild value (land excluded), about a 12-month term | 0.5% to 1% (an Ontario and Quebec brokerage, a Canadian marketplace); 1% to 4% (two Ontario brokerages, a comparison site); 1% to 5% (a US source) | 0.5 / 0.9 / 1.5% (our planning numbers) |
| Six-month new build, Ontario dollar example (a rate-comparison site) | $4,000 to $6,000 | used to anchor the low camp |
| Owner-builder with no licensed GC | no published loading; underwriters ask first | +25% to +50% (our assumption) |
| Unprotected fire grade (more than 8 km to a fire hall) | +30% to +100% (brokers quoted in a BC newspaper); up to 70% lower when protected (Fire Underwriters Survey) | +30% to +100%, middle +65% |
| Deductible, policy form, site security, soft costs | direction agreed by every source; no percents published | -10% to +15% (our assumptions, labelled) |
| Owner premises liability, $2,000,000, a year | about $500 to $1,500 for a general contractor at $2M (an Ontario brokerage page, indicative) | $500 / $1,000 / $1,500 a year, pro rata |
| Ontario retail sales tax on insurance premiums | 8% on most property insurance; no HST | 8% |
Canadian sources, November 2026. The base rates are planning numbers inside the published range, not an insurer’s rate card. The deductible, form, security, soft-cost and owner-builder adjustments are our assumptions about direction and size; every source agrees on the direction and none publishes the size.
Why insurance prices are all over the map: the brokerages, insurers’ guides and lenders we checked for this page do not agree on the first number. An Ontario and Quebec brokerage and a Canadian renovation marketplace put builder’s risk at half a percent to one percent of the build value; two Ontario brokerages and a Canadian comparison site say one to four percent; a US personal-finance site says one to five. The only Ontario dollar example we found, $4,000 to $6,000 for a six-month build, sits in the low camp. On a $500,000 house that is $2,500 at one end and $20,000 at the other. The gap is the term, the deductible, who is running the job, how far the fire hall is, and whether soft costs and liability are in the price. Budget about one percent of hard cost, roughly $4,500 on a $500,000 house, and get two or three quotes on the same written description of the build; the sheet this calculator writes is that description.
Two builds, worked out
| Build | Middle arithmetic | Before tax |
|---|---|---|
| $500,000 hard cost, 12 months, licensed builder, protected lot, $2,500 deductible, all-risk | $500,000 x 0.9% = $4,500. Low $2,500 (0.5%), high $7,500 (1.5%). Published top: $20,000 (4%). | $4,500 |
| $1,000,000 hard cost, 14 months, owner-builder, no hydrant, soft costs added | $1,000,000 x 0.9% x 14/12 = $10,500; owner-builder +35% = $3,675; no hydrant +30% = $3,150; subtotal $17,325; soft costs +10% = $1,733 (rounded) | $19,058 |
The second build shows how an ordinary house ends up at two percent of hard cost without anyone being robbed: a long term, no general contractor, no hydrant and the soft-cost endorsement each take a bite. It also shows why the four-percent camp exists.
Where people go wrong
- Insuring the lot price instead of the rebuild cost. The land does not burn. The insured amount is the hard cost of the finished house, and the lender will want the appraised completion value. What the lender wants.
- Setting the term for the hopeful schedule. Winter, backorders and a slow inspector happen to everyone. Price the real schedule plus two months, and ask what the extension costs before you bind.
- Comparing a quote with soft costs and liability against one without. Line them up on the same sheet. What builder’s risk covers and excludes.
- Letting the first load of lumber arrive before the policy is bound. Theft on day two is on you. The before-you-break-ground checklist.
- Forgetting the policy ends when you move in. Have the finished-house policy start the day the builder’s risk ends, with no gap. Builder’s risk vs home insurance.
Questions people ask
How much does builder’s risk insurance cost in Ontario in 2026?
Published Canadian ranges run from half a percent to four percent of the completed rebuild value, and the one Ontario dollar example we found puts a six-month new build at $4,000 to $6,000. Our planning number is about one percent of hard cost for a 12-month build by a licensed builder in a protected area: roughly $4,500 on a $500,000 house and $9,000 on a $1,000,000 house, before the 8 percent retail sales tax. Owner-builders, rural lots without a hydrant, long terms and soft-cost cover push it up.
Is builder’s risk calculated on the construction cost or the finished value?
On the completed rebuild value of the structure, which for a new house is the hard construction cost, excluding the land. Your lender will ask for the appraised completion value; make sure the broker and the lender are using the same number before the first draw.
Can I pay the premium monthly?
Most builder’s risk policies are a single premium for the term, paid when the policy is bound; some brokers can arrange financing. Ask. The calculator’s “quote request sheet” asks the broker to state it.
Does building with ICF or concrete lower the premium?
Not automatically. We build ICF and we have not found a Canadian insurer that publishes an ICF discount; the industry claims of lower premiums come from US disaster regions. Ask the broker to rate the walls as masonry or non-combustible and see what comes back, but budget on no discount. ICF, log, SIP and modular insurance.
Does a higher deductible really lower the cost?
Yes, every source agrees on the direction; none publishes the size, so the calculator’s 8 percent either way is our assumption. Pick the deductible you could actually pay the week after a theft, then ask the broker what each step saves.
Why does the calculator show a number four times higher than its own estimate?
Because two Ontario brokerages and a comparison site publish “one to four percent”, and we would rather you see the top of that range here than in a quote. If a quote lands near it, ask what is driving it: an owner-builder, an unprotected lot, a long term, soft costs and liability bundled in, or a claims history. What builder’s risk costs, in detail.
Insurance is one line in the budget. Get the other lines right too.
The construction insurance hub covers the three policies every build needs and who carries each; the checklist is what to have in hand before you break ground.
