Published 7 September 2026 · By Jatin Dua, Broker of Record, RE/MAX Quantum Realty
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Get My Free Estimate →The money question everyone asks first is the wrong one. Custom build cost per square foot in Toronto varies so widely by site, design and finish that any figure quoted in an article is misleading — get it from a builder pricing your actual drawings. The question that actually determines your outcome is sequence.
The order is: zoning review, then heritage and conservation status, then TRCA clearance where the property is in a regulated area, then tree permits, then the building permit, then construction. Doing design work before you know what TRCA or a heritage district will accept is design work you may pay for twice.
Why sequence beats budget
Most custom projects in Toronto that go badly do not go badly because the builder was expensive. They go badly because approvals were discovered in the wrong order, and drawings had to be redone.
Here is the order that works.
| Step | What you are establishing | Why it comes first |
|---|---|---|
| 1. Zoning review | The permitted building envelope for this specific address, including exceptions | Everything downstream depends on it |
| 2. Heritage status | Part IV designation, or a Part V district plan | A district plan can rule out demolition entirely |
| 3. Ravine and TRCA mapping | Chapter 658 protected area; TRCA regulated area under O. Reg. 41/24 | TRCA clearance must precede a building permit |
| 4. Tree inventory | Every privately owned tree of 30 cm trunk diameter or more | Determines what can be removed and at what cost |
| 5. Concept design | What is actually buildable, given 1–4 | Design against reality, not against hope |
| 6. Variance, if still required | Committee of Adjustment | Bill 17 and O. Reg. 462/24 removed some triggers, but not all |
| 7. Building permit | City approval to build | Cannot issue before TRCA clearance where applicable |
| 8. Construction | The part everyone thinks about | The shortest phase in most projects |
Why I will not quote you a cost per square foot
Because it would be dishonest. Custom construction cost in Toronto is driven by the site (slope, access, soil, servicing), the design (spans, glazing, ceiling heights, basement depth), the level of finish, and the market for trades at the moment you build. Two houses of identical size on the same street can differ by a factor that makes any published figure worse than useless.
What you should do instead: get two builders to price the same set of real drawings, and ask both to itemise allowances rather than lump sums. The gap between their numbers will teach you more than any article.
The costs that get left out of budgets
- Designated substances survey and abatement on demolition of an older house — asbestos in plaster, tile, insulation and duct wrap is normal in pre-1980 construction
- Tree replacement or cash in lieu — 120% of the cost of replanting plus two years of maintenance where on-site replanting is not feasible
- Servicing upgrades from the street: water, sanitary, storm, electrical, and replacement of a lead water service line if one is present
- Approval carrying costs — property tax, insurance and financing across a design and approval period that is frequently longer than construction
- Vacant Home Tax exposure. Toronto’s tax is 3% of Current Value Assessment from the 2024 taxation year, an annual declaration is mandatory for every residential property, and failing to declare defaults the property to vacant. File it every year and confirm your situation with the City.
- HST. On a newly built home the federal new housing rebate phases out entirely at $450,000 and the Ontario portion caps at $24,000, so at this level there is effectively no rebate.
Where Tarion fits
If a licensed builder or vendor is building or selling the home, Tarion coverage applies, and the limits are worth knowing before you rely on them:
- Deposit protection up to $100,000 on freehold homes. Condominium deposits are separately protected by the requirement under the Condominium Act that they be held in trust.
- Delayed closing or occupancy compensation of $150 per day for living expenses, to a maximum of $7,500.
- Aggregate warranty caps for agreements signed on or after 1 July 2023: $400,000 for a freehold home, $300,000 for a condominium unit, and up to $3.5 million for common elements.
- A Tarion Warranty Information Sheet, carrying a unique Home ID to verify builder registration, has been mandatory since 14 July 2025.
Note the arithmetic on that third point. On a $6 million custom house, a $400,000 aggregate warranty cap covers a fraction of the build. Tarion is a floor, not a guarantee, and it is not a substitute for choosing the builder carefully and structuring the contract properly.
The 10-day rescission right on new freehold homes
Amendments under the Homeowner Protection Act, 2024 introduced a 10-day rescission right on new freehold home purchase agreements, proclaimed effective 1 January 2026. The ten days run from the latest of receiving the fully signed agreement, receiving the prescribed information, and the builder satisfying any other prescribed requirements. If this applies to your purchase, confirm the current provisions with your lawyer before you rely on the timing.
The practical takeaway
Treat the first three months as a research phase, not a design phase. Zoning review, heritage status, ravine and TRCA mapping, and a measured tree inventory cost a fraction of a set of drawings and determine whether those drawings are worth commissioning at all. Every custom project I have watched go sideways in Toronto skipped that phase.
Frequently asked questions
What approvals do I need to build a custom home in Toronto?
At minimum a building permit under Zoning By-law 569-2013. Depending on the site you may also need: a minor variance from the Committee of Adjustment, a permit under Chapter 813 for any tree of 30 cm trunk diameter or more, a permit under Chapter 658 if the lot is in a mapped ravine protected area, TRCA clearance under O. Reg. 41/24 if the lot is in a regulated area, and a heritage permit if the property is designated or in a Heritage Conservation District.
Does TRCA approval come before or after the building permit?
Before. Where TRCA jurisdiction applies, the City will not issue a building permit until TRCA clearance is obtained. Plan your timeline and your closing date around that, not around the construction schedule.
Do I still need a Committee of Adjustment hearing for minor issues?
Less often. Under Bill 17 and O. Reg. 462/24, setback shortfalls of up to 10% no longer require a minor variance, and multiplexes are exempt from floor space index limits. Whether your design needs a hearing depends on the zone and the specifics, and should be confirmed for the address.
Do I pay HST on a custom home?
GST/HST applies to a newly constructed or substantially renovated home sold by a builder. The federal new housing rebate phases out entirely at $450,000, and the Ontario portion caps at a $24,000 maximum, so at luxury price points there is effectively no rebate. The new first-time home buyers’ GST rebate, for agreements from 27 May 2025, is nil at or above $1,500,000.
Am I covered by Tarion on a custom build?
It depends who is building. Where a licensed builder or vendor is involved, Tarion coverage applies: deposit protection up to $100,000 on freehold homes, delayed closing or occupancy compensation of $150 per day to a maximum of $7,500, and aggregate warranty caps for agreements signed on or after 1 July 2023 of $400,000 for a freehold home and $300,000 for a condominium unit. Confirm your specific arrangement with Tarion and your lawyer.
Do I have to pay the vacant home tax while I build?
Every residential property in Toronto requires an annual declaration of occupancy status. The Vacant Home Tax is 3% of Current Value Assessment from the 2024 taxation year onward. Failing to declare defaults the property to vacant. Speak to the City about how your circumstances are treated and file the declaration every year without exception.
Thinking about buying or selling at the top end?
Send me the address, or the shortlist you are considering. I will tell you what the property is actually worth today, what the land is worth without the house, what the transfer tax and carrying costs will be, and whether the deal makes sense. Confidential, always.
connect@jatindua.com · 437-987-1925 · Book a free consultation
Confidential. Read personally and answered within 24 hours. I never share, sell or distribute your information.
Related reading
- Teardown or renovate? How to judge a $3M Toronto lot
- TRCA permits: the approval that comes before your building permit
- Tarion warranty on a luxury new build: the limits that surprise people
- The Toronto tree bylaw can cost you $100,000. Here is how it works
Sources
Everything above that is a rule, a rate or a published number comes from these. Verify anything that matters to your own deal.
- City of Toronto — Zoning By-law 569-2013, residential provisions
- Toronto and Region Conservation Authority — Replacing an existing home
- City of Toronto — Municipal Code Chapter 813, Trees
- Tarion — Coverage for closing dates and delays
- City of Toronto — Vacant Home Tax
About the author — Jatin Dua, Broker of Record
I’m the Broker of Record at RE/MAX Quantum Realty, 799 The Queensway in Etobicoke, and I work with buyers, sellers and investors across Toronto and the west GTA. A large part of my work sits in the upper end of the market, where the comparables are thin, the rules are heavier and the cost of a wrong number is measured in hundreds of thousands of dollars.
The free estimators on this site are mine. I built them because the first question every owner asks is “what is it worth?” and the honest answer starts with a number you can check yourself. connect@jatindua.com or 437-987-1925.