Buying a House the Seller Built Themselves in Ontario: Four Questions to Ask Before the Home Inspection
“Custom-built by the owners” sounds like a selling point. Under Ontario law it is also a statement about who carries the warranty, and for an owner-built home the answer is nobody. Here is how to find out which kind of house you are actually looking at.
What does a buyer actually inherit with a Tarion-enrolled home versus an owner-built one?
Put the two side by side. Tarion-enrolled home: the statutory warranty in ONHWPA s.13 (workmanship and materials, fitness for habitation, Building Code compliance, no major structural defects) runs to the “owner,” a term that includes successors in title, so a resale buyer steps into whatever time is left: claims under s.13(4) within one year of the possession date on the completion certificate, plus longer periods in Reg. 892 (a second-year claim period, and a major structural defect claim period ending on the seventh anniversary of possession), backed by the s.14 guarantee fund. Owner-built home: no vendor ever existed, so there is no s.13 warranty to inherit and no guarantee-fund claim; what you get is the house, the seller’s disclosure, and whatever records the seller kept.
Source: Ontario New Home Warranties Plan Act, R.S.O. 1990, c. O.31, ss. 1, 13, 14; R.R.O. 1990, Reg. 892, s. 1; HCRA, “Do I Need a Licence?” (accessed 2026)
I’m Arthur Zhao, a real estate broker in Toronto. Picture the listing: a detached house on a large lot, finished to a standard the neighbouring homes don’t match, and one line in the remarks that reads “custom-built by the current owners.” It reads like a compliment to the house. It is also a legal fact about it.
Ontario splits new-home rules between two statutes and two regulators, and an owner-built house sits outside most of both. That is not automatically a problem. It does mean the questions you would ask about a builder’s home, such as which warranty applies and how much of it remains, have different answers here, and the seller holds most of the facts you need. Below are the four questions I would put to the seller’s side, in the order I would ask them, before you book the inspection or firm up an offer.
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Why “owner-built” is a legal category, not a marketing phrase
Two laws are involved. The New Home Construction Licensing Act, 2017 (NHCLA) decides who must hold a builder or vendor licence, and the Home Construction Regulatory Authority (HCRA) issues those licences. The Ontario New Home Warranties Plan Act (ONHWPA) creates the statutory warranty and the enrolment system, administered by Tarion.
Both statutes define an owner-builder in the same words: “an individual who constructs or manages the construction of a residential dwelling for the individual’s personal use and occupation,” subject to any prescribed requirements. The NHCLA then says, in s.37(3), that “An owner-builder is not a builder unless prescribed otherwise.” Checked on October 5, 2026, the three regulations that could add conditions (Reg. 892 under the ONHWPA, and O. Reg. 626/20 and 631/20 under the NHCLA) contain no owner-builder provisions at all, so the definition stands on the statute alone.
For you as a buyer, the consequence comes from the warranty side. ONHWPA s.13 is a promise made by a vendor to an owner. HCRA’s own licensing page puts it plainly: an owner-built home “is not eligible for warranty coverage under the Ontario New Home Warranties Plan Act (ONHWPA) and will not have statutory warranty coverage.”
Question 1: Who pulled the permit, who signed with the trades, and who paid them?
HCRA’s Advisory 4 (last updated February 1, 2021) explains how the line is drawn: it turns on whether a contractor had “sufficient control of the construction of the home,” and the advisory states that “No one factor is determinative.” The factors it lists translate directly into questions for the seller, laid out below. The title the seller gives the contractor does not settle it; the advisory says the answer “does not depend on the title given to that person,” whether builder, contractor, general contractor or project manager.
HCRA Advisory 4 indicators, as questions you can ask
Question 2: Was the home ever enrolled with Tarion?
If no, and the build was genuinely owner-controlled, this is not a registration the seller forgot to file. Enrolment is a duty the Act places on a vendor before selling (s.10.1) and on a builder before signing a construction contract or starting work (s.10.2). An owner-builder is neither. Advisory 4 says it directly: where there is no contractor meeting the builder definition, “enrolment of the home is not necessary and statutory warranty coverage would not apply.”
ℹ️A finished owner-built home has no route into the warranty plan after the fact. The enrolment application in ONHWPA s.10.3(2) belongs to “a builder of a home or a prescribed person,” and s.17.6, which would let regulations apply parts of the Act to owner-builders, has no regulation made under it.
Question 3: Did the seller live in the house, and when did they sign to sell it?
What does have legal weight is whether the home was occupied before the sale. The ONHWPA defines a vendor as a person who sells “a home not previously occupied,” and s.1 adds that “sell” includes entering into an agreement to sell. Reading those two definitions together: a seller who signs an agreement of purchase and sale before ever moving in is selling a home not previously occupied, and falls within the vendor definition. A vendor needs a licence under NHCLA s.37(1) and must meet the enrolment requirements in ONHWPA s.10.1 before selling or offering to sell. HCRA’s licensing page frames the owner-builder exemption the same way: it applies “provided they do not sell the home after construction.”
So ask when the seller moved in and whether anyone lived in the house before the listing. A seller who built it, lived in it and is now moving on is in a different legal position from one who built it and listed it straight away.
⚠️If the seller never lived in the house before signing to sell it, you are no longer looking at an owner-builder resale. Ask your lawyer to review the transaction against NHCLA s.37(1) and ONHWPA s.10.1 before you firm up.
Question 4: What did the seller write on the SPIS and in Schedule A?
Form 220 (Seller Property Information Statement – Residential), look at question 16: “Are you aware of any past or pending claims under the Tarion Warranty Corporation (formerly ONHWP)?” followed by a blank for the Tarion/ONHWP registration number. For an owner-built home, a blank there is the expected answer; what you want to see beside it is a written explanation that the home was owner-built and never enrolled. Question 15 on the same form asks the approximate age of the building and any additions.
On the agreement itself, OREA’s clause NEW-1 (“Builder Registered”) has the seller warrant that the home and its builder are both registered under the Ontario New Home Warranty Plan. That clause cannot truthfully appear in the sale of an owner-built home. OREA’s standard clause library has no clause written for owner-built homes, so any statement about owner-built status, the absence of enrolment, or occupancy has to be custom wording in Schedule A. Have your lawyer review that wording before you sign; it is the one place the seller’s account of Questions 1 to 3 becomes part of the contract.
💡 My own view: for a buyer, “no Tarion warranty” is a pricing and inspection-strategy question, not a legal defect in the property. The house can be well built; what is missing is the third party that would otherwise stand behind it. So shift the effort from paperwork you will never get to evidence you can get. Book an independent home inspection, and ask the seller for the building permit and the municipal inspection and final inspection records, any engineering or structural drawings, and the main trade contracts. How complete that file is tells you how much of the build you can verify and how much you are taking on trust.
A building permit is not a builder licence
A seller may point to the municipal permit as proof the build was “approved.” A municipal building permit and an HCRA licence answer different questions. The permit concerns the construction under the Building Code; the licence concerns who is allowed to act as a builder or vendor of a new home. HCRA’s page states that an owner-builder still takes on “obtaining the necessary municipal permits.” A permit file is valuable evidence of how the house was built and inspected. It is not evidence that anyone held a licence or that a warranty exists.
What changes once you own it
If you buy an owner-built home that the seller lived in, you are not the owner-builder. Reading the ONHWPA definitions, you also did not acquire it from a vendor, so you are not an “owner” in that Act’s sense, and a later resale by you would be the sale of a previously occupied home and would fall outside the vendor definition. The house remains a home without statutory warranty coverage for every later buyer too, so the records you collect now are the records your own buyer will ask you for. HST on a self-built home is a separate federal tax question; it is covered in the related reading below.
- New Home Construction Licensing Act, 2017, S.O. 2017, c. 33, Sched. 1 (s.1 definitions; s.37)
- Ontario New Home Warranties Plan Act, R.S.O. 1990, c. O.31 (ss. 1, 10.1, 10.2, 13, 14, 17.6)
- R.R.O. 1990, Reg. 892, Administration of the Plan (s.1 claim-period definitions)
- HCRA, Do I Need a Licence?
- HCRA Advisory 4, Common Definition of “Builder” (last updated February 1, 2021)
- HCRA Advisory 6, Common Definition of “Owner” (last updated February 1, 2021)
- OREA Form 220, Seller Property Information Statement – Residential (question 16); OREA standard clause NEW-1, Builder Registered
Construction & Self-Build Mortgages in Ontario: How Progress-Draw Financing Actually Works →You Gutted and Rebuilt It, Now You’re Selling: When a Resale Home Can Become a Taxable “New” House →Ontario’s HCRA Builder Licensing: How to Vet a Builder Before You Buy New →Pre-Construction Buying Guide →
Frequently Asked Questions
The seller can’t give me a Tarion registration number. Is that a red flag?
Not on its own. An owner-built home was never enrolled because no vendor or builder existed to enrol it; HCRA Advisory 4 (2021) says enrolment “is not necessary” in that case. It becomes a red flag if the seller hired one contractor who controlled the whole build, because that contractor met the builder definition and the home should have been enrolled.
The house was finished but the seller never actually moved in. Does that change anything?
Yes. Under ONHWPA s.1 a vendor is a person who, on their own behalf, sells a home not previously occupied, and sell includes entering into an agreement to sell. A seller who never occupied the house is offering a home not previously occupied, which brings in NHCLA s.37(1) (a vendor licence) and ONHWPA s.10.1 (the Registrar’s confirmation of enrolment before selling or offering to sell). HCRA’s own page ties the owner-builder exemption to the person not selling the home after construction.
The seller says a general contractor built the house, but the contractor had no HCRA licence. What does that mean?
NHCLA s.37(2) bars anyone from constructing a new home without a builder licence, and ONHWPA s.10.2 requires a builder to be licensed and to have the home enrolled before signing a construction contract. Advisory 4 lists an unlicensed contractor and an unenrolled home as indicators of an owner-built project, but no single factor decides it. Treat this as a question for a real estate lawyer, with the contracts and invoices in hand.
If I buy an owner-built home, will I need a licence to sell it later?
Reading the ONHWPA definitions, no: a vendor is someone who sells “a home not previously occupied,” and a house the seller and then you have lived in has been occupied. The home also stays without statutory warranty coverage, so keep the permit and inspection records for your own buyer.
Is my deposit on an owner-built resale protected by Tarion’s guarantee fund?
Not under ONHWPA s.14(1). That deposit protection runs in favour of a purchaser under a purchase agreement with a vendor, and it is triggered by a statutory rescission right or by the vendor’s bankruptcy or fundamental breach. An owner-built home that the seller lived in has no vendor in the ONHWPA sense, so there is no s.14 claim to fall back on; how the deposit is held is a matter for the agreement of purchase and sale and the trust account that receives it.
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