Every new home in Ontario comes with it. Most buyers don't fully understand it until they need it.
Every newly built home in Ontario comes with a warranty most buyers have heard of but few fully understand. They know the name. They know it covers "stuff that goes wrong." But when something actually does go wrong — and in new construction, something usually does — that's when the gaps show up.
The Tarion warranty is one of the most valuable protections available to new home buyers in Ontario. It is also time-sensitive, paperwork-dependent, and easy to lose if you don't know how it works. This is a plain-language breakdown of what it covers, for how long, what it doesn't cover, and exactly what you need to do to protect yourself.
What Tarion Actually Is
Tarion is a non-profit organization designated by the Ontario government to administer the province's new home warranty program under the Ontario New Home Warranties Plan Act. It is not your builder, and it does not do the repairs itself. Think of it as the rules and backstop behind the warranty your builder is legally required to provide.
When a builder doesn't fix something they should, or fails entirely — through insolvency, abandonment, or refusal — Tarion is the body that steps in, assesses the situation, and ensures buyers receive the protection they're entitled to under the law.
Coverage begins on the date you take possession and applies automatically. You don't purchase Tarion separately — it comes with every new home built by a registered Ontario builder. And critically: it stays with the home, not the buyer. If you sell within the warranty period, the remaining coverage transfers to the new owner.
As of January 1, 2026, freehold buyers who register their purchase with Tarion within 45 days of signing their Agreement of Purchase and Sale qualify for the maximum available deposit coverage. If you're buying pre-construction, registering early through Tarion's MyHome portal is worth doing immediately after you sign.
The Three Coverage Periods
Tarion protection is structured in three distinct layers, each covering different types of defects over different timeframes. Understanding the difference between them matters — a claim that belongs in year one cannot be filed under the seven-year window just because you missed the earlier deadline.
One-Year Warranty — Workmanship & Materials
The broadest coverage period. Begins on possession date and covers defects in workmanship and materials that appear in your first year of ownership. This is the phase where most cosmetic and functional issues surface — things you notice after you move in and start living in the home.
Also covers Ontario Building Code violations affecting health and safety, and major issues like water penetration or heating and electrical systems that aren't functioning properly.
Two-Year Warranty — Building Envelope & Systems
Year two coverage gets more specific. It focuses on the systems behind the walls and the building envelope — the components most likely to cause long-term damage if they fail. Water penetration is a particular focus here: leaks through windows, walls, and the building envelope that weren't apparent in year one often become visible after a full seasonal cycle.
This period also covers defects in the electrical, plumbing, and heating distribution systems, as well as Ontario Building Code violations that affect health and safety.
Seven-Year Warranty — Major Structural Defects
The longest coverage period, and the most narrowly defined. The seven-year warranty covers major structural defects (MSDs) — serious failures affecting the load-bearing elements of the home that materially impact your ability to use it for its intended residential purpose. This means foundation issues, critical structural movement, and failures in load-bearing framing.
This is not a catch-all for anything that goes wrong in year three or beyond. It applies specifically to structural integrity. If you suspect a major structural issue, treat it as a safety concern first — document it carefully and report it through the correct channel immediately.
Deposit Protection: Especially Important for Pre-Construction Buyers
If you're buying pre-construction — where your deposit may be paid a year or more before you ever take possession — Tarion provides a critical backstop. If a builder becomes insolvent, abandons a project, or fails to complete construction, Tarion's deposit protection ensures buyers can recover their protected deposit amounts.
Coverage limits apply and vary depending on your Agreement of Purchase and Sale date and the type of home. Freehold and condominium units have different caps, and recent regulatory changes have updated the limits on newer projects. Your lawyer will confirm the specific limits applicable to your purchase — but the key takeaway for pre-construction buyers is that your deposit is not exposed to builder failure in the way it would be without this protection in place.
If your closing or occupancy is delayed beyond the firm date in your agreement and no valid exception applies, Tarion provides compensation that can include a daily living expense allowance and eligible moving or storage costs. Delays in new construction are common — knowing this protection exists before it happens is better than finding out after.
What Tarion Does Not Cover
This is where many buyers get caught off guard. Tarion is not a blanket guarantee that everything in your new home will be repaired forever. Understanding the exclusions matters as much as understanding the coverage.
| Not covered by Tarion | Why |
|---|---|
| Normal wear and tear | Expected deterioration from regular use is not a construction defect |
| Cosmetic damage caused by the owner | Tarion covers defects, not damage resulting from how the home is used |
| Condensation and dampness (unless caused by construction defect) | Condensation is often a lifestyle or ventilation issue, not a building defect |
| Appliances | Covered under the manufacturer's separate warranty |
| Issues caused by unauthorized alterations or repairs | DIY repairs or modifications can void coverage — always check before acting |
| Secondary damage caused by an excluded item | If the root cause isn't covered, related damage typically isn't either |
| Issues not reported within the correct window | Tarion's system is deadline-driven — missed reporting windows can permanently void a claim |
Key Deadlines and When to Submit
This is the part of the Tarion warranty that catches buyers most off guard — and it's the part that matters most in practice. Tarion coverage is not open-ended. It runs on a strict reporting schedule, and missing a window can permanently eliminate your right to make a claim, even if the defect is legitimate and clearly covered.
"The most expensive Tarion mistake isn't a construction defect. It's a missed deadline."
- 1 Pre-Delivery Inspection (PDI). Before you receive your keys, you and your builder walk through the home together. Any damage, incomplete work, or items that aren't functioning are noted on the official PDI form. This document becomes your baseline — what was wrong before you moved in versus what appeared after.
- 2 30-Day Form. Within 30 days of possession, you can submit new issues that weren't present at the PDI. Don't wait to see if problems resolve themselves — document and submit.
- 3 Year-End Form. Submitted in the period approaching your one-year anniversary. This is your final opportunity to capture issues that appeared during your first year of ownership and haven't been reported yet. Start compiling this list well before the deadline — not in the final days.
- 4 Two-Year Form. Similar to the Year-End Form, this is submitted approaching the end of your second year and captures any new issues under the two-year coverage period, particularly water penetration and systems defects.
- 5 Seven-Year Window. Major structural defects can be reported at any point within the seven-year coverage period from your possession date. If you suspect a structural issue, report it immediately — don't wait for a scheduled form window.
Start a home log from day one — photos, dates, and brief notes for anything you notice. It takes five minutes and becomes invaluable if a dispute ever goes to conciliation. A well-documented timeline almost always strengthens a homeowner's position; an undocumented one rarely does.
What Happens If Your Builder Doesn't Fix It
If you submit a valid warranty claim and your builder fails to address it within the required timelines, the next step is requesting Tarion conciliation. A Tarion inspector assesses the item in question and determines whether it falls within warranty coverage. If it does and the builder still hasn't acted, Tarion has the authority to step in directly — either requiring the builder to complete repairs or compensating the homeowner up to the applicable coverage limits.
The process is designed to give the builder a fair opportunity to resolve issues first. Providing reasonable access, keeping communication in writing, and documenting what was attempted and what remained unresolved will all strengthen your position if a dispute escalates.
How to Check Your Builder Before You Buy
Tarion maintains the Ontario Builder Directory — a publicly searchable registry of every registered builder in the province. Before signing any Agreement of Purchase and Sale, it's worth searching your builder's name to review their registration status, any past warranty claims, chargeable conciliations, and their history of project completions.
Not all builders are equal, even though they all operate under the same warranty framework. A builder with a pattern of unresolved claims or regulatory issues is a meaningful red flag that's visible before you commit — if you know to look.
Buying a New or Pre-Construction Home in Ottawa?
We work with buyers at every stage of new construction — from pre-signing research to possession day and beyond. Let's make sure you go in with the right information.
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