A construction warranty is a contractual promise that the contractor will fix defects in workmanship or materials, typically for a correction period running from the date of ready-for-takeover. Manufacturer and system warranties run on separate timelines, and liability for latent defects can stretch well beyond that first year. Owners who understand this upfront avoid the most common closeout mistake: assuming coverage ends the day the correction period does.

TL;DR:

  • Warranties include express, implied, product, and system types, each with specific obligations for contractors, manufacturers, and suppliers.
  • Warranty coverage generally covers repair or replacement of defective workmanship and contractor-supplied materials during the correction period, but excludes labor, transport, and owner-caused damages.
  • The standard correction period lasts about one year from Ready-for-Takeover, but latent defect liabilities can extend beyond that depending on contract language and legal exceptions.
  • Owners should promptly give written notice and thoroughly document defects, with an 11-month review meeting as a critical risk management step.
  • Managing warranties across multiple properties requires a central register tracking key dates, maintenance conditions, and claim contacts, ideally established before project completion.
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Table of Contents

What are the types of construction warranties?

A construction warranty falls into two broad categories: express warranties written into the contract, and implied warranties that Canadian courts read into the deal even when nobody wrote them down. On top of those, product and system warranties from manufacturers layer on separate obligations that a general contractor has to track and flow down to subcontractors.

Express warranties spell out specific promises: the contractor guarantees workmanship for a defined period, or guarantees particular materials against defects. Implied warranties exist under Canadian common law regardless of contract wording. Courts have long held that construction work must be performed in a “good and workmanlike manner” and, in many cases, must be fit for its intended purpose, even without an explicit clause saying so.

  • Express warranty — a written promise in the construction contract, usually covering labour and materials supplied by the contractor.
  • Implied warranty — a legal obligation Canadian courts recognize even without contract language, tied to workmanship and fitness for purpose.
  • Product warranty — issued by the manufacturer, covers the physical product itself.
  • System warranty — covers an assembled system (a roofing membrane, a mechanical package) and often requires a certified installer to remain valid.

The general contractor typically remains responsible to the owner for the whole scope, then passes corresponding warranty obligations to the subcontractors and suppliers who actually performed the work.

What does a construction warranty actually cover?

Coverage generally means the contractor repairs or replaces defective workmanship and contractor-supplied materials at no cost to the owner during the correction period. It does not usually mean full replacement of manufactured products, consequential damage payouts, or coverage for problems caused by the owner’s own use of the building.

Repaired commercial wall corner and baseboard

Manufacturer warranties are narrower than most owners expect. They typically cover replacement of the product itself but exclude labour, transport, and reinstallation costs, and system warranties can restrict remedies further, sometimes requiring an approved installer to keep coverage intact.

Common exclusions and voiding triggers:

  • Normal wear and tear on finishes, hardware, and mechanical components.
  • Damage from improper maintenance or skipped service intervals.
  • Owner-made alterations to warranted systems without contractor sign-off.
  • Failure to follow the operations and maintenance (O&M) manual supplied at closeout.
  • Installation that deviates from manufacturer protocol, a leading reason manufacturer warranties get voided outright.

Pro Tip: Read the O&M manual the week you take possession, not the week something breaks. Half of voided warranty claims trace back to a maintenance step nobody knew existed.

How long does a construction warranty last?

The standard correction period under CCDC 2 – 2020 runs one year from Ready-for-Takeover, also called substantial performance. Extended product and system warranties run on their own clocks, often starting at installation or purchase rather than takeover, which means an owner can be tracking five or six different expiry dates on one project.

Latent defects complicate this further. A defect that is not reasonably discoverable during the correction period, a structural flaw hidden behind finished walls, for example, can surface years later. The one-year correction period does not automatically cap the contractor’s liability for those defects.

  • The correction period typically starts at Ready-for-Takeover, not at contract signing or final invoice.
  • Manufacturer warranties may start earlier or later depending on when the product ships or gets installed.
  • Latent-defect claims can survive past the correction period under general limitation and repose rules, especially if contract language does not clearly exclude such liability.
  • The 2024 Supreme Court of Canada decision in Earthco Soil Mixtures Inc. v Pine Valley Enterprises Inc. confirmed there is no fixed set of “magic words” required to exclude an implied warranty. Courts now look at the objective intent behind the whole contract, which makes clear, specific exclusion language more important than ever.

How do you make a warranty claim?

You make a warranty claim by giving the contractor formal written notice as soon as a defect is discovered, documenting it thoroughly, and following the notice procedure set out in the contract. Waiting, or reporting verbally without a paper trail, is the single fastest way to weaken an otherwise valid claim.

  1. Give written notice promptly. Identify the defect, its location, and the date discovered. Send it to the contact named in the contract, and keep a copy.
  2. Document the defect. Photograph it from multiple angles, tag the location on the as-built drawings, and log it in a defect inspection sheet.
  3. Run an 11-month warranty review. Scheduling this meeting with the general contractor, consultants, and building operations staff, roughly one month before the correction period expires, catches outstanding items while the contractor still has a clear obligation to act.
  4. Escalate if needed. Options include direct negotiation, drawing on a performance bond or letter of credit, filing under latent-defect insurance where it exists, or pursuing formal legal remedies as a last resort.

Pro Tip: Treat the 11-month review as a standing calendar item on every commercial project, not a one-off. It is the cheapest risk-management step available to a property owner, and most owners skip it entirely.

How should warranty terms be written into the contract?

Contract language should state exclusions in plain, specific terms, mirror the general contractor’s warranty obligations down to every subcontractor, and spell out exactly what an extended manufacturer warranty provides versus what it leaves for the owner to cover.

The Earthco decision means vague boilerplate exclusion clauses carry more risk than they used to; courts will read the whole contract for objective intent rather than hunting for a specific phrase. That pushes owners and contractors toward documenting intent clearly at the drafting stage, not arguing about it after a defect shows up.

  • Match subcontractor warranty terms to the GC’s obligations to the owner; a gap here leaves the GC holding liability with no recourse downstream.
  • Spell out whether extended warranties include labour and reinstallation or only replacement product.
  • Set clear notice periods, and consider holdbacks, escrow, or bonds tied to warranty performance on larger contracts.
  • Require specific documentation deliverables (O&M manuals, certificates, as-builts) as a condition of substantial performance sign-off, not an afterthought.

How do you manage warranties across a commercial portfolio?

You manage warranties across multiple properties with a central register tracking start dates, expiry dates, maintenance conditions, and claim contacts for every warranted item, backed by organized O&M documentation collected at closeout. Without that system, portfolio owners routinely miss claims simply because nobody was watching the calendar.

A usable register tracks, at minimum: the item, its warrantor, start date, expiry date, any maintenance conditions attached, the responsible party, and who to contact to file a claim. Pair that register with a closeout package containing every O&M manual, manufacturer certificate, and supplier contact, indexed so building operations staff can find the right document in minutes rather than hours.

  • Build the register before substantial performance, not after, so nothing gets missed during handover.
  • For tenant improvements, retail and restaurant buildouts, and warehouse renovations delivered inside occupied buildings, confirm which trades’ warranties start at their own completion date rather than the overall project’s takeover date.
  • Review compliance and contractor-responsibility processes against a framework like MOSAIC’s compliance guidance when setting up internal controls for a larger asset portfolio.
  • Hand building operations a repeatable checklist, not a one-time binder, so the register gets updated as items are resolved or new work is added.

Pro Tip: A spreadsheet works fine for one building. Past three or four active properties, a shared register with expiry alerts is the difference between catching a claim on day 340 and finding out on day 400 that it is too late.

A contractor’s view on warranty closeout

Multigroup delivers tenant improvements, retail and restaurant buildouts, and warehouse renovations under the BC Building Code and municipal permitting, often inside buildings that stay occupied through construction. On a recent commercial renovation, the 11-month review brought the client’s property manager, our site super, and the mechanical subcontractor to the table together, and it turned up two deficiencies neither party had logged yet. Start warranty conversations at the procurement stage, not the week before handover.

— MultigroupTeam

How Multigroup keeps warranty risk manageable on commercial builds

Some contractors handle warranty closeout as part of the build, rather than chasing it down after the fact. Where a lot of commercial GCs hand over the keys and disappear, Multigroup runs the 11-month review, maintains the closeout register, and hands building operations a documented package they can actually use, at no extra scramble on your end.

Multigroup

Some commercial general contractors have experience sequencing warranty-sensitive work inside occupied retail floors, warehouses, and multi-tenant office buildings without disrupting operations. That experience shapes how we scope commercial renovations, tenant improvements, retail and restaurant buildouts, warehouse renovations, and coffee shop conversions from day one, with warranty documentation built into the closeout plan rather than tacked on at the end. If you have a commercial project coming up, get in touch to talk through how warranty and closeout would work on your building.

Sources

For deeper reading, see the CCDC warranty bulletin, the Earthco decision analysis, and the latent-defect risk guide.

FAQ

What is the standard construction warranty?

Under CCDC 2 – 2020, the standard contractor warranty is a correction period running approximately one year from Ready-for-Takeover, covering defects in workmanship and contractor-supplied materials.

How long does a builder have to warranty their work?

A builder’s correction-period obligation typically runs roughly one year from substantial performance, but liability for latent defects can extend beyond that period depending on contract language and limitation rules.

What voids a builder’s warranty?

Improper installation, skipped manufacturer maintenance protocols, unauthorized owner alterations, and failure to follow the O&M manual are the most common ways a warranty gets voided.

What is covered under a 10-year structural warranty?

A structural warranty of that length is a distinct, separately negotiated instrument from the standard one-year correction period, and its scope varies by contract; owners should confirm exact coverage and exclusions in writing rather than assume a standard definition applies.

Is a construction warranty the same as insurance?

No. A construction warranty is a contractor’s contractual promise to repair defects, while insurance is a separate financial instrument, such as latent-defect coverage, that protects against loss when a warrantor cannot or will not perform.