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Construction Contract Ontario: What to Check Before You Sign
BuildersOntario Construction Contract Centre
Ontario Construction Contracts: What to Check Before You Sign
Understand the scope, price, allowances, deposits, draws, holdbacks, changes, delays, warranties and exit clauses before your project starts.
This is the main Ontario hub for homeowners signing a custom-home, renovation, addition or major construction contract. Start with the problem worrying you most, then open the detailed guide.
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The first problem is often easy to spot: a missing scope, vague allowance, front-loaded payment, weak completion clause or one-sided change provision. Start with the Free Scan, then choose the level of help the project justifies.
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Ontario Lawyer Review
Use a lawyer for enforceability, cancellation, termination, liens, holdback, dispute strategy and project-specific legal advice.
See Lawyer ReviewStart with your real concern
What are you worried will happen after you sign?
Homeowners rarely search for contract doctrine. They search because the price may change, the deposit feels too large, the scope is vague, the completion date means nothing or the contractor has stopped returning calls.
“What exactly is included?”Scope, drawings, specifications, exclusions and missing work.“Can the price increase after I sign?”Fixed price, cost-plus, escalation clauses and open-ended costs.“Are the allowances realistic?”Supply, installation, delivery, HST, markup, overages and unused credits.“Is the deposit too large?”Purpose, refund terms, early purchasing and payments ahead of progress.“Can I be charged for changes I did not approve?”Written authority, price, markup, credits and schedule effects.“What happens if the job is badly delayed?”Completion targets, notices, owner delay, weather and legitimate extensions.“Can a subcontractor lien my property?”Owner exposure, holdback, unpaid trades and the response to a registered lien.“What if the contractor walks off the job?”Evidence, site protection, default notices, Tarion and replacement-contractor takeover.“Can I cancel after signing?”Cooling-off rights, deposits, started work and written cancellation notice.“How do I deal with deficiencies?”Defect records, repair access, warranties, Tarion forms and final payment.“Which dispute process should I use?”Negotiation, mediation, adjudication, arbitration and court.“I need someone to check my actual contract.”Upload the agreement, quotation, drawings and schedules for review.
Ontario facts to know before relying on any contract article
- Contracts signed in your home: Ontario says a home-renovation or repair contract worth $50 or more and signed in the home generally carries a 10-calendar-day cooling-off period. If the homeowner requested work during that period, reasonable compensation may still be payable for supplied work and non-returnable materials. Ontario renovation rights.
- Holdback: the Construction Act generally requires 10% holdback on the price of services or materials as they are actually supplied. Mandatory annual basic-holdback release rules took effect January 1, 2026, and transition rules can affect older contracts. Current Construction Act.
- Prompt payment: where the Act applies, an owner disputing a proper invoice generally must deliver the prescribed non-payment notice within 14 days. Do not substitute an ordinary complaint email for the required process. Construction Act forms and notices.
- New-home builder licensing: Ontario new-home builders and sellers must be licensed by the HCRA. The Ontario Builder Directory shows current licence and regulatory information. Ontario Builder Directory.
- Contract homes: Tarion says significant owner control or responsibility for essential construction elements can cause a custom home to be treated as owner-built rather than an eligible contract home. Tarion contract-home guidance.
- WSIB: clearance requirements depend on the work. A limited exemption exists when an occupant or family member directly retains a contractor for qualifying existing-home renovation work, but the exemption does not automatically extend through the contractor’s subcontract chain. WSIB clearance policy.
The immediate checklist
17 subjects the contract should address clearly
A good contract does not need to be needlessly complicated. It must be specific enough that the owner, builder, lender, consultant and future decision-maker can identify what was promised and how changes will be handled.
1
Correct legal partiesOwner names, contractor’s legal name, business name, address and authorized signer.
2
Property and projectMunicipal address, legal description and a clear description of the improvement.
3
Contract documentsEvery drawing, specification, quotation and schedule identified by date and version.
4
Order of precedenceWhich document controls when drawings, specifications and schedules conflict.
5
Detailed scopeWhat is included, who supplies it and what level of finish is required.
6
Written exclusionsWork, fees, services and materials specifically outside the contract price.
7
Price structureFixed price, cost-plus or hybrid, including HST, fees, markups and contingency.
8
AllowancesWhat each allowance covers and how overages and unused amounts are reconciled.
9
Deposits and drawsAmount, purpose, payment conditions, milestone evidence and invoice timing.
10
Holdback and liensHow statutory holdback is calculated, published, administered and released.
11
Changes and extrasWho can approve changes, required documents, markup, credits and time effects.
12
Start and completionStart conditions, target dates, milestone schedule and the meaning of completion.
13
Permits and inspectionsWho prepares submissions, pays fees, books inspections and corrects failed work.
14
Insurance and WSIBRequired policies, evidence, renewals, exemptions and responsibility for site risk.
15
Deficiencies and warrantiesWalkthrough, reporting method, access, repair verification and warranty handover.
16
Suspension and terminationDefault notice, cure opportunity, payment, Form 8 and site/document handover.
17
Dispute processWritten notice, meeting, mediation, adjudication, arbitration or court as applicable.
Complete hub-and-spoke library
Ontario Construction Contract Centre
Every page below is published. Each guide covers one contract problem in depth and links back to this centre and the related topics needed to understand the complete issue.
1. Before you sign
Confirm the parties, contractor credentials, document completeness, legal review and the warning signs that should stop the signing meeting.
What Should a Good Construction Contract Include?The complete plain-English checklist for scope, price, payment, change, delay, warranty and exit terms.Ontario Construction Contract CheckerUpload the actual agreement and supporting schedules for the Free Contract Scan.Free Ontario Construction Contract TemplateSee the structure of a homeowner contract and the sections that still require project-specific drafting.Construction Contract Red FlagsSpot vague scope, front-loaded payments, one-sided changes, weak schedules and dangerous waiver language.Questions to Ask Before SigningUse focused questions to expose missing drawings, allowances, exclusions, markups and completion rules.Ontario Construction Lawyer ReviewUnderstand when builder experience is enough and when legal interpretation is essential.Verify the Builder or ContractorCheck legal identity, HCRA status, insurance, WSIB, references, claims and business history.Hiring an ICF BuilderApply contract, draw, scheduling and quality-control principles to an ICF home.
2. Scope, price, allowances and materials
Define what the price buys, who carries cost risk, how selections are reconciled and what happens when products or site conditions change.
Included vs. Excluded in the Builder’s EstimateTurn a short estimate into an accountable list of labour, materials, services, fees and owner costs.Understanding Builder AllowancesSeparate supply, installation, HST, delivery, markup, overage and unused-allowance credits.What Is an Allowance?A shorter explanation of why builders use allowances and how homeowners should compare them.The Real Cost of UpgradesCalculate the product difference, labour, waste, redesign, markup, HST and schedule effect.Construction Scope of WorkCreate a measurable scope tied to drawings, specifications, exclusions and responsibility boundaries.Fixed Price vs. Cost-PlusCompare price certainty, open-book records, contractor fees, contingency and owner risk.Price Escalation ClausesControl material-price increases with triggers, proof, caps, credits and owner choices.Product Substitution ClausesRequire technical comparison, owner approval, price credits and warranty protection.Unknown Site ConditionsAllocate rock, groundwater, buried material, unsuitable soil and concealed-condition risk.Owner-Supplied MaterialsAssign approval, purchasing, delivery, storage, installation, delay and warranty responsibility.
3. Deposits, invoices, draws, holdbacks and liens
Keep payments connected to real value, preserve prompt-payment rights and administer Ontario’s current holdback and lien rules.
Home Construction Draw ScheduleCoordinate lender advances, physical milestones, inspections, invoices and statutory holdback.Ontario Construction ActUnderstand the current prompt-payment, holdback, lien, trust and adjudication framework.Construction Liens in OntarioThe broader lien guide covering preservation, perfection, registered claims and owner response.Construction Deposits in OntarioDocument the deposit’s purpose, refund terms, early purchases and credit against the contract price.Ontario Construction HoldbackApply the 10% rule, mandatory annual release, finishing holdback and transition warnings.Can a Subcontractor Lien My Home?A homeowner-focused explanation of unpaid trades, holdback exposure and immediate steps.Final Payment and DeficienciesSeparate earned payment, statutory holdback, deficiency retention, set-off and closeout documents.Cost-Plus Invoices and RecordsRequire labour, supplier, subcontract, equipment, fee and credit records before paying.
4. Changes, schedules and project control
Control who can make decisions, how they are priced, which records prove approval and how time is added to the schedule.
Ontario Building Permit GuideUnderstand the drawings, approvals, responsibilities and municipal steps before construction.Construction Change OrdersUse one written process for scope, price, markup, credit, tax and completion-date effects.Verbal, Email and Text ChangesUnderstand when informal directions create disputes and how to confirm them immediately.Construction Delay ClausesAllocate owner, contractor, weather, permit, supply and force-majeure delays with notice rules.Substantial CompletionDistinguish statutory substantial performance from occupancy, final completion and deficiency closeout.Document Project CommunicationsBuild a project file for decisions, site meetings, changes, invoices, deficiencies and formal notices.
5. Cancellation, termination, abandonment and disputes
Use the correct legal route when work fails, the relationship breaks down or the parties need a neutral decision.
If the Builder Goes Out of BusinessProtect the site, deposits, warranties, lender requirements and insolvency claims.Cancel a Renovation ContractReview Ontario cooling-off rights, refunds, work started early and written cancellation notice.Construction Contract Termination ClausesControl default notices, cure periods, cause, convenience, final accounting and Form 8.Contractor Abandoned the ProjectFreeze the evidence, protect the building, value work in place and manage the replacement takeover.Construction Deficiencies and WarrantyDiagnose defects, preserve renovation and Tarion rights, verify repairs and manage final payment.Construction Dispute ResolutionChoose negotiation, mediation, adjudication, arbitration or court without missing live deadlines.
Why wording matters
Real contract problems are usually ordinary sentences
The expensive problem is rarely a clause titled “How We Will Surprise You.” It is a short sentence that leaves out the detail everyone assumed was understood.
“Excavation included”
Does that include rock, groundwater, excess-soil disposal, imported granular, compaction and winter conditions?
Ask for inclusions, exclusions and unit rates.“Kitchen allowance: $25,000”
Does that cover cabinets only, or also delivery, installation, hardware, counters, HST and builder markup?
Ask what the allowance actually buys.“Completion: approximately summer”
What starts the clock, what counts as completion, which delays extend it and what notice must be given?
Ask for a schedule process, not a hopeful date.“Equal or better substitutions permitted”
Who decides what is equal, must the owner approve it, and is there a credit if the replacement costs less?
Ask for written approval and comparison criteria.“Changes billed as extras”
Who can authorize them, what markup applies, are deletion credits fair, and must the price be known first?
Ask for one written change-order procedure.“Final payment at substantial completion”
Does this occur before occupancy, deficiencies, manuals, warranties, seasonal work or lien-risk procedures are finished?
Ask for exact final-payment conditions.Common questions
Ontario construction contracts in plain English
Does every Ontario construction contract have to be written?
Put every important term in writing. Ontario consumer law requires qualifying direct and future-performance agreements to contain prescribed information and be delivered to the consumer. Oral or informal agreements can still create legal issues, but they are much harder to prove and administer.
Is 10% the legal maximum construction deposit?
No universal 10% legal maximum applies to every construction contract. Ontario consumer guidance recommends keeping a renovation deposit to about 10%, but the proper amount depends on custom materials, mobilization, risk and the contract. The agreement should explain exactly what the deposit pays for and when it is refundable.
Should every payment wait until work is complete?
No. Deposits, custom orders and progress payments can be legitimate. The practical goal is to avoid paying materially ahead of verified work and documented material, while administering statutory holdback separately.
What is the Ontario construction holdback?
The Construction Act generally requires 10% holdback on the price of services or materials as they are actually supplied. Since January 1, 2026, basic holdback follows mandatory annual-release rules, with separate rules for finishing holdback and transition projects.
Can a verbal promise still matter?
It may. The practical rule is not that verbal promises are worthless; it is that any promise affecting scope, price, quality, product or timing should be written into the contract, specification or confirmed change record.
Can work proceed without a signed change order?
Sometimes parties authorize work through emails, texts, conduct or emergency directions. That is why the contract should require written approval of scope, price or pricing method and schedule effect before work begins whenever practical.
Does Tarion cover every custom home?
No. A covered contract home generally requires the builder to undertake all work and supply all materials needed for the completed home. Significant owner control or essential owner-supplied elements can affect statutory warranty eligibility.
Is the Contract Checker legal advice?
No. The Free Contract Scan and $99.99 builder-reviewed report identify construction scope, allowance, payment, scheduling and commercial risks. Legal interpretation, enforceability, lien strategy, cancellation and termination require an Ontario construction lawyer.
Reviewed July 30, 2026. This page provides general educational information, not legal, accounting, insurance or engineering advice. Ontario law, Tarion coverage, HCRA licensing and WSIB obligations depend on the project and can change. Have an Ontario construction lawyer review the actual agreement before signing, cancelling or terminating it.
The next step
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Hello,
A quick question I was hoping you can assist me with; if a contract between a home builder and customer is signed but does not contain any dates (i.e. start date, completion dates etc.) is it still a valid contract?
Thank you.
Would like a legal and binding contract for small construction in and around a house.
Exactly what I was looking for. Thank you for posting this!