Lease Addendum (Canada)

A Lease Addendum in Canada is a legally binding written instrument. It records the rental price, deposit, term, maintenance duties, and notice periods between landlord and tenant.

Lease addenda in Canada must comply with provincial residential tenancy legislation, which varies significantly across jurisdictions. In Ontario, the Residential Tenancies Act 2006 (S.O. 2006, c. 17) mandates use of the Ontario Standard Lease for most residential tenancies under Section 12, and any addendum terms that conflict with the Act are void. Section 3 of that Act states that any waiver or agreement to waive a right, benefit, or protection under the Act is void. The Ontario Landlord and Tenant Board — which adjudicates under Section 168 and Section 174 — has consistently ruled that tenants cannot be bound by addendum terms that exceed what the Act permits.

In British Columbia, the Residential Tenancy Act 2002 (S.B.C. 2002, c. 78) governs addenda under Section 13, which permits additional terms provided they do not conflict with the Act or Residential Tenancy Regulation. Section 18 of that Act permits a pet damage deposit of up to one-half month's rent. Alberta's Residential Tenancies Act 2004 (S.A. 2004, c. R-17.1) governs addenda through Section 15, permitting supplementary terms as long as they meet statutory minimums. Manitoba's Residential Tenancies Act (C.C.S.M. c. R119) Section 8 and Saskatchewan's Residential Tenancies Act 2006 (S.S. 2006, c. R-22.0001) Section 7 each impose distinct requirements. Quebec lease modifications must comply with Civil Code of Quebec Articles 1895–1900 and be approved by the Tribunal administratif du logement under Section 28 of Act 2019 (CQLR, c. T-15.01).

The addendum becomes a legally binding part of the original lease once signed by both parties. The forms-legal.com Lease Addendum template explicitly references the original lease by date, address, and parties, and includes a survival clause confirming all unmodified terms remain in full force. The Canada Revenue Agency administers GST/HST on commercial lease modifications under Section 165 of the Excise Tax Act (R.S.C. 1985, c. E-15). Section 216 of the Income Tax Act (R.S.C. 1985, c. 1 (5th Supp.)) applies to non-resident landlords collecting Canadian rent.

A Lease Addendum is distinct from a lease renewal agreement and a lease assignment agreement — a renewal extends the term, an assignment transfers the tenancy to a new tenant, while an addendum modifies specific terms of the existing tenancy without changing the parties or the term. For commercial tenancies, addenda must also comply with the applicable provincial commercial tenancy legislation. In Ontario, the Commercial Tenancies Act (R.S.O. 1990, c. L.7) Section 23 governs assignment and subletting, while Section 19 governs forfeiture. The Personal Information Protection and Electronic Documents Act (S.C. 2000, c. 5) applies when addenda involve collection of tenant personal information — landlords must have a lawful basis under Section 7 of that Act for disclosing tenant information to third parties such as property management companies. The Strata Property Act (S.B.C. 1998, c. 43) Section 141 imposes additional obligations on BC strata landlords when modifying tenancy terms in strata units.

A Lease Addendum (Canada) is needed when a tenant requests permission to keep a pet and the original lease did not address pet policies. In Ontario, Section 14 of the Residential Tenancies Act 2006 renders no-pet clauses void, but in Alberta and BC, landlords may add pet restrictions or pet damage deposits — Section 18 of BC's Residential Tenancy Act 2002 permits a pet damage deposit of up to one-half month's rent.

An addendum is needed when the landlord and tenant agree to change the rent amount, payment method, or schedule mid-tenancy. In Ontario, Section 116 and Section 120 of the Residential Tenancies Act 2006 govern permissible rent increases, and above-guideline increases require an application under Section 126.

Adding a new occupant or roommate to the lease requires a signed addendum establishing additional occupancy terms, liability allocation, and any adjustments to rent or utility responsibilities. Section 134 of the Residential Tenancies Act 2006 prohibits charging additional fees not authorized by the Act — an addendum cannot circumvent this by labelling new charges as administrative fees.

When assigning parking spaces, storage lockers, or amenities not in the original lease, a separate addendum documents fees, maintenance obligations, and liability. For commercial leases, addenda addressing assignment of parking are governed by provincial commercial tenancy legislation such as Ontario's Commercial Tenancies Act (R.S.O. 1990, c. L.7) Section 23.

Without a signed addendum, verbal modifications are difficult to enforce. Section 9 of the Residential Tenancies Act 2006 requires additional terms to be in writing. The Ontario Landlord and Tenant Board, British Columbia Residential Tenancy Branch, and Alberta Residential Tenancy Dispute Resolution Service all require written evidence of agreed modifications. Non-resident landlords must comply with Section 216 of the Income Tax Act (R.S.C. 1985, c. 1 (5th Supp.)) withholding requirements, and a documented addendum supports accurate reporting.

A Lease Addendum is also needed when a landlord permits a home-based business or subletting. Section 97 of Ontario's Residential Tenancies Act 2006 requires written landlord consent for subletting. Section 13 of British Columbia's Residential Tenancy Act 2002 requires written authorization for any subletting or assignment. The Strata Property Act (S.B.C. 1998, c. 43) Section 141 imposes additional obligations on BC strata landlords modifying tenancy terms in strata units.

A complete Lease Addendum (Canada) contains several elements required to modify a lease effectively under Canadian law.

Reference to Original Lease — The addendum must identify the original lease by date, property address, and names of all parties. Section 12 of Ontario's Residential Tenancies Act 2006 requires that additional terms be attached to or form part of the lease agreement.

Specific Modifications — Each change must be stated clearly and precisely. Section 3 of the Residential Tenancies Act 2006 voids any waiver of rights — ambiguous addendum terms that could be read as waiving statutory rights are unenforceable. The Ontario Landlord and Tenant Board requires clear written evidence of modified terms.

Compliance with Provincial Tenancy Law — Any terms conflicting with the applicable provincial tenancy act are void. Section 4 of Ontario's Residential Tenancies Act 2006 establishes this hierarchy. Section 13 of British Columbia's Residential Tenancy Act 2002 permits additional terms that do not conflict with the Act. Section 15 of Alberta's Residential Tenancies Act 2004 similarly allows supplementary terms.

Pet Policy Terms — If adding a pet clause, specify the type and number of pets allowed, any pet damage deposit permitted under Section 18 of British Columbia's Residential Tenancy Act 2002, and the tenant's liability for pet-caused damage under Section 34 of Ontario's Residential Tenancies Act 2006.

Rent and Financial Terms — If modifying rent, confirm compliance with Section 120 of Ontario's Residential Tenancies Act 2006 (rent increase guideline) and Section 126 for above-guideline increases. Additional charges such as parking must not violate Section 134, which prohibits unauthorized fees.

Mutual Consent and Signatures — Both parties must sign and date the addendum. Section 9 of Ontario's Residential Tenancies Act 2006 requires additional terms in writing. Corporate signatories must have authority under Section 146 of the Canada Business Corporations Act (R.S.C. 1985, c. C-44).

Effective Date — State when the addendum takes effect. Section 37 of Ontario's Residential Tenancies Act 2006 governs the effective date of tenancy terminations; a parallel principle applies to addenda.

Survival of Original Terms — A clause confirming all unmodified lease terms remain in force. The forms-legal.com Lease Addendum template includes this standard survival clause.

Dispute Resolution — Reference to the appropriate body: the Ontario Landlord and Tenant Board under Section 168 of the Residential Tenancies Act 2006; the British Columbia Civil Resolution Tribunal under Section 12 of Act 2012 (S.B.C. 2012, c. 25); the Alberta Residential Tenancy Dispute Resolution Service; or the Quebec Tribunal administratif du logement. The Personal Information Protection and Electronic Documents Act (S.C. 2000, c. 5) — enforced by the Office of the Privacy Commissioner of Canada under Section 12 of that Act — governs collection of tenant personal information in the addendum process.

Related documents to consider alongside a Lease Addendum include a Lease Extension Agreement (to extend the tenancy term), a Sublease Agreement (if the tenant is subletting to another occupant), and a Room Rental Agreement — all available at forms-legal.com. For commercial tenancies, a Commercial Lease Agreement and a Lease Assignment Agreement address related needs under provincial commercial tenancy legislation. Section 98 of Ontario's Residential Tenancies Act 2006 sets out the procedure for landlord consent to assignment.