How to Start Reading a Commercial Lease in Canada

A commercial lease's headline rent is rarely the whole rent. The quoted figure is usually base rent, stated per square foot per year, and the costs beyond it — common-area maintenance, property taxes, insurance, utilities, fit-out, and renewal terms — are where a small business's occupancy cost is actually decided. This guide reads a commercial lease the way a tenant should: from the total cost, through each charge, to the clauses that decide what happens when the term ends or a payment is missed. It is process information, not legal advice: commercial leases are contracts, and the lease you sign can change most of the defaults described here. Ontario's own page states that plainly — a signed commercial lease agreement may take precedence over the Commercial Tenancies Act, according to Government of Ontario, Renting commercial property in Ontario. Where a figure or term was not verified on an opened source, this guide states a check instead of a figure.

1. Start from the total, not the headline rate

Compare leases on total monthly occupancy cost: base rent plus additional rent plus tax, plus any separately billed utilities, parking, or storage. The Business Development Bank of Canada describes incidental expenses as the tenant's costs on top of base rent, including property tax, insurance, utilities, maintenance, common area costs, and repairs, according to Business Development Bank of Canada, 13 commercial leasing terms you need to know. A lower base rent with a wide additional-rent list can cost more than a higher base rent with a narrow one, and a gross lease with one all-in figure cannot be compared with a net lease's base figure at all until the net lease's additional rent is priced. Ask every landlord for the same three numbers before comparing: the base rent per square foot, the additional rent per square foot as estimated for the current year, and the prior year's actual additional rent per square foot. The gap between estimate and actual is the number that tells you how honest the estimate is.

Ontario's page lists the clauses most commercial leases should cover: the rent amount including rules for rent increases and notice requirements, the deposit amount, insurance requirements, repair and maintenance obligations, rules about how to renew or end the lease, the length and type of tenancy, and other negotiated business details, according to Government of Ontario, Renting commercial property in Ontario. Use that list as a completeness check on any draft: a lease missing the deposit clause, the repair clause, or the renewal clause is not a shorter lease, it is an unfinished one.

2. Gross, net, and triple-net: read the cost list, not the label

The labels describe who pays building costs, and the Business Development Bank of Canada's definitions are the cleanest starting point. In a gross rent lease you pay a single amount covering base rent and all incidental expenses. In a modified gross lease you and the landlord share some combination of incidental costs. In a single net lease you typically pay base rent plus one incidental expense, most commonly property taxes. In a double net lease you pay base rent plus property taxes and insurance. In a triple net lease you usually pay base rent, plus property taxes, building insurance and utilities, as well as other operating and maintenance costs, while the landlord assumes no costs other than structural repairs, according to Business Development Bank of Canada, 13 commercial leasing terms you need to know. The Bank's negotiating guide repeats the warning that matters most: while these definitions are standard, landlords sometimes add maintenance or common area expenses to a single or double net lease, so always double-check what you must pay for, according to Business Development Bank of Canada, 12 tips for negotiating a commercial lease.

The discipline that follows is simple. Never accept a label as the cost list. For each lease, write out the categories the tenant pays — taxes, insurance, utilities, common-area maintenance, management fees, repairs, replacements, capital work — and mark each one as tenant, landlord, or shared, from the lease's own words. Two leases both called triple-net can differ on management fees, capital replacements, and structural repair boundaries, and those three lines are where the label hides real money. If a category is not named in the lease, ask for it to be named, in either column, before signing: an unnamed cost is a future dispute, not a saving.

3. CAM and additional rent: the estimate, the share, and the true-up

Common area maintenance, or CAM, is the tenant's share of maintaining the parts of the building all tenants use: lobbies, corridors, elevators, parking areas, landscaping, snow removal, and common-area lighting and heating. In most net leases CAM is billed as part of additional rent, alongside the tax share and the insurance share, and Ontario listings commonly quote the package as TMI — taxes, maintenance, and insurance — per square foot on top of net rent. The Commercial Tenancies Act does not use the term TMI and does not say what it must include, so a TMI figure is only meaningful once the lease's cost list behind it is open.

Three mechanics decide what additional rent actually costs. First, the share: your proportion of building costs is normally set by your share of the building's leasable area, so confirm the denominator — the building's total leasable area — and whether vacant space is included in it, because a denominator that shrinks when space sits empty pushes your share up. Second, the billing: additional rent is usually billed monthly on an estimate, so confirm the estimate, the month it starts, and whether it resets during the term. Third, the reconciliation: after the year closes, the landlord totals actual building costs and either bills the shortfall or credits the overpayment, so confirm the reconciliation deadline, the statement you will receive, and whether you have a right to inspect the underlying accounts and a deadline to dispute them. A lease with no audit or dispute clause leaves you paying the landlord's statement without a route to challenge it. Ask for the prior year's reconciliation statement before signing: it shows both the real cost level and whether the landlord's estimates run hot or cold.

4. Rent increases, term length, and the exit

Ontario's page states the governing fact for increases: the Commercial Tenancies Act does not regulate rent increases, and commercial tenancy agreements should specify the amount of rent charged and the frequency of rent increases, according to Government of Ontario, Renting commercial property in Ontario. Check the increase mechanism in the lease itself: fixed annual steps, an index-linked escalation, a market-rent reset at renewal, or a combination. Each behaves differently in a bad year, and a market-rent reset at renewal is an increase clause in disguise — confirm how market rent is determined, who determines it, and whether arbitration or appraisal applies if you disagree.

Term and exit are governed the same way: by the lease, not by a statute. Ontario's page states that in a month-to-month tenancy either side must give written notice at least one month in advance, with the last day of the tenancy the last day of the month, while a fixed-term lease needs no notice to end — the tenant must be out on the date in the lease — and a fixed-term tenant who wants to end early must pay the rent for the remaining term unless a clause allows an early end, according to Government of Ontario, Renting commercial property in Ontario. The same page adds the cost of overstaying a fixed term after being asked to leave: a penalty of two months' rent for every month the tenant remains, plus applicable costs, and the landlord may also apply to the Superior Court of Justice for a writ of possession, on the same page. Before signing, confirm the term, the expiry date, the early-exit clause if any, and the holdover clause: a lease with no early-exit clause is a commitment to the full term's rent, and a lease with a punitive holdover clause punishes a slow move-out, not just a refusal to leave.

5. Fit-out and tenant improvements: who pays, who owns, who restores

Ontario's page names the fit-out question directly: if you need to renovate a commercial space for a restaurant, make sure the lease outlines who will pay for the improvements, according to Government of Ontario, Renting commercial property in Ontario. The Business Development Bank of Canada lists tenant improvement allowance and leasehold improvements among the terms to understand before signing, according to Business Development Bank of Canada, 13 commercial leasing terms you need to know. Four questions settle the fit-out section. First, the allowance: does the landlord contribute a fixed amount per square foot, and does it cover hard construction only or also design, permits, and fees. Second, overruns: who pays costs above the allowance, and what happens to unspent allowance. Third, ownership: do the improvements belong to the tenant during the term and pass to the landlord at the end, or stay the tenant's to remove. Fourth, restoration: must you return the space to its original condition, to a base-building condition, or as-is, and does that obligation cover every improvement or only named ones. A restoration clause that requires full reinstatement can cost more than the original fit-out, and it is routinely signed unread. Price it before signing, not at move-out.

6. Percentage rent: the retail clause that follows your sales

In a percentage rent lease you pay a base rent plus a percentage of your gross sales over a certain minimum, and these leases are usually used in malls and other multi-tenant retail locations, according to Business Development Bank of Canada, 12 tips for negotiating a commercial lease. If your lease carries percentage rent, five definitions decide what you pay: what counts as gross sales, what is excluded from it, the minimum threshold above which the percentage applies, the percentage itself, and the reporting and audit cycle. Confirm whether online sales shipped from the store, gift-card redemptions, and returns count, and whether the landlord may audit your sales records and what that audit costs if it finds nothing. A percentage clause with an undefined gross-sales term gives the landlord a claim on revenue your business may not treat as store sales at all. If you are not in a mall or multi-tenant retail centre, a percentage clause in your draft is worth questioning outright: it is a retail-centre mechanism, and its presence in an office or industrial lease usually means a template was copied, not a term negotiated.

7. Renewal, assignment, and sublease

Renewal, assignment, and sublease are three separate rights, and a lease can grant one while closing another. Ontario's page states that tenants can sublet or assign the lease unless it is prohibited by the lease, according to Government of Ontario, Renting commercial property in Ontario. Read the prohibition clause first: a flat ban on assignment ends the conversation, while a consent requirement opens the question of what standard the landlord must meet. The Business Development Bank of Canada's negotiating guide names the practical reason to care: if sales decline or you want a bigger space, some leases require you to pay all or part of the remaining rent to break them, while subleasing the whole space could allow a move without a heavy termination penalty, according to Business Development Bank of Canada, 12 tips for negotiating a commercial lease. Confirm the renewal option's notice window, its rent-setting mechanism, and whether it survives an assignment; confirm whether a subtenant gains any renewal right of its own; and confirm whether the original tenant stays liable after an assignment or is released.

Quebec sets statutory floors under these clauses. Commercial leases in Quebec are governed by the Civil Code of Québec, articles 1851 to 1891, and most of those provisions apply only by default, meaning only if the lease itself does not exclude or modify them, according to Silaws, Commercial Lease Guide for SMEs. Within that framework, a tenant may assign the lease or sublet with the landlord's consent, the landlord cannot withhold consent without a serious reason, and the landlord has 15 days to respond, after which consent is presumed, on the same page. The same page states that a commercial tenant has no automatic right to renewal and receives no eviction indemnity if the landlord simply declines to renew, and that renewal happens only through an express option clause or a fresh agreement, on the same page. The assignment-sublease distinction matters in Quebec as elsewhere: on assignment the new tenant steps into the lease, while on a sublease the original tenant remains bound to the landlord. Read the lease's consent clause against the Code's serious-reason and 15-day rules, and do not assume a lease clause that purports to erase them is effective without legal advice.

8. Default and dispute: what the lease can change, and what it cannot ignore

For a breach other than unpaid rent, Ontario's page states that the landlord must give the tenant notice of the breach and a reasonable period of time to remedy the breach, and that if the tenant does not remedy it, the landlord may change the locks, according to Government of Ontario, Renting commercial property in Ontario. For unpaid rent the page gives the landlord the two-option choice described in the FAQ: change the locks on the 16th day after the due date, or seize and sell the tenant's property through distress, but not both, on the same page. A lease can modify these defaults — Ontario's page warns that a signed lease may take precedence over the Act — so the default clause in the lease is the clause that decides a live dispute, and the statute is the fallback when the lease is silent. Read both together before signing, and note the dispute forum while you are calm: disputes about money or personal property under $50,000 can go to Small Claims Court, while larger claims go to the Superior Court of Justice, and the province does not get involved in commercial landlord and tenant disagreements, according to Government of Ontario, Renting commercial property in Ontario.

British Columbia's route is different in form: the Commercial Tenancy Act provides a court process for a landlord to recover possession, with strict compliance required and relief from forfeiture potentially available to the tenant, according to Lexology, Commercial evictions in British Columbia: a primer on the Commercial Tenancy Act. The contrast is the point for a tenant reading a lease anywhere in Canada: Ontario's statute gives the landlord self-help remedies with statutory conditions, British Columbia's routes the landlord through the courts, and Quebec's Code sets consent and cure rules of its own. No single province's default story travels. Confirm which province's law governs your lease, read that province's default clause, and get legal advice on a live default rather than testing the clause yourself.

9. Before you sign: the reading checklist

Total cost. Base rent, additional rent estimate, prior-year actual additional rent, tax treatment, separately billed utilities, parking, and storage — all in one monthly total, compared across leases on the same basis.

Cost list. Every building-cost category marked tenant, landlord, or shared, from the lease's own words. Management fees, capital replacements, and structural repair boundaries named explicitly.

Additional rent mechanics. The share denominator, the estimate and its reset dates, the reconciliation deadline, the statement you receive, and your right and deadline to inspect accounts and dispute the statement.

Term and increases. Term length, expiry date, increase mechanism, renewal option with its notice window and rent-setting mechanism, early-exit clause or its absence, and the holdover clause.

Fit-out. Allowance amount and scope, overrun responsibility, unspent allowance, ownership of improvements, and the restoration obligation priced before signing.

Use and alteration. Permitted use, exclusivity if any, alteration consent, signage rights, and the assignment and sublease clause with its consent standard and post-assignment liability.

Default and forum. The default clause read against the province's statute, the notice and cure provisions, the dispute forum, and the deposit amount, conditions for its return, and any conditions for forfeiting it.

Insurance and repair. Insurance requirements, repair and maintenance obligations split between landlord and tenant, and responsibility for building systems, roof, structure, and heating and cooling equipment.

Figures this guide does not state

This guide states no rent per square foot, no TMI or CAM rate, no management-fee percentage, no fit-out allowance amount, no percentage-rent rate or threshold, no deposit amount, and no tax rate, because none of those figures is set by any source opened for it: each is set by the individual lease or the individual building. The only figures stated are the ones verified on opened sources: Ontario's 16th-day lock-change rule, five-day distress hold, two-appraiser requirement, one-month month-to-month notice, two months' rent per month holdover penalty, and $50,000 Small Claims Court threshold, and Quebec's 15-day assignment and sublease consent window and 10-day tacit-renewal trigger. Each is labelled with its province, and none is presented as a national rule. For every other number in a lease, read the lease, the quote, and the reconciliation statement for the building in front of you.

Related guides

• GST/HST on Rental and Commercial Property in Canada — the tax treatment of commercial rentals, including which supplies are taxable and which are exempt, and the change-of-use rules that can create a self-supply.
• How to Avoid Hidden Fees on Event Tickets in Canada — the same drip-pricing discipline applied to ticket prices, including the Quebec advertised-price rule.
• How to Start Understanding Card Payment Costs for a Small Business in Canada — the fees a small business pays to accept card payments, a separate occupancy-adjacent cost from the lease charges in this guide.

Sources

• Government of Ontario, Renting commercial property in Ontario — the Commercial Tenancies Act's relationship to a signed lease, the lease contents list, month-to-month and fixed-term endings, breach notice and cure, the 16th-day lock change, distress versus eviction, the five-day hold and two-appraiser rule, the absence of rent-increase and maintenance regulation, and the Small Claims and Superior Court forums
• Business Development Bank of Canada, 13 commercial leasing terms you need to know — incidental expenses, gross, modified gross, single net, double net, and triple net definitions, and the tenant improvement allowance and leasehold improvements terms
• Business Development Bank of Canada, 12 tips for negotiating a commercial lease — the warning that landlords sometimes add maintenance or common-area expenses to single or double net leases, the percentage rent lease description, and the break-lease and sublease negotiation points
• Silaws, Commercial Lease Guide for SMEs — Quebec Civil Code articles 1851 to 1891 as default rules, the 15-day assignment and sublease consent rule with serious-reason standard, the 10-day tacit renewal rule, the absence of an automatic commercial renewal right, and the absence of commercial rent control
• 2727 Coworking, Analysis of Quebec Commercial Leases and Sub-Leases — the assignment versus sublease distinction in Quebec, including release of the original tenant on assignment and continued liability on sublease
• Lexology, Commercial evictions in British Columbia: a primer on the Commercial Tenancy Act — British Columbia's court-based possession route, its strict compliance requirement, and relief from forfeiture
• Government of British Columbia, Commercial Tenancy Act — the statute behind British Columbia's commercial tenancy possession and distress provisions