Commercial leases · 9 min read

Notice periods for commercial leases: break clauses and renewal deadlines

By Alex Renner · 18 October 2026

A commercial lease usually ends in one of two ways. It runs to its expiry and is renewed, or a break clause ends it early on an agreed date. Both routes carry a notice requirement, and both are governed by the wording of the lease rather than by a general rule. The dates are easy to record once found. The difficulty is that they sit in different clauses, use different units and may be conditional on other obligations.

A break clause is a right, not a date

A break clause gives one or both parties the option to end the lease early on a specified break date. The notice period is the mechanics: how much warning must be given before that date. The break date is the event; the notice deadline is the last day on which the option can still be exercised. Confusing the two is the most common error, because the break date is the one written in the lease summary and the notice deadline is the one that requires arithmetic.

A renewal is a different mechanism. The lease may contain an option to renew on stated terms, or the law in the relevant jurisdiction may give the tenant a right to request a new lease. Either way, the route and the deadline come from the document and the local rules, not from the break clause. Read them separately.

Where the dates live

Search the lease for the defined term, the break clause and any renewal option. The relevant dates are usually in four places:

• The definition of the term, which fixes the expiry date.
• The break clause, which fixes the break date, the notice period and any conditions.
• The renewal clause or option, which may have its own notice period and deadline.
• Any side letter or deed of variation, which can move a date or add a condition without changing the main body.

Check the order of precedence. A side letter that varies the term or the break date may override the printed lease, and a schedule may contain a different notice address from the one in the body. Record the source document for every date so the next reader can verify it.

Counting months, not days

Lease notice periods are often written in calendar months rather than days, and the distinction matters. Six calendar months before 30 September 2027 is 30 March 2027. One hundred and eighty days before the same date is 3 April 2027. Both are described as roughly six months in conversation; only one matches the clause.

The counting rule sits beside the unit. Some leases exclude the day of service, some exclude the expiry date, and some count business days. A date computed with the wrong rule can be a day or two out, which is exactly the margin that decides whether a break was valid. Where the clause is silent, treat the computed date as provisional and have the wording read by someone qualified to interpret it.

Conditions attached to a break

A break clause is often conditional. The right to break may depend on the rent being paid up to date, on there being no material breach, on the premises being returned in a stated condition, or on a particular form of notice being served on a particular party. A notice that is correct in form but does not satisfy the conditions may not end the lease.

Service is part of the condition. Many leases prescribe written notice, sometimes by registered post or courier, and some require receipt by a date rather than dispatch by a date. If receipt is required, work backwards through the delivery time and record the last safe dispatch date. Keep evidence of what was sent, when and to whom.

This is general information rather than legal advice. A conditional break is the point at which a mistake is expensive, so have the clause and the proposed notice checked by someone qualified in the relevant jurisdiction.

Renewal deadlines

A renewal deadline is not the same as a break deadline, even when both appear in the same lease. A renewal option may require notice months before the expiry, and the notice may need to be in a prescribed form. Where the law gives a tenant a statutory renewal right, the procedure and the deadlines come from that law and may differ from anything written in the lease.

Track the renewal decision separately from the break decision. The first asks whether you want to stay; the second asks whether you want to leave early. They can fall in the same year, and a team that tracks only one will eventually miss the other.

A lease tracking routine

A lease tracker needs five fields per date: the date, its source document, the notice period as written, the permitted method of service and the owner responsible. Add a sixth field for any condition attached to the right.

• Record the term end, every break date and any renewal deadline.
• Store the notice period in its written unit and never convert months to days.
• Note the service method and whether receipt is required.
• Set an internal decision deadline earlier than the notice deadline by the time approvals actually take.
• Keep the served notice and the acknowledgement with the contract record.

The arithmetic for a single date is the same as for any other contract: the free notice-period calculator subtracts days or calendar months and returns the rule it applied. The tracking flow shows how NoticeAhead stores the dates, the owner and the reminders. For the wider picture across contract types, the guide on notice deadlines by contract type is a useful companion.

Common questions

Last checked: 2026-10-18 · Reviewed by the NoticeAhead editorial team · Not legal advice