The courts typically take a strict approach to compliance with break conditions. The success of the estoppel argument in Sterling House Ltd v International Baccalaureate Organisation (UK) Ltd [2026] may therefore pave the way for similar arguments from other tenants who might previously have thought that all was lost.
Key takeaways
· When a lease contains a break clause, any break conditions must usually be strictly complied with.· Where annual rent is payable quarterly in advance, a break condition requiring payment of all rent ordinarily requires the tenant to pay the full quarter’s rent.
· However, in Sterling House, the landlord issued an invoice indicating that only rent up to the break date was payable and this prevented (estopped) it from arguing that the tenant had failed to satisfy the break condition.
· This decision may give other tenants greater scope to raise estoppel arguments where they may not have satisfied break conditions.
What is a break clause in a commercial lease?
A break clause gives the landlord, tenant or both the right to terminate a lease early, before the end of the fixed term.The lease might provide that the break right can be exercised on specific dates or at any time provided a minimum period of notice is given.
To exercise a break right, the party wishing to terminate the lease is usually required to serve a break notice. Typically, they will also need to satisfy certain break conditions either at the time the break notice is served or, more often, on or before the break date.
For example, a common break condition is that the tenant must have paid all the rent that had fallen due by the break date, and to have given up vacant possession, failing which the lease will not terminate.
Some break conditions can be more onerous, such as requiring the tenant to have complied or substantially complied with its repairing obligations, or to have paid all sums due under the lease, not just the principal rent. This might therefore include default interest where the rent has previously been paid late.
Historically, the courts have found that any conditions attached to a right to break a lease must be strictly complied with.
One particular trap is where the break clause requires the tenant to have paid all the rent and the break date falls part-way through a rent period. The courts have held that if rent is payable quarterly in advance the tenant must pay the full quarter’s rent, not just the rent apportioned up to the break date.
In addition, unless the lease expressly says so, having paid the full quarter’s rent the tenant would not be entitled to a refund for the sum that relates to the period after the break date.
What is estoppel?
There are some circumstances where the law considers that it would be unjust to allow one party to go back on a statement, promise or assurance they gave to another party. In these situations, the law will prevent (estop) that party from departing from that statement, promise or assurance.The main elements of estoppel are that A made a clear representation to B; B relied on that representation; and that it would be unconscionable for A to now resile from that representation.
What was the issue in Sterling House?
The tenant had a lease of commercial premises on the outskirts of Cardiff.Annual rent was payable in advance by four instalments on the usual quarter days in March, June, September and December.
As is common with modern commercial leases, the quarterly instalments were payable whether or not the landlord sent a formal rent demand. However, in this case it appears to have been the landlord’s usual practice to issue rent invoices anyway.
The tenant was also required to pay a contribution towards the cost of insurance but, unlike the annual rent, the insurance rent was only due if the landlord formally demanded it.
The lease contained a break clause giving the tenant the right to terminate the lease early. To be effective, the tenant was required to have paid all the annual rent that had fallen due by the break date as well as any insurance rent that had been demanded. If those sums were not paid, the break notice would be of no effect and the lease would continue.
The tenant served a break notice in June 2025 with the break date being 23 February 2026.
The tenant wrote to the landlord on 6 February 2026 to state that it was due to hand back the building later that month and asked the landlord to send an invoice for all rent and service charges that it was required to pay.
Having not received a reply, the tenant sent a chasing e-mail on 10 February 2026.
The landlord’s agent responded the same day, enclosing an invoice for the rent. Crucially, the rent invoice was for an amount calculated up to and including the break date on 23 February only, not for the full quarter (to 25 March).
The tenant paid the invoice on 13 February 2026.
On 20 February 2026 – the Friday before the break date the following Monday – the landlord sent the tenant a further invoice, this time for insurance rent also calculated up to and including the break date.
However, for a variety of reasons this did not come to the attention of the tenant’s facilities manager until 24 February, the morning after the break date. The invoice was paid by return the very same day.
The landlord argued that the tenant had not complied with the break conditions because it had not paid the rent for the whole of the December quarter, or the insurance rent, by the break date.
The High Court found that, by issuing an invoice for the rent only up to the break date, the landlord had clearly represented that that was the only sum the tenant had to pay before handing the premises back. The tenant had relied on that representation when it paid the invoice. As a result, the landlord was estopped from arguing that the tenant had failed to comply with the break condition that required payment of the full quarter’s rent.
As for insurance rent, the judge considered that the landlord had not given a reasonable time for the tenant to deal with the demand before the break date. The tenant was entitled to a reasonable opportunity to make the payment which, in this case, extended to the time when it in fact made the payment on 24 February 2026.
The judge dismissed the landlord’s claim, concluding that the tenant’s break notice had validly terminated the lease.
Why is the Sterling House case important to landlords and tenants?
The tenant arguably had a lucky escape in this case.The landlord did not need to serve a rent invoice at all. Had it not done so, and stayed silent when asked what amount the tenant should pay, the tenant would not have complied with the break clause if it had only paid a sum apportioned to the break date.
Indeed, there will be many acting for tenants who might say that, irrespective of this case, it may be safer, in an abundance of caution, to pay the full quarter’s rent even if the landlord serves an invoice showing an amount calculated only to the break date. It is not uncommon for landlords to set traps for tenants in this type of situation, and an invoice may not on its own always amount to a clear representation of the amount required to satisfy a break condition – it may turn on the surrounding facts and circumstances.
However, although the courts have historically required strict compliance with break conditions, this case - subject to the outcome of any appeal – opens the door a little further for tenants to raise estoppel arguments to try to avoid the consequences of non-compliance.
More generally, estoppel defences are sometimes seen as weak arguments deployed as a fallback of last resort. This case demonstrates that they can, with the right facts, be a powerful weapon in one’s armoury.
If you are looking to serve a break notice, seeking to understand what is required to satisfy any break conditions, or wish to assess the strength of any potential estoppel arguments, please get in touch with our specialist Commercial Property Litigation team.
