You may have a commercial lease in front of you, but the paperwork uses residential tenancy language. Or perhaps the premises include both a shop and living accommodation. This can make it difficult to know which tenancy rules apply.
The distinction matters because residential assured tenancies and commercial business tenancies follow different legal rules. The rights around occupation, renewal and ending the tenancy can also be very different.
There is another complication. Since 1 May 2026, assured shorthold tenancies have been abolished in England. Most existing ASTs became assured periodic tenancies, while new qualifying private residential tenancies use the assured periodic system.
This article explains how commercial and assured tenancies differ, where mixed-use premises can create questions, and what important court decisions tell us.
It will also help you understand what to check before relying on the title written at the top of your agreement.
In This Article
Why a commercial lease and an assured tenancy are different
The starting point is how the premises are occupied. A commercial lease usually concerns premises occupied for business purposes. Examples include a shop, office, warehouse, café or salon. Business tenancies can fall within Part II of the Landlord and Tenant Act 1954. Where the Act applies, a qualifying business tenant may receive security of tenure.
That can mean the tenancy continues after the contractual expiry date until it ends through the correct legal process. The tenant may also have a right to request a new tenancy. Residential assured tenancies sit under a different legal framework.
They concern premises occupied as a person’s home and are governed principally by the Housing Act 1988, as amended. Since 1 May 2026, the private rented sector in England has also changed significantly. Existing ASTs generally became assured periodic tenancies. New qualifying private tenancies are now granted on that periodic basis.
So if you operate your business from commercial premises, do not assume residential tenancy rules apply. Likewise, residential wording in a document does not automatically answer the question. The actual arrangement needs to be considered.
Why calling an agreement an AST does not settle its legal status
One problem arises when the parties rely on the heading of the document. A landlord might call an arrangement a licence. Another agreement might describe itself as a commercial lease or, historically, an assured shorthold tenancy.
The wording matters, but it does not always settle the legal status. A major authority on this issue is Street v Mountford [1985] UKHL 4. The House of Lords considered whether an occupation described as a licence was legally a tenancy.
The case established an important principle. If the legal characteristics of a tenancy are present, the parties cannot necessarily change that position simply by using a different label. Exclusive possession was a particularly important factor in that decision.
For a business owner, the practical lesson is simple.
Do not rely only on what the agreement calls itself.
You need to consider:
- what premises are being occupied
- how those premises are being used
- whether the occupier has exclusive possession
- what the agreement actually allows
- which statutory tenancy regime applies
This becomes particularly important where business and residential occupation overlap.
What changed to assured shorthold tenancies in 2026?
If an old lease or website refers to an assured shorthold tenancy, check the date before relying on that information. From 1 May 2026, the Renters’ Rights Act reforms changed the private residential tenancy system in England. Most existing assured shorthold tenancies became assured periodic tenancies automatically.
New qualifying private residential tenancies are also assured periodic tenancies. They no longer use the old fixed-term AST structure. The reforms also removed section 21 “no fault” possession procedures for these tenancies. This does not turn commercial leases into assured tenancies.
Commercial business occupation continues to require its own legal analysis. It does mean that older references to an “AST” may now be outdated when you are assessing a current residential arrangement in England.
If the agreement involves business premises, the first question should therefore not be:
“Is this an AST?”
A better question is:
What type of tenancy does this occupation legally create?
That requires looking at the premises, the occupation and the agreement together.
Why mixed-use premises can cause problems
The position can become less obvious when the same property is used for both business and residential purposes. For example, imagine a person operates a convenience store on the ground floor and lives in accommodation above it. There may be one agreement covering the whole building.
Alternatively, separate parts of the property may be held under different arrangements. You cannot safely determine the legal position from the fact that somebody sleeps at the property. You also cannot safely assume the whole arrangement is commercial because a business operates downstairs.
The facts matter.
Questions may include:
- Which parts of the premises does the agreement cover?
- What was the property let for?
- Which part is occupied for business?
- Which part is occupied as a home?
- Is there one tenancy or more than one arrangement?
- Does one use dominate the arrangement?
- What does the agreement say about permitted use?
These questions can affect which statutory regime applies.
For business tenants, the Landlord and Tenant Act 1954 may also become relevant. Onyx’s guide to security of tenure in a commercial lease explains how qualifying business tenancies can receive renewal rights.
Read Onyx’s guide to security of tenure in a commercial lease
Mixed-use occupation is therefore an area where relying on a template or document heading can create problems.
What do the main case precedents tell us?
Court decisions can help explain how tenancy status is assessed. They should not be treated as a substitute for checking the facts of your own arrangement.
Street v Mountford
In Street v Mountford [1985] UKHL 4, the House of Lords considered the distinction between a tenancy and a licence. The decision is important because it shows that the court looks beyond the title given to an agreement. Where an occupier has exclusive possession for a term at a rent, that can strongly indicate a tenancy, subject to exceptions.
The parties cannot necessarily avoid tenancy rights simply by describing the arrangement as a licence. For business owners, this matters when an occupation document does not appear to match what happens in practice. The substance of the arrangement deserves attention.
Uratemp Ventures Ltd v Collins
Uratemp Ventures Ltd v Collins [2001] UKHL 43 dealt with the meaning of a dwelling-house under the Housing Act 1988. The occupier lived in a single room in a hotel.
The House of Lords held that a single room could amount to a dwelling-house. It did not need conventional cooking facilities to qualify on that basis.
This decision matters because the idea of a “dwelling” does not depend solely on the size or conventional layout of the premises.
How the premises are actually used can be important. For mixed commercial and residential premises, cases like this show why factual details matter. A shop with accommodation above it cannot always be classified by looking at one word in the agreement.
Why getting the tenancy type wrong matters
Misunderstanding the legal status of a tenancy can affect important decisions.
You may misunderstand your renewal rights
A qualifying business tenant may have security of tenure under the Landlord and Tenant Act 1954. However, a commercial lease can also be contracted out of those protections before it begins. If that has happened correctly, the tenant may have no statutory right to remain after expiry.
Onyx explains the difference in its guide to commercial lease security of tenure.
You may follow the wrong procedure when the tenancy ends
Residential and commercial tenancies do not use the same termination process. If you assume the wrong legal regime applies, you may use the wrong notice or misunderstand what happens after expiry.
That can create delay and uncertainty.
You may misunderstand what happens when the lease expires
A business tenant can sometimes remain in occupation after the contractual lease term ends. What happens next depends on whether the Landlord and Tenant Act 1954 applies and how the lease was granted.
Remaining in possession does not automatically create the outcome either party wants. If your commercial lease has already expired, the legal basis of continued occupation should be checked.
You may negotiate the wrong terms
Tenancy status affects more than possession.
A commercial lease may deal with:
- rent reviews
- service charges
- repairs
- alterations
- permitted use
- assignment
- break clauses
- renewal
- reinstatement obligations
These are business commitments.
Using a residential document for a genuinely commercial occupation may therefore leave important commercial issues unaddressed.
What should you check before signing?
If you are being offered a commercial lease, mixed-use tenancy or occupation agreement, start with the actual arrangement.
Check how the premises will be used
Be specific. Will you run a business there? Will anyone also live there? If so, which part will they occupy? The legal analysis may change where business and residential use overlap.
Check what the agreement actually covers
Do not rely only on its title. Look at the property description, permitted use, term, rent and occupation rights. Check whether the agreement gives exclusive possession.
Check whether the Landlord and Tenant Act 1954 applies
A qualifying business tenancy may receive security of tenure. However, the landlord and tenant can sometimes agree to exclude those rights before the tenancy is granted.
If you have received a warning notice or declaration about sections 24 to 28 of the 1954 Act, understand it before signing. The declaration should not be treated as routine paperwork.
See Onyx’s explanation of commercial lease security of tenure
Check outdated AST wording
If the document refers to an assured shorthold tenancy in England, check when it was created and why that wording appears. ASTs were abolished from 1 May 2026 for the private rented sector in England.
That does not automatically make an older agreement invalid. It does mean that its current legal status may need checking against the new framework.
Ask what happens when the agreement ends
You should know whether you have renewal rights and what notice may be required. For commercial leases, also check whether the tenancy has been contracted out of the 1954 Act.
Understanding the end position before signing can prevent difficult decisions later.
Frequently asked questions
Can a commercial lease be an assured tenancy?
A normal tenancy of premises occupied for business purposes is governed differently from a residential assured tenancy. However, mixed residential and commercial occupation can require closer analysis. The agreement, use of the premises and circumstances all matter.
Is an assured shorthold tenancy still valid in 2026?
The AST regime changed in England on 1 May 2026. Most existing ASTs became assured periodic tenancies automatically. New qualifying private rented tenancies are generally assured periodic tenancies.
Can I use an AST agreement for a shop?
You should not assume a residential tenancy agreement is suitable for commercial premises. A shop lease can involve business-specific rights and responsibilities that a residential agreement may not address. Get the proposed agreement checked before signing.
Does living above my shop make the whole lease residential?
Not necessarily. Mixed-use arrangements depend on the premises, agreement and actual occupation. Where part is used as a business and another part as a home, legal advice may be needed to establish the tenancy status.
What case says the name of the agreement does not decide whether it is a tenancy?
Street v Mountford [1985] UKHL 4 is the leading authority commonly associated with this principle. The House of Lords looked at the substance of the arrangement and the occupier’s exclusive possession.
Can one room count as a dwelling?
It can. In Uratemp Ventures Ltd v Collins [2001] UKHL 43, the House of Lords held that a single room could qualify as a dwelling-house under the Housing Act 1988.
Does every commercial tenant have security of tenure?
No. The Landlord and Tenant Act 1954 does not protect every business tenancy.
Some arrangements fall outside the Act, while qualifying tenancies can also be properly contracted out before the lease begins.
Check what your commercial lease actually creates
A commercial lease and an assured residential tenancy are not interchangeable. The difficulty often comes when the paperwork uses the wrong terminology or the premises have both business and residential use.
Court decisions such as Street v Mountford also show why the document’s label does not always settle the legal position. Since the residential tenancy rules changed in May 2026, relying on older AST terminology creates another reason to check the agreement carefully.
Before you sign, understand how the premises can be used, which tenancy regime applies and what rights you have when the agreement ends.
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