“It’s in the contract” ends a lot of conversations that shouldn’t actually be over. A signed tenancy agreement is genuinely important, but that single fact hides three separate questions that are too often collapsed into one: was the term validly part of the agreement in the first place, has it subsequently been changed through a process that amounts to a real variation, and — even where it clearly is part of the agreement — is it the kind of term the law will actually enforce?
Those distinctions matter more in England after the 2026 tenancy reforms because some important parts of the landlord-and-tenant relationship are now controlled directly by statute rather than left entirely to contractual wording. A landlord cannot simply rewrite the agreement to avoid those rules, and some changes, particularly rent increases, now have their own legal mechanism regardless of what an old tenancy agreement says.
This article focuses on private assured tenancies in England. Consumer-contract principles have wider UK relevance, but Wales, Scotland and Northern Ireland operate different underlying tenancy frameworks and should not be treated as though England’s post-May-2026 rules simply transfer across.
A proposal to change something is not the same as a change
As a general rule, a landlord cannot rewrite an ordinary contractual term simply by announcing that something different will apply from next month. If an agent emails to say overnight guests are now prohibited, the landlord posts a new set of “house rules” through the door or a verbal instruction is given during an inspection, the first question is not whether the new rule sounds reasonable. It is whether it has actually become part of the tenancy.
In most cases, changing an existing contractual term requires agreement between landlord and tenant. A unilateral announcement is therefore usually a proposal rather than a completed variation. Not every agreed change requires an entirely new tenancy agreement or elaborate formalities, but relying on an informal conversation or on the parties’ later conduct can create an argument about what was actually accepted. Recording the final wording clearly in writing is considerably safer for both sides.
Conduct can still matter. If landlord and tenant plainly proceed for some time on the basis of an agreed alteration, that behaviour may become evidence of what was accepted. What it does not do is give the landlord a general right to send out new conditions and treat silence, continued occupation or ordinary payment of rent as automatic consent to whatever has been proposed. If you receive a change you do not agree with, saying so in writing removes much of that ambiguity.
There is a different situation where the tenant asks for the contract to be changed. Adding or replacing a tenant, for example, may require a formal variation, assignment or novation. Under the Tenant Fees Act regime, a landlord or agent can charge up to £50 for a variation requested by the tenant, or more where they can demonstrate that their reasonable costs were genuinely higher. The relevant permitted-payment rule is set out in Schedule 1 to the Tenant Fees Act 2019. That does not allow a landlord to invent a “variation fee” when the change is something they themselves are trying to impose.
Some changes sit outside ordinary contractual variation altogether because legislation supplies the mechanism. The 2026 tenancy reforms themselves changed the legal status of existing assured shorthold tenancies without every landlord and tenant signing a replacement agreement. Rent is another important example. For assured periodic tenancies in England, a landlord wanting to increase the rent now has to use the statutory section 13 process, normally through Form 4A, give the required notice and comply with the restrictions on frequency. The current government guidance on rent increases explains that post-2026 system.
So before asking whether a landlord has “changed the tenancy”, it is worth establishing what kind of change is actually being attempted. An agreed contractual variation, a statutory rent increase and a change imposed directly by legislation may all alter what happens in the tenancy, but they do so for different legal reasons.
Statutory rights sit above the contract, whatever it says
A tenancy agreement operates inside the law rather than instead of it. Some obligations are imposed by statute and cannot simply be transferred or removed because the agreement contains wording pointing in the opposite direction.
The landlord’s repairing obligations are a longstanding example. Section 11 of the Landlord and Tenant Act 1985 places responsibility for specified repairs and installations on the landlord for the tenancies to which it applies, while section 12 restricts attempts to contract out of those duties. A clause saying that the tenant must take responsibility for structural repairs does not automatically move a statutory landlord obligation merely because both parties signed the agreement. The relevant restriction on contracting out is built into the Act itself.
The 2026 pet regime provides a more recent example, although its effect needs to be stated carefully. The new law does not simply erase every “no pets” clause or give tenants an unconditional right to bring an animal into the property. Instead, it implies a statutory process into the tenancy: the tenant can make a written request, and the landlord must not refuse consent unreasonably. An older contractual clause saying “no pets” therefore cannot be used as though it ends the question automatically.
Other post-2026 rules work in the same broad way. An agreement cannot turn an assured periodic tenancy into a genuine fixed term merely because an old document still contains a fixed end date, and a contractual rent-review clause cannot provide a shortcut around the statutory rent-increase regime where that regime now applies.
This is why identifying the source of a right matters. Where the protection exists because Parliament has imposed it, the tenancy agreement generally has to operate around that protection rather than draft it away.
A clause can be part of the agreement and still be unfair
Specific housing legislation is not the end of the analysis. Private tenancy terms can also fall within consumer-protection law where the landlord or agent is acting as a trader, and Part 2 of the Consumer Rights Act 2015 gives courts a separate basis for scrutinising unfair contractual terms. The Competition and Markets Authority’s current unfair-contract-terms guidance, updated in July 2026, explains how those principles apply across consumer contracts.
The legal test is more precise than simply asking whether the tenant dislikes the clause. Broadly, a term can be unfair where, contrary to the requirement of good faith, it creates a significant imbalance between the parties’ rights and obligations to the consumer’s detriment. That assessment looks at the contract as a whole, the nature of what is being supplied and the circumstances in which the term was agreed.
Transparency is important too, but it is not exactly the same test. Written consumer terms are supposed to be expressed in plain and intelligible language and be legible, while ambiguous wording is generally interpreted in the way most favourable to the consumer. A clause does not become fair merely because it has been drafted clearly, just as difficult wording is not the only reason a term can fail.
There is also an important limit to the fairness assessment itself. Terms defining the main subject matter of the contract, or assessing the adequacy of the price compared with what is supplied, are generally outside the ordinary fairness test where they are both transparent and prominent. For a tenant, that means the Consumer Rights Act is not simply a route for arguing that the rent is too high because the figure feels unfair. Rent in England now has its own statutory increase and challenge machinery, which is usually the more relevant route.
Outside that core area, one-sided contractual powers deserve particularly close scrutiny. A clause allowing a landlord unrestricted freedom to change the tenancy whenever they choose is the obvious example. So too are provisions that seek to remove responsibility regardless of fault, impose disproportionate consequences for relatively minor breaches or give the landlord sweeping rights without a corresponding justification.
If a term is found to be unfair, the consequence is not normally that the entire tenancy collapses. The unfair term is not binding on the consumer, while the rest of the agreement continues so far as it can sensibly do so. The tenant can also choose to rely on an unfair term where they wish, because the protection exists to prevent the trader enforcing unfair wording against the consumer rather than to erase the clause for every purpose.
That is the reason a signature is not the final answer. Signing is strong evidence that you entered into the tenancy agreement. It does not convert something prohibited by statute or unfair under consumer law into an enforceable obligation.
Working through a real example
Imagine that six months into the tenancy the managing agent emails to say that overnight guests are now prohibited and that every visitor must be notified 48 hours in advance.
The first issue is whether this new rule has ever become part of the tenancy. If it is simply an instruction you have not agreed to, calling the email “updated tenancy terms” does not itself make the change contractual. Before debating whether the restriction is fair, the landlord may first have to establish that there was a valid variation at all.
If the term genuinely was agreed, the next question is whether another rule of law controls the subject regardless of agreement. With ordinary guests there is no direct equivalent of the statutory pet-request regime, so there is no simple provision saying that every guest restriction is automatically void. Other rights can still matter in particular cases, including discrimination law, but the analysis does not stop at a single statutory right to have visitors.
That leaves the nature of the restriction itself. A landlord may have legitimate reasons for controlling who actually occupies the property. A visitor is not the same thing as somebody effectively moving in, unauthorised subletting or occupancy that creates licensing, safety or overcrowding problems. A tenancy term aimed proportionately at those risks is not automatically unfair simply because it limits what the tenant can do.
A blanket prohibition on every overnight guest regardless of frequency or circumstances raises a different question. If it goes materially beyond what is reasonably needed to protect a legitimate landlord interest and interferes heavily with the tenant’s ordinary private use of their home, there may be grounds for challenging the term under consumer law.
The reliable way through the problem is therefore not to jump straight to “can my landlord ban guests?” It is to ask whether the restriction was actually agreed, whether some statutory rule controls or overrides it and, only then, whether the term itself can be enforced. Those are three different questions, and starting with the last one can mean spending time arguing about the fairness of wording that never became part of the tenancy in the first place.
What to actually do with a term you’re unsure about
Start with the exact wording rather than the landlord’s summary of it. “Guests aren’t allowed” may turn out to be a clause about additional occupiers or subletting rather than ordinary visitors. Likewise, if an agent says the agreement has been changed, ask to see the original provision, the replacement wording and the basis on which they say you agreed to it.
Then work through the same distinction that runs through the rest of the article: is this genuinely part of the agreement, is there a statutory rule that changes the answer regardless of the contract, and is the term enforceable even if it was validly agreed? Putting those questions in writing can be particularly useful because it requires the landlord or agent to identify the legal and contractual basis for the position they are taking rather than simply repeating that the clause exists.
For an individual dispute about unfair terms, obtaining advice is generally more useful than expecting a regulator to rule on your tenancy for you. Citizens Advice can advise on consumer and housing rights and can pass appropriate consumer-law intelligence to Trading Standards. The CMA also receives reports about wider consumer problems and has significant enforcement powers, but it does not step in to advise on or decide individual contractual disputes. Its current consumer guidance explains that distinction.
Ultimately, whether a disputed clause is unfair can be a matter for a court, while regulators may act more broadly against businesses using unlawful or unfair terms across their contracts. Those are different functions, and reporting a practice to an enforcement body does not automatically produce an immediate decision about whether you personally have to comply with a particular clause.
The practical point is simpler. Do not assume a term is enforceable merely because it appears in a professionally drafted agreement, and do not assume a new instruction has become part of your tenancy merely because the landlord has announced it. Equally, do not simply ignore wording you think is invalid and assume the problem has disappeared. Establish what was agreed, what the law says and what consequence the landlord is actually threatening to attach to it.
“It’s in the contract” is evidence that the conversation needs to start with the contract.
It is not proof that the conversation is over.
This article provides general property information, not legal, financial, surveying or other professional advice for your individual circumstances. Property disputes and regulatory issues can depend on the facts, documents, location and applicable law. If significant money, property or legal rights are at risk, or you are considering an irreversible course of action, take appropriate professional advice before proceeding.
