Can I change the tenancy agreement after it starts?

Why it matters

Properly managing changes to a tenancy agreement is vital for landlords to maintain legal compliance and secure their rental income. Incorrectly implemented changes, such as those related to rent increases or tenancy terms, can render them unenforceable, potentially leading to significant financial losses if rent cannot be recovered or possession cannot be obtained. Furthermore, failing to adhere to legal requirements when varying an agreement can result in penalties, invalidate insurance, or complicate future legal proceedings, costing landlords time and money.

Legal requirements

• Any variation to a tenancy agreement must be agreed upon by all parties involved, including all named tenants and the landlord.
• The agreement to vary should be recorded in writing, clearly stating the original agreement and the specific clauses being amended.
• The written variation document must be signed by all parties to signify their consent.
• Landlords must ensure that any new terms introduced through a variation do not constitute a prohibited payment under the Tenant Fees Act 2019.
• Changes to fundamental terms, such as the rent amount, must still follow statutory notice periods and prescribed forms even if agreed.
• In England, landlords cannot vary an assured tenancy to include terms that would circumvent the protections offered by the Renters' Rights Act 2025.
• For joint tenancies, all named tenants must agree to any variation, and their signatures are usually required.
• The variation document should be dated clearly to establish the effective date of the changes.
• If the tenancy is registered with a scheme (e.g., in Scotland), some changes may require notification to the registration body.
• Landlords must provide tenants with a copy of the fully executed variation document for their records.

Common mistakes

• Attempting to make changes without the explicit written consent of all tenants.
• Assuming verbal agreements to changes are legally binding.
• Introducing new clauses that are discriminatory or unfair contract terms.
• Failing to clearly identify the original tenancy agreement and the specific clauses being varied in the amendment document.
• Using a variation document to impose prohibited fees on tenants.
• Not providing all parties with a signed copy of the varied agreement or amendment.
• Trying to change a periodic tenancy into a fixed-term agreement without the tenant's full understanding and consent.
• Failing to update relevant guarantor agreements when tenancy terms, particularly rent, are varied.

Practical guidance

• Discuss any proposed changes with your tenant(s) well in advance, explaining the reasons and implications.
• Draft a clear, concise variation document specifying the original tenancy agreement and the exact clauses to be changed.
• Ensure the variation document explicitly states that all other terms of the original agreement remain in force.
• Provide the draft variation document to the tenant(s) for review and allow them reasonable time to consider it.
• Obtain the signature of every named tenant and the landlord on the final variation document.
• Date the variation document and specify the effective date of the changes.
• Provide a fully signed and dated copy of the variation document to all tenants for their records.
• Store the variation document securely with the original tenancy agreement.
• If the changes impact rent, follow the specific statutory procedures for rent increases, even if the tenant agrees.
• Seek legal advice if the proposed changes are complex or contentious, or if you are unsure of their legality.

Understanding Mutual Consent and Formalities

The foundational principle for altering a tenancy agreement is mutual consent. Both the landlord and all named tenants must unequivocally agree to any proposed changes. This agreement should never be assumed or implied; it must be explicit. For legal enforceability, this consent must be recorded in writing. A properly drafted variation document should clearly identify the original tenancy agreement, precisely state which clauses are being amended or added, and confirm that all other terms of the original agreement remain unchanged. Signatures from all parties-landlord and every tenant-are essential, along with a clear date. This formal process protects both parties, providing a clear record of what was agreed and reducing the likelihood of future disputes or challenges to the tenancy terms.

Key Restrictions and Prohibited Payments

When varying a tenancy agreement, landlords must be acutely aware of legal restrictions, particularly those concerning prohibited payments. The Tenant Fees Act 2019 in England, for instance, strictly limits what payments a landlord or agent can demand from a tenant. Any clause introduced through a variation that requires a tenant to pay a fee not expressly permitted by this Act would be unlawful and unenforceable. Examples of prohibited payments include fees for drawing up a new agreement, inventory checks, or professional cleaning at the end of the tenancy beyond reasonable costs for damage. Landlords found to be charging prohibited fees can face significant fines. It is crucial to review any proposed new clauses against current fees legislation to ensure compliance. Similar, though not identical, rules exist in Scotland and Wales regarding fees, and landlords should consult the relevant legislation for these jurisdictions.

Rent Increases and Other Major Changes

While a tenancy agreement can be varied by mutual consent to increase rent, landlords in England must still adhere to specific statutory procedures, even if the tenant agrees. For an assured tenancy, rent can typically only be increased once every 12 months, and often requires serving a Section 13 notice if the tenant does not agree to a new rent. If a tenant does agree to a rent increase outside of the Section 13 process, it should still be documented clearly. Other significant changes, such as those impacting who resides in the property, property alterations, or the addition/removal of clauses relating to pets, also require careful documentation. Any changes to fundamental terms should be treated with the utmost formality to ensure they are legally sound and enforceable, preventing future challenges to the agreement's validity. Always consider the potential impact on guarantors; their consent may also be required if their obligations are affected by the changes.

Differences in Scotland, Wales, and Northern Ireland

The general principle of mutual consent for varying a tenancy agreement applies across the UK, but specific procedures and protections differ. In Scotland, most new tenancies are Private Residential Tenancies (PRTs), which offer greater security of tenure and different rules for rent increases and eviction (see also: /answers/scotland-rent-increase-rules and /answers/how-to-evict-a-tenant-in-scotland). While terms can be varied by written agreement, PRTs have a different legislative framework compared to assured tenancies in England. In Wales, specific Renting Homes (Wales) Act 2016 provisions apply, which came into force in December 2022, creating different contract types like 'standard contracts'. Changing terms in Wales must comply with this Act. Northern Ireland has its own distinct housing legislation. Landlords operating in these devolved nations must consult the specific legislation and guidance applicable to their jurisdiction, as relying on English law will likely lead to non-compliance and legal issues. (See also: /answers/what-is-a-private-residential-tenancy-scotland)