Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice.
Updated June 2026 · England & Wales
Commercial leases often need tweaking long after the ink has dried. Businesses grow, shrink, pivot, or sublet parts of their premises, and the original lease terms stop fitting the reality on the ground. Rather than tearing up the lease and starting again, landlords and tenants in England and Wales can use a deed of variation to formally change specific terms while leaving the rest of the agreement intact.
It is a practical, widely used tool, but it carries legal and tax consequences that are easy to underestimate. On this page I'll explain what a deed of variation does, when it makes sense to use one, the terms it typically changes, and the traps that catch people out.
If you're weighing up whether to vary your lease or accept a fresh one, the details below will help you think it through.
What this document is
A deed of variation is a standalone legal document that amends an existing commercial lease between a landlord and tenant. It sits alongside the original lease rather than replacing it, recording the specific clauses the parties have agreed to change and leaving everything else untouched.
Because a lease is itself a deed, any variation that alters its legal effect generally needs to be executed as a deed too, which means signed, witnessed, and delivered in the proper form. Common variations include changing the rent, adjusting the permitted use, altering the repair or insurance obligations, redrawing the demised area, or extending the term.
The document usually identifies the original lease by date and parties, sets out the background in short recitals, and then specifies the exact wording being added, removed, or replaced. Once signed, it becomes legally binding on both sides. One important point: a variation that extends the term or enlarges the premises can, in law, be treated as surrendering the old lease and granting a new one.
That can trigger Stamp Duty Land Tax, affect security of tenure under the Landlord and Tenant Act 1954, and disturb guarantors or subtenants. Getting the drafting right matters.
How to use this document
Identify what needs to change and why. Before drafting anything, both parties should be clear on which specific clauses need amending and the commercial reason behind it. A rent reduction during a difficult trading period, a change of permitted use, or an extension of the term all have different legal and tax implications, so the reason shapes how the variation should be structured. 2. Check the existing lease for restrictions. Many commercial leases contain provisions that affect how a variation can be made, particularly where there are guarantors, sureties, or a superior landlord. If the property is subject to a headlease or mortgage, consent from the superior landlord or lender is often required before any variation takes effect, and missing this step can render the variation ineffective. 3. Consider the tax and security of tenure consequences. Certain variations, especially those extending the term or increasing the extent of the premises, can be treated as a deemed surrender and regrant. This may create an SDLT liability and could strip the lease of its protection under the 1954 Act if the new arrangement is contracted out. Taking tax advice early avoids nasty surprises later. 4. Draft the deed accurately. The deed should clearly identify the original lease, recite the relevant background, and set out the varied terms in precise language. Vague drafting creates disputes down the line, so every amendment should specify which clause is being changed, what the new wording is, and the date the variation takes effect. Both parties should review the draft carefully. 5. Execute the deed correctly and retain records. The document must be signed as a deed by both landlord and tenant, with proper witnessing or, for companies, execution by two authorised signatories or a director in the presence of a witness. Keep the signed deed with the original lease, and notify any guarantors, subtenants, or lenders whose interests are affected.
It depends on how much you want to change. Small amendments, like tweaking the permitted use or adjusting a rent review clause, usually suit a deed of variation. If you're extending the term or significantly enlarging the premises, a new lease is often cleaner because the law may treat a major variation as a deemed surrender and regrant anyway, which can bring unexpected tax and security of tenure consequences.
Q Does a deed of variation need to be registered at HM Land Registry?
If the original lease is registered at HM Land Registry, variations that affect the registered details, such as a change to the term or the extent of the demised premises, generally need to be noted or registered. Variations that only change personal obligations between the parties often don't require registration, but it's worth checking the Land Registry guidance for your specific situation.
Q Can a landlord refuse to agree to a variation?
Yes. A deed of variation is a voluntary agreement between the parties, so neither side can force the other to sign. A landlord may refuse outright, or agree only on certain conditions such as a premium, a revised rent, or additional security. If the lease itself contains a mechanism for adjusting specific terms, that process may apply instead of a free-standing variation.
Q What happens to guarantors when a lease is varied?
This is a crucial point. Under established case law, a variation that increases a guarantor's liability without their consent can release the guarantor entirely from their obligations. Any variation affecting rent, term, or tenant obligations should normally be signed by the guarantor too, either as a party to the deed or through a separate consent, so the guarantee continues to bite.
Q Does SDLT apply to a deed of variation?
It can. Variations that extend the term, increase the rent, or enlarge the premises may trigger Stamp Duty Land Tax because HMRC can treat them as creating a new chargeable transaction. Changes that simply clarify obligations or reduce rent generally don't attract SDLT. The rules are detailed, so check the current HMRC guidance or take specialist tax advice before signing.
Q Can a deed of variation change security of tenure under the 1954 Act?
A variation alone usually can't strip out 1954 Act protection from an existing lease. However, if the variation is substantial enough to be treated as a surrender and regrant, the new notional lease could be contracted out of the Act using the statutory procedure. This is why the distinction between a true variation and a deemed new lease matters so much.
Q How long does it take to put a deed of variation in place?
A straightforward variation, agreed in principle between cooperative parties, can often be drafted and signed within a few weeks. More complex changes, especially those needing superior landlord consent, lender approval, or tax advice, can take considerably longer. Building in time for guarantors and other interested parties to sign also tends to extend the timeline.
Varying a commercial lease sounds simple, but the knock-on effects for tax, guarantors, and security of tenure can catch people out. An experienced legal adviser can talk through your circumstances on the phone and help you think about whether a deed of variation or a fresh lease makes more sense based on what you describe.
✓Plain-English answers to your specific questions about varying the lease
✓Practical perspective on whether a variation or new lease fits your situation
✓What to watch out for around guarantors, SDLT, and 1954 Act protection
✓Clarity on your next steps based on what you describe on the call
Personal call · For information only · Independent advisers
Written & reviewed by
Brad Askew Solicitor (non-practising)
Brad is on the roll of solicitors of England & Wales but does not hold a practising certificate and does not provide legal advice. LegalDocuments.co.uk is not a law firm and does not provide regulated legal advice.
This article is for general information only. It is a tool to help you find your way — not legal advice, and not a substitute for speaking to a qualified adviser about your situation.
