Lease terms change either by statute or by negotiation. Statute is the lease extension route under the Leasehold Reform, Housing and Urban Development Act 1993. Negotiation is the deed of variation route, where freeholder and leaseholder agree to amend the lease document. The two are not interchangeable. This page explains when each is used, who initiates, what it costs, and how to decide between them.
A lease extension changes the term (the years remaining) and resets the ground rent to a peppercorn. A deed of variation changes the wording of one or more lease clauses. Different problems, different tools.
Adds 90 years to your existing term and reduces the ground rent to a peppercorn. Used when the remaining term is dropping and mortgage lenders are about to refuse the flat.
Changes specific clauses by mutual agreement. Used to fix a defective lease, remove an outdated restriction, change the apportionment, or add a missing right.
If your lease has fewer than 80 years remaining, an extension becomes urgent. Below 80 years, "marriage value" is added to the premium calculation, which can roughly double the cost. Above 80 years, the premium is much lower. The Leasehold and Freehold Reform Act 2024 has made changes to this regime; some provisions have commenced and others are still being implemented at the time of writing.
Step 1: Get a valuation. Engage a chartered surveyor (RICS-qualified, ideally an ALEP member) to value the premium. This is the single most important number. A surveyor's valuation typically costs £750 to £1,500. The valuation is your negotiating anchor with the freeholder.
Step 2: Serve the Section 42 notice. Through a property solicitor. The notice opens the formal statutory process. The proposed premium in the notice should be at the lower end of the valuer's range (you will negotiate up).
Step 3: Wait for the counter-notice. The freeholder has up to 2 months to respond with a counter-notice, typically with their own (higher) proposed premium.
Step 4: Negotiate or apply to the tribunal. Most extensions settle in negotiation. If the gap is too wide, either party can apply to the First-tier Tribunal (Property Chamber) to determine the premium. FTT decisions are public.
Step 5: Completion. The new lease (extended by 90 years, peppercorn ground rent) is granted, the premium is paid, the new lease is registered with HM Land Registry. See freehold-title.html for the registration step.
For a deeper walk-through with the cost calculator and Land Registry fee scale, see lease-extension.html.
If your remaining term is approaching 80 years, get the valuation done before the term drops below 80. Marriage value is added to the premium calculation when the term is below 80 years and can substantially increase the cost. The Leasehold and Freehold Reform Act 2024 received Royal Assent but its provisions are commencing in stages. At the time of writing (April 2026), the abolition of marriage value has not yet commenced for premium calculations. Verify current commencement status before acting; LEASE (lease-advice.org, free helpline 020 7832 2500) publishes the latest position, or instruct a specialist enfranchisement solicitor.
A deed of variation is a short legal document that changes one or more clauses of an existing lease. It is signed by both parties and registered with HM Land Registry. Common reasons to vary a lease include: fixing a typographical error, allowing pets, permitting subletting, changing the apportionment percentage, adding a right (e.g. to use a parking space), or removing an outdated restriction.
Step 1: Identify exactly what you want changed. The wording matters. "Permit pets with prior written consent" is different from "permit pets". A property solicitor (or LEASE-iQ for a first-pass review) can help you draft the proposed change.
Step 2: Approach the freeholder. Put the proposal in writing. Explain what you want changed and why. Ask them to provide a quote for their solicitor's costs in considering and (if agreed) drafting the deed.
Step 3: Negotiate. The freeholder may agree, refuse, or counter-propose different wording. If they refuse a reasonable variation, your options narrow: a Part IV LTA 1987 application is possible only for genuinely defective leases, not for changes you would prefer.
Step 4: Sign and register. Once both parties agree the wording, the deed is signed by both, witnessed, and registered with HM Land Registry. The original lease is not replaced; it is varied. Anyone reading the lease in future also needs to read the deed of variation alongside it.
If you are buying a flat, ask the seller's solicitor for any deeds of variation registered against the title. They are not always volunteered. A clause you read in the original lease may have been varied (or removed) by a deed registered later. Check both.
If your remaining term is short or your ground rent is escalating, the answer is a lease extension under the 1993 Act. If you want to change a specific clause and the freeholder is willing to negotiate, the answer is a deed of variation.
Use lease extension when: remaining term is dropping toward 80 years; mortgage lenders are starting to refuse; ground rent is escalating in a way that makes the flat unsellable; you want a peppercorn ground rent for the longer term.
Use deed of variation when: a specific clause is wrong or outdated; you need to add a right (parking, alterations, sublet); the freeholder is open to negotiation; the change is too narrow to justify the cost of a full statutory extension.
Use both, in sequence, when: a deed of variation now fixes an immediate problem (e.g. defective service charge clause), and a lease extension later resets the term and ground rent. The deed of variation does not extend the term; only the statutory route does.
All three start with checking what your lease currently says.
Cost estimator + Land Registry fee scale + step-by-step process for the s.42 statutory route.
Open the calculator →Upload your lease to LEASE-iQ and ask "What does my lease say about [the clause you want varied]?". First question free.
Upload my lease →For an extension valuation review or a deed of variation drafting brief, get a clause-cited written deliverable in 24 hours.
Talk to us →The Leasehold Advisory Service (LEASE) is the government-funded, independent body that provides free initial advice to leaseholders, RMC and RTM directors, and freeholders in England and Wales. They are the natural first call for anything statute-heavy.
The Building Trust assistant can route you to the right page, explain a clause, or get you started with LEASE-iQ. First question is free.
Want a written, clause-cited answer in 24 hours instead? Talk to us →