Lease Extension UK 2026 — Landlord Guide for Leasehold Buy-to-Let

The statutory right to extend — who qualifies

The right to extend a lease under the Leasehold Reform, Housing and Urban Development Act 1993:

• 2-year ownership requirement (currently): Under the current law, a leaseholder must have owned the flat for at least 2 years before they can serve a Section 42 notice to extend the lease. The 2-year period runs from the date of registration at Land Registry, not from the exchange of contracts
• Leasehold and Freehold Reform Act 2024 — removal of 2-year rule: The LFR Act 2024 removes the 2-year ownership requirement. Once this provision is commenced (expected 2025-2026), a leaseholder can serve a Section 42 notice immediately after purchase — allowing buyers to initiate the extension process as soon as they complete. As of June 2026, the commencement date for this specific provision should be confirmed with a specialist leasehold solicitor
• Lease length: The statutory right applies to any unexpired lease, regardless of its original term. A flat with 30 years remaining on the lease is as entitled to a statutory extension as one with 80 years remaining — though the extension premium will be significantly higher for the shorter lease
• Exclusions: The statutory right does not apply to: commercial leases; leases where the landlord is a charitable housing trust; leases of houses (which have separate rights under the Leasehold Reform Act 1967); or leases where the flat is in a building that is converted from a non-residential use and was owned by the freeholder on 1 April 1990
• Company-owned flats: A company that owns a flat can exercise the statutory right to extend — the 2-year ownership period applies to the company as the legal owner

Section 42 notice — the statutory process

The lease extension process begins with a formal Section 42 notice:

• Section 42 notice: The leaseholder serves a Section 42 notice (Initial Notice) on the freeholder specifying: the proposed premium for the extended lease; the proposed terms of the new lease (principally: 90-year extension beyond unexpired term, peppercorn ground rent); and a date by which the freeholder must respond (at least 2 months)
• Freeholder's counter-notice (Section 45): The freeholder must respond within the period specified in the Section 42 notice (minimum 2 months) with a Section 45 counter-notice. The counter-notice must either: (a) admit the right to extend and propose alternative terms (typically a higher premium); or (b) deny the right to extend (rare — only where the leaseholder is genuinely ineligible)
• Negotiation period: After service of the counter-notice, the parties have a period (typically 6 months) to negotiate the premium. If no agreement is reached, either party can apply to the First-tier Tribunal (Property Chamber) to determine the premium. The FTT's determination is binding
• Specialist solicitor essential: The Section 42 notice must be served correctly — incorrect service (wrong address, wrong format, wrong dates) can make the notice invalid and force a restart of the process. A specialist leasehold solicitor should draft and serve the notice. Many solicitors advise on a 'no move, no fee' basis for statutory lease extensions
• Valuation at notice date: The extension premium is calculated based on the lease and property values at the date of the Section 42 notice, not at completion. Serving the notice early 'freezes' the valuation date — important if property values are rising or if the landlord has recently carried out works that increased value

Extension premium — how it is calculated

The statutory extension premium has three components:

• Component 1 — ground rent capitalisation: The present value of the lost ground rent payments (the freeholder's income stream lost because the extended lease has a peppercorn ground rent). This component is relatively small — particularly for leases where ground rent is already peppercorn or low. For older leases with high or escalating ground rents, this component can be significant
• Component 2 — reversion value (relativity): The freeholder's interest in the property at the end of the current lease — their right to the property when the lease expires. The longer the unexpired term, the less valuable this reversion (the freeholder gets the property back sooner on a short lease). Calculated using relativity tables and RICS guidance
• Component 3 — marriage value (leases under 80 years): When a lease drops below 80 years, the freeholder is legally entitled to 50% of the 'marriage value' — the uplift in value created by the extended lease. This is the largest component for short leases and can make extensions of very short leases (below 60 years) extremely expensive
• Leasehold and Freehold Reform Act 2024 — marriage value abolished: The LFR Act 2024 abolishes marriage value for lease extensions. Once this provision is commenced (the commencement timetable should be confirmed), leaseholders with leases below 80 years will no longer need to pay the 50% marriage value share to the freeholder. This is the most significant financial change from the 2024 reforms — it will substantially reduce extension premiums for short leases
• Indicative cost examples (pre-LFR Act 2024 abolition): A flat worth £300,000 with 79 years remaining — typical extension premium £15,000-£30,000 (the marriage value significantly increases cost just below 80 years). A flat worth £300,000 with 90 years remaining — typical premium £5,000-£12,000. A flat worth £300,000 with 60 years remaining — typical premium £40,000-£80,000 (marriage value dominates)

Mortgage implications of short leases

Lease length directly affects buy-to-let mortgage availability:

• Lender minimum lease requirements: Most BTL mortgage lenders require a minimum unexpired lease term at the end of the mortgage term. The most common requirement is 70-85 years remaining at the end of the mortgage term (e.g., for a 25-year mortgage today, the lease must have at least 95-110 years remaining now). Each lender's requirements differ — check with a broker
• Short lease = mortgage difficulty: A flat with 70 years or less remaining is difficult to finance with a mainstream BTL mortgage. Many lenders will not lend on leases below 70 years. Below 60 years, virtually no mainstream lender will lend. A landlord with a short-lease flat in their portfolio may face a refusal on refinancing — a significant risk
• Resale implications: A buyer's solicitor will advise on lease length, and most buyers require mortgage finance. A flat with a short lease (below 80 years) has a significantly restricted buyer pool — cash buyers or landlords prepared to extend immediately. This depresses the resale value relative to an equivalent flat with a long lease
• Extend before the lease hits 80 years: The most important practical rule for BTL landlords is to extend the lease before it drops below 80 years. Below 80 years, marriage value kicks in and the premium increases sharply. Landlords should monitor lease lengths across their portfolio and initiate extensions with at least 85-90 years remaining to preserve mortgage eligibility and avoid the marriage value threshold
• Lease extension on sale: A landlord who is selling a flat with a short lease can serve a Section 42 notice before marketing and then assign the benefit of the notice to the buyer on completion. This allows the buyer to continue the extension process at the notice date valuation, rather than restarting from scratch. Some buyers specifically look for short-lease properties with a notice in place as a buying opportunity

Leasehold and Freehold Reform Act 2024 — key changes for landlords

The LFR Act 2024 makes the most significant changes to leasehold law in decades:

• Marriage value abolished: Once commenced, the marriage value component of the lease extension premium is abolished. Leaseholders with leases below 80 years will no longer pay the 50% marriage value share — making extensions of short leases substantially cheaper
• 2-year ownership requirement removed: Buyers can serve a Section 42 notice immediately after purchase — allowing a buyer to agree the lease extension as a condition of purchase or to initiate the process immediately on completion
• Peppercorn ground rent on extension: Already the position under the 1993 Act — the extended lease carries a peppercorn (zero) ground rent. The LFR Act 2024 confirms and extends this principle
• Non-residential limit increased: The non-residential limit (the proportion of the building that can be non-residential before collective enfranchisement is excluded) was increased from 25% to 50% — more mixed-use buildings become eligible for collective enfranchisement and lease extension
• Commencement timetable: The LFR Act 2024 received Royal Assent on 24 May 2024. Provisions are being commenced in stages. The key provisions (marriage value abolition, 2-year ownership removal) require commencement orders — consult a specialist leasehold solicitor for the current position. Some provisions may not be in force until 2025 or 2026
• Relativity tables and premium calculation: The government is also implementing prescribed relativity tables under the LFR Act 2024, which will standardise the relativity calculation and reduce disputes. These are expected to be prescribed via statutory instrument

Frequently asked questions