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England · Lease Extension · LRA 1993 · Section 42 · Marriage Value · Leasehold Reform Act 2024

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

Lease extension UK 2026: statutory right under Leasehold Reform Act 1993, Section 42 notice process, premium valuation including marriage value, Leasehold and Freehold Reform Act 2024 changes, mortgage implications of short leases, and BTL landlord practical steps.

11 min readUpdated 6 June 2026Last reviewed: 17 May 2026lease-extensionleaseholdsection-42marriage-value

Statutory right to extend — who qualifies

  • Currently: must own the flat for at least 2 years before serving Section 42 notice (runs from Land Registry registration date)
  • LFR Act 2024: removes the 2-year ownership requirement — once commenced, buyers can serve notice immediately after purchase
  • Lease length: statutory right applies regardless of unexpired term — but premium is higher for shorter leases
  • Exclusions: commercial leases, charitable housing trust landlords, certain pre-April 1990 converted buildings

Section 42 notice — the statutory process

  • S.42 Initial Notice: served on freeholder specifying proposed premium, proposed terms (90-year extension, peppercorn ground rent), and response date (minimum 2 months)
  • S.45 Counter-notice: freeholder must respond within specified period — admit right + propose terms, or deny right (rare)
  • Negotiation period: typically 6 months to agree premium; unresolved cases go to First-tier Tribunal (Property Chamber) for binding determination
  • Valuation frozen at notice date: serving notice early locks in the valuation — important in rising markets or post-refurbishment
  • Specialist solicitor essential: incorrect service (wrong format, wrong address) invalidates the notice — use a specialist leasehold solicitor

Extension premium — valuation

  • Component 1 — ground rent capitalisation: present value of lost ground rent income (small for peppercorn/low rents)
  • Component 2 — reversion value (relativity): freeholder's right to property at lease expiry — less valuable where unexpired term is long
  • Component 3 — marriage value (leases below 80 years): freeholder entitled to 50% of uplift in value from extension — largest cost for short leases; abolished by LFR Act 2024 once commenced
  • Indicative costs (pre-abolition): 90 years remaining on £300k flat ~£5,000-£12,000; 79 years ~£15,000-£30,000; 60 years ~£40,000-£80,000

Mortgage implications of short leases

Extend before 80 years — not after

Below 80 years: marriage value raises the premium sharply. Below 70 years: most mainstream BTL lenders will not lend. Below 60 years: virtually no mainstream lender will lend at all. Act early.

  • Most BTL lenders: minimum 70-85 years unexpired AT END of mortgage term — check individual lender requirements
  • Short lease resale: restricted buyer pool (cash buyers, landlords prepared to extend immediately) — depresses resale value
  • Section 42 notice on sale: landlord can serve notice pre-marketing and assign benefit to buyer — buyer continues extension at notice date valuation

Leasehold and Freehold Reform Act 2024

  • Marriage value abolished: leaseholders below 80 years no longer pay 50% freeholder share — substantially cheaper extensions
  • 2-year ownership requirement removed: buyers can serve Section 42 notice immediately after purchase
  • Non-residential limit: increased from 25% to 50% — more mixed-use buildings eligible for collective enfranchisement
  • Prescribed relativity tables: to be introduced by statutory instrument — standardises calculation and reduces tribunal disputes
  • Commencement timetable: key provisions require commencement orders — confirm current position with specialist leasehold solicitor

Frequently asked questions

When should I extend the lease on my buy-to-let flat?+

Extend before the lease drops below 80 years — ideally at 85-90 years remaining. Below 80 years, marriage value kicks in and the premium increases sharply. Below 70 years, mainstream BTL mortgages become unavailable. Monitor lease lengths across your portfolio and initiate extensions well before these thresholds.

Does marriage value still apply in 2026?+

The Leasehold and Freehold Reform Act 2024 abolishes marriage value, but the provision must be commenced before it takes effect. Confirm the current commencement position with a specialist leasehold solicitor. If commenced, it applies to all new Section 42 notices served after commencement — substantially reducing extension premiums for leases below 80 years.

Templates recommended in this guide

Found a gap or disagree with something?

Reply to any LetSafe email or write to Richard@letsafeuk.co.uk. We rewrite guides when we get something wrong, the sooner we hear, the sooner we fix it.

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