Lease Extension Valuation: Ground Rent, Relativity and Premium
Understand why valuers disagree, and the evidence behind the premium for a lease extension.
Before choosing a professional: credentials to check
Before instructing a solicitor, verify the individual and firm in the Solicitors Regulation Authority (SRA) Register. For valuations, verify any claimed RICS membership or regulated firm status through RICS. A membership badge is not proof by itself.
If you receive an informal offer, compare the proposed term, premium, ground rent and professional charges with the statutory route. An initial quote should explain what remains uncertain.
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· England & Wales | October 2026
Understand why valuers disagree, and the evidence behind the premium for a lease extension.
Three broad elements of a statutory premium
The freeholder gives up expected ground-rent income and delays receipt of its reversionary interest. Depending on lease length, marriage value may add another element. Valuation is not a simple percentage of flat value; assumptions about time, market value and lease structure matter.
Ground rent patterns are not interchangeable
A fixed rent and an escalating or RPI-linked rent are different streams of future income. A valuer considers the actual clauses and dates rather than assuming a uniform annual amount. Double-check step changes and any review terms in the lease.
Relativity and market evidence
Relativity considers how leasehold value compares with a long-lease interest. Evidence may include local transactions, accepted graphs, valuation models and physical/property differences. Differences in evidence can reasonably produce different negotiations even without either valuer making a calculation error.
Marriage value and the 80-year boundary
Under currently operative rules, marriage value can arise for a lease at or below the relevant threshold at the statutory valuation date. A lease well above that threshold is not priced identically to a near-threshold lease. Prospective reform does not automatically displace the current formula.
How to challenge an estimate constructively
Ask for the comparable sales used, current ground rent assumptions, sensitivity to valuation rates and a realistic range. A reasoned second valuation may be worthwhile if a premium is material, but it can introduce additional costs and delay.
Practical checklist
- Read actual rent review clauses
- Ask for comparable transaction evidence
- Review sensitivity and relativity assumptions
- Compare statutory versus informal valuations
Common mistakes to avoid
A carefully documented decision is more useful than an assumption based on a search result. Check these risks before acting:
- Relying only on online valuations
- Ignoring escalating rent terms
- Presenting speculative reform savings as certain
Questions to ask a qualified specialist
- Which jurisdiction and legal procedure govern my situation, and why?
- What facts, supporting documents or valuation evidence are missing?
- What deadlines, professional fees and potential adverse costs must be planned for?
- What alternative approach should I compare before proceeding?
This guide is general information for England and Wales, not individual legal advice. Some provisions of the Leasehold and Freehold Reform Act 2024 are not yet in force. No attorney-client relationship is created and no solicitor or lawyer referral service is active on this site.
References and further reading
Use these sources to verify the law and published procedures at the date you act; official guidance can be updated.
- lease-advice.org — official or institutional guidance
- lease-advice.org — official or institutional guidance
- lease-advice.org — official or institutional guidance
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