Estimate Your Freehold Purchase Premium
Use this calculator to estimate the likely premium for buying a freehold (or landlord interest) using a simplified enfranchisement model: Term Value + Reversion Value + Marriage Value.
What Is a Freehold Purchase?
A freehold purchase usually means buying out the landlord’s interest so that you gain long-term control over your property. In practical terms, this can reduce uncertainty around future lease terms, remove or reduce ground rent concerns, and improve saleability.
For leaseholders in the UK, freehold and lease extension valuations typically involve three main components:
- Term value: the present value of future ground rent the landlord would have received.
- Reversion value: the value today of getting the property back when the lease ends.
- Marriage value: the increase in total value when leaseholder and landlord interests are merged (often relevant below 80 years).
How This Freehold Purchase Calculator Works
1) Term Value
The calculator discounts annual ground rent using your capitalisation rate. A higher capitalisation rate generally produces a lower term value, because future rent is discounted more heavily.
2) Reversion Value
Reversion is estimated by discounting the current property value back over the remaining lease term using the deferment rate. Longer leases usually reduce this element because the reversion is further in the future.
3) Marriage Value (where applicable)
If the lease has less than 80 years remaining, the model estimates marriage value based on relativity. Relativity reflects how much a short lease is worth as a percentage of a comparable long-lease/freehold value. The model splits any uplift 50/50 as a simplified assumption.
Input Guide: Getting Better Estimates
Property value
Use a realistic current market value for the property on a long-lease basis. If uncertain, use local sold comparables and consider getting a broker or valuer opinion.
Ground rent
Enter your current annual ground rent. If your lease has aggressive rent escalation clauses, this simplified model may understate the term value, so treat outputs cautiously.
Years remaining
This is one of the most important variables. As lease length declines, premiums can rise quickly, especially when crossing below 80 years due to marriage value effects.
Rates and relativity
- Capitalisation rate: often a single-digit percentage, depending on market evidence and risk assumptions.
- Deferment rate: commonly modelled around accepted valuation practice, but case-specific.
- Relativity: if you know your valuer’s relativity assumption, enter it directly for a more tailored result.
Worked Example
Suppose a flat is worth £350,000 with £250 annual ground rent and 72 years left. Using a 7% capitalisation rate and 5% deferment rate, the model may show:
- A moderate term value from discounted rent,
- A meaningful reversion value, and
- Additional marriage value because the lease is under 80 years.
The final premium can then be adjusted by adding legal and valuation costs for a fuller budgeting figure.
What This Calculator Does Not Capture
Real enfranchisement calculations can include nuanced legal and valuation issues, for example:
- Complex ground rent review clauses,
- Act-specific assumptions and rights,
- Different treatment for houses vs flats,
- Negotiation outcomes and tribunal risk,
- Compensation for intermediate leasehold interests.
So while this calculator is a useful planning benchmark, it should not replace professional advice before making legal or financial decisions.
Practical Next Steps Before You Buy a Freehold
- Check lease details carefully, including review clauses and exact term remaining.
- Run several scenarios with conservative and optimistic assumptions.
- Get a specialist valuer to produce a formal calculation.
- Engage a solicitor experienced in leasehold enfranchisement.
- Budget for the premium, both sides’ reasonable costs (where applicable), and contingency.
Frequently Asked Questions
Is this calculator only for UK properties?
It is designed around UK-style enfranchisement concepts. Other jurisdictions use different legal frameworks, so adapt with caution.
Why does the premium jump below 80 years?
Because marriage value can apply, increasing the payable premium compared with a lease above 80 years.
Can I rely on this result for a legal claim?
No. Use it for initial budgeting only. Formal valuation evidence is essential for legal processes and negotiation.