Model a lease-extension premium under the pre-commencement method, including term, reversion and marriage value where the model applies it. Compare a separate 2024 Act scenario. No sign-up; not a formal valuation or statement of current law.
Guess the value high and the premium rises; guess it low and you may under-budget. PropertyPredator can show nearby HM Land Registry sold-price evidence and matched floor-area context where available, so you can test whether the deal still works after an estimated extension cost.
The calculator's pre-commencement model adds marriage value below 80 years. The 2024 Act provides for that element to be removed, but commencement and technical rules are time-sensitive. Check the current official position and take specialist advice.
It uses stated deferment, capitalisation and relativity assumptions to produce a broad budgeting range. Real premiums depend on the lease, valuation date, professional evidence, negotiation and the law then in force. It is not a quote.
This estimates the premium for a flat lease extension. Leasehold houses follow a different process. Always take professional advice for your specific lease.