Lease extension calculator
A rough estimate of the premium to extend a flat's lease by 90 years under the statutory route. Free
How it's made up
A simplified version of the statutory formula: the freeholder's lost ground rent and reversion, plus half the "marriage value" when under 80 years remain. It uses a standard relativity table to estimate the long-lease value. Real premiums vary, and you'll also pay both sides' legal and valuation fees. Get a specialist valuation before serving notice.