The statutory premium to extend your lease or buy the freehold — term, reversion and marriage value — with the 80-year cliff mapped live and the 2024 reform built in. An estimate, not a formal valuation.
Advanced valuation rates (tap to tune)
Sportelli defaults: 5% deferment, ~7% capitalisation. Real cases vary by tribunal.
Premium vs years remainingthe 80-year cliff
The marker rides the curve as you drag — and leaps the moment you cross 80 years.
Premium to extend
—mid estimate · likely —
Term (ground rent)
—
Reversion
—
Marriage value
—
—
After the 2024 reform (marriage value abolished, not yet in force) → —
Estimate using the established term + reversion + marriage-value method (relativity curve). The Leasehold & Freehold Reform Act 2024 has abolished marriage value in law (upheld by the High Court, 2025) but the valuation change is not yet in force — until it commences you still pay it under 80 years. Not a RICS valuation, not legal advice — take professional advice before serving notice.