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    PropertyKiln

    Lease Extension Premium Calculator

    Written by Scott Jones, founder of PropertyKiln.

    Estimate the premium under current rules and the reformed Leasehold Reform Act 2024 — including marriage value warnings.

    This calculator provides estimates based on current UK tax rates and regulations. It is not financial advice. Results depend on your individual circumstances. Consult a qualified accountant for advice specific to your situation.

    This uses a simplified statutory formula. A surveyor's valuation will use precise tribunal-tested rates and relativity tables — treat the output as indicative only.

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