Lease Extension Calculator

This calculator will give you an estimate of the premium for a lease extension for a flat, but it cannot give you the actual costs. In considering the likely total cost you should also bear in mind the leaseholder's liability for the landlord's costs. The eventual cost of the new lease will be the premium plus both your own and the landlord's "reasonable" professional costs. Stamp duty is also applicable above £125,000. These costs could be significant so be sure to get estimates from the professionals involved (likely to be at least solicitors and surveyors) before you decide to proceed.

We are aware that decisions in the First-tier Tribunal (Property Chamber) reflect increasing disparity between local market evidence and results from the calculator and its inevitable broad brush national approach. Therefore, you should not use this information in tribunal or court proceedings and neither should you take any other action based on this information without first getting professional advice. Although we offer an advice guide, Lease extension - Valuation about valuations under the Leasehold Reform, Housing and Urban Development Act 1993 (as amended), you should remember that the law and the way property is valued can change over time and that local evidence can vary.

Please note that this calculator cannot do calculations for leases with less than 50 years remaining (40 years for flats in Central London).

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