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We would recommend extending your lease to keep it above 100 years but critically, before your lease drops below 80 years—this avoids marriage value and keeps the premium lower. If you are planning to sell or remortgage, the earlier you extend the better to avoid complication. Many mortgage lenders now insist on a minimum term of 85 years at application stage. A lease of 125 years + will ensure it is not a concern to prospective purchasers.
Usually 6–12 months for the statutory process, but delays can happen if negotiations take longer or if the matter must be referred to Tribunal (which is very rare).
Yes—you can start the process and transfer the benefit to the buyer so they can complete it after purchase.