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Ouch, much more than I would have guessed.
If you've got a lease of more than 80 years and a reasonably chunky ground rent, a lease extension is going to cost a bit because the landlord has to be compensated not only for the deferral of its (entirely hypothetical) right to recover possession of the flat for a further 90 years but also for the loss of rent over the remainder of the term of the lease.
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A regular lease extension doesn't deprive the freeholder of ground rent. That's only the case if it's via a section 42 notice.
I was initially quoted £13k for mine with 89 years remaining (not section 42) but a chartered surveyor (£720) seemed to have no problems negotiating that down to £6k. Solicitors fee was £1k.
Ouch, much more than I would have guessed.