Unless there is a peppercorn rent, a leaseholder will pay ground rent to the freeholder. It is not uncommon for that ground rent to increase throughout the term at intervals. Some of these rents, such as those that double or are linked to the value of the property, can be onerous and recently, as seen in the Press, make it difficult to obtain a mortgage.
A lease extension buys out the remaining rent payable and the new, extended lease (under the 1993 Act - statutory lease extension) will be at a peppercorn (£nil) rent.
In certain cases, a revised ground rent can be negotiated through informal negotiations, to reduce the premium. If negotiated correctly this can benefit both the leaseholder and freeholder. (The Law Commission and the Government are looking at making all new leases subject to a ground rent of £10 per annum, so this may not be an option in the future).