What proportion of the total service charge is payable by each leaseholder?

The lease will usually specify the proportion of the total service charge that each leaseholder will be responsible for although this may not always be equal and may depend upon factors such as the number of rooms or the floor area of the property. The proportion is very unlikely to change. An exception might be where there is an additional property that reduces the proportions paid by other leaseholders e.g. the sale of a flat formerly occupied by a staff member.