We want to buy the freehold of our building. Are there additional costs, other than the price of the freehold?

It depends on what route you take

If you are privately negotiating to buy the freehold outside the 1993 Act there are no rules regarding costs. It is a matter of agreement between the parties.

If you are proceeding under the Leasehold Reform, Housing and Urban Development Act 1993 you will be responsible for your landlord’s costs. This is generally limited to  the legal,valuation costs, transferring the freehold and checking your right to buy the freehold.