The parties will need to agree a venue for the mediation.  If at least one of the parties is legally represented, it may be that their solicitors may be able to host the mediation.  Sometimes a party might prefer not to attend a mediation at the other party's solicitors' offices, instead preferring a neutral venue.  There are advantages in holding the mediation at a solicitor's office, particular as there are likely to be printing and copying facilities available, which are helpful when writing-up the settlement agreement/Tomlin Order.  In contrast, a neutral venue will usually have costs associated with it.  I have mediated at solicitors' offices, workplaces, hotels, business suites and even a football stadium.

Wherever the venue, at least two rooms are needed (one room for each party).  One of the rooms should be large enough for a joint meeting (holding all of the attendees, including the mediator).  It is also helpful for there to be a small room for the mediator.

The rooms should be soundproof and ideally, not next to each other.  It shouldn't be possible for a party to see what is going on in the other room.

It is also helpful for the rooms to have WiFi, and for coffee, tea and water to be available throughout the day.