Public Realm Strategy - Public forum - Planning Advisory Service (PAS)

I am currently trying to ascertain the costs involved in employing consultants to undertake a Public Realm Strategy for a Town Centre. Can anyone offer any insights into this? I understand that the scale of the town centre will have implications on costs but for the time being I'm just after a ball park figure. Additionally, is anyone aware of Public Realm Strategies that have been undertaken in-house?