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A brief does not need to be long. It needs to be specific about the things that cannot change and honest about the things that can.
Purpose and users
Say who will use the building, how, and what a good day looks like there. Everything else follows.
Budget and time
Share a range, not a secret. A contractor can only advise on value if they know the envelope.
Constraints
Access, neighbours, listing, occupation, funding dates. List them all, even the awkward ones.