Scope creep
Scope creep is work that enters a project without a matching change to the price or the programme. These posts cover how to spot it, price it and stop it becoming your problem.
Charging for design changes after client sign-off on a RIBA stage
Stage 3 closes, the client approves, and three weeks later they want the roof pitch changed. Here is how to tell a revision from a new instruction, and what to charge.
How to define deliverables so a client cannot expand them
A deliverable written as a noun has no edges. Give each one a count and an acceptance test, and there is nothing left for a client to widen.
How to charge for extra revision rounds
A revision round becomes billable the moment it stops matching the proposal. Define a round properly, then price the extra ones from what delivering one costs.