The aspects of the project must be clearly defined at the outset. The program, scope, and deadline should be set during the initial consultations so you'll know what to expect from your contractors while the project is in progress. The program involves the basic details of the design, including the floor plan and the concept. This is also the phase where you have to sort through details you want to add prior to construction. If you want to tweak aspects of the design or add fixtures which don't really complement the theme, then you have to consult your designer and ask to incorporate all these into the plans.
The schedule should cover the design and building phases, with defined and doable deadlines for each. The schematics of the project and all the custom changes should be finished within the design phase so the architect (or home designer) can work out proposals for your contractors. Permits are also prerequisites to construction, so the documentation should be sorted out before the builders and rented equipment arrives. The scope of the project is also determined during the design phase. It's important that the major changes are identified before construction commences so your contractor isn't delayed by additions and improvements.
Clarify all of the expected deliverables and make sure your designer and contractor meet the deadlines. Don't be swooned by references and credentials; demand for termination and dispute clauses in the contract. You have to cover for delays in the schedule or an unexpected snag in the construction. There's nothing worse than stalling a renovation project because you're too busy with litigations and claims. Your consultants should have recommended better house designs before executing one that's impractical to implement. Conflict resolution clauses ensure you'll finish the renovation project, even if the schedules overshoot the deadline and you're forced to pay more than you're supposed to.