Define the renovation before comparing bids
Create a short written brief identifying the rooms, structural or mechanical changes you expect, must-have features and work you know is outside the project. If drawings already exist, make sure every bidder prices the same revision.
Clarify design, permits and trades
Ask who is responsible for design development, engineering where needed, permit applications and inspections. Find out which work is self-performed and which trades are subcontracted, and who manages their schedule and deficiencies.
Read allowances and exclusions closely
Cabinetry, fixtures, tile, flooring and other selections can be fixed-price or allowance-based. Ask what each allowance assumes and how upgrades, credits and taxes are handled. Exclusions deserve the same attention as included work.
Use milestones and written changes
Payment timing should match a clear contract and project milestones rather than vague progress claims. Ask how unforeseen conditions and owner-requested changes are documented, priced and approved. Finish by understanding cleanup, deficiency completion and the warranty process after handover.