This answer depends on many factors. Depending on the size of your GC, they may have to schedule you around other projects that they are already involved in, or they may be able to start immediately. If it’s a large firm, they will have a larger team and a more flexible schedule. Does the project involve demo? If your project is new construction, it could take up to 2 weeks for the GC to obtain the proper building permits from the local inspector’s office. The GC will also need time to get subcontractors scheduled. Everything is negotiable and a good contractor will work with you to create and meet realistic deadlines.