Expect it to take 4 to 6 weeks, assuming no delays with permissions or material procurement. Pre-construction time ranges from 2 to 8 weeks (contractor hiring process, sourcing materials, and obtaining permits). This is followed by a period of 20 to 30 days of real building (demolition, inspections and sign-offs, installations, and clean-up). Finally, there will be 1 to 5 days of post-construction time (walk-through with the contractor, fixes and adjustments, and final payment).