For the builders building.

Most structural work, electrical changes, plumbing modifications, and additions require permits. Cosmetic work like painting or flooring typically doesn't. Check with your local building department before starting any significant project to avoid costly violations.

Verify state licensing, check insurance coverage, read reviews across multiple platforms, request at least 3 references from recent similar projects, and get 3 written bids. Never pay more than 10-20% upfront, and always have a detailed written contract.

Costs vary dramatically by project scope, location, and materials. As a rough guide: room additions $150-400/sq ft, kitchen remodels $25k-75k, bathroom remodels $15k-40k. Always get multiple detailed bids and build in a 15-20% contingency budget.

Timelines depend on scope: minor remodels 2-6 weeks, kitchen/bath renovations 6-12 weeks, room additions 2-4 months, whole-home renovations 6-12 months. Always add buffer time for permit delays, material backorders, and change orders.