The cost to add on a room can range from $25,000 to $250,000 depending on the size and features. Factors like permitting, foundation work, plumbing and HVAC can significantly impact the final cost. Rooms with plumbing and electrical such as bathrooms and kitchens tend to be more expensive than adding a bedroom or office.

Key questions include their years of experience, examples of past work, license and insurance info, project timeline and communication style. Always check references too.

Yes, it’s recommended to get quotes from 3-4 contractors to compare pricing and visions for the project. Make sure all bids cover the same scope of work.

Common permits include building, electrical, plumbing, mechanical, zoning approval. Your contractor will usually pull the needed permits, but check with your local permitting office.

A contractor can assess if your home’s structure, foundation, roof, siding etc. can support an addition. Zoning laws also determine allowed addition size.

Hire an architect to create preliminary drawings for the addition layout, look and feel. They can also help with permitting and contractor selection.

Being your own GC can save money but requires extensive time and knowledge. Most advise hiring a qualified general contractor to manage your remodel or addition. If you want more control over your project than a GC allows, a Construction Management company may be a better fit.