13. Add Your Windows and Doors
This is another opportunity to get creative and save money. Upcycled materials can be beneficial, and you can also acquire older windows and doors from old houses. Alternatively, you can choose new traditional windows or a sliding glass door.
14. Interior Framing
Wood studs are the perfect way to frame the interior of your home. If you prefer, you could attach the drywall with spray foam and steel studs instead.
15. Add Electrical Wiring
Electricity will be necessary, but do not add your own wiring unless you have experience working with electrical wires. This is one step where it could be very beneficial to spend some money in order to get a professional involved.