Full extension, rip the side of the house on two sides and build new bigger rooms attached.
Helpful with recycling windows and economical but strong alternatives to prebuilt cupboards. Very trustworthy guys, even kept an eye on the new puppy for a hour or two.

Approximate cost: $100K

This was so easy, renovating our house, adding 2 bedrooms, a family room, bathroom and an outdoor deck and pergola, that we thought about moving and doing it all again. Our renovation was completed way way in front of schedule, being promised 4 months, but being completed in 6.5 weeks, including floor polishing! Very professional builder, very particular, and very very prompt, as were his tradespeople. Cannot recommend Shane more highly.