There's no average cost in adding a room as it varies greatly depending upon what you'd like to put in the room, how big of a construction/change that needs to be done, the construction company cost, the permit etc.
I would suggest calling a couple construction companies and obtain bids.
Realtor & Certified Stager
United Real Estate
I live in Windsor Park. I think it really depends on what the answer to parking becomes? I have seen many people convert to more living space and still provide a covered parking option... Many homes in WP don't have either carports or even garages to start. If you want comps for your area...let me know! I can pick apart which ones have parking solutions and which ones don't.... more