We'd need more info, got a floor plan?
The roof isn't that hard looks like a hip on gable would work.
You should also consider contacting a local design pro, the zoning laws can sometimes have hidden opportunities if you really need bigger. Also you say only 432 sf, That's actually a lot of space considering an average bedroom is 150 sf, a pro will be able to maximize the available space that you do have - it's what we do!

Thank you! Here are some layouts of the ground and 1st floor, have not worked on second story layout as I want to get the foot print straight and within the expansion guidelines. It is a master suite upstairs.