Sometimes a visit to town hall will answer the question best.
They will have site plans (hopefully) that can show the footprint relative to the lot lines.
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if you like this house have your buyer's agent arrange a showing for you to look at this property and to find out if you could build a garage next to this house, zoning laws differ. If you have not picked a buyer's agent to help you start there, it is free and they are a great resource (not to mention you will have your own representation). email@example.com