coach house

Hello - to anyone with advice/help, We have a coach house with an internal door going into our garage, at the rear of the house we have a garden. There is a window within the garage that we want to convert into a door (french doors) to gain access to the garden internally. The garage will...

Hello. Would really appreciate some advise. Could we convert our garage to a bedroom on our coach. I have attached a photo. We own the garage on the left next to the front door. Thanks in advance.