Ok, so I've searched for similiar questions about granny flat rentention but my problem seems unique so creating my own thread. I rented a house for 2 years when the landlord offered to sell it to us. We agreed a price and purchased in 2014. There is a detached garage which was built with the house in the 1950's in a small estate. The previous owner intended converting the garage to a granny flat and had about 90% of the work complete when we moved in. Bathroom, electrics, flooring, insulation and plumbing were all completed by previous owner. They had even replaced the garage door with a large window and put in a side entrance. We bought the house knowing there was no pp for the work so it was sold to us as a garage which was fine with us at the time. We recently put a kitchen in when my sister was stuck for somewhere to live so it is perfectly habitable right now. We would love to make it legal and are wondering now what the chances are of it being granted rentention for change of use as a dwelling? I don't believe it falls under any of the exceptions that I've read about. I'm realistic about it being refused but if it is, will I be required to 'change it back' to a garage and install a garage door again. Any advise would be much appreciated. Martin.