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Thanks buildersmate and jenniprice.
My drive from the gate to the garage is about 3.5 metres long. My room extension would be 3.75 metres long by 2.08 metres wide, the same length and width as my garage is now.
A year or two after the planning officers had turned down my application, I got the architectural technician to draw me up a plan for a brick garage with a first floor bedroom on top joined to the house. This time it was accepted. I got two quotes from builders for about �35,000 each and so I gave up on that idea.