Convert freehold garage to self-contained studio

[eshroom]

Here's the link to the property: http://catalogue.auctions.savills.co.uk ... gue/#&&s=2

Am I ever likely to get planning permission to convert this? Only looking to do a one story but of course it would come in taller than the current garage and I'd like to put a gabled roof on it.

Ultimately, I need to speak to the council, but if anyone could give their insight into whether or not they think it would be an outright no, that would be much appreciated.

Many thanks in advance