If my mother-in-law moves in with us next year, we'll need to create an extension at the front of our house for an en suite bedroom - how can we speed up the planning permission?

We've just had a new baby and are struggling for space. A ‘shoffice’ in the garden would provide a quiet retreat when working from home - do we need planning permission for this? 

I've seen a office above a shop that has heaps of potential. If I buy it at auction, can I apply for planning permission afterwards?

I'm desperate for more space in my south London Victorian terrace and have been blessed with a large loft. Do I need planning permission to create an extra attic bedroom and a balcony?