I should think that there are a fair bit of issues with regards to the building because of the increase of living space and obviously the building codes and all of that that you’ll need to get approvals for. So you’d definitely need to find out who the relevant bodies are (council, construction/builders, etc) so that you can go to them and put through your proposal for your extensions before you get things done. I’m no expert, but I would play it safe and make sure that everything is all green-lighted by everyone especially if the extension is going to be a permanent fixture to the building going forward.