If you might be extending or altering the roofline you might properly require planning permission and should you stay in a listed property or in a designate area, you will nearly certainly require consent before carrying out any work. Check with your native planning department earlier than beginning any work. Carrying out a survey and calling within the companies of a structural engineer should offer you a clear thought of the sort of work you are likely to face when renovating a house.
If the home isn’t big enough in your wants contemplate how you can change it to rectify …