Hi, I want to extend my sitting room at the back of our house by 10 to 12 feet approx, because of an extention of that lenght having been built by neighbour, which renders my patio area redundant (between neighbour's extension and my narrow kitchen extension to the right (neighbour is on our left), so my new extension will be taking up the space between the two. Please let me know how to proceed. Do I need an architect or do I just call a builder? I am assuming it will be a relatively small project. All advice much welcomed. Thank you.