Our house is a standard 2-up 2-down terrace (well, end terrace) with the usual kitchen / bathroom extension on the back done many years ago.
Beside the kitchen, in the gap between our kitchen and the neighbours, is currently a temporary style utility room - single brick course low height wall, uPVC windows and some form of sheet plastic slightly-pitched roof. I want to knock this down and rebuild properly with a flat roof design and also knock out some walls, involving RSJs, to open the kitchen up a little.
I also have a very similarly constructed front porch that I would like to slightly enlarge and build properly with better insulation and a stronger front door. The roof on this would be pitched.
My question: proper planning is going to be required, but do I need the services of a structural engineer or an architect in order to draw up the plans? These plans would then be presented for any planning permission and also to builders for quoting.
I could be confusing the roles a little, I am assuming SEs do drawings and I'm assuming the job is a little basic for an architect (after all, I'm not after anything adventurous - the end result will look very similar to what is currently there). But in either situation, I need proper calculations doing as removing the walls impacts a double-course outer wall and the utility currently has limited-to-no foundations.