I'm planning an extension and as part of that I'm looking to relocate the front door and create an entrance hallway. I want to create a hall about 1.7m wide with the front door to the left and stairs on the right as you enter. Now can I start the stairs butted up to the front house/extension wall but with a quarter turn at the bottom to save space ? I do don't understand if I can have the front door swing open in front of the stairs landing in this way or not?