as i said, only a fool...you must understand every type of house construction that's ever been used, and every permutation of loft dormer and loft conversion design that could be possible then, silly me.
Explains very clearly, working around an existing structure rather than removing or altering parts of it unnecessarily can save clients money, knowing this in advance of designing something can be invaluable and avoid costly design solutions post planning.
I’ve worked on many projects where in order to design extensions / loft conversion it’s been helpful to understand the existing structure. It’s often useful to get a structural drawing of the existing building. This can show what elements of a building can’t be removed, what can be removed with...
Has your engineer or architect suggested a structure that either uses the existing loft floor structure if it's usable or replaces it with a new timber one that is strong enough, this means all structure is built from timber. This can be disruptive to a home but is a better way of building lofts...
The door swinging over the stairs does not comply with building regs. Also a landing at the top of the stairs has to be the same width as your stairs, I would argue also that your doorway doesn't allow this. Why do you want to do this and make it awkward for anyone accessing the stairs?
cheaper and easier than extending your roof by 200mm? This would require planning, and be an enormous pain to do. Why can't you build it all in timber? Why do you need steels at all?
why don't you ask your approved building inspector? This would see to be a bit of a grey area. What is this element of the design part of? Is this something that is being built?