You can't guess at steel beam size, it needs to be specified by a structural engineer along with other structural members. Joist sizes depend on span and spacing.
does a steel beam go under front and rear dormer from gable wall to party wall? Some dormers i have seen without them.
Also once plan submitted and PW notice served can i start building work (giving building notice) on gable end and rear dormer until planning approved (can take up to 8 weeks) for front dormer?
Need to get a move on before winter arrives. It will be done to building regs. Will have plans done for that too in a couple of weeks.
any steel beams need to be calculated by a structural engineer working in conjunction with whoever is producing the architectural building regulations drawings .
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