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It is likely that the walls to the staircase and means of escape will meet the required rating. Likewise, doors to comply with Building Regs will only need to be 20min rated - pretty much any unglazed door will achieve that.
Typically sprinklers are used where people have opened up the ground floor plan and don't want to reintroduce the removed walls. Your plan is much easier to make comply.
EstelleGetty-
So do you think we'd still need to put some kind of double/folding door into that large opening and to the kitchen to comply or would having all the smoke alarms be enough?
I think this is why I need to chat to BC inspector, at least to get an idea of costs involved -
pretty much any unglazed door will achieve that.
Mine were all Victorian/Edwardian wooden doors and they didn't class as fire doors
motman
aggi
Thanks for the info. So we're not completely open plan, we still have most of the corridor but no door to the kitchen and a double wide opening into the rear reception room. We already have wired smoke and heat alarms in the kitchen and hallways and would rather have them in all rooms than switching to fire doors. The only unknown is the downstairs and this 'Fire Corridor' rule. Will have a look into these mist systems and see if I can get hold of a building control inspector to sound them out on what the options might be.