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Two storeys being ground and first? If this is the case, and you don't intend to do a loft conversion then there is no need for a door to your kitchen/diner (see top-right example in the above building regs part B screenshot).
Saying that, it doesn't seem too onerous to add a door as the above plans and it might help stop kitchen smells spreading throughout the house? A FD20 door would best future proof you should you wish to build upwards at a future date.
You will need to appoint an approved inspector to sign the above off now. Doing it retrospectively in say 10years time will require the works to meet regs at that point rather than when the works were done.
EstelleGetty-
Yes, exactly - and thank you for the clarification - I know you provided the information I needed in that picture, but this explanation made it sink in. This makes sense to me now. We're not planning to convert the loft so with our two liveable storeys it feels as though we can get regs sign off without the fire door being needed, though it may be best practice. I'll ask the builder what that might cost us. Cheers buddy
ReekBlefs
Thanks all, this is super useful. It's a two storey property with stairs, and while the stairs don't go directly into the kitchen/diner, they do run parallel to it so I've assumed a door would be needed:
However I do have some familiarity with the equivalent regs for flats and I'm not sure they'd apply in this situation - because the escape route is not on the same storey as the fire risk, the route itself would still be clear unless the fire was really spilling out into the hallway.
Can anyone recommend a third party building regs company who could clarify for me?