Loft conversion - upgrading fire protection to stairwell

Hi All, Just looking into the requirements for loft conversions and the ways of making sure the protected stairwell is sufficient. I understand that the 'escape window' in a loft conversion no longer applies as a secondary escape route. So that then puts onus on the lathe and plaster (potentially) walls and ceiling which i understand do not afford 30mins fire protection. It is a hell of a job to take off all the plaster (and lathes) and reboard with modern stuff. It is still a hell of a job to overboard all walls and ceilings too. Not to mention existing, original plaster coving, door architraves, skirting boards etc...

Is there a way to show compliance without have int do extensive works throughout the hallway, landing and stairwell etc??

I have seen Envirograf intumescent paints that can be applied - but i cannot see certification to prove to building control they provide sufficient protection.

I have heard by specifying interlinked mains smoke detection in all habitable rooms is acceptable - is this a bigger job than re doing walls and ceilings?

Thanks for discussions...

What's your BCO say on the subject? Tests cannot be done to prove L&P upgrades work because no two L&P finishes are alike. BC don't like intumescent paints in dwellings much either as future homeowners wont bother about maintaining them.

"
In terms of your question regarding the upgrading of the doors and the use of intumescent paint. Technically you can upgrade the doors by other methods including intumescent paint .

however the method of upgrading the doors and the materials used must be tested and certified in accordance with BS476 Part 22 .

Currently no company has provided certification indicating that they have this test criteria in place"

This was his response...

I want to know if there is a tried and tested method to avoid taking all wall linings off and replacing (or overboarding) whilst still achieveing building regulations and obviously keeping occupants safe in the event of a fire...