hi, is there any regulation on whether a 3 storey building split into 4 small flats needs 30 or 60 minute fire doors ?

also If it was split before 1991 lacors does not apply is that correct ?

if so what does ?

thank you

LACORS applies to any conversion to flats that does not comply with Building Regulations - this is usually where a flat has been converted from a house or similar - and so would apply to anything before 1991 and sometimes post 1991 if done 'under the radar'.

Purpose Built Flats are subject to the LGA Guide to Fire Safety in purpose built flats (unsurprisingly!) regardless of age in conjunction with the MHCLG Consolidated Guidance for residential buildings. Many large scale redevelopments of existing commercial buildings (e.g. offices to flats) also come under this guide as they are in effect purpose built from a shell in accordance with Building Regulations to the same spec as if built from the ground up.

Fire doors in blocks of flats are generally 30 minute doors.