The FSO applies to

• all premises, particularly 'all workplaces and the common parts of buildings containing 2 or more domestic premises'
• the 'common parts (communal corridors and stairways) of blocks of flats and houses in multiple occupation' 
• the 'building’s structure, external walls (including widows, balconies, and other attachments), and any common parts. The common parts include plant rooms, communal rooms, and doors (including doors between the dwelling and the common parts)'

What the FSO does not apply to:

• the only premises the FSO does not apply to are single residential dwellings such as houses, flats and bungalows. In multi-dwelling premises this means it is only the individual flats that the FSO does not apply to 

Learn more about the FSO in the government guidance 'A guide for persons with duties under fire safety legislation'.

.Go to the government Guidance