Fire Alarm in a building with no communal area

[stewbow]

The building has lower ground floor (split level) flat, ground floor flat and a 1st floor flat, all with their own entrances. The council are dragging their heals a little as to what type of system or systems install as they need to come under the HMO registartion scheme.
I think that the floors are half hour fire rated.

I'm thinking 3 seperate Grade D systems, but do they have to be interlinked flat to flat?

and thoughts?

[jokar]

If the Local Authority decide that it is an HMO then they may well decide to insist on an L2 system.  With only 30 mins protection and a fire in one flat may affect another and they will all have to evacuate.

[kurnal]

If the evacuation policy is stay put then self contained detectors in flats interlinked only to other detectors  in the same flat. If full evacuation required then I would suggest you need individual smoke alarms in each flat backed up with  a seperate L2 system with heat detectors in each flat, and self contained smoke alarms in each flat