No. 7.5m (7 or 7.5? - would need to check) is with a system to BS 5839-1 that each detector has a sphere of influence of 7.5m. So if 7m in a circle around a detector doesn't cover the entire room then an additional detector would be required.
That was a screen grab from the aico app. I was wondering because an etension I have just wired today has a bedroom (downstairs) with one door which leads to the lounge, and then an ensuite, which also has a door to a hallway. I have wired for a smoke outside both doors (ie. in the lounge and hallway)
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