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From the existing ones? They look like battery operated.
Even the alarm connected ones we had turned out to be battery operated. Not sure what the use case for power line operated smoke detectors are in a residential setting TBH; probably useful in an office where cabling them is super easy and you want them to talk to each other.
Howard-
Ah yes, misread the post you were replying to!
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I had to have them installed (in almost every room) in my previous flat as I had a loft conversion (so three floors in the building) but the rest of the flat didn't have fire doors. Seemed a bit pointless as the other flat didn't have to have them but it seems thems the rules.
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Not sure what the use case for power line operated smoke detectors are in a residential setting TBH
Well they're required by current building regs but apart from that you're golden 😂
Also if mains ones are already installed I suspect that @NickCJ replacing them with battery alarms would not be kosher.
I have Nest mains powered smoke alarms because I've never found a battery operated one I trust to be reliable - they're made down to a price point and I've had new ones from supposedly reputable brands not pick up smoke.
Standard mains powered alarms are cheap though.
NickCJ
aggi
Fox
Wouldn’t you have to somehow retrieve the old live cabling if you did that? I don’t love the sound of just chopping it and whacking a load of tape around it.