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Generally when you hard wire them you use a multicore cable and also wire them together. In which case you can choose from the range of different smoke alarms depending on your budget. I normally budget around £30 per smoke alarm, being a requirement they tend to carry a bit of a premium price. Fitting can be expensive if you want concealed wiring depending on access to the ceiling void.
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@aggi I do not know who is telling you will get away with fire alarms instead of fire doors but they are wrong and in the current climate you are unlikely to get a lot movement on that. If you have added a floor to your house you need to ensure a Protected route to a place of safety out of the house that means fire doors end of conversation the LABC have a good leaflet here
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Airhead
Zebra_Cyclist
@aggi
Due to the lack of fire doors in my flat it appears that I need a lot of smoke alarms to keep building control happy.
Some need to be hard wired (those on the landings mainly) but others can be battery powered which will simplify installation. They are all meant to talk to each other though so that one alarm can set others off.
In an ideal world I'd buy a load of Nest smoke alarms and go with that but the cost is prohibitive.
Any suggestions for cheap but decent smoke alarms that can be networked together and available in wired and battery powered? Cheers