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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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Some building control depts. have allowed loft conversions under a certain size to have an upgraded alarm system fitted in lieu of rated fire doors. I think this is what the architect is getting at. It would all be agreed by BC at the design stage anyway.
Whether this is likely to change in view of recent events I dunno, but the local BC office should be able to confirm.
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