For domestic grade D, category LD2 to BS5839-6:2004 on a 'normal' two story house existing property you need mains powered alarms, battery backed and all interlinked, either off of it's own circuit, or each off a well used lighting circuit, this may be wired in either T+E if radio link, or 3+E if hardwire interlinked.
Hallway,landing, and living room either optical or mixed mode and a heat alarm in the kitchen, this is from Aico's Electrical contractors hand book, it goes further to state that a heat alarm may be required in an integral (to house) garage, and either a mixed mode or ionisation alarm in bedrooms, the former point is the minimum required, the latter may be required by the LABC.
For new builds, as above except the living room may be optional.
I have just fitted Aico's wireless ones on a rental property, and BC wanted six in total fitting.
The LABC can be a law unto themselves, so it is better to ask them what they require.
Edit: forgot to answer the original question, No you don't have to fit smokes on a CU change.
Hallway,landing, and living room either optical or mixed mode and a heat alarm in the kitchen, this is from Aico's Electrical contractors hand book, it goes further to state that a heat alarm may be required in an integral (to house) garage, and either a mixed mode or ionisation alarm in bedrooms, the former point is the minimum required, the latter may be required by the LABC.
For new builds, as above except the living room may be optional.
I have just fitted Aico's wireless ones on a rental property, and BC wanted six in total fitting.
The LABC can be a law unto themselves, so it is better to ask them what they require.
Edit: forgot to answer the original question, No you don't have to fit smokes on a CU change.
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