Council houses in Highland are to be fitted with upgraded fire safety features by February next year.
The council is complying with new legislation brought in in the wake of the Grenfell Tower tragedy.
The new standards require one smoke alarm installed in the room most frequently used for general daytime living purposes and one smoke alarm in every circulation space on each storey, such as hallways and landings including porches greater than 1 square meter (10 square feet).
One heat alarm must be installed in every kitchen.
All smoke and heat alarms are to be ceiling mounted and interlinked.
The council will also be complying with requirements that carbon monoxide detectors be fitted where there is are carbon-fuelled appliances such as boilers, open fires, heaters and stoves or a flue.
Alarms will meet the new standard and can either be tamper proof long-life lithium battery alarms or mains-wired.
The upgrade will cost £1m, to be found from the council’s housing revenue budget.
A Highland Council spokesman said: “We have currently been carrying out upgrades when we come across properties requiring the work , for example, when they are empty.
“We intend to initiate a programme of replacements across our stock in the coming months to comply by the February 2021 deadline.”
The new legislation includes extending the mandatory installation of sprinklers in flatted accommodation and in larger multi-occupancy dwellings and those which provide care.
The changes are part of a number of actions for improving building and fire safety which were agreed by a ministerial working group set up in the wake of the London blaze, which killed 72 people.