There are many types of smoke alarm on the market and they cost from under 5. You can buy them at most DIY, hardware and electrical shops, and at some supermarkets. Always look for an alarm that conforms to the British Standard. Smoke alarms should meet BS 5446 Part 1, and carry the well-known kite mark. The number of smoke alarms to fit in your home depends on your particular circumstances.
Fires can start anywhere, so the more that are fitted the higher level of protection.
For minimum protection one smoke alarm should be fitted on each floor of your home. If your home is on one level, you should fit the alarm in the hallway between the living and sleeping areas. If your home has more than one floor, one alarm should be fitted at the bottom of the staircase with an alarm on each upstairs landing. Smoke alarms need very little maintenance. A few minutes of your time each year will ensure that your alarm is working and could help save the lives of you and your family.