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Can You Fit Your Own Interlinked Smoke & Heat Alarms? A Comprehensive DIY Guide


Interlinked smoke and heat alarms are an essential part of home safety. They provide early warning in case of fire, allowing you and your family to evacuate safely. This guide will walk you through the process of installing these devices in your home.

What You’ll Need

Step-by-Step Installation

Step 1: Planning your Alarm Locations

Firstly, decide where to place your alarms.
A Smoke Alarm should be fitted in the following locations -

Smoke Alarms should be mounted on the ceiling following these rules -
A Heat Alarm should be fitted in the kitchen
Heat Alarms should be mounted on the ceiling following these rules -
A Carbon Monoxide Alarm should be fitted in each of the following areas - Carbon Monoxide Alarms should be mounted on the wall following these rules -

Step 2: Ensure Alarms are Linked/Paired

Before mounting the alarms, it is important to ensure they are paired. Paired alarms mean that if one alarm is trigger, all othere alarms will also activate. You can test if the alarms are paired by switching all alarms on then press the test button on one alarm. All alarms should activate with 20 seconds of the the first alarm. If any of the alarms do not activate then follow the pairing procedure found here.

Step 3: Mounting the Alarms

Use the ladder to reach the ceiling. Mark the spots where you’ll install the alarms. Drill holes at these spots and insert wall plugs. Attach the mounting plate of each alarm to the ceiling using screws.

Step 4: Testing the System

Once all alarms are installed and interlinked, test the system. Press the test button on one alarm. All alarms should sound, indicating that they are correctly interlinked.


Installing interlinked smoke and heat alarms is a straightforward task that you can do yourself. It’s an important step in ensuring the safety of your home. Remember to test your alarms regularly and replace the batteries as needed. Stay safe!.

InterAlarms can help

InterAlarms can provide an interlinked smoke and heat alarm system in your home. Please complete our enquiry form here and we will provide a quote for a complete safety system for your home.
Alternatively we provide do-it-yourself kits here. These are supplied pre-linked with fully fitting instructions.


95 Achray Road, Cumbernauld. G67 4JG
Phone: 0800 999 1622
Email: info@interalarms.co.uk