Knowing where to put your smoke and heat alarms is just as important as having them installed. The right position gives an alarm the best chance of detecting smoke quickly and making sure everyone in the home can hear it.
As a general rule, interlinked alarms should be fitted to the ceiling, away from walls and obstructions, with alarms positioned throughout the home rather than relying on a single detector.
The exact requirements vary between England, Scotland and Wales, so it’s worth checking the rules that apply to your property.
General Rules for Positioning Smoke Alarms
Smoke alarms should be positioned so they provide early warning throughout the home, particularly along escape routes such as halls and landings. Depending on where you live, the type of property and how it is used, alarms may also be required in living rooms and other rooms.
The exact number and position of alarms depends on the applicable regulations, guidance and the alarm manufacturer's installation instructions.
Larger rooms may need more than one alarm. As a guide, each LINKD alarm has a coverage radius of around 6 metres, so make sure there are no areas of the room left outside its coverage.
When installing a ceiling-mounted smoke alarm, aim for a central position at least 300mm from the nearest wall or light fitting. Avoid areas where airflow could interfere with detection, such as directly above heaters, cookers or air conditioning vents.
In halls and landings, position alarms close to bedrooms so they can provide effective warning while occupants are asleep. Some standards and property types require an alarm within 3 metres of bedroom doors.
For sloping ceilings, smoke alarms should be positioned within 600mm of the apex.
Where to Place Smoke Alarms in England
In private rented properties, landlords must provide at least one smoke alarm on each storey containing living accommodation. Additional requirements may apply to HMOs, licensed properties, or where building work or a fire-risk assessment requires a higher standard.
For existing homes pre-1992 in England, there is no blanket requirement for a Grade D, Category LD3 or interlinked system under BS 5839-6.
For new dwellings and certain building work, Approved Document B provides guidance on the number and location of smoke alarms, including Grade D2, Category LD3 systems. In practice, this means:
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At least one smoke alarm in the circulation space, such as the hallway or landing, on every storey
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A heat alarm in the kitchen, if it isn't separated from the circulation space by a door
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All alarms mains powered with a battery back-up, and interlinked.
For greater protection, it is sensible to have a smoke alarm in the main living room as well as the circulation spaces.
You can find more information about the requirements on our England smoke alarm compliance page.
Where to Place Smoke Alarms in Scotland
Since February 2022, Scottish homes must have a smoke alarm in the main living room or the room used most during the day, as well as smoke alarms in hallways and landings on every storey. Scotland's domestic fire alarm standard requires smoke and heat alarms to be ceiling mounted.
A heat alarm should be installed in the kitchen, while a carbon monoxide alarm is required in rooms containing a carbon-fuelled appliance, such as a boiler, gas fire, open fire or wood burner.
In open-plan spaces, alarm positioning depends on the size and layout of the area. The aim is to make sure the whole space is adequately covered rather than relying on an alarm that is too far away.
For more information, see our Scottish smoke alarm compliance page.
Where to Place Smoke Alarms in Wales
The requirements in Wales vary depending on the property. New homes follow Building Regulations requirements, while rented properties have additional fire safety requirements.
For rented homes, a smoke alarm should be fitted on every storey and must be mains-powered and interlinked. A heat alarm in the kitchen may provide additional protection and may be required under other fire safety standards applicable to the property, but it is not part of the basic smoke alarm requirement created by the Welsh FFHH Regulations.
For Welsh rented homes, a working CO alarm is required in each room containing a gas appliance, oil-fired combustion appliance or solid fuel-burning combustion appliance. Rent Smart Wales expressly confirms that a gas cooker or hob counts as a gas appliance. This is different from the regulations elsewhere in the UK
If you own or manage a rental property in Wales, make sure your alarm system meets the requirements that apply to your property. You can find the latest guidance on our Wales smoke alarm compliance page.
Where to Place Smoke Alarms in Northern Ireland
Private rented homes in Northern Ireland are covered by the Smoke, Heat and Carbon Monoxide Alarms for Private Tenancies Regulations (Northern Ireland) 2024, while holiday lets and B&Bs follow separate NIFRS guidance updated in 2025 and 2026.
For private rented homes, a smoke alarm is required in the room most frequently used for general daytime living and in every circulation space such as halls, stairs and landings. A heat alarm is required in every kitchen. Smoke and heat alarms must be interlinked. They can be mains powered, sealed tamper-proof battery alarms, or a combination of the two, provided they meet the required standards.
A carbon monoxide alarm is required where a room or circulation space contains a fixed combustion appliance or a flue. Appliances used solely for cooking, such as a gas cooker or gas oven, are excluded from this particular private tenancy requirement.
For holiday lets, the NIFRS 2026 guidance requires mains-powered interlinked alarms in all circulation areas and living spaces, with a heat alarm in the kitchen. A recorded fire risk assessment is now mandatory and determines the exact layout required for your property.
If you own or manage a property in Northern Ireland, make sure your alarm system meets the requirements that apply to your property type. You can find the latest guidance on our Northern Ireland smoke alarm compliance page.
Carbon Monoxide and Heat Alarms
Carbon monoxide alarm requirements vary across the UK and by property type. They are commonly required where rooms contain fixed gas, oil, solid fuel or other carbon-fuelled appliances, although there are important differences over appliances used solely for cooking. Always check the rules applicable to your country and property type.
CO alarms should always be positioned in accordance with the manufacturer's instructions. As a general guide, where a wall-mounted alarm is permitted, it is normally positioned high on the wall, above the level of doors and windows, rather than simply at 'head height'. Positioning requirements can also specify a horizontal distance from the appliance.
Heat alarms may be suitable in some rooms containing open fireplaces or other sources of combustion. However, they should not automatically be used as a replacement for a smoke alarm.
A heat alarm should be positioned centrally on the ceiling where possible. It should be no more than 5.3 metres from any point in the room.
For ceiling-mounted heat alarms, keep the alarm at least 300mm from the nearest wall or light fitting. On a sloping ceiling, position the alarm within 150mm of the apex.
Heat alarms should not be used as a replacement for smoke alarms in areas where a smoke alarm is suitable.
Where Smoke Alarms Can’t Go
Poor positioning can lead to delayed detection or repeated false alarms. Avoid installing smoke alarms:
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Inside a bathroom, or directly beside one, where steam triggers false alarms
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In positions where normal cooking fumes are likely to cause nuisance alarms. Kitchens are normally protected using an appropriate heat alarm where the applicable system requires one.
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Directly above a cooker, heater, radiator or air conditioning vent
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Within 300mm of a wall or light fitting, where airflow is restricted
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Over a stairwell or floor opening, where it's difficult to reach safely for testing
LINKD Alarms for Across the UK
LINKD Alarms are independently tested and certified to the relevant British and European standards, giving you a reliable way to create an interlinked alarm system throughout your home.
Our CORE alarm bundles are supplied pre-linked for convenience, and use a sealed, tamper-proof 10-year battery. Once you've worked out where your alarms need to go, installation is simply a case of mounting each alarm and testing the system.
The SMART range offers the same interlinked protection, with the option of adding a WiFi Gateway for phone notifications if an alarm is triggered while you're away from home.
You can build your interlinked alarm bundle based on the number of rooms and storeys you need to cover directly on our website to ensure you have complete coverage.
Note: CORE and SMART alarms cannot be interlinked together.
Frequently Asked Questions
How many smoke alarms do I need in my house?
The number and type of alarms will depend on the property location, layout, and occupants. etc.
Ideally, circulation spaces such as halls and landings should be protected, but Scotland, England and Wales have different statutory requirements.
Can a smoke alarm be wall mounted instead of ceiling mounted?
Ceiling mounting is the standard recommendation, since smoke rises and spreads across the ceiling first.
Some alarms can be wall mounted if the manufacturer's instructions allow it, positioned above the level of any doorway, but ceiling mounting gives the fastest, most reliable detection in most rooms.
How far should a smoke alarm be from a bedroom door?
Some BS 5839-6 based guidance specifies smoke detection within 3 metres of bedroom doors, particularly where effective warning to sleeping occupants is important. The exact requirement depends on the property and the standard being followed.
Do I need a heat alarm as well as a smoke alarm?
Heat alarms are commonly used in kitchens because they are less susceptible than smoke alarms to nuisance alarms caused by normal cooking. Scotland specifically requires a heat alarm in the kitchen of every home, while requirements elsewhere depend on the property type, Building Regulations and the fire alarm system being specified
Does smoke alarm positioning differ between England, Scotland and Wales?
The basic principles of good alarm positioning are similar, but the minimum requirements vary between the three nations. Scotland has broader coverage requirements, while Wales has additional requirements for rented properties. Always check the guidance that applies to your property.
Disclaimer: This information is provided as general guidance on smoke alarm requirements and placement across the UK and was accurate at the time of publication. Requirements can vary between England, Scotland and Wales, and may also depend on the type, age and use of a property. It is not a substitute for current legislation, official guidance, Building Regulations or a professional fire-risk assessment. Always check the requirements applicable to your property and location before installing or upgrading a smoke alarm system.
