myjobquote

Home Cost Guides Smoke Alarm Installation Cost Article

Fire Alarm Installation Cost

Written by Samantha Jones

Samantha Jones

Editor-in-Chief

I have a degree in English & Writing. I have been working as a content developer for three years now and have also been freelance writing for three years. I have been focussing my freelance writing within the home improvement and DIY sector.

24th March, 2026

How we get our data

We gather our data from real quotes given by UK tradespeople to UK homeowners on the MyJobQuote platform.

At a Glance

The average cost of installing a fire alarm is around £100.
The job typically takes 1 to 2 hours.

In this guide:

Find out what fire alarm installation costs in 2026 by alarm type and power source.
Discover the key cost factors, typical labour rates, and what the installation process involves.
Learn about relevant UK building regulations, removal costs, and what to look for when hiring a fire alarm installer.

Get free estimates Are you a trade? Get more work today!

Want to discover the cost of fitting a fire alarm?

To get a fire alarm installed will usually cost around £100, but there are many cost factors that can change the overall cost, such as electrician prices, and the type you may need, such as interlinking smoke alarms.

Just need a quote for fire alarm installation?

MyJobQuote can help you. Enter a few project details and get responses from smoke alarm installers near you ready to offer you free, no obligation quotes!

Prefer to find out more first?

Our fire detector cost guide will tell you everything you need to know when installing a fire alarm.

Let's get started.

Average Cost of Installing Fire Alarm:

Depending on the complexity of the job, it usually takes: 1 – 2 hours

£100

How Much Does Smoke Detector Installation Cost?
Installing Fire Alarm Prices
Supply Only Costs
Labour Costs and Timescales
Factors That Impact Fire Alarm Installation Costs
What's Involved in Installing a Fire Alarm?
Choosing a Fire Alarm
Building Regulation for Fire Alarms
Cost of Removing a Fire Alarm
Checklist: Hiring a Fire Alarm Installer in the UK
FAQs
Sources

How Much Does Smoke Detector Installation Cost?

The cost of installing a fire alarm mostly depends on the type of alarm you want and how many you need for your property.

If you're installing an extra battery-powered alarm, you can buy one for £10 to £15. They're easy to fit yourself, but if you'd prefer a tradesperson to handle it, installation will typically cost £40 to £75.

Mains-powered alarms cost more, as they must be installed by a qualified electrician. Expect to pay £75 to £125 per alarm.

Smart fire alarms carry a higher price tag. A battery-powered smart alarm with installation costs around £80 to £100, while a mains-powered smart alarm ranges from £105 to £250.

Do I need a smoke alarm and a heat detector? I have a smoke alarm in the hallway, but no heat detector. Are they a legal requirement?

"It is possible to have heat without smoke, but smoke without heat is rare. Best to be safe and have both, or a detector that does both jobs."

Total Security Experts

Installing Fire Alarm Prices

The price to install your fire alarms will depend on the type you choose and how many there are. The biggest difference comes from the way they are powered.

Battery Powered

Battery-operated alarms can be powered by standard batteries or long-life sealed batteries. Although sealed ten-year battery alarms are pricier upfront, they are still cheaper to have installed than mains-powered alarms.

Type of Alarm	Cost per Alarm
Ionisation	£45 – £75
Optical	£40 – £70
Heat	£45 – £75
Smart	£80 – £200
Linked	£45 – £75

Want a custom price?

Post your job

Mains-Powered

Mains-powered alarms are wired directly into your electrical system. They must be fitted by a qualified electrician and usually include a battery backup in case of a power cut. A mains-powered fire alarm system gives you continuous protection without the need to change batteries.

Type of Alarm	Cost per Alarm
Ionisation	£70 – £125
Optical	£65 – £120
Heat	£70 – £125
Smart	£105 – £250
Linked	£70 – £125

Want a custom price?

Post your job

Supply Only Costs

Buying a fire alarm unit on its own is relatively affordable. Prices only rise significantly for smart alarms.

Type of Alarm	Cost
Mains-Powered	£10 – £20
Battery Powered	£10 – £15
Ionisation	£15 – £25
Optical	£10 – £20
Heat	£15 – £25
Smart	£50 – £150
Linked	£15 – £25

Want a custom price?

Post your job

Labour Costs and Timescales

Battery-powered alarms are straightforward enough to fit yourself. If you'd rather have a tradesperson handle it, expect to pay around £30 to £50 for the labour. The job should take no more than 30 minutes.

Fitting a mains-powered alarm requires a qualified electrician. Most charge per alarm fitted, with labour typically ranging from £55 to £100 per alarm.

You should expect the work to take 1 to 2 hours for the first alarm, with an extra 30 minutes for each additional alarm.

Ask a Trade

Got a question that only a tradesperson can answer? We have thousands of trades ready to answer any question you may have.

Ask your question

Factors That Impact Fire Alarm Installation Costs

For most homes, the alarm type doesn't affect the price too much. Costs are driven more by how many alarms you need, how they are powered, and how straightforward the installation is.

Location of property — Your property's location will affect the installation cost, with London usually having the highest rates.
Ease of access — If accessing your consumer box or running the wires is especially difficult, this may add to the cost. If you can't run the wires above the ceiling, you may need to pay extra to have the wires boxed in or just tacked into position along the ceiling.
Number of fire alarms — The more alarms you have, the higher the supply costs will be. Most electricians will quote you an installation cost per alarm, so the more alarms there are, the higher the fitting cost.

I've just spotted a replace-by date on my smoke alarm. I've pressed the test button, and it still seems to work. Do I need to replace it or not?

"It is always advisable to replace them once they have reached the expiry date, as you can’t guarantee the functionality of the alarm. It may be down to the internal battery or sensor within the unit."

CN Electrical

What's Involved in Installing a Fire Alarm?

There is a big difference between installing a battery-powered alarm and a mains-powered alarm. Battery-powered smoke alarms are a quick and simple job since you only need to screw the alarms into place.

Fitting a mains-powered alarm is a job that should only be done by a qualified, registered electrician because this work connects to your mains electrical system and can be dangerous if not completed correctly. The steps below show what is typically involved in installing a fire alarm:

Installing A Battery Powered Alarm

Decide where to place it — It should be away from any light fittings and bathroom doors.
Fix the base — If it is a replaceable battery model, remove the cover and use screws to fix the base of the alarm to the ceiling.
Fit the batteries — Pop in the batteries.
Replace the cover — Put the cover back on.

Installing A Mains-Powered Alarm

Your electrician will make sure there is a suitable supply — Either a dedicated slot on your consumer unit or a regularly used lighting circuit.
Protection — If you use a dedicated slot it is typically protected at about 6A.
Run and connect the cable — With the power off, the cable is run and connected at the consumer unit by your electrician.
Route the wire — Depending on the location of the alarms and the consumer unit, the smoke alarm wire may be run above the ceiling, or it may have to be boxed in.
Connect at the alarm — Next, the wire from the consumer unit is connected to the smoke alarm.
Link the alarms if required — If your alarms are linked, then a second wire is connected at the same time, which will go to the next alarm in the chain.
Fix the alarm and check connections — The smoke alarm is fixed to the ceiling with screws, and the connections are checked.
Finish up — Finally, the cover is put back on. Your electrician will complete any required certification and advise on testing.

Choosing a Fire Alarm

When choosing a fire alarm, consider the detection method that suits your home and the features you need. Some alarms combine multiple detection types in a single unit.

I'm buying a new smoke alarm, but my current alarm only lasted a couple of years. What types should I consider for a long-lasting alarm?

"Smoke alarms should be mains fitted, and will last a long time as they don't run on battery but have a battery for backup should the power ever go. A couple of years seems a bit short, but Fire Angel is a very good make that I've had no complaints for, and it lasts a long time (5+ years)."

WC1 Electricians

Ionisation Fire Alarm Cost

Ionisation alarms use a small amount of radioactive material to ionise the air inside the chamber, allowing a small current to flow. When smoke enters the chamber, it disrupts this current and triggers the alarm. They are best suited to detecting fast-flaming fires.

The average supply cost for an ionisation alarm is around £20.

Pros

✔ Quick to respond to fast-flaming fires
✔ Generally one of the more affordable alarm types

Cons

✖ More prone to false alarms near kitchens
✖ Less effective at detecting slow, smouldering fires

Optical Fire Alarm Cost

Optical alarms use an infrared LED and a light sensor. Under normal conditions, the beam misses the sensor. When smoke enters the chamber, it scatters the light towards the sensor, triggering the alarm.

They are particularly effective at detecting slow-burning, smouldering fires. The average supply cost for an optical alarm is around £15.

Pros

✔ Better suited to kitchens and living areas
✔ Effective at detecting slow, smouldering fires

Cons

✖ Can be triggered by steam or dust
✖ Less responsive to fast-flaming fires than ionisation alarms

Smart Fire Alarm Cost

Smart alarms connect to your home Wi-Fi and send alerts to your smartphone when triggered. Some models also integrate with other smart home devices, such as smart lights or door locks.

The average supply cost for a smart alarm is around £100, though prices vary widely by brand and features.

Pros

✔ Sends alerts to your phone wherever you are
✔ Can integrate with other smart home devices

Cons

✖ Relies on a Wi-Fi connection to function fully
✖ Quality varies significantly between brands

Heat Fire Alarm Cost

Heat alarms trigger when the air temperature rises above a set threshold. Because they respond to heat rather than smoke or steam, they are much less prone to false alarms. The average supply cost for a heat alarm is around £20.

Pros

✔ Ideal for kitchens and garages where smoke or steam could cause false alarms
✔ Less susceptible to nuisance activations

Cons

✖ Only activates once a fire is well-established, making them less suitable as the sole alarm in a home

Linked & Wireless Fire Alarm Cost

Interlinked fire alarm systems connect multiple alarms so that when one triggers, all alarms in the system sound simultaneously. This is especially important in multi-storey homes, where a fire in one part of the building might otherwise go undetected elsewhere.

Wired interlinked systems connect alarms using a dedicated cable, while wireless fire alarm systems use radio signals to communicate between units. Wireless systems are quicker to install and less disruptive to fit in existing homes, though the batteries in each unit will need regular checking. The average supply cost for a linked or wireless alarm is around £20 per unit.

Pros

✔ All alarms sound simultaneously — the whole building is alerted
✔ Wireless fire alarm systems are quicker and less disruptive to install

Cons

✖ Wireless systems require periodic battery checks and replacement
✖ Radio interference can occasionally affect wireless systems

Building Regulation for Fire Alarms

Building regulations require smoke/heat/fire alarms to meet current standards (BS 5839-6) and be interlinked. In new homes this is usually mains-powered with battery back-up, but sealed battery units are acceptable in some situations.
If you have other work on your home that is subject to building regulations, your alarms may need to be brought up to current standards.
If you want battery-powered alarms in addition to a mains-powered alarm, that is fine but they should be interlinked and provide the required coverage.
Since electrical work in your home should be carried out by a Part P competent, registered electrician, this will also affect the installation of your alarms.
Building regulations also cover placement. There must be at least one alarm in each circulating space, so one within each hallway of your home.
This is the minimum requirement, but more alarms may be necessary to ensure you are fully covered and protected. If you are unsure, ask your local fire station.

Cost of Removing a Fire Alarm

If you're upgrading to a new fire alarm system, you may need to remove the existing one first. For battery-powered alarms, this is a simple DIY task — unscrew the unit from the ceiling and patch the fixing holes.

Removing a mains-wired system is best left to an electrician. Costs will depend on the number of alarms and the complexity of the wiring, with electricians typically charging £50 to £120 per hour depending on location.

There is no cost for disposing of old smoke alarms, as you can just take them to your local recycling centre or tip in the specialist electronics disposal section.

Checklist: Hiring a Fire Alarm Installer in the UK

When looking for someone to install a fire alarm system in your home, you have two options. You can either use a specialist fire safety company or use an electrician.

You might choose a specialist fire safety company if your home has a complicated or unusual layout and you are looking for a comprehensive fire safety risk assessment and plan.

Whichever type of specialist you choose, there are a few things to look out for.

How much experience do they have with fire alarm installations? You're ideally looking for someone who has fitted the type of system you want to fit.
Are they Part P registered? Any electrician carrying out mains wiring work should be registered with a competent person scheme such as NICEIC or NAPIT so that they can self-certify that their work is compliant.
Will the installation BS 5839-6 compliant? Ensure your installer understands the current UK domestic fire safety standard and can confirm the completed system will comply.
Do they have positive reviews? Check their MyJobQuote profile to find feedback from other homeowners. Look for consistent comments on quality of work, reliability, and how any issues were handled.
Do they have public liability insurance? It's not a legal requirement, but you'll want your installer to have public liability insurance in case something goes wrong during the job.

It's always worth speaking with a few different fire alarm isntallers and comparing their prices before making a hiring decision.

Even if the first offer you get seems reasonable, getting at least 3 quotes from local electricians helps you weigh up your options.

FAQs

How often do you need to replace a fire alarm?

Most domestic smoke alarms should be replaced every 10 years, as the sensors become less reliable over time. When you get these installed, you should check the manufacturer's label for the specific replace-by date and make a note of it somewhere.

Fire alarms should be tested regularly and replaced sooner than 10 years if they fail tests, are damaged, or show a fault.

How often do fire alarm systems need to be tested?

At least once a month is recommended for fire alarm systems in domestic properties. Simply press test button to make sure the alarm sounds correctly.

To keep in line with fire safety regulations in rented or commercial properties, testing may need to be carried out several times per month, with businesses typically carrying out weekly alarm tests and keep a record of these checks.

In addition to regular testing, fire alarm systems should be serviced by a qualified professional at least once a year.

Where should smoke alarms be placed in a home?

As a minimum, UK building regulations require at least one smoke alarm on each floor of your home, positioned in a circulation space such as a hallway or landing.

For better protection, most fire safety professionals recommend also fitting a heat alarm in the kitchen, a smoke alarm in the living room, and an alarm in any bedroom used by a heavy sleeper. Alarms should be mounted on the ceiling, away from corners, light fittings, and bathroom doors where steam could trigger false activations.

Can I install a fire alarm myself?

Battery-powered alarms are straightforward to fit yourself. You'll just need to screw the base to the ceiling and insert the batteries (no professional is required).

Mains-powered alarms are a different matter. Because the work connects to your home's electrical supply, it must be carried out by a Part P registered electrician. Attempting mains electrical work yourself without the correct qualifications is unsafe and may invalidate your home insurance.

Can I get a free fire alarm from my local council?

Some local fire and rescue services offer free smoke alarms or home fire safety visits to eligible residents. The eligibility is needs-based and varies by region, so you'll need to contact your local fire station to find out what's available in your area.

Do fire alarms need annual servicing?

For domestic properties, annual servicing by a professional is recommended but not a legal requirement. A service check ensures all sensors are functioning correctly, batteries are in good condition, and the system still meets current safety standards.

For rented properties and HMOs, regular professional servicing is strongly advised and may be required by your insurer. Commercial properties are also legally required to have their fire alarm systems inspected and maintained by a competent person at regular intervals.

What is the difference between a smoke alarm and a fire alarm?

A smoke alarm detects smoke or airborne particles and triggers an alert in that unit. A fire alarm typically refers to a more complete system — often including multiple detector types (smoke, heat, CO) and interlinked alarms across a property.

The terms are sometimes used interchangeably, particularly for domestic settings, but a fire alarm system generally offers broader coverage than a single standalone smoke alarm.

Are fire alarms legally required in UK rental properties?

Yes. Private and social landlords in England are legally required to install at least one smoke alarm on every floor of a rental property, and a carbon monoxide alarm in any room with a fixed combustion appliance (excluding gas cookers). Failure to comply can result in a significant fine.

Houses in multiple occupation (HMOs) are subject to stricter requirements, and landlords should check the specific rules that apply to that property type.