Gone are the days when you can leave your front door unlocked. Now, property owners rely on security cameras, video doorbells, and multi-layered security systems to keep their families safe.
You want to deter intruders, something that’ll spook them and get them to leave your place alone. But how do you choose which to get?
Don’t worry, we’re here to get you started. We gathered the best alarm system installers in London to help you find a reliable, tailored setup that gives you peace of mind.
How much does an alarm system cost in London?
The cost of an alarm system in London typically ranges from £150 to over £3,500, depending on the setup and brand. Fully integrated networks are usually priced higher, reaching over £1,500.
| Alarm Type / Category | Estimated Installed Cost | Key Inclusions |
| DIY / Bell-Only | £150 – £500 | Self-installed units or local sirens with no monitoring |
| Wireless Security | £500 – £1,200 | Sensors, keypad, siren, and mobile app integration |
| Wired Security | £800 – £1,800 | Concealed cabling for long-term reliability |
| Smart Home Systems | £1,000 – £2,500+ | Smartphone control, device sync, and video options |
| High-Security Packages | £1,500 – £3,500+ | Comprehensive alarms and CCTV (Closed-Circuit Television) |
How We Reviewed
Equipment Quality and Reliability: We evaluated hardware durability, sensor accuracy, and overall build standards of each security network. Reliable devices prevent false triggers whilst ensuring robust intruder detection.
Monitoring and Response Features: We assessed how quickly systems alert owners or emergency services during a security breach. Professional monitoring and police response options offer peace of mind.
Installation and Integration Options: We checked whether providers offer flexible wired, wireless, or hybrid setups tailored to different property types. Seamless app integration and smart home compatibility were key focus areas.
Pricing Transparency and Value: We reviewed overall costs, contract transparency, and ongoing fees to ensure fair value for money. Clear pricing helps homeowners and landlords avoid unexpected maintenance bills.
1. Spy Alarms
Website: https://www.spyalarms.co.uk/
Address: Unit 6, Ravensquay Business Centre, Cray Ave, Orpington
Contact: 01689 887 626
Hours: Monday – Friday: 8:30 AM – 5:00 PM
Spy Alarms provides residential and commercial burglar alarms across London. Their insurance-approved intruder systems integrate seamlessly with 24/7 monitoring and police response to safeguard properties of all sizes and layouts.
They provide tailored solutions, where you can nominate trusted keyholders for their team to dispatch in the event of an alarm. You can even include police and fire service response.
Their turnaround times are fast, with a one-day installation for their intruder alarm system. It doesn’t include wires, so the whole setup is clean, and you can integrate it with your smart home system.
On the downside, residential clients frequently compete with busy commercial projects for booking slots.
Customer Reviews
Our business relationship works well
Foreman Bros Ltd is a family owned business in the motor sales & service sector. Spy group provide cover for our alarm, CCTV and fire extinguisher needs. The customer support has been excellent from quote to installation and teething call outs. Someone is always available for queries, including our account manager Ava, who is always keen to ensure the support is prompt and appropriate to our needs. Our business relationship works well, reducing our contact/contract points and has proven very price competitive to boot!
- Jamie Foreman | Google Review
We decided to switch to Spy & we are very happy we did
We had been experiencing difficulties with our old alarm system.
We were due to renew, but we weren’t happy with the old service.
We decided to switch to Spy & we are very happy we did. Service has been really good. Girls on the Kent help desk were super friendly & helpful.
- carly lawrence | Google Review
2. London Car Alarm Co
Website: https://www.londoncaralarmco.com/
Areas Served: London, Hertfordshire, Essex, Buckinghamshire, and Bedfordshire
Contact: 0208 906 0478
Hours: Monday – Saturday: 8:00 AM – 8:00 PM
London Car Alarm Co has been providing bespoke vehicle security since 1990. They’re highly accessible, serving London and the surrounding areas seven days a week.
They deliver advanced protection for cars and vans with specialised platforms like the Keetec BLADE system, which provides high-grade anti-theft security against keyless entry hacks.
Their tailored installations feature Controller Area Network (CAN-BUS) compatibility, wireless immobilisation relays, GPS tracking, and sophisticated driver recognition for overall peace of mind.
Their skilled technicians even smoothly integrate smart authorisation methods into existing factory remotes and mobile applications.
On the downside, their security solutions focus entirely on vehicles rather than residential properties.
Customer Reviews
Recommend them to anyone looking for a reliable and professional car alarm service
I’m very happy with the service from The London Car Alarm Company Ltd\! Professional team, excellent customer service, and high\-quality work\. Everything was done quickly, neatly, and exactly as promised\. I’m very pleased with the result and would definitely recommend them to anyone looking for a reliable and professional car alarm service\.
- Oleksandr Tyshchenko | Google Review
Soo grateful I found this company online
Soo grateful I found this company online I have a StarLine 2 fitted to our van which I thought had run out of credit Otto was able to tell me the name of the top up company for the sim and help me threw some other issues with the alarm system we have been experiencing I highly recommend him
- Louis Mayhew | Google Review
3. SatFocus Security Solutions
Website: https://www.satfocussecurity.co.uk/
Address: 41 Balmoral Rd, Harrow
Contact: 020 8422 7918
Hours: Monday – Friday: 8:00 AM – 6:00 PM; Saturday: 8:00 AM – 5:00 PM
If you need end-to-end security setup, SatFocus Security Solutions should be on your list. This service provides full smartphone app integration across wired, wireless, and hybrid alarm configurations.
We even got to test their mobile app for its remote monitoring capabilities, which was remarkably responsive when checking sensor statuses from anywhere in the world.
It’s worth mentioning that they’re authorised installers for leading industry brands like Hikvision, Texecom, and Ajax Systems. Because of this, they can provide highly accessible interfaces for most London homes.
The catch is that their wide regional service area can occasionally cause scheduling delays during peak hours.
Customer Reviews
He is professional, polite and efficient
Very happy and satisfied with the work carried out by Thiru.
We were at a loss as the setup for our alarm and CCTV were lost and we were not getting any assistance from the original installer.
Fortunately came across Thiru from an online search.
We called him based on the positive reviews and were glad we did.
He is professional, polite and efficient.
- Mahendra Luhar | Google Review
Booked installation a few days later, the alarm is now in installed
We contacted Thiru as we had an emergency with our house alarm. We made an appointment and he promptly can around the next day. Very knowledgeable about his solution, provided detailed quotation, which was very competitive. Booked installation a few days later, the alarm is now in installed. Very happy with solution and service. We have no hesitation in recommending Thiru at Satfocus.
- Robert Pinn| Google Review
4. Innert Security
Website: https://www.innert.co.uk/
Address: 60a Beverley Way
Contact: 07702 802915
Hours: Monday – Sunday: 8:00 AM – 8:00 PM
Innert Security stands out for straightforward, outright property protection. Their wireless panel comes with a hassle-free setup without messy connections.
Their versatile sensors effectively guard against burglary, flood, smoke, and panic emergencies without triggering false alarms when pets roam freely indoors.
We like their alarm systems, since they include a wide range of features. The PowerMaster-10 G2, for example, is designed for long-term efficiency, including two-way spread-spectrum communication that eliminates unnecessary signal chatter.
More importantly, they require zero ongoing monthly subscription fees. You won’t even have to worry about hidden charges.
We appreciate their seven-day-a-week availability. However, clients located in North East London often experience longer travel wait times.
Customer Reviews
Would highly recommend
Marcin came to redo our CCTV and alarm following a very poor installation from another company. I wish we had known of Marcin sooner. He was so professional, knowledgeable and really high attention to detail. Would highly recommend.
- Lisa Cook | Google Review
If I ever need alarm system installation I will be sure to use this company
He just saved me hundreds of pounds calling some specialist for a home visit to stop the alarm.
Worth to mention that I am not even a client of him and this gentleman just provide his free help for someone who was a complete stranger.
Big big big thumb up for such a nice person and I wish your business go very well. I am sure it will be.if I ever need alarm system installation I will be sure to use this company.
- xiaohui chen| Google Review
5. Securex Security & Fire
Website: https://securexsecurity.co.uk/
Address: 129 Colney Hatch Lane
Contact: 07848 247 247
Hours: 24/7
Securex Security & Fire is on our list for ensuring continuous safety across London. They provide round-the-clock video surveillance to keep your property safe all the time.
Their tailored security packages combine advanced intruder detection with CCTV monitoring and access control. This includes police-response alarms and fully compliant British Standard 5839 fire protection to safeguard your premises against every hazard.
Their emergency response capabilities are worth highlighting. Their team promptly handles control panel repairs, power supply failures, and false alarm investigations.
To boot, they offer flexible payment plans designed to ease budgeting concerns for property owners.
The drawback is that emergency call-outs require an upfront service charge, which can add to the total cost.
Customer Reviews
Highly recommend Securex to anyone
We used Alex from Securex to set up an alarm system in a residential property. Look no further for a professional who knows what he is doing, from start to finish – reliable, quick and highly organised. Made sure we were set up and informed on all aspects of the system in no time. Highly recommend Securex to anyone who’s looking for an alarm fitting for any setting.
- Simon Davidian | Google Review
Definitely deserves 5 stars
5 star service for an emergency call out. I’m currently away and my alarm decided to trip out.
I sent a txt at 11pm and the guy reply straight away, Gave me a price and was at my house within 40 mins and stopped the alarm. I highly recommend for any security problems you may have. Definitely deserves 5 stars.
- Danielle Whitelock | Google Review
