Intruder alarm installation with optional professional monitoring
Intruder Alarms and Monitoring
Intruder alarm installation covers fitting a system of door and window contacts, motion sensors and a control panel that detects unauthorised entry, with an option to connect the system to a 24-hour monitoring service that can alert keyholders or the police.
Definition
What Alarms & Monitoring covers
A domestic or commercial intruder alarm uses sensors — door and window contacts, motion detectors, or a combination — connected to a control panel that sounds an alarm and, where specified, sends an alert to your phone or an alarm receiving centre. Monitored systems add an ongoing connection to a monitoring provider who can respond to an activation, which some insurers require for higher-value contents or specific property types.
Suitable for
- Homes and businesses wanting a self-monitored or professionally monitored intruder alarm
- Meeting an insurer's requirement for a monitored alarm system
- Replacing or upgrading an old or unreliable existing alarm
- Integrating alarm sensors with an existing CCTV or smart home system
Not suitable for
- Fire and smoke detection — see our fire and smoke alarms service, which uses different sensor types and standards
- CCTV-only requirements with no intruder detection sensors — see our CCTV and security service
Process
How the work is carried out
- 01
Site survey
Assessing vulnerable entry points and the best sensor layout for the property.
- 02
System design
Agreeing sensor type and number, wired or wireless, and whether the system will be professionally monitored.
- 03
Installation
Fitting the control panel, sensors and any signalling equipment for monitoring.
- 04
Commissioning
Testing the system, setting up user codes, and registering with a monitoring provider where specified.
Typical timescale
A standard wireless alarm installation is typically completed within a day; wired systems and larger commercial installations take longer.
Cost guidance
Intruder alarm installation typically costs £400–£1,000 per job in our area, with the number of sensors and wired versus wireless design affecting the price. We provide an itemised quotation after a site visit rather than a fixed headline price. Optional 24-hour monitoring is a separate ongoing monthly subscription rather than a one-off cost.
Limitations and exclusions
- Monitored alarm systems require an ongoing monthly subscription with the monitoring provider, separate from the installation cost
- False alarm policy and any police response level is set by the monitoring provider and local police force, not by us
- Existing wiring, where reused, is assessed for condition during the survey rather than assumed suitable
Areas we cover
Alarms & Monitoring across Sussex, Surrey, Kent and South London
Local property styles, planning authorities and neighbourhood coverage for alarms & monitoring in each town we work in.
Related services
You may also need
FAQs
Alarms & Monitoring FAQs
What's the difference between a monitored and unmonitored alarm?
A monitored alarm connects to a 24-hour alarm receiving centre that can alert keyholders or, in some cases, the police when it activates. An unmonitored alarm sounds locally and may send an app notification, but there's no third-party response service behind it.
Does my insurer require a monitored alarm?
Some insurers require a monitored alarm for higher-value contents or particular property types — check your policy wording. We can install to meet the standard your insurer specifies where you confirm the requirement.
Can an alarm system be combined with CCTV and smart home controls?
Yes, this is a common combination, and we can specify sensors and control systems that work alongside an existing or new CCTV and smart home installation.
Discuss your alarms & monitoring project
Tell us about the property and what you have in mind, and we'll arrange a site visit.
Last reviewed 2026-07-28.