One of the first decisions you face when installing a new burglar alarm is whether to choose a wired or wireless system. Twenty years ago the answer was almost always wired, because wireless systems were unreliable and expensive. Today, both technologies are mature, and the right choice depends more on the property and how much disruption you are willing to accept during installation than on the technology itself.
This guide explains how each type works, where each one performs best, and what we typically recommend for different kinds of homes across Essex and Greater London.
How a Wired Alarm System Works
A wired, or hardwired, alarm system connects every sensor, keypad, and sounder back to the control panel using cabling run through walls, ceilings, and floors. Power and signal travel down the same cables. Detection is instantaneous and there are no batteries to change in individual devices.
Wired systems have been the professional standard in the UK for decades. They are still the first choice for new builds, major refurbishments, and commercial installations where cable runs can be planned in advance and hidden neatly within construction.
How a Wireless Alarm System Works
A wireless system uses radio-frequency signals, typically in the licence-free 868 MHz band in the UK, to communicate between sensors and the control panel. Each sensor has its own battery, usually a long-life lithium cell that lasts three to five years under normal use. The panel is mains-powered with a backup battery.
Modern wireless systems use supervised, encrypted, two-way communication. The panel regularly checks in with each sensor. If a sensor fails to respond, the panel reports a fault. This supervision addresses the reliability concerns that dogged early wireless systems.
Installation: Disruption and Time
Installation is the single biggest practical difference between the two technologies.
- Wired systems involve lifting carpets, drilling into walls and joists, and running cables through loft spaces and under floorboards. In an occupied home this is messy. A typical domestic installation takes one to two days, longer for larger properties, and some redecoration may be needed after the work is complete.
- Wireless systems need only a mains power supply for the control panel. Sensors mount to walls with screws or adhesive and are paired with the panel in software. A full installation in an average three-bedroom house can usually be completed in half a day with minimal disruption and no decoration damage.
For an occupied home where the owners want a new alarm installed without lifting floors and redecorating afterwards, wireless is almost always the better choice. For a property undergoing renovation or new construction, wired makes sense because the cable runs can be planned into the build.
Reliability and False Alarms
Reliability used to be the strongest argument for wired systems. A physical cable cannot be jammed, cannot run out of battery, and cannot drop out of range. Modern wireless systems have closed much of that gap, but not all of it.
In practice:
- Wired systems have a slight edge in pure signal reliability, with no battery or radio dependencies in the sensors themselves.
- Wireless systems can be affected by heavy radio interference in rare cases, and they depend on the sensors' batteries being replaced on schedule.
- Both technologies produce similar numbers of false alarms in practice, because most false alarms are caused by pet movement, insects, air currents, and poor detector placement rather than by signal failure.
For standard domestic and SME use, both technologies easily meet the reliability requirements of BS EN 50131 Grade 2 and Grade 3 systems. The British and European standards now explicitly recognise wireless as equivalent to wired when supervised communication and appropriate battery monitoring are in place.
Battery Life and Ongoing Maintenance
Wireless sensor batteries typically last three to five years. The control panel monitors battery voltage and reports a low-battery warning well before any sensor actually fails. During annual servicing, the installer can check reported voltages and replace any cells that are approaching end of life.
Wired systems do not need battery changes at the sensor level, but the control panel still has a backup battery that needs replacing every three to five years. Both types of system require the same annual service to meet insurance and inspectorate requirements.
Running costs are therefore similar. A wireless system may need more battery changes over a 10-year period, but the cost of the cells themselves is small and replacement takes minutes rather than hours.
Cost Comparison
There is no universal answer to which technology is cheaper, because the cost of a wired installation depends heavily on the property. In a new build or empty property, wired is often slightly cheaper than wireless because the equipment itself is lower cost. In an occupied, carpeted, and decorated home, wired becomes more expensive because of the labour involved in running cables without damaging the property.
| Property Type | Wired Installed Cost | Wireless Installed Cost |
|---|---|---|
| Three-bed detached, occupied, carpeted | £900 to £1,400 | £650 to £1,000 |
| Four-bed new build, pre-decoration | £700 to £1,100 | £800 to £1,200 |
| Small commercial unit (200 sqm) | £1,200 to £2,000 | £1,100 to £1,800 |
These are typical ranges for the Essex and Greater London market in 2026 and assume a Grade 2 system. Grade 3 adds roughly 15 to 25 per cent. Monitoring and maintenance contracts are charged separately.
Which Type Fits Which Property
Based on our experience installing alarms across Essex and Greater London, here is how we typically advise clients:
- Occupied Victorian and Edwardian homes in areas like Brentwood, Woodford, and South Woodford tend to favour wireless, because lifting parquet floors and running cables through solid walls is disruptive and expensive.
- New build and modern estate homes in places like Chelmsford and Basildon can go either way. If the wiring is being done at first fix during construction, wired is cost-effective. After handover, wireless is usually less intrusive.
- Flats and apartments almost always use wireless, because running cables between rooms in a flat without damage is difficult and in some leaseholds it is not allowed at all.
- Commercial units and offices vary: large warehouses with long cable runs often prefer wired for cost, while smaller offices and retail units usually prefer wireless for speed of install.
- Listed buildings almost always require wireless because drilling into historic fabric is restricted by listed building consent.
A Note on Hybrid Systems
In many real installations, the answer is not wired or wireless but both. Hybrid systems use wireless sensors where cabling is impractical and wired sensors where cables can be run cleanly. The control panel supports both types simultaneously. Hybrid is increasingly our default approach in older homes with awkward layouts.
Making the Decision
If you are choosing between wired and wireless for an Essex home, the practical questions are straightforward:
- Is the property occupied and decorated? If yes, wireless is usually the better choice.
- Is there an insurance condition that specifies a particular grade? Both technologies can meet Grade 2 and Grade 3, so the grade itself does not force your hand.
- Is there any constraint on drilling, such as a listed building designation or a strict leasehold? If yes, wireless is essentially the only option.
- Is this a new build or refurbishment? If yes, wired may offer a small cost saving, assuming the cables can go in before plaster and decoration.
At J&L Security, we install both wired and wireless systems across Essex and Greater London, and we regularly fit hybrid systems where it is the best fit for the property. Every installation is SSAIB approved, certified to BS EN 50131, and supported by our ongoing maintenance service.
If you would like a free survey and a written recommendation for your property, contact us or call 0204 538 5925. You can also read more about our burglar alarm services or explore our other guides.