How Much Does a Home Security System Cost? UK Prices for 2026

Two quotes land on the same kitchen table: £312 for a kit off a shelf, £1,940 for an engineer to spend a day in the house. Both can be entirely reasonable, because they are not the same product doing the same job. Most of the confusion here comes from comparing a self-monitored DIY kit against a certificated, police-response installation as though the only difference were the badge on the box.

So before the numbers help, work out which of six quite different problems you have. Buy for the wrong one and you can spend £1,200 on kit that does nothing about the thing bothering you at 3am.

Ask what you would want to have happened on the night it goes wrong. The answers split cleanly, and each has its own price band.

• •Deterrence — you want opportunists to pick another house. A live external sounder, motion lighting and a visible doorbell camera: £70 to £290, no ongoing cost.
• •Detection — you want to know the moment a door opens while you are at work. Panel, contacts and PIRs pushing alerts to your phone: £200 to £1,300, depending who fits it.
• •Evidence — you have repeated damage, fly-tipping or a boundary dispute. Two to four cameras at 2K or better with recording: £160 to £700.
• •Response — you are away for weeks and nobody nearby can attend. No amount of camera resolution fixes this. Alarm receiving centre monitoring with keyholder or police response: hardware plus £180 to £480 a year, indefinitely.
• •Compliance — your insurer has asked for an alarm in writing. NSI or SSAIB certificated to BS EN 50131 Grade 2 with a maintenance contract: £700 to £1,600, plus £110 to £220 a year.
• •Access control — you are tired of cutting keys for cleaners and dog walkers. Not security at all, and the cheapest problem here to solve.

Those categories overlap, but they are listed roughly in the order people get them wrong. If the real irritation is key handovers, a smart lock at around £230 fixes it and a £1,400 alarm does not. Every figure below includes VAT — domestic security work is standard-rated at 20%, whatever a salesperson implies about reduced rates.

• •Self-monitored DIY kit, five to eight devices: £180 to £420 upfront, £0 to £100 a year if you add cloud video storage.
• •DIY kit with professional monitoring bolted on: £250 to £500 upfront, £180 to £420 a year on a rolling contract you can leave.
• •Subscription-model installed alarm, the doorstep-sales route: £0 to £250 upfront but £30 to £48 a month on a 36-month minimum. That is £1,080 to £1,730 over the term, and you usually never own the equipment.
• •Certificated wireless Grade 2 alarm, supplied and installed: £650 to £1,300 for a three-bed semi, £1,300 to £2,200 for a four or five-bed with outbuildings.
• •Full package — alarm, four cameras, smart lock, external lighting, monitored: £2,200 to £3,800 upfront and £400 to £700 a year.

On a professionally installed wireless system, labour is 40% to 55% of the total. Engineer day rates run £280 to £420 in London and the South East, £200 to £320 elsewhere, and a three-bed wireless install is a four to six hour job for one person.

Wired systems are the exception: chasing cable through a 1930s semi with solid walls and no accessible loft can push labour past 65%, which is why the wired versus wireless choice is a cost decision before it is a technical one. Cameras are the other place labour bites — cabling to a gable end is a tower-scaffold job, so fitting cameras yourself at ground-floor height is where most people save real money.

That makes the hardware below the smaller half of a fitted quote, and the whole of a DIY one. Ask any installer to itemise against these lines. Prices are UK retail; add roughly 20% if the installer supplies the kit, which is normal and buys a warranty they will honour.

• •Control panel and keypad: £90 to £220
• •Door or window contact: £18 to £35 each
• •Pet-tolerant PIR detector: £25 to £45 each
• •Live external sounder: £60 to £140 (a dummy box is £12 and worth about what you pay)
• •Video doorbell: £50 to £190, plus £35 to £90 if there is no existing bell transformer
• •Outdoor camera, 2K, battery or mains: £70 to £180 each
• •Network recorder with a 2TB drive: £150 to £300
• •Retrofit smart lock on a euro cylinder: £150 to £340, plus £70 to £140 for a locksmith to fit it
• •Cloud video subscription: £3 to £8 a month per camera, or £8 to £16 for a whole-home plan
• •Annual service visit, needed to keep monitoring and most insurance endorsements valid: £90 to £160

Floor area is a poor predictor. Installers price on protected openings, which is why two houses of identical size can be £400 apart on the same specification.

• •Openings, not square metres. A semi with a side return, patio doors and an integral garage needs 11 to 13 devices; a mid-terrace of the same size needs seven.
• •Certification. NSI and SSAIB registered firms charge 15% to 25% more than an unregistered local fitter — and that premium is the entire point if an insurer is involved.
• •Police response. It needs a Unique Reference Number, which only a certificated installer can apply for, plus continuous monitoring. Budget a £45 to £90 one-off police fee and a higher tariff.
• •Region. London and the South East run 20% to 30% above these figures; the North East, Wales and much of Scotland sit 10% to 15% below.
• •Building fabric. Thick stone or rubble-filled walls destroy wireless range, and repeaters are £45 to £80 each.
• •Listed status or a conservation area — sounders and cameras on a protected frontage may need consent, and the obvious position is often the one refused.
• •Contract structure. Rented equipment almost always costs more over five years than buying outright, even when the monthly figure looks kinder.

The insurance discount, incidentally, is rarely the reason to do this. A certificated Grade 2 alarm knocks perhaps 3% to 7% off a combined buildings and contents premium — on £420, that is £13 to £29 a year. What matters is that the certificate and service records exist if you claim: filing a home insurance claim goes badly when an alarm endorsement has quietly lapsed for want of a £120 service.

• •Two-bed rented flat, Manchester, self-monitored. Five-piece wireless kit £229, two extra contacts £54, battery doorbell £99. Upfront £382, cloud plan £80 a year. Year one £462 — no labour, no contract, and it all comes with you when you move.
• •Three-bed semi, Derby, insurer wants certification. SSAIB installer, wireless Grade 2: panel, keypad, six contacts, three PIRs, sounder — £940 fitted, roughly £430 materials against £510 labour. Keyholder monitoring £22 a month, annual service £120. Year one £1,324, then £384 a year.
• •Four-bed detached, Surrey, alarm plus cameras plus access. Monitored Grade 2 alarm, 14 devices, £1,650; four 2K cameras and a 4TB recorder installed £1,180; smart lock fitted £310; two PIR floodlights £240. Upfront £3,380, monitoring with police response £34 a month, service £150. Year one £3,938.

A single-line quote is not a quote. Work through this before signing — and if you have not walked the house properly yet, the home security checklist will tell you how many devices you ought to be quoted for.

• •Insist on itemisation per device. "Full system, £1,499" hides both the specification and the labour.
• •Get the grade and standard in writing. PD 6662 and BS EN 50131 Grade 2 is the domestic norm; "insurance approved" with no grade named is marketing copy.
• •Verify the NSI or SSAIB registration on the issuing body's own register, not the installer's website.
• •Establish ownership. Do you own the kit at the end of the term, and does it still work if you stop paying? Some subscription hardware simply stops.
• •Ask for the total over the minimum term, not the monthly figure. £39 a month reads smaller than £1,404.
• •Take three quotes and expect the middle to be about right. One 40% under the others is usually fewer sensors, not a better deal.
• •Treat a two-hour doorstep pitch and a discount expiring tonight as the warning they are. Off-premises contracts carry a 14-day cancellation right under the Consumer Contracts Regulations.

Figures come from quotes collected from NSI and SSAIB registered installers across five UK regions in early 2026, current UK retail hardware pricing, and published monitoring tariffs, all including VAT. They assume an occupied existing property with mains power and reasonable broadband — not a new build or a barn conversion, where cable runs cannot honestly be priced from a desk.

Two things date fastest: monitoring tariffs, up 8% to 12% a year since 2023, and cloud video plans, restructured mid-contract by more than one manufacturer. Re-check both against the provider's current pricing page, and judge the five-year total rather than the sticker.