Security & smart building
In short
Best overall: Shelly Pro 1, £44.55 at Shelly UK. Best value: Shelly Plus AddOn +1DS, £14.51. Premium pick: Shelly Pro 3, £62.91.
Across the 52 matching listings we screened from 1 UK suppliers, most cost £18–£70 and the middle price is £43. Prices checked 27 October 2026.
Smart plugs and wired smart relays let landlords and offices schedule heating, switch off kit remotely and monitor energy use. This shortlist compares smart relays, plugs and energy meters from UK supplier feeds, so you can see the market spread across plug-in and DIN-rail options.
Smart plug reviews focus on apps and voice assistants. Below we cover what they skip: when a wired relay needs an electrician in England, load limits, and product security law.
| # | Product | From | |
|---|---|---|---|
| 1 | Best overall Shelly Pro 1 | £44.55 | Details |
| 2 | Shelly Wave Pro 1 | £56.70 | Details |
| 3 | Premium pick Shelly Pro 3 | £62.91 | Details |
| 4 | Shelly Pro RGBWW PM | £42.21 | Details |
| 5 | Shelly Plus Smoke Alarm | £40.41 | Details |
| 6 | Best value Shelly Plus AddOn +1DS | £14.51 | Details |
| 7 | Ogemray Smart relay 25A | £26.55 | Details |
| 8 | Shelly EM Gen3 | £55.71 | Details |
1 · Best overall
3800235268001 · Sold by Shelly UK
1-phase, 1-channel relay with potential-free outputs (dry contacts), supporting up to 16A for professional lights and appliance automation for residential or commercial use.
2
3800235269091 · Sold by Shelly UK
1-channel DIN rail Z-Wave smart switch with dry contacts, supporting up to 16 A, designed for professional lights and appliance automation in residential or commercial use.
3 · Premium pick
3800235268094 · Sold by Shelly UK
3-channel relay with potential-free outputs, supporting a total of 48A for professional automation of residentials or commercial use. Control temperature or lights automation in large spaces.
4
3800235268216 · Sold by Shelly UK
Our first DIN-rail mountable, five-channel smart light controller for managing adjustable white channels (CCT) and 5 LED strips independently. Featuring power measurement that allows real-time track of the voltage, current, and power consumption.
5
3800235265642 · Sold by Shelly UK
Wire-free, battery-operated smart photoelectric smoke alarm with high sensitivity - use it to constantly monitor your home for any smoke and keep your property and family safe, wherever you are.
6 · Best value
3800235264355 · Sold by Shelly UK
Galvanically isolated sensor interface compatible with specific Shelly Plus, Gen3 & Gen4 devices..Use it to measure temperature or connect various analog and digital sensors for more advanced automations (e.g.
7
3800238070885 · Sold by Shelly UK
Smart relay powered by Shelly, designed for precise control of large appliances up to 25A / 6000W. Equipped with power measurement and full Shelly capabilities, it lets you monitor and optimize energy use in homes or industrial spaces.
8
3800235261873 · Sold by Shelly UK
Gain real-time insights into the power consumption of your connected devices with Shelly EM Gen3. By monitoring the energy usage as it happens, you can uncover patterns that reveal opportunities for efficiency.
A plug-in smart plug needs no electrical work. A DIN-rail or in-wall relay is part of the fixed wiring. In England, Approved Document P covers electrical safety in dwellings. Bath and North East Somerset Building Control explains that adding a new circuit, and work in special locations such as rooms with a bath or shower, must be notified or done by a registered competent person, while small jobs such as replacing a socket or light switch do not need notifying.
Use a qualified electrician for wired relays and ask for a certificate for the work. The fixed installation is checked again at the five-yearly electrical inspection required for private lets in England.
Check the rated maximum load of a plug or relay against the appliance before you switch heaters, water heaters or pumps. Electrical Safety First notes most extension leads are rated 13A, some older leads and cable reels less, and warns against plugging one extension lead into another.
In an HMO, LACORS fire guidance prefers fixed heating to portable heaters, so a wired relay on a fixed heater is a better long-term option than a smart plug on a plug-in heater.
Since 29 April 2024, UK product security law bans universal and easily guessed default passwords on consumer connectable products and requires manufacturers to publish a minimum security update period. The NCSC lists smart plugs, thermostats and light bulbs among smart domestic appliances covered. Check the stated update period before buying.
If tenants control devices, remove their app access at the end of each tenancy and reset shared accounts. A smart smoke alarm does not replace the alarm system an HMO needs: LACORS says battery-only alarms are not recommended in HMOs and multiple alarms must be interlinked.
On our shortlist, the Shelly Pro 1 is the best overall pick at £44.55 from Shelly UK. For a tighter budget, the Shelly Plus AddOn +1DS (£14.51) is our best-value choice.
Most of the 52 UK listings we screened sit between £18 and £70, with a middle price of £43. Trade suppliers often show prices before VAT, so add 20% if you can't reclaim it.
A VAT-registered business can usually reclaim the VAT on equipment bought for business use, as long as it holds a valid VAT invoice from the supplier. Ask the seller for one at checkout.
The picks here come from Shelly UK. Most UK trade suppliers offer next-day delivery and VAT invoices; some offer credit accounts for regular orders.
Yes, but a wired relay is fixed electrical work. In England, use a qualified electrician, and use a registered competent person where the work is notifiable under Part P.
Only if the plug's rated load covers the heater. Plug it straight into a wall socket, not an extension lead, and follow the heater maker's instructions.
Consumer smart plugs sold in the UK must meet the product security regime from 29 April 2024, including no universal default passwords and a published security update period.
Not on its own. LACORS guidance says battery-only smoke alarms are not recommended in HMOs, and HMOs usually need interlinked mains alarms with battery backup.