Google Nest · Doorbells
Google Nest Hello Installation in London
Updated
Nest Hello is the 2018 wired doorbell that Google's help pages now call Nest Doorbell (wired), the model before the wired 2nd and 3rd gen. Google no longer lists it among the devices it sells in the UK, so this page is for Hellos already on London doors: refitting one, sorting its power, or replacing it. A vetted JACK pro measures the bell supply, deals with the chime connector and gives you a fixed price in the JACK app before you book.
In short
Yes. A vetted JACK pro in London refits or replaces a Nest Hello. It is wired only, and for Europe Google asks for bell wires measuring 10.8–30 V AC, or a transformer labelled 12–24 V AC at 8 VA or more, which a common 8 V UK bell transformer does not reach. Replacing it with the Nest Doorbell (battery) reuses the same wires once the Hello's four-wire chime connector is taken out.
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Nest Hello: key facts
- Names
- Google's spec page lists it as 'Nest Doorbell (wired), also called Nest Hello' Source: Google Nest Help: camera and doorbell tech specs
- UK status
- Missing from Google's UK list of devices and services when checked on 1 November 2026 Source: Google Store Help: devices and services available in your region
- Power in Europe
- Bell wires measuring 10.8–30 V AC, or a transformer labelled 12–24 V AC at 8 VA or above Source: Google Nest Help: camera and doorbell tech specs
- Google's global range
- 12–24 V AC at 8–40 VA, in its doorbell compatibility table Source: Google Nest Help: Nest doorbell compatibility
- Chime connector
- Four wires; Google's later wired doorbells use two-wire connectors, and the Hello's is not compatible with them Source: Google Nest Help: Nest doorbell chime troubleshooting
- In the box
- Chime connector, two extension wires and a masonry drill bit Source: Google Nest Help: camera and doorbell tech specs
- Wi-Fi and weather
- 2.4 GHz Wi-Fi only outside the US; IPX4 Source: Google Nest Help: camera and doorbell tech specs
- Google's UK installation terms
- Installation covers the Hello, the chime connector and, if required, a replacement transformer; running new wires and replacing a doorbell that was not wired are excluded Source: Nest UK: doorbell installation terms
- Security updates
- Google's five-year minimum from its 2018 release has passed; Google still lists it as receiving updates (checked 1 November 2026) Source: Google: security updates for Google's connected home devices
Device facts come from Google Nest Help (UK), the Google Store UK and Google's UK installation guide, linked beside each fact. Several Nest models are out of stock or no longer sold in the UK, so these pages are written for the device you already own: check its name on the box, in the app or on its base, and send it with your request. Last checked 1 November 2026.
How the Nest Hello is powered and mounted
The Hello draws all its power from the bell circuit, so the transformer matters more than it does for a battery doorbell. Google's figures for Europe are 10.8–30 V AC measured at the wires, or a transformer labelled 12–24 V AC at 8 VA or more. Plenty of UK bell transformers are 8 V units, which sit below that floor, so the pro measures the supply at the wires before anything else is decided.
Changing an 8 V transformer for a 12 V or 24 V one, on the same fused spur or circuit, counts as a replacement in England: it is mains work, but it is not notifiable. Ask your pro for a Minor Electrical Installation Works Certificate for that part. Fitting one on a spare way in the fuse board is different: that is a new circuit, notifiable work for a registered electrician that JACK does not take on.
With the Hello gone from Google's UK list, many owners replace it rather than refit it. The bell wires that fed the Hello can feed a Nest Doorbell (battery) too, as long as the transformer gives the battery model's 10 VA. The Hello's four-wire chime connector comes out from inside the chime during the swap, and the new doorbell is set to ring the chime from the app.
What the pro checks first
- The AC voltage measured at the doorbell wires, against Google's 10.8 V floor for Europe
- Where the transformer is: inside the chime, on a fused spur, or in the consumer unit
- The chime connector inside the chime, and whether the chime is mechanical or electronic
- The 2.4 GHz Wi-Fi signal at the door
- Whether you want the Hello refitted or replaced with the battery model
What the pro does on the Nest Hello
- Bell circuit isolated before the chime cover or transformer is opened
- An 8 V transformer changed for a 12 V or 24 V one where you agreed it, added at cost
- Hello refitted on its plate, or taken down to make way for the battery model
- Four-wire chime connector checked and refitted, or removed if the Hello is being replaced
- Doorbell joined to 2.4 GHz Wi-Fi and the chime tested with a press
- For any 230 V transformer work, ask your pro for a Minor Electrical Installation Works Certificate
How the Nest Hello installation goes
- 1Your photos of the doorbell, chime and transformer checked before the visit
- 2Voltage at the doorbell wires measured with the bell circuit live
- 3Bell circuit isolated before any transformer or chime work
- 4Transformer replaced where agreed, and the chime connector refitted or removed
- 5Hello, or the battery doorbell replacing it, fixed back on and powered up
- 6Wi-Fi, chime and alerts tested in the app
Before you book: what to send
- A photo of the Hello on the door frame, and of the chime with its cover on
- A photo of the transformer label, wherever the transformer is
- Whether you want the Hello refitted or replaced, and which doorbell you have for it
- Where the router is in relation to the front door
How is Google Nest installation priced in London?
A vetted pro prices your Nest job from the model and your photos, and the JACK app shows that fixed price before you book.
Full pricing guide for Google Nest installationFrequently asked questions
What can replace a Nest Hello in the UK?
The only Nest doorbell Google lists for the UK is the Nest Doorbell (battery), and it can run off the Hello's bell wires if the transformer gives 10 VA. Google does not sell the wired 2nd or 3rd gen Nest doorbell in the UK; an imported one needs a 16–24 V AC transformer of 10–40 VA.
Will a Nest Hello work on an 8 V transformer?
Google's European spec asks for at least 10.8 V AC measured at the wires, or a transformer labelled 12–24 V AC at 8 VA or more, so an 8 V transformer falls short. A 12 V or 24 V transformer on the same supply is the usual fix.
Why does Google say a licensed electrician should fit a new transformer?
It is Google's instruction for the Nest Doorbell (wired, 2nd gen) in Europe and Australia: its help says a licensed electrician must fit a new transformer before that doorbell goes in. The sentence names the 2nd gen, not the Hello, and England has no licence for electricians in law: replacing a bell transformer on its existing supply is not notifiable under Part P. It is still mains work, so ask your pro for a Minor Electrical Installation Works Certificate.
How much does Google Nest Hello installation cost in London?
It is a fixed price for your Nest Hello, worked out by a vetted pro from the model, a photo of where it is going and what power is there now, and shown in the JACK app before you book. Other devices can go on the same booking for one price. If you would rather pay for time, hourly hire for smart home is typically £45–£95 per hour as a guide.
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All Google Nest installation guides
Google Nest installation in London: thermostats and Heat Links, doorbells, Nest Cams and Nest Protect fitted by vetted pros. See a fixed price first.
Related services in London
Sources
The device facts and rules on this page come from these pages, checked on 1 November 2026.
Jack All Trades (JACK) is an independent London service for booking vetted local pros. It is not part of, affiliated with or endorsed by Google LLC, and it is not part of Google's Nest Pro programme. Google Nest product names are used only to describe the devices JACK pros install; prices are set by JACK pros, not by Google, and JACK does not sell Nest devices. JACK pros do not open boilers or claim Gas Safe registration.
Get your Google Nest device fitted
Tell JACK the Nest model and add photos of the boiler and old controls, the door, or the wall. A vetted pro prices it, and you pick the day only once you are happy with that price.
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