Nuki Smart Lock Pro (4th Generation) review
Households who want to keep their existing BS3621-rated cylinder in place while adding WiFi-connected smart access with Matter support.
By Tom Calder
The manufacturer has replaced this model with a newer version, so we no longer recommend buying it new — remaining listings are old stock or secondhand. The newer model, Nuki Smart Lock Pro (5th Gen), has taken its place in our Smart locks guide.
The more insurance-friendly of the two Nuki locks on test: it clamps onto the existing thumbturn rather than replacing the cylinder, so a BS3621-rated lock underneath stays exactly as it was. Built-in WiFi and Matter support mean no separate bridge is needed, and it costs meaningfully less than the Ultra.
ⓘ As an Amazon Associate, PreparedBritain earns from qualifying purchases. We may earn a commission when you buy, or a fee when you request a quote, through our links — it never affects what we recommend. Amazon prices come from Amazon's own product data and show the date and time they were retrieved. Prices at other retailers are checked by us, less often. Prices and stock can change at any time, so always check the retailer's price before you buy.
- Clamps onto the existing thumbturn without replacing the cylinder, so any current BS3621-rated lock stays functional underneath
- Built-in WiFi and Matter (over Thread) support without a separate bridge
- Costs meaningfully less than the Ultra
- The previously sold '4th generation'-labelled listing is discontinued; current stock is the same physical design sold simply as 'Nuki Smart Lock Pro (Euro Profile)', so double-check you're buying the current listing
- Nuki itself makes no BS3621 or insurance-approval claim for the unit
- Full PIN/fingerprint entry needs the separately sold Keypad 2
Who shouldn't buy this
Skip this if your existing cylinder isn't a standard euro-profile thumbturn; check compatibility against Nuki's own documentation before buying.
Key specs
| Type | Clamp-on — existing euro-cylinder stays in place |
| Access methods | App, integrated WiFi, Matter, optional keypad |
| Battery life | Rechargeable Power Pack, ~6 months claimed |
| Insurance | Clamp-on — existing BS3621 lock underneath stays functional |
Our rating is a considered spec-and-evidence verdict: we verify every specification against at least two independent sources, re-check the UK price on a schedule where we can track it automatically, and say plainly who a product isn't for. Commissions never change a rating. Read the full methodology →
Alternatives to consider
as of 20 Sep 2026, 12:29 BST · Details
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.co.uk at the time of purchase will apply to the purchase of this product.Want this cheaper?
We don't yet re-check this product's price automatically. Leave your email and we'll tell you when it drops — nothing else.