This offer runs until 23:59 on Sunday, 27 September and can be redeemed by applying the code 'GOOGLEBDAY22' at checkout.
Here's everything Google is including in the offer:
Nest Mini (2nd gen)
Was £49, now £38.22
Google's second-gen Nest Mini smart speaker is the smallest and easiest way to bring the Google Assistant into your home. What's more, it boasts superior sound with improved bass when compared against the original Mini, making it a great way to kick off a multi-room speaker setup
Read our Google Nest Mini review for more
Was £79.99, now £62.39
Google's smart display for the home - the Nest Hub - supports the Google Assistant, serves as a Google Photos-compatible photo frame, lets you control your connected smart home devices and more.
Read our Google Nest Hub review for more
Nest Hub Max
Was £219, now £170.82
If you like the idea of the Nest Hub but want a larger 10in display, a built-in Nest security camera and video messaging capabilities, you'll like the Nest Hub Max. We consider it the best smart display you can get right now.
Read our Google Nest Hub Max review for more
Was £149, now £116.22
Google's Nest WiFi mesh routers are smart, secure and easy-to-use. As well as blanketing your home in a reliable WiFi connection they also double as smart speakers, serving as an easy way to spread the Google Assistant (and music playback) throughout your home.
They sit among our top five Best Mesh WiFi Kits 2020 and this discount makes them all the more appealing
Read our Google Nest WiFi review for more
The company's Nest Hello video doorbell notifies you when someone's at the door and captures a clip that you can refer back to as needed. What's more, it allows for 24-hour streaming, so you can check on it at any time.
Read our Google Nest Hello review for more
The Nest Protect smoke alarm and carbon monoxide sensor does more than just beep, with voice-based alerts telling you exactly what it detects, plus app integration, making it easy to control. It also comes in both mains and battery variants, although we'd recommend the latter, considering promised longevity is around ten years - up from seven on its predecessor.
Read our Nest Protect (2nd gen) review for more
Nest Cam IQ Indoor
Both the indoor and outdoor versions of Google's Nest Cam IQ security camera are up for offer as part of the deal. The Indoor model promises face recognition, to tell when someone's in-frame and what's more, it can zoom in and send an alert to your phone, should it detect an intruder.
Read our Nest Cam IQ review for more
Nest Cam IQ Outdoor
The outdoor model of Google's Nest Cam IQ boasts the same great feature set as the indoor model, along with new mounting options for outdoor use.
Nest Thermostat (3rd gen)
The latest generation of Google's Nest Learning Thermostat not only looks good, it can program itself to suit your usage habits. This latest generation also adds hot water control - a huge bonus and, of course, you can control it remotely using voice or your smartphone.
Read our Nest thermostat (3rd gen) review for more
Nest Thermostat E
One of the most stylish and easy-to-use smart thermostats on the market, the Nest Thermostat E is a great choice if you're looking to make the jump to an intelligently-controlled heating system. It's also the easiest to install yourself, making it more cost-effective than other solutions - and that's before we take into account Google's birthday offer.
Read our Nest Thermostat E review for more
Stadia Premiere Edition
Was £89.99, now £70.19
There's no denying that Google Stadia - the company's game-streaming service - had a pretty bumpy start when it launched at the end of 2019, but it's grown immeasurably since then. It now offers support for a myriad of devices: from Chromecast, to laptops, to smartphones, and the game library has grown significantly too.
The Stadia Premiere Edition includes a Google Chromecast Ultra, for streaming games to your TV in up to 4K resolution at 60fps, plus a Stadia Controller, making it easier to move between devices with ease.