Cat Birthday Party & Tree House (42666)
Prices last checked: 1 May 2026 at 02:01
Available From
Price Analysis
Lowest Price Ever
£16.00
at Amazon UK · Mar 2026
Average Price (12mo)
£20.04
Current vs Average
-12.9%
Below average
Price Trend
Stable
Last 30 days
Best Month to Buy
April
Value Score
10.0/10
Price-per-piece vs theme avg
The lowest price we've recorded for Cat Birthday Party & Tree House is £16.00 at Amazon UK in March 2026. The current price is 12.9% below the 12-month average of £20.04. Historically, April tends to offer the best prices for this set.
Price History & Buying Verdict
- •It's currently 12.9% below the 12-month average price of £20.04 — a notably good window.
- •On price-per-piece, this is one of the better-value sets in the Friends range (value score 10.0/10 vs theme average).
- •A recent price drop of about £4.54 was recorded in the last 30 days.
We've been tracking the price of LEGO Friends Cat Birthday Party & Tree House (321 pieces) for 105 days, recording 41 data points across LEGO.com and major UK retailers. Over that period the price has dropped 8 times below previous levels, with the lowest price ever recorded being £16.00 at Amazon UK in March 2026.
The 12-month average sale price for set 42666 works out to £20.04 — that's 19.8% below the LEGO RRP of £24.99. The highest price we recorded across our tracked retailers was £25.00, giving a range of about £9.00 between the cheapest and most expensive observation.
Amazon UK has run the most price drops on this set in the period we've tracked, making it the retailer most worth watching for short-term deals. Historically, April has produced the lowest average prices for Cat Birthday Party & Tree House, so if you're not in a hurry it's worth bookmarking the page closer to that window.
Want to see how LEGO Cat Birthday Party & Tree House (set 42666) compares against other sets? Browse the best-value LEGO sets or check the full price-history tracker.
Description
Cat Birthday Party & Tree House (42666) is a LEGO Friends set with 321 pieces, with an RRP of £24.99. It's currently available from £17.46 at Amazon DE — 12% below the RRP, saving you £3.00. Prices have been stable over the last 30 days. With a value score of 10.0/10, this set offers excellent value compared to other Friends sets.
Discover a paw-some building kit for girls, boys and cat-lovers aged 6 and up. The LEGO® Friends Cat Birthday Party & Tree House (42666) toy comes with 2 minidolls, 5 cat figures and lots of accessories for imaginative play packed with sweet kitty moments.
This fun toy sets the scene for Churro’s birthday party. 4 of Churro’s feline friends are here too, plus LEGO Friends characters Leo and Paisley. Explore the fun details, including birthday presents, banners and cat-shaped balloons. Kids will love guiding the pets around the cat tree house, where there’s a fish-shaped piñata, a cat toy, cat grass, a water fountain and litter box. Then it’s time for the cats to sit at the rotating table to enjoy Churro’s birthday cake. With so many ways to play with this animal playset, kids can tell a different friendship story every time.
Discover more exciting creative toys (sold separately) in the LEGO Friends universe. This LEGO set comes with the LEGO Builder app for intuitive building.
Features
- A building kit for cat-loving kids – This LEGO® Friends Cat Birthday Party & Tree House toy for girls and boys aged 6 and up comes with 2 minidolls and 5 cat figures for imaginative play
- Cat tree-house toy – Kids can have lots of fun playing with the 5 cats on the cat tree house, which features a fish-shaped piñata with treats inside, a cat toy, cat grass and a water fountain
- Create stories with the LEGO® Friends characters – This pretend-play set comes with Leo and Paisley minidolls, 5 cat figures, a buildable cat tree house and a buildable birthday cake scene
- Cat-themed accessories – Kids can create endless fun stories using the accessories, which include a birthday cake with candle, gifts, banners, cat-shaped balloons, a birthdayhat and cat treats
- A gift for kids who love cats – This animal toy set makes a great creative gift for girls, boys and cat-lovers aged 6 and up or for anyone who would love to build a cat-themed birthday scene
- Online show – Inspire more creative-play ideas with other sets (sold separately) and the LEGO® Friends: The Next Chapter online show, where kids can get to know the characters of Heartlake City
- Let’s tell a friendship story – The LEGO® Friends range of building sets lets kids explore different friendship moments, with lots of opportunities to create their own imaginative stories
- Measurements – 321-piece set with a main model measuring over 7 in. (18 cm) high, 6 in. (16 cm) wide and 4 in. (10 cm) deep
Frequently Asked Questions about Cat Birthday Party & Tree House
What is the best price for LEGO Cat Birthday Party & Tree House (Set 42666)?
The best current price for LEGO Cat Birthday Party & Tree House (Set #42666) is £20.78 at Amazon DE. This is £3.00 cheaper than the official LEGO RRP of £24.99. Price last verified on 1 May 2026.
How much can I save on LEGO Cat Birthday Party & Tree House?
You can save £3.00 (12% off) on LEGO Cat Birthday Party & Tree House by buying from Amazon DE instead of LEGO.com. The official RRP is £24.99, but you can get it for just £20.78. Browse more top discounts.
How many pieces are in LEGO set 42666?
LEGO Cat Birthday Party & Tree House (Set #42666) contains 321 pieces. At the best available price of £20.78, that works out to approximately 6.5p per piece.
What age is LEGO Cat Birthday Party & Tree House suitable for?
LEGO Cat Birthday Party & Tree House (Set #42666) is recommended for ages 6+. This set is part of the LEGO Friends theme. View all Friends sets and deals.
Where can I find the building instructions for LEGO Cat Birthday Party & Tree House?
You can download the official building instructions for LEGO Cat Birthday Party & Tree House (Set #42666) for free from LEGO.com. Download the building instructions here. The instructions are available as a PDF and can be viewed on any device.
Where can I buy LEGO Cat Birthday Party & Tree House in the UK?
Is LEGO Cat Birthday Party & Tree House on sale right now?
Yes! While not on sale at LEGO.com, you can get LEGO Cat Birthday Party & Tree House for £20.78 at Amazon DE - that's 12% below the official RRP of £24.99. Browse more best offers.
What is the lowest price ever recorded for LEGO Cat Birthday Party & Tree House?
The lowest price we've recorded for LEGO Cat Birthday Party & Tree House (Set #42666) is £16.00 at Amazon UK in March 2026. That's 36% off the LEGO RRP of £24.99. Track the latest movements on our LEGO price history page.
Is LEGO Cat Birthday Party & Tree House good value for money?
Comparing piece-count to price across the LEGO Friends theme, this set scores 10.0 / 10 for value. That works out to about 6.5p per piece. That puts Cat Birthday Party & Tree House in the top tier of Friends sets for raw build value — you're paying noticeably less per brick than the theme average. Compare against other contenders on our best-value LEGO sets page.
More Friends Sets
View all Friends →
Friends
Pony Ranch & Stable (42654)
€47.90(~£40.24)
£59.99
33% off
at Amazon DE
Friends
Animal Vet Clinic (42696)
€18.89(~£15.87)
£24.99
36% off
at Amazon DE
Friends
Family Vacation Beach Resort (42673)
£74.99
£119.99
38% off
at Amazon UK
Friends
Fun Indoor Playground (42686)
€42.60(~£35.78)
£54.99
35% off
at Amazon DE
Friends
Heartlake City Ice Cream Truck (42644)
£12.95
£17.99
28% off
at Amazon UK
Friends
Heartlake City Friends Club House (42689)
€63.99(~£53.75)
£79.99
33% off
at Amazon DE
Similar Price Range
Speed Champions
Oracle Red Bull Racing RB20 F1® Race Car (77243)
£16.54
£22.99
28% off
at Amazon UK
LEGO® Super Mario™
Party at Toad's House (72041)
€17.85(~£14.99)
£24.99
40% off
at Amazon DE
Disney™
Mickey & Minnie Birthday Train (10941)
£24.00
£29.99
20% off
at Amazon UK
Marvel
Captain America vs. Thanos (76319)
£19.99
£29.99
33% off
at Amazon UK
Explore More LEGO Deals & Guides
If you're hunting for the cheapest LEGO sets in the UK, browse our curated guides and price-tracking pages.
Sets Under £25
View all under £25 →Speed Champions
Oracle Red Bull Racing RB20 F1® Race Car (77243)
£16.54
£22.99
28% off
at Amazon UK
LEGO® Super Mario™
Party at Toad's House (72041)
€17.85(~£14.99)
£24.99
40% off
at Amazon DE
Speed Champions
McLaren F1® Team MCL38 Race Car (77251)
£15.99
£22.99
30% off
at Amazon UK
Friends
Animal Vet Clinic (42696)
€18.89(~£15.87)
£24.99
36% off
at Amazon DE