How many pieces does the LEGO Cat Birthday Party & Tree House (42666-1) have?

The LEGO Cat Birthday Party & Tree House set (42666-1) contains 321 pieces. It was released in 2025 as part of the LEGO Friends theme.

How can I find missing parts for LEGO set 42666-1?

On BrickMissing you can check which parts from the LEGO Cat Birthday Party & Tree House (42666-1) you already own. Add your LEGO collection and we'll show exactly which of the 321 pieces you're missing and which you already have.

Can I build the LEGO Cat Birthday Party & Tree House with parts I already have?

Use BrickMissing's free parts checker to find out. Add LEGO sets you own to your collection and we'll cross-reference all 321 parts to show your buildability percentage and which specific pieces you still need.

What theme is the LEGO Cat Birthday Party & Tree House from?

The LEGO Cat Birthday Party & Tree House (42666-1) belongs to the LEGO Friends theme. You can browse all Friends sets on BrickMissing to find more sets from this theme.

Cat Birthday Party & Tree House - View 9

Cat Birthday Party & Tree House

42666-1 Friends 2025 321 parts 6.2% catalog rarity Intermediate

The LEGO Friends 42666 Cat Birthday Party & Tree House invites you to a festive celebration in Heartlake City. This 321-piece set brings LEGO Friends characters Leo and Paisley together with Churro, the birthday cat, and four additional feline friends for a grand event. Explore the multi-level cat tree house, complete with a fish-shaped piñata, a refreshing water fountain, cat grass, and a hidden litter box. Adorned with colorful birthday banners, presents, and cheerful cat-shaped balloons, the scene culminates around a rotating table where Churro’s special birthday cake awaits. This vibrant model offers many detailed components, from the intricate piñata design to the functional rotating dining area, ensuring a lively display.

42666-1

3D build progress

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Parts Inventory

🧱 321 parts

Showing the first 12 rows of the parts list (321 pieces in total). The full list loads automatically.

Color	Qty	LEGO price each
Unknown	1×	Check price → View
White	2×	€0,12 View at LEGO → View
White	1×	€0,15 View at LEGO → View
Bright Green	2×	€0,06 View at LEGO → View
Medium Brown	1×	€2,17 View at LEGO → View
Lavender	1×	€0,08 View at LEGO → View
Black	1×	€1,96 View at LEGO → View
Tan	2×	€0,28 View at LEGO → View
Medium Azure	1×	€0,27 View at LEGO → View
Bright Pink	2×	€0,17 View at LEGO → View
Blue	1×	€0,15 View at LEGO → View
Medium Azure	2×	€0,13 View at LEGO → View

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Catalog rarity

How common are the parts in Cat Birthday Party & Tree House?

6.2%Moderate rarity

more commonless common

9 of 146 recorded part+color combinations appear in 3 or fewer sets in our catalog. This does not measure replacement availability or price.

Theme average

6.1%

All sets

6.7%

Least common in our catalog

Sticker Sheet for Set 42666-1 · Unknown · only this set in our catalogBrick Curved 2 x 1 · Coral · only this set in our catalogBuy at LEGO ↗ Minidoll Torso Boy · Medium Nougat · 2 sets in our catalog

How we calculate this →