Name: LEGO Cat Birthday Party & Tree House (42666-1)
Brand: LEGO
SKU: 42666-1
Availability: InStock

Cat Birthday Party & Tree House (42666-1)

LEGO set 42666-1 Cat Birthday Party & Tree House - Image 1

Set details

Name: Cat Birthday Party & Tree House
Set number: 42666-1
Year: 2025
Theme: Friends
Number of parts: 321
Number of part types: 146
Age rating: 6+
Retail price:
Retirement date: 31-12-2026

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.

Price History

Track how the lowest available price for set 42666-1 has changed over time.

Browse all 321 parts in set 42666-1 with individual pricing from BrickLink or Brick Owl.

Price source:

Value of parts:
Pricing information known of 143/146 parts.

Part

Color

Quantity

Average price

Total

Value

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end

Tan

6 x

Minidoll Torso Girl with Bright Light Yellow Top, Coral/Dark Blue Shapes, Writing, Lavender Shirt print, Light Nougat Arms and Hands

Light Nougat

1 x

Plant, Plate 1 x 1 Round with 3 Leaves

Yellowish Green

25 x

String with End Studs 11L Overall

Black

2 x

Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small

Bright Green

5 x

Animal, Cat, Chubby with orange Face, Toes, Medium Blue/Lime Eyes print

White

1 x

Animal, Cat, Sitting with Dark Brown Stripes, White Chest, Ears print

Medium Brown

1 x

Plate Round Corner 6 x 6

Blue

2 x

Plant, Flower with 5 Pointed Petals and Pin

Light Aqua

3 x

Animal, Cat, Chubby with Bright Green Eyes, Light Bluish Grey Fur print

Dark Bluish Gray

1 x

Animal, Cat, Kitten Sitting with Open Eyes, White Mouth, Nougat Paws print

Nougat

1 x

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Bright Pink

3 x

Plate Special 1 x 2 Rounded with 2 Open Studs

Bright Green

2 x

Wool / Yarn

Bright Light Yellow

1 x

Animal, Cat, Kitten Sitting with Yellow Eyes, Dark Pink Tongue print

Black

1 x

Plate 1 x 10

Medium Azure

3 x

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Pink

3 x

Brick 2 x 3

Dark Orange

1 x

Hair, Long Wavy Across Face

Dark Red

1 x

Headwear Accessory Hat with Small Pin, Cap

Lime

2 x

Plant, Leaves Stacked 4 x 5 x 1 2/3

Lime

3 x

Technic Axle Connector Smooth [with x Hole + Orientation]

Tan

6 x

Plant, Stem with 3 Leaves and Bottom Pin

Bright Green

7 x

Slope Curved 2 x 1 No Studs [1/2 Bow]

Bright Green

2 x

Brick Special 1 x 1 with Studs on 2 Sides

Blue

1 x

Plate 6 x 10

Lime

2 x

Tile 1 x 2 with Cat Food Box, Cat, White 'MEOW BITS' print

Light Aqua

2 x

Equipment Candlestick

Reddish Brown

6 x

Plant, Leaves 4 x 3

Lime

8 x

Tile Round 1 x 2 Half Circle

Medium Azure

3 x

Plate Round 1 x 2 Half Circle with Stud (Jumper)

Blue

1 x

Brick Round 2 x 2 Dome Bottom [Open Stud]

Bright Pink

2 x

Brick Round 2 x 2 Dome Top with 2 Ears

Bright Pink

2 x

Flag 2 x 2 Square, Flared Clip Edge [Thick Clips]

White

3 x

Technic Axle Connector Hub with 3 Axles at 120°

Light Bluish Gray

3 x

Plant, Leaves Stacked 4 x 5 x 1 2/3

Bright Green

2 x

Cylinder Half 2 x 4 x 4

Tan

3 x

Wool / Yarn

Dark Pink

1 x

Brick Round 4 x 4 Centre Hole

Yellow

1 x

Bar 2L with Stop in Center

Tan

5 x

Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders

Reddish Brown

2 x

Bar 2L with Stop in Center

Reddish Brown

3 x

Plant, Flower, Peony Rose with 2 Layers

Medium Lavender

2 x

Hair Scruffy and Swept Right

Reddish Brown

1 x

Hose Rigid 3mm D. 9L / 7.2cm

Black

1 x

Minidoll Hips and Shorts with Warm Tan Legs, Dark Tan Shoes, White Laces, Socks, Laces

Medium Lavender

1 x

Tile 2 x 3

Blue

2 x

Plate 1 x 4

Bright Green

2 x

Slope Curved 2 x 2 x 2/3 Inverted

Bright Light Blue

2 x

Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder

Bright Light Blue

1 x

Minidoll Head Dark Red Eyebrows, Medium Azure Eyes, Nougat Lips print

Light Nougat

1 x

Minidoll Hips and Cargo Pants with Nougat Legs, Medium Azure/White Shoes print [Thin Hinge]

Yellow

1 x

Brick Curved 2 x 1 with Inverted Cutout

Bright Light Orange

2 x

Plate 1 x 2

Dark Orange

5 x

Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports]

Tan

2 x

Brick 1 x 2

Dark Orange

3 x

Minidoll Head Thick Black Eyebrows, Reddish Brown Eyes, Smile print

Medium Nougat

1 x

Brick Special 1 x 1 with Headlight

Bright Light Blue

2 x

Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side

Dark Turquoise

1 x

Plate Special 1 x 2 with Door Rail

Tan

3 x

Slope 30° 1 x 1 x 2/3 (Cheese Slope)

Bright Light Blue

3 x

Brick Special 1 x 2 with Grille

Tan

3 x

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Bright Green

3 x

Tile Round 1 x 1 with Animal Track Print

Medium Nougat

7 x

Brick Curved 1 x 2 x 1 No Studs

Tan

2 x

Brick Curved 2 x 1 with Inverted Cutout

Coral

2 x

Panel 1 x 2 x 3 [Side Supports / Hollow Studs]

White

2 x

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Blue

2 x

Cone 1 x 1 [Top Groove]

Tan

6 x

Animal, Fish [Hollow Stud Mouth]

Bright Light Blue

1 x

Image of part Minidoll Torso Boy with Medium Nougat Arms and Hands with Magenta/Coral Jacket, Medium Blue Trim, White Shirt, Orange/Azure Shapes print

Minidoll Torso Boy with Medium Nougat Arms and Hands with Magenta/Coral Jacket, Medium Blue Trim, White Shirt, Orange/Azure Shapes print

Medium Nougat

1 x

Bar 2L with Stop in Center

White

2 x

Plate Special 2 x 4 with Groove and Two Center Studs (Jumper)

Bright Green

4 x

Antenna 1 x 4 with Flat Top

Dark Orange

2 x

Plate Special 1 x 2 with Clip Vertical on End

Reddish Brown

1 x

Tile 1 x 4 with Groove

Bright Green

2 x

Tile 1 x 2 with Groove

Medium Azure

4 x

Brick 1 x 1

Coral

3 x

Brick 1 x 1

Bright Light Orange

3 x

Brick 1 x 1

Medium Azure

5 x

Window 1 x 4 x 3 without Shutter Tabs

White

1 x

Bar Holder with Clip

White

2 x

Brick Arch 1 x 3 x 2 Inverted [Inside Bow]

Medium Azure

2 x

Bar 1L with Clip [Cut Edges and One Side Hole] [Full Clip]

Reddish Brown

2 x

Brick 1 x 3

White

2 x

Tile 2 x 2 with Groove

Bright Pink

2 x

Headwear Accessory Crown / Tiara

Pearl Gold

2 x

Bar 4L (Lightsaber Blade / Wand)

White

2 x

Brick Arch 1 x 4 x 2

Coral

1 x

Brick 1 x 2

Coral

3 x

Technic Axle 2 Notched

Red

6 x

Plant, Plate 1 x 1 Round with 3 Leaves

Bright Green

4 x

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Dark Pink

4 x

Slope 33° 3 x 2

Reddish Brown

1 x

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Green

5 x

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Medium Azure

5 x

Cupboard 2 x 3 x 2 with Hollow Studs

Blue

1 x

Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)

Tan

1 x

Container Box 2 x 2 x 1 Reinforced Bottom

Bright Light Orange

1 x

Plate Round 1 x 1 with Solid Stud

Bright Pink

5 x

Tile 1 x 2 with Groove

Dark Turquoise

2 x

Brick 1 x 4

Medium Azure

2 x

Dish 2 x 2 Inverted [Radar]

Blue

2 x

Equipment Candlestick

Black

1 x

Plate 8 x 8 with Rounded End

Magenta

1 x

Plate 2 x 3

Light Aqua

1 x

Bar Holder with Hole and Bar Handle

Reddish Brown

1 x

Brick 1 x 2

Bright Light Orange

3 x

Plate 2 x 4

Orange

2 x

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Tan

4 x

Plate 1 x 1 x 2/3 with Open Stud

Dark Orange

1 x

Bar 5L with Handle (Friction Ram)

Black

1 x

Tile 2 x 2 Curved, Macaroni

Coral

2 x

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Green

2 x

Plate Round 1 x 1 with Hollow Stud and Horizontal Bar 1L

Black

2 x

Brick Arch 1 x 4

Bright Light Orange

1 x

Plate Special 1 x 2 Rounded with 2 Open Studs

Tan

1 x

Plate Round 1 x 1 Swirled Top / Poo

Reddish Brown

2 x

Tile 2 x 2 with Groove

Bright Light Orange

1 x

Equipment Shovel [Rounded Handle End]

Flat Silver

1 x

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Lavender

3 x

Tile Round 1 x 1 with Offset Black Eye Print

White

3 x

Wedge Plate 2 x 4

Blue

1 x

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Light Yellow

3 x

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Bright Pink

1 x

Technic Pin 1/2

Light Bluish Gray

2 x

Plate Round 1 x 1 with Solid Stud

Trans-Light Blue

2 x

Wave / Flame Small with Pin

Trans-Orange

2 x

Turntable 2 x 2 Female

White

1 x

Headwear Accessory Hat with Small Pin, Clown / Party with Pin

Pearl Gold

1 x

Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout

Yellow

1 x

Headwear Accessory Bow with Heart, Long Ribbon and Pin

Lavender

2 x

Plate 2 x 2

Light Bluish Gray

1 x

Plate 2 x 4

Medium Lavender

1 x

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Azure

2 x

Cone 1 x 1 [Top Groove]

Trans-Light Blue

1 x

Dish 2 x 2 Inverted [Radar]

Trans-Light Blue

1 x

Plate Special 1 x 2 with Clip Horizontal on Side

White

1 x

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Yellow

1 x

Tile Round 1 x 1

Trans-Yellow

2 x

Technic Brick 1 x 2 [1 Pin Hole]

Reddish Brown

1 x

Plate Round Corner 6 x 6

Lime

1 x

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Nougat

1 x

Missing pricing information on the following items.

	Color	Quantity
Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version]	Medium Azure	1
Sticker Sheet for Set 42666-1	[No Color/Any Color]	1
Plate Special 4 x 4 with 3 x 3 Quarter Round Cutout	Bright Pink	1

Compare the value of buying Cat Birthday Party & Tree House as a complete set versus the total value of all parts individually.

BrickLink
Condition	Timespan	Avg price	Items sold	Inventory value	Ratio
New	6 months	?	?		?
Used	6 months	?	?		?

Brick Owl
Condition	Timespan	Avg price	Inventory value	Ratio
New	Current			2.62
	6 months	?		?
	1 year	?		?
Used	Current	?		?

Find the cheapest offers for set 42666-1 from sellers on secondary marketplaces like Brick Owl and eBay.

Item		Price