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The Workshop Sheet 10 of 22

LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Treehouse

Checking

31010 Treehouse

352 pieces in 93 part and color combinations, plus 1 minifigure.

The official piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Bricks 70 pieces

  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×2
  • Brick 1 x 1 Reddish Brown Part 3005 Element 4211242 ×3
  • Brick 1 x 2 Reddish Brown Part 3004 Element 4613963 or 4211149 ×19
  • Brick 1 x 4 Reddish Brown Part 3010 Element 4211225 ×4
  • Brick 2 x 2 Reddish Brown Part 3003 Element 4211210 ×7
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×10
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×20
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×2
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×3

Plates 58 pieces

  • Plate 1 x 1 Blue Part 3024 Element 302423 1 spare in the box ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 6 x 16 Blue Part 3027 Element 4611373 or 4107589 ×1
  • Plate 16 x 16 Bright Green Part 91405 Element 4611777 ×1
  • Plate 2 x 6 Dark Brown Part 3795 Element 4518687 ×3
  • Plate 2 x 3 Dark Green Part 3021 Element 6013801 or 4650244 ×7
  • Plate 6 x 8 Dark Tan Part 3036 Element 4251796 ×2
  • Plate 1 x 1 Green Part 3024 Element 302428 1 spare in the box ×4
  • Plate 2 x 6 Green Part 3795 Element 379528 ×5
  • Plate 1 x 2 Reddish Brown Part 3023 Element 4211150 ×11
  • Plate 2 x 4 Reddish Brown Part 3020 Element 4211186 ×8
  • Plate 4 x 4 Reddish Brown Part 3031 Element 4243838 or 4225868 ×4
  • Plate 2 x 6 Tan Part 3795 Element 4113993 or 379505 ×1
  • Plate 4 x 4 Tan Part 3031 Element 4243824 or 4113919 ×2
  • Plate 6 x 6 Tan Part 3958 Element 4125217 ×1
  • Plate 1 x 1 White Part 3024 Element 6548262 or 302401 1 spare in the box ×1
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×1
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×3

Bricks Sloped 50 pieces

  • Brick Sloped Inverted 45° 2 x 1 Dark Brown Part 3665 Element 4654915 ×10
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Red Part 54200 Element 5074621 or 4504379 1 spare in the box ×2
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×8
  • Brick Sloped 45° 2 x 8 Red Part 4445 Element 4550322 or 4239184 ×3
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Reddish Brown Part 54200 Element 4504376 or 4260486 1 spare in the box ×14
  • Brick Sloped 33° 3 x 1 Reddish Brown Part 4286 Element 4211197 ×7
  • Brick Sloped 45° 2 x 2 Reddish Brown Part 3039 Element 4211202 ×4
  • Brick Sloped 75° 2 x 1 x 3 with Hollow Stud Reddish Brown Part 4460b Element 4270470 ×2

Plates Round Curved and Dishes 36 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Green Part 4032a Element 6035029 ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Green Part 4032a Element 403228 ×13
  • Plate Round 1 x 1 with Solid Stud Lime Part 6141 Element 4183133 1 spare in the box ×15
  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×2
  • Plate Round 1 x 1 with Solid Stud Yellow Part 6141 Element 614124 1 spare in the box ×3

Tiles 29 pieces

  • Tile 1 x 1 with Groove Dark Bluish Gray Part 3070b Element 4210848 1 spare in the box ×8
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×15
  • Tile 1 x 6 with Groove Light Bluish Gray Part 6636 Element 4211549 ×1
  • Tile 1 x 1 with Groove Reddish Brown Part 3070b Element 4211288 1 spare in the box ×4
  • Tile 2 x 2 with Map River, Dark Tan Mountains, Handwriting and Red X Print Tan Part 3068bpr0139 Element 4524449 ×1

Panels 13 pieces

  • Panel 1 x 1 x 1 Corner Red Part 6231 Element 4190219 or 623121 ×4
  • Panel 1 x 2 x 1 [Rounded Corners] Red Part 4865b Element 6146217 or 486521 ×2
  • Panel 1 x 1 x 1 Corner Yellow Part 6231 Element 4201587 or 4113238 ×4
  • Panel 1 x 2 x 1 [Rounded Corners] Yellow Part 4865b Element 6146219 ×3

Plates Special 13 pieces

  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
  • Plate Special 1 x 2 with Clip Horizontal on End Black Part 63868 Element 6336989 or 4535739 ×2
  • Plate Special 1 x 4 with 2 Studs, 3 Bottom Tubes Light Bluish Gray Part 92593 Element 4599498 ×6
  • Plate Special 2 x 2 with 2 Pin Holes Red Part 2817 Element 281721 ×3

Technic Pins 8 pieces

  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×5
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2

Tiles Round and Curved 8 pieces

  • Tile Round 1 x 1 Light Bluish Gray Part 98138 Element 6284071 or 4650260 1 spare in the box ×7
  • Tile Round 2 x 2 with Pizza Print Yellow Part 4150pr0015 Element 81867 ×1

Windows and Doors 8 pieces

  • Window 1 x 2 x 2 Flat Front Tan Part 60592 Element 6387150 or 6378142 ×3
  • Window 1 x 4 x 3 without Shutter Tabs Tan Part 60594 Element 4578109 ×1
  • Glass for Window 1 x 2 x 2 Flat Trans-Clear Part 60601 Element 6673770 or 6524697 ×3
  • Glass for Window 1 x 4 x 3 [Opening] Trans-Clear Part 60603 Element 6514142 or 6253734 ×1

Bars, Ladders and Fences 7 pieces

  • Bar 1 x 4 x 3 [End Tabs] Dark Bluish Gray Part 62113 Element 4521886 ×2
  • Bar 4L (Lightsaber Blade / Wand) Light Bluish Gray Part 30374 Element 6116608 or 4211628 ×2
  • Fence Spindled 1 x 4 x 2 [4 Top Studs] Reddish Brown Part 15332 Element 6066114 ×2
  • Antenna 1 x 4 with Flat Top White Part 3957b Element 6550147 or 395701 ×1

Bricks Curved 7 pieces

  • Brick Arch 1 x 5 x 4 [Irregular Bow, Raised Underside Cross Supports] Reddish Brown Part 76768 Element 6012805 ×6
  • Brick Arch 1 x 3 White Part 4490 Element 6619289 or 4520970 ×1

Bricks Special 6 pieces

  • Brick Special 1 x 2 with 2 Studs on 1 Side Red Part 11211 Element 6019155 ×6

Tiles Special 6 pieces

  • Tile Special 1 x 1 with Clip with Rounded Tips Black Part 12825 Element 6030718 ×4
  • Tile Special 2 x 2 Inverted Tan Part 11203 Element 6013081 ×2

Minifig Upper Body 5 pieces

  • Arm Mechanical with 2 Clips [Battle Droid] Dark Bluish Gray Part 30377 Element 6319332 or 4210900 1 spare in the box ×3
  • Arm Mechanical Straight (Droid) [2 Clips at 90°] Tan Part 59230 Element 4508093 1 spare in the box ×2

Plates Wedged 4 pieces

  • Wedge Plate 4 x 4 Cut Corner Tan Part 30503 Element 6034852 or 4569474 ×4

String, Bands and Reels 3 pieces

  • String Cord Thin (0.5mm) 50cm Black Part 56823c50 Element 6530026 or 6489925 ×1
  • String Reel 2 x 2 Winch Holder Black Part 2584 Element 6465125 or 6163507 ×1
  • String Reel 2 x 2 Winch Drum Light Bluish Gray Part 2585 Element 4211370 ×1

Technic Bricks 3 pieces

  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×1
  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×2

Bricks Round and Cones 2 pieces

  • Cone 1 x 1 [Top Groove] Red Part 59900 Element 4529234 ×2

Minifig Accessories 2 pieces

  • Equipment Radio [Extended Handle, Compact Speaker Grille] Black Part 3962b Element 396226 ×1
  • Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 Pearl Gold Part 64644 Element 4538126 ×1

Technic Axles 2 pieces

  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×2

Transportation - Land 2 pieces

  • Wheel Holder, Plate, Round 2 x 2 Thin with Clips Light Bluish Gray Part 2655 Element 6152344 or 4211373 ×2

Wheels and Tyres 2 pieces

  • Wheel Skateboard / Trolley Black Part 2496 Element 6223673 or 4569104 ×2

Animals / Creatures 1 piece

  • Animal, Frog Green Part 33320 Element 6171101 or 4157270 ×1

Containers 1 piece

  • Trash Can with 4 Cover Holders Light Bluish Gray Part 92926 Element 6194308 or 4626648 ×1

Flags, Banners and Signs 1 piece

  • Flag 2 x 2 Square, Flat Clip Edge [Thick Clips] Blue Part 11055 Element 6011816 ×1

Hinges, Arms and Turntables 1 piece

  • Hinge Plate 1 x 2 Locking with 1 Finger On Top Black Part 30383 Element 6338799 or 4144575 ×1

Supports, Girders and Cranes 1 piece

  • Hook with Towball Dark Bluish Gray Part 30395 Element 30395199 or 6347464 ×1

Technic Bushes 1 piece

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×1

Technic Connectors 1 piece

  • Technic Axle Connector Smooth [with x Hole + Orientation] Reddish Brown Part 59443 Element 4531751 ×1

Technic Gears 1 piece

  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×1

Minifigures 1 figure

  • Kid - Blue Torso, Light Bluish Grey Legs, Red Cap Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

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