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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.

Robie House

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21010 Robie House

2,276 pieces in 97 part and color combinations.

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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

  • Plate 1 x 2 White ×4 Trans-Clear ×5 Trans-Clear is see-through: hold the piece up to a light.
  • Plate 1 x 8 Black ×10 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
  • Plate 2 x 12 Black ×3 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
  • Plate 2 x 8 Black ×2 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.
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Piece checklist

Dark Red 1,294 pieces

  • Brick 1 x 1 Dark Red Part 3005 Element 4541376 or 4209383 ×10
  • Brick 1 x 2 Dark Red Part 3004 Element 4539102 or 4163454 ×11
  • Brick 1 x 6 Dark Red Part 3009 Element 4541528 or 4223789 ×4
  • Brick Sloped 33° 3 x 1 Dark Red Part 4286 Element 4650862 or 4168940 ×5
  • Brick Sloped 33° 3 x 2 Dark Red Part 3298 Element 6366021 or 4569379 ×33
  • Brick Sloped 33° 3 x 3 Double Concave Dark Red Part 99301 Element 4651936 ×2
  • Brick Sloped 33° 3 x 3 Double Convex Dark Red Part 3675 Element 4600461 ×12
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Red Part 3040b Element 4541526 or 4209500 ×4
  • Brick Sloped 45° 2 x 2 Dark Red Part 3039 Element 4609925 or 4162216 ×2
  • Brick Special 1 x 1 with Stud on 1 Side Dark Red Part 87087 Element 6212007 or 4651677 ×6
  • Plate 1 x 1 Dark Red Part 3024 Element 4539114 or 4183901 ×268
  • Plate 1 x 2 Dark Red Part 3023 Element 4539097 or 4162582 ×771
  • Plate 1 x 3 Dark Red Part 3623 Element 4539076 or 4164223 ×12
  • Plate 1 x 6 Dark Red Part 3666 Element 4539062 or 4164108 ×3
  • Plate 2 x 2 Corner Dark Red Part 2420 Element 4585751 or 4541513 ×60
  • Plate 2 x 3 Dark Red Part 3021 Element 6264030 or 4541510 ×6
  • Plate 2 x 4 Dark Red Part 3020 Element 4539071 or 4528320 ×7
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Dark Red Part 3794b Element 4539063 ×12
  • Tile 1 x 1 with Groove Dark Red Part 3070b Element 4550169 or 4187196 1 spare in the box ×2
  • Tile 1 x 2 with Groove Dark Red Part 3069b Element 4539090 or 4529548 ×13
  • Tile 1 x 3 Dark Red Part 63864 Element 4583299 ×3
  • Tile 1 x 4 with Groove Dark Red Part 2431 Element 4539060 or 4164220 ×5
  • Tile 1 x 6 with Groove Dark Red Part 6636 Element 4650865 or 4163776 ×9
  • Tile 1 x 8 with Groove Dark Red Part 4162 Element 4539083 or 4509951 ×2
  • Tile 2 x 2 with Groove Dark Red Part 3068b Element 4539105 or 4177046 ×32

Light Bluish Gray 505 pieces

  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×7
  • Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×2
  • Brick 1 x 6 Light Bluish Gray Part 3009 Element 4211393 ×4
  • Brick 2 x 3 Light Bluish Gray Part 3002 Element 4211386 ×1
  • Brick Special 1 x 1 with Headlight Light Bluish Gray Part 4070 Element 4211476 ×12
  • Panel 1 x 1 x 1 Corner Light Bluish Gray Part 6231 Element 4215513 ×2
  • Panel 1 x 4 x 1 with Rounded Corners [Thin Wall] Light Bluish Gray Part 15207 Element 6071299 ×3
  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 ×33
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×18
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×12
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×28
  • Plate 1 x 6 Light Bluish Gray Part 3666 Element 4211438 ×6
  • Plate 1 x 8 Light Bluish Gray Part 3460 Element 4211425 ×13
  • Plate 2 x 10 Light Bluish Gray Part 3832 Element 4211462 ×4
  • Plate 2 x 2 Light Bluish Gray Part 3022 Element 4211397 ×3
  • Plate 2 x 2 Corner Light Bluish Gray Part 2420 Element 4211353 ×6
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×5
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×20
  • Plate 4 x 10 Light Bluish Gray Part 3030 Element 4211402 ×5
  • Plate 4 x 4 Light Bluish Gray Part 3031 Element 4243797 or 4211403 ×2
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×2
  • Plate 6 x 6 Light Bluish Gray Part 3958 Element 4211474 ×1
  • Plate Round 1 x 1 with Solid Stud Light Bluish Gray Part 6141 Element 4211525 1 spare in the box ×3
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Bluish Gray Part 4032a Element 4211475 ×3
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Light Bluish Gray Part 3794b ×16
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Light Bluish Gray Part 87580 Element 6126082 or 4565393 ×2
  • Tile 1 x 1 with Groove Light Bluish Gray Part 3070b Element 4211415 5 spares in the box ×235
  • Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×6
  • Tile 1 x 3 Light Bluish Gray Part 63864 Element 4558169 ×16
  • Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×18
  • Tile 1 x 6 with Groove Light Bluish Gray Part 6636 Element 4211549 ×13
  • Tile 1 x 8 with 'Robie House' Print Light Bluish Gray Part 4162pr0011 Element 4653629 ×1
  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×3

Trans-Clear 256 pieces

  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×6
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 ×245
  • Plate 1 x 2 Trans-Clear Part 3023 Element 6514001 or 6240204 Also in White ×5

Black 167 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×4
  • Brick 1 x 3 Black Part 3622 Element 362226 ×3
  • Plate 1 x 1 Black Part 3024 Element 302426 ×11
  • Plate 1 x 12 Black Part 60479 Element 4514845 ×2
  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 1 x 8 Black Part 3460 Element 346026 Also in Dark Bluish Gray ×10
  • Plate 2 x 12 Black Part 2445 Element 244526 Also in Dark Bluish Gray ×3
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×17
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 2 x 6 Black Part 3795 Element 379526 ×3
  • Plate 2 x 8 Black Part 3034 Element 303426 Also in Dark Bluish Gray ×2
  • Plate 4 x 6 Black Part 3032 Element 303226 ×2
  • Plate 4 x 8 Black Part 3035 Element 303526 ×4
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Black Part 3794b Element 379426 ×9
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×4
  • Tile 1 x 3 Black Part 63864 Element 4558170 ×12
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×15
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×63

Dark Bluish Gray 19 pieces

  • Plate 1 x 8 Dark Bluish Gray Part 3460 Element 4210998 Also in Black ×1
  • Plate 2 x 12 Dark Bluish Gray Part 2445 Element 4211067 Also in Black ×2
  • Plate 2 x 8 Dark Bluish Gray Part 3034 Element 4210997 Also in Black ×6
  • Plate 6 x 10 Dark Bluish Gray Part 3033 Element 4211114 ×10

Tan 19 pieces

  • Plate 1 x 3 Tan Part 3623 Element 4121921 or 362305 ×3
  • Plate 1 x 6 Tan Part 3666 Element 4124067 or 366605 ×1
  • Plate 2 x 3 Tan Part 3021 Element 4118790 or 302105 ×1
  • Plate 2 x 6 Tan Part 3795 Element 4113993 or 379505 ×1
  • Plate 2 x 8 Tan Part 3034 Element 4113988 or 303405 ×2
  • Plate 4 x 6 Tan Part 3032 Element 4114001 ×2
  • Plate 6 x 6 Tan Part 3958 Element 4125217 ×7
  • Tile 1 x 6 with Groove Tan Part 6636 Element 4157277 or 4108151 ×2

Dark Green 8 pieces

  • Plate 4 x 8 Dark Green Part 3035 Element 4505051 ×1
  • Plate 6 x 10 Dark Green Part 3033 Element 4549214 ×7

White 8 pieces

  • Brick 1 x 12 White Part 6112 Element 6548281 or 611201 ×1
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 Also in Trans-Clear ×4
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×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.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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