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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Architecture Studio

Checking

21050 Architecture Studio

1,211 pieces in 77 part and color combinations.

LEGO counts 1,210 pieces. This inventory comes from a separate parts catalog and lists 1,211; the two do not always count the same elements, so their totals differ. 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.

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.

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Piece checklist

Plates 326 pieces

  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 Also in White ×40
  • Plate 1 x 2 Trans-Clear Part 3023 Element 6514001 or 6240204 Also in White ×50
  • Plate 1 x 1 White Part 3024 Element 6548262 or 302401 Also in Trans-Clear ×20
  • Plate 1 x 10 White Part 4477 Element 6552113 or 6550148 ×8
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 Also in Trans-Clear ×20
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×18
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×16
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×12
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×16
  • Plate 2 x 2 Corner White Part 2420 Element 6548254 or 242051 ×18
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×20
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×16
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×12
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×12
  • Plate 4 x 4 White Part 3031 Element 6552127 or 4243812 ×10
  • Plate 4 x 6 White Part 3032 Element 303201 ×10
  • Plate 4 x 8 White Part 3035 Element 6609533 or 303501 ×8
  • Plate 6 x 10 White Part 3033 Element 4528341 or 303301 ×4
  • Plate 6 x 6 White Part 3958 Element 6552116 or 4144012 ×6
  • Plate 6 x 8 White Part 3036 Element 303651 or 303601 ×4
  • Plate 8 x 8 White Part 41539 Element 4624911 or 4529687 ×6

Bricks 322 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 ×40
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×40
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×40
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×36
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×36
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×18
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×8
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×36
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×12
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×16
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×24
  • Brick 2 x 6 White Part 2456 Element 6552122 or 4249698 ×16

Bricks Sloped 168 pieces

  • Brick Sloped 18° 4 x 2 White Part 30363 Element 4143000 ×8
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) White Part 54200 Element 6550179 or 4504369 ×18
  • Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×10
  • Brick Sloped 33° 3 x 2 White Part 3298 Element 329801 ×12
  • Brick Sloped 33° 3 x 4 White Part 3297 Element 329701 ×12
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×12
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×12
  • Brick Sloped 45° 2 x 2 Double Convex White Part 3045 Element 4233370 or 304501 ×8
  • Brick Sloped 45° 2 x 4 White Part 3037 Element 6552102 or 303701 ×12
  • Brick Sloped 65° 2 x 1 x 2 White Part 60481 Element 6552132 or 4515370 ×10
  • Brick Sloped 75° 2 x 1 x 3 with Hollow Stud White Part 4460b Element 6552112 or 446001 ×10
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin White Part 3747b Element 4500469 ×10
  • Brick Sloped Inverted 34° 3 x 1 with Internal Stopper White Part 4287b ×10
  • Brick Sloped Inverted 45° 2 x 1 White Part 3665 Element 6552106 or 366501 ×12
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×12

Tiles 106 pieces

  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 ×30
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×20
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×12
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×12
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×12
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×20

Bricks Special 64 pieces

  • Brick Special 1 x 1 Studs on 4 Sides White Part 4733 Element 4111971 or 473301 ×12
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×16
  • Brick Special 1 x 1 with Studs on 2 Sides White Part 47905 Element 6548273 or 4626882 ×12
  • Brick Special 1 x 2 with Grille White Part 2877 Element 6552093 or 287701 ×16
  • Brick Special 1 x 4 with 4 Studs on One Side White Part 30414 Element 6550167 or 4143254 ×8

Plates Round Curved and Dishes 62 pieces

  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×30
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×12
  • Plate Round 4 x 4 with Pin Hole White Part 60474 Element 6564904 or 4515347 ×8
  • Plate Round Corner 4 x 4 White Part 30565 Element 4178429 ×12

Bricks Round and Cones 40 pieces

  • Brick Round 1 x 1 Open Stud White Part 3062b Element 6619283 or 306201 ×16
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×12
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] White Part 85080 Element 6619303 or 6078115 ×12

Panels 36 pieces

  • Panel 1 x 2 x 2 [Side Supports / Hollow Studs] Trans-Clear Part 87552 Element 6514185 or 6253231 ×16
  • Panel 1 x 1 x 1 Corner White Part 6231 Element 6619293 or 623101 ×10
  • Panel 1 x 4 x 1 with Rounded Corners [Thin Wall] White Part 15207 Element 6552215 or 6514504 ×10

Bricks Curved 30 pieces

  • Brick Arch 1 x 4 White Part 3659 Element 6550145 or 365901 ×6
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top White Part 6091 Element 6285777 or 609101 ×12
  • Brick Curved 3 x 1 No Studs White Part 50950 Element 6548268 or 4249112 ×12

Plates Special 20 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) White Part 3794b ×20

Tiles Special 20 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove White Part 2412b Element 6601902 or 241201 ×20

Bricks Wedged 16 pieces

  • Brick Wedged, Angled 4 x 2 Left White Part 41768 Element 4160343 ×8
  • Brick Wedged, Angled 4 x 2 Right White Part 41767 Element 4160325 ×8

Tools 1 piece

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×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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