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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.

Basic Building Set

Checking

525 Basic Building Set

181 pieces in 56 part and color combinations, plus 1 minifigure.

LEGO counts 175 pieces. This inventory comes from a separate parts catalog and lists 185, including the 4 parts inside the minifigures; 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

Red 68 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×10
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×10
  • Brick 1 x 3 Red Part 3622 Element 362221 ×4
  • Brick 1 x 4 Red Part 3010 Element 301021 ×6
  • Brick 1 x 6 Red Part 3009 Element 300921 ×3
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×2
  • Brick 2 x 2 Corner Red Part 2357 Element 235771 or 235721 ×2
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×2
  • Brick Sloped 33° 2 x 2 Double Red Part 3300 Element 330021 ×2
  • Brick Sloped 33° 2 x 4 Double Red Part 3299 Element 329921 ×1
  • Brick Sloped 33° 3 x 2 Red Part 3298 Element 329821 ×4
  • Brick Sloped 33° 3 x 4 Red Part 3297 Element 329721 ×2
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×2
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×2
  • Plate 2 x 3 Red Part 3021 Element 302121 ×2
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate 2 x 8 Red Part 3034 Element 303421 ×2
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×2

White 53 pieces

  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 Also in Trans-Clear ×12
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 Also in Trans-Clear ×12
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×4
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×10
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×3
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×1
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×2
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×3

Yellow 33 pieces

  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×6
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×6
  • Brick 1 x 3 Yellow Part 3622 Element 362224 ×2
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×4
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×1
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×2
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Yellow Part 3861b Element 4111937 or 386124 ×1
  • Fence Lattice 1 x 4 x 1 Yellow Part 3633 Element 4190509 or 363324 ×2
  • Plant, Flower - Small Yellow Part 3742 1 spare in the box ×3
  • Window 1 x 2 x 3 Pane Yellow Part 3854 Element 385424 ×6

Blue 10 pieces

  • Antenna 1 x 4 with Rounded Top Blue Part 3957a Element 395723 ×1
  • Plant, Flower - Small Blue Part 3742 1 spare in the box ×3
  • Plate 4 x 6 Blue Part 3032 Element 303223 ×1
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Blue Part 3081c01 Element 73861 ×2
  • Window 1 x 4 x 3 Blue Part 3853 Element 385323 ×3

Trans-Clear 7 pieces

  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 Also in White ×2
  • Brick 1 x 2 Trans-Clear Part 3004 Element 4256587 or 300410 Also in White ×3
  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×1
  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×1

Black 6 pieces

  • Brick Special 2 x 2 [Red Wheels for Single Tyre] Black Part 3137c01 ×2
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×4

Green 3 pieces

  • Baseplate 8 x 16 Green Part 3865 Element 4219812 or 4179599 ×1
  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×2

Dark Gray 1 piece

  • Brick Separator v1.0 Dark Gray Part 6007 Element 600727 ×1

Minifigures 1 figure

  • Man - Black Torso, Blue Pants, Black hair 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.

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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