BlockTalk Find Your Set

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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

517 Basic Building Set

123 pieces in 33 part and color combinations.

LEGO counts 115 pieces. This inventory comes from a separate parts catalog and lists 123; 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

Bricks 82 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×6
  • 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 ×11
  • Brick 1 x 6 Red Part 3009 Element 300921 ×4
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×2
  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 Also in White ×2
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 Also in Trans-Clear ×8
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×11
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×4
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×5
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×3
  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×4
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×6

Bricks Sloped 11 pieces

  • Brick Sloped 33° 2 x 2 Double Blue Part 3300 Element 330023 ×2
  • Brick Sloped 33° 2 x 4 Double Blue Part 3299 Element 329923 ×1
  • Brick Sloped 33° 3 x 2 Blue Part 3298 Element 6294307 or 6141996 ×4
  • Brick Sloped 33° 3 x 4 Blue Part 3297 Element 6088711 or 329723 ×2
  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×2

Windows and Doors 9 pieces

  • Window 1 x 2 x 3 Pane Red Part 3854 Element 4175391 or 385421 ×4
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Yellow Part 3861b Element 4111937 or 386124 ×1
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Yellow Part 3081c01 Element 7028 ×2
  • Window 1 x 4 x 3 Yellow Part 3853 Element 4189096 or 385324 ×2

Plants & Trees 8 pieces

  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×2
  • Plant, Flower - Small White Part 3742 1 spare in the box ×3
  • Plant, Flower - Small Yellow Part 3742 1 spare in the box ×3

Plates 6 pieces

  • Plate 2 x 3 Blue Part 3021 Element 302123 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×3
  • Plate 4 x 4 Blue Part 3031 Element 4243815 or 303123 ×1

Wheels and Tyres 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

Baseplates 1 piece

  • Baseplate 8 x 16 Green Part 3865 Element 4219812 or 4179599 ×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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