The Workshop Sheet 10 of 19

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.

Basic Building Set Trial Size

Checking

1701 Basic Building Set Trial Size

26 pieces in 17 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.

Show

Piece checklist

Red 11 pieces

  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×4
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×1
  • Brick 2 x 6 Red Part 2456 Element 4181138 or 245621 ×2
  • Door Frame 2 x 4 x 5 Red Part 4130 ×1
  • Window 2 x 4 x 3 Frame with Solid Studs Red Part 4132 Element 413221 ×1

White 5 pieces

  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×2
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×1

Yellow 5 pieces

  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×2
  • Door 1 x 4 x 5 Yellow Part 4131 Element 4521099 ×1
  • Plant, Flower 2 x 2 - Round [Open Stud] Yellow Part 4728 Element 472824 ×1
  • Window 2 x 4 x 3 Pane Yellow Part 4133 Element 4113170 or 4101806 ×1

Blue 3 pieces

  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×2
  • Brick Curved 2 x 4 x 2 Double with Necktie Red Print Blue Part 4744pr0025 ×1

Black 1 piece

  • Brick Curved 2 x 4 x 2 Double with Face/Moustache Print Black Part 4744pr0007 Element 81947 ×1

Green 1 piece

  • Plant, Flower 2 x 2 Leaves - Angular Green Part 4727 Element 472728 ×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.