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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.

Hogwarts Classroom

Checking

4721 Hogwarts Classroom

71 pieces in 48 part and color combinations, plus 1 minifigure.

LEGO counts 73 pieces. This inventory comes from a separate parts catalog and lists 76, including the 5 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.

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Piece checklist

White 13 pieces

  • Animal, Bird, Owl Large, Rounded Features White Part 40232 Element 4508643 or 4153277 ×1
  • Brick Special 1 x 2 Palisade [aka Log] White Part 30136 Element 6552148 or 6059185 ×2
  • Cupboard 2 x 3 x 2 Door White Part 4533 Element 4261470 or 4248214 ×1
  • Hinge Brick 1 x 2 Base White Part 3937 Element 6619287 or 393701 ×1
  • Hinge Brick 1 x 2 Top Plate Thin White Part 3938 Element 393801 ×1
  • Panel 1 x 2 x 2 [Hollow Studs] White Part 4864b ×6
  • Tile 1 x 2 with Spider and Bag Print White Part 3069bpr0120 Element 4119411 ×1

Orange 12 pieces

  • Belville / Scala, Brick Round 1 x 1 x 2/3 Round Orange Part 33286 Element 4141048 ×2
  • Panel 1 x 2 x 1 [Square Corners] Orange Part 4865a Element 4624801 or 4116800 ×3
  • Plate 1 x 4 Orange Part 3710 Element 4118782 ×1
  • Plate 1 x 8 Orange Part 3460 Element 6210229 or 4497175 ×1
  • Plate 2 x 2 Orange Part 3022 Element 4613982 or 4159007 ×3
  • Plate 2 x 3 Orange Part 3021 Element 4125278 ×1
  • Plate 2 x 8 Orange Part 3034 Element 6586073 or 6442682 ×1

Trans-Neon Orange 7 pieces

  • Cone 1 x 1 [No Top Groove] Trans-Neon Orange Part 4589 Element 4529918 or 618847 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Orange Part 6141 Element 6240218 or 3005747 1 spare in the box ×4
  • Wave / Flame Rounded with Base Pegs Trans-Neon Orange Part 6126a ×2

Medium Dark Pink 6 pieces

  • Plant, Flower, Plate Round 1 x 1 with 4 Petals Medium Dark Pink Part 33291 Element 4141174 1 spare in the box ×3
  • Seat / Chair 2 x 2 Medium Dark Pink Part 4079 Element 4159773 or 407922 ×3

Trans-Dark Pink 5 pieces

  • Bar 4L (Lightsaber Blade / Wand) Trans-Dark Pink Part 30374 Element 6507885 or 6291400 ×1
  • Brick 2 x 2 without Inside Ridges Trans-Dark Pink Part 6223 Element 6490767 or 4143571 ×3
  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Dark Pink Part 30153 Element 6513975 or 6247796 ×1

Black 3 pieces

  • Equipment Pot / Cauldron 3 x 3 x 1 & 3/4 with Handles Black Part 4341 Element 4525078 or 434126 ×1
  • Glass for Window 1 x 4 x 5 with Classroom Blackboard Print Black Part 2494pr0004 Element 4233528 or 4168627 ×1
  • Window 1 x 2 x 2 2/3 Pane Lattice Diamond with Rounded Top Black Part 30046 Element 6173105 or 3004626 ×1

Light Violet 3 pieces

  • Brick 2 x 2 Light Violet Part 3003 Element 4159006 ×1
  • Plate 8 x 8 Light Violet Part 41539 Element 4158300 ×1
  • Window 1 x 4 x 5 with Hollow Studs Light Violet Part 2493b Element 4158325 ×1

Medium Orange 3 pieces

  • Cupboard 2 x 3 x 2 with Solid Studs Medium Orange Part 4532 Element 4158327 ×1
  • Door Frame 1 x 8 x 6 with Moulded Stone Print and Clips Medium Orange Part 40242 Element 4158321 ×1
  • Window 1 x 4 x 5 with Hollow Studs Medium Orange Part 2493b Element 4158320 ×1

Chrome Antique Brass 2 pieces

  • Equipment Key Chrome Antique Brass Part 62808 ×2

Green 2 pieces

  • Animal, Frog Green Part 33320 Element 6171101 or 4157270 ×1
  • Book 2 x 3 with Red Bottles Print Green Part 33009pr0006 Element 4157051 ×1

Trans-Dark Blue 2 pieces

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Dark Blue Part 30153 Element 6513973 or 6247793 ×1
  • Tile 1 x 2 with Gold Stars Print Trans-Dark Blue Part 3069bpr0118 Element 4129911 ×1

Trans-Neon Green 2 pieces

  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×1
  • Insect, Spider Trans-Neon Green Part 30238 Element 6109894 or 4120133 ×1

Trans-Purple 2 pieces

  • Brick 1 x 1 Trans-Purple Part 3005 Element 6240552 or 6066120 ×2

Violet 2 pieces

  • Door 1 x 4 x 6 Round Top with Window and Keyhole, Non Reinforced Edge Violet Part 40241 Element 4158317 ×1
  • Plate 8 x 8 Violet Part 41539 Element 4158299 ×1

[No Color/Any Color] 2 pieces

  • Backdrop for Set 4721-1 [No Color/Any Color] Part 4163003 Element 4163003 ×1
  • Sticker Sheet for Set 4721-1 [No Color/Any Color] Part 41606 Element 4158383 ×1

Brown 1 piece

  • Bar 4L (Lightsaber Blade / Wand) Brown Part 30374 Element 4157700 ×1

Chrome Gold 1 piece

  • Tile 1 x 2 with Ball Chrome Gold Part 70942 Element 4129912 ×1

Dark Gray 1 piece

  • Book 2 x 3 with Dragon and Spider Print Dark Gray Part 33009pr0009 Element 4157049 ×1

Trans-Clear 1 piece

  • Glass for Window 1 x 4 x 5 Trans-Clear Part 2494 Element 4114269 or 249440 ×1

Yellow 1 piece

  • Tile 1 x 1 with Groove Yellow Part 3070b Element 307024 1 spare in the box ×1

Minifigures 1 figure

  • Harry Potter, Yellow Skin, Gryffindor Sweater with Crest, Violet Cape 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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