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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

557 Basic Building Set

721 pieces in 131 part and color combinations, plus 2 minifigures.

LEGO counts 711 pieces. This inventory comes from a separate parts catalog and lists 729, including the 8 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

Bricks 483 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×18
  • Brick 1 x 2 Black Part 3004 Element 300426 ×26
  • Brick 1 x 3 Black Part 3622 Element 362226 ×4
  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 1 x 6 Black Part 3009 Element 300926 ×2
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×4
  • Brick 2 x 3 Black Part 3002 Element 300226 ×4
  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick 1 x 1 Blue Part 3005 Element 300523 ×22
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×30
  • Brick 1 x 3 Blue Part 3622 Element 362223 ×4
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×10
  • Brick 1 x 6 Blue Part 3009 Element 300923 ×6
  • Brick 1 x 8 Blue Part 3008 Element 300823 ×2
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×4
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×4
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×6
  • Brick 1 x 1 Red Part 3005 Element 300521 ×24
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×32
  • Brick 1 x 3 Red Part 3622 Element 362221 ×10
  • Brick 1 x 4 Red Part 3010 Element 301021 ×10
  • Brick 1 x 6 Red Part 3009 Element 300921 ×6
  • Brick 1 x 8 Red Part 3008 Element 300821 ×2
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×6
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×4
  • Brick 2 x 4 Red Part 3001 Element 300121 ×8
  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 Also in White ×4
  • Brick 1 x 2 Trans-Clear Part 3004 Element 4256587 or 300410 Also in White ×4
  • Brick 1 x 4 Trans-Clear Part 3010 Element 4256588 or 4227529 Also in White ×2
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 Also in Trans-Clear ×26
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 Also in Trans-Clear ×32
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×10
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 Also in Trans-Clear ×12
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×8
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×2
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×6
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×4
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×8
  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×26
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×34
  • Brick 1 x 3 Yellow Part 3622 Element 362224 ×10
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×10
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×8
  • Brick 1 x 8 Yellow Part 3008 Element 300824 ×2
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×6
  • Brick 2 x 3 Yellow Part 3002 Element 300224 ×6
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×8
  • Brick 2 x 8 Yellow Part 3007 Element 4639693 or 300724 ×1

Bricks Sloped 70 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×4
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×4
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Black Part 3747a ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×4
  • 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 ×4
  • Brick Sloped 33° 3 x 2 Red Part 3298 Element 329821 ×6
  • Brick Sloped 33° 3 x 4 Red Part 3297 Element 329721 ×6
  • Brick Sloped 45° 2 x 1 with Bottom Pin Red Part 3040b Element 4121934 or 304021 ×4
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×6
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Red Part 3747a Element 374721 ×2
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×6
  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×2
  • Brick Sloped 65° 2 x 2 x 2 Smooth without Bottom Tube Trans-Clear Part 3678a Element 4190879 or 367840 ×4
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×4
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Yellow Part 3747a ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Yellow Part 3660 Element 366024 ×4

Plates 45 pieces

  • Plate 1 x 3 Blue Part 3623 Element 362323 ×2
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×2
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×2
  • Plate 1 x 8 Blue Part 3460 Element 346023 ×2
  • Plate 2 x 16 Blue Part 4282 Element 6481432 or 4595188 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×4
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2
  • Plate 4 x 10 Blue Part 3030 Element 303073 or 303023 ×1
  • Plate 4 x 6 Blue Part 3032 Element 303223 ×1
  • Plate 6 x 8 Blue Part 3036 Element 303673 or 303623 ×1
  • Plate 1 x 3 Red Part 3623 Element 362321 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×4
  • Plate 1 x 6 Red Part 3666 Element 366621 ×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 6 Red Part 3795 Element 379521 ×2
  • Plate 2 x 8 Red Part 3034 Element 303421 ×2
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×1
  • Plate 4 x 6 Red Part 3032 Element 303221 ×1
  • Plate 4 x 8 Red Part 3035 Element 303521 ×1
  • Plate 6 x 8 Red Part 3036 Element 303671 or 303621 ×1

Windows and Doors 35 pieces

  • Window 1 x 2 x 2 Shutter Blue Part 3582 Element 358223 ×4
  • Window 1 x 2 x 3 Shutter Green Part 3856 Element 385628 ×10
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Red Part 3861b Element 386121 ×2
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Red Part 3081c01 Element 7026 ×4
  • Window 1 x 4 x 3 Red Part 3853 Element 385321 ×5
  • Window 1 x 2 x 3 Pane Yellow Part 3854 Element 385424 ×10

Wheels and Tyres 26 pieces

  • Brick Special 2 x 2 [Red Wheels for Single Tyre] Black Part 3137c01 ×4
  • Brick Special 2 x 4 with Wheel Holder Old, Clear Bottom, Red Inside Black Part 7049bc01 ×4
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×8
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×6
  • Wheel Old with 4 Studs Red Part 7039 Element 7039 ×4

Plants & Trees 19 pieces

  • Plant, Flower - Small Blue Part 3742 1 spare in the box ×3
  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×5
  • Plant, Pine Tree, Large, 4 x 4 x 6 2/3 Green Part 3471 Element 6248463 or 347128 ×2
  • Plant, Flower - Small Red Part 3742 1 spare in the box ×3
  • Plant, Flower - Small White Part 3742 1 spare in the box ×3
  • Plant, Flower - Small Yellow Part 3742 1 spare in the box ×3

Bars, Ladders and Fences 8 pieces

  • Antenna with Side Spokes Milky White Part 3144 ×1
  • Fence Lattice 1 x 4 x 1 Red Part 3633 Element 4187280 or 363321 ×6
  • Ladder 14 x 2.5 Yellow Part 4207 Element 420724 ×1

Bricks Curved 6 pieces

  • Brick Arch 1 x 4 Yellow Part 3659 Element 6310246 or 4280126 ×2
  • Brick Arch 1 x 6 x 2 - Thick Top with Reinforced Underside Yellow Part 3307 Element 330724 ×2
  • Brick Arch 1 x 8 x 2 Yellow Part 3308 Element 4501536 or 4189053 ×2

Plates Special 5 pieces

  • Bracket 2 x 2 - 2 x 2 Blue Part 3956 Element 6019215 or 395623 ×2
  • Plate Special 1 x 4 with Towball Red Part 3184 Element 318421 ×1
  • Plate Special 1 x 4 with Towball Socket, Long, 2 Slots Red Part 3183a ×1
  • Plate Special 3 x 2 with Rounded End, Hole Red Part 3176 Element 4188189 or 317621 ×1

Bricks Special 4 pieces

  • Brick Special 1 x 1 x 2 with Shutter Holder Red Part 3581 Element 4207299 or 358121 ×4

Transportation - Sea and Air 4 pieces

  • Propeller 2 Blade Black Part 3480 ×2
  • Plate Special 2 x 2 with Helicopter Tail Rotor Holder Red Part 3481 ×2

Hinges, Arms and Turntables 3 pieces

  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Red Part 3149bc01 Element 4188477 or 4106942 ×2
  • Turntable 4 x 4 Square Base with Top, Complete Assembly Red Part 3403c01 Element 4221665 or 4143678 ×1

Baseplates 2 pieces

  • Baseplate 16 x 16 Green Part 3867 Element 4217115 or 609828 ×2

Bricks Round and Cones 2 pieces

  • Brick Round 1 x 1 Open Stud Yellow Part 3062b Element 306844 or 306224 ×2

String, Bands and Reels 2 pieces

  • String Cord Medium Thickness 50cm Black Part 7916c50 ×1
  • String Reel Winch 2 x 4 x 2 (Light Gray Drum) Red Part 73037 Element 4190523 or 4109857 ×1

Tools 2 pieces

  • Motor Wind-Up 4 x 10 x 3 Key Red Part 4234 ×2

Windscreens and Fuselage 2 pieces

  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×2

Mechanical 1 piece

  • Windup Motor Red Part 384 ×1

Supports, Girders and Cranes 1 piece

  • Hook, Plate 1 x 2 with Crane Hook Left Red Part 3127 Element 4120019 ×1

Technic Bricks 1 piece

  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×1

Minifigures 2 figures

  • Man, White Torso, Black Legs, Brown Hair Minifigure, checked as a whole figure ×1
  • Woman - Red Torso, Light Gray Legs 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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