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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

720 Basic Building Set

335 pieces in 123 part and color combinations, plus 1 minifigure.

LEGO counts 334 pieces. This inventory comes from a separate parts catalog and lists 339, 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 94 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×4
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×4
  • Brick 1 x 2 with Black Grill Print Red Part 3004pr9981 ×1
  • Brick 1 x 3 Red Part 3622 Element 362221 ×4
  • Brick 1 x 4 Red Part 3010 Element 301021 ×2
  • Brick 1 x 6 Red Part 3009 Element 300921 ×2
  • Brick 2 x 2 without Inside Ridges Red Part 3003a ×2
  • Brick 2 x 3 without Cross Supports Red Part 3002a ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×1
  • 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 ×4
  • Brick Sloped 45° 2 x 2 Double Red Part 3043 Element 304321 ×2
  • Brick Sloped 45° 2 x 3 Red Part 3038 Element 6303213 or 4195081 ×4
  • Brick Sloped 45° 2 x 4 Red Part 3037 Element 303721 ×4
  • Brick Sloped 45° 2 x 4 Double Red Part 3041 Element 4144003 or 304121 ×1
  • Brick Sloped 45° 2 x 8 Red Part 4445 Element 4550322 or 4239184 ×6
  • Brick Special 1 x 1 with Headlight Red Part 4070 Element 407021 ×4
  • Door 1 x 3 x 1 Left Red Part 3822 Element 4288209 or 4188202 ×1
  • Door 1 x 3 x 1 Right Red Part 3821 Element 4537986 or 4288208 ×1
  • Door 1 x 3 x 2 Left Red Part 3189 Element 4121824 ×1
  • Door 1 x 3 x 2 Right Red Part 3188 Element 4121823 ×1
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Red Part 3861b Element 386121 ×1
  • Flag 4 x 1 Wavy [First Wave Left] Red Part 4495a ×1
  • Hinge Brick 1 x 2 Base Red Part 3937 Element 393721 ×1
  • Hook, Plate 1 x 2 with Crane Hook Left Red Part 3127 Element 4120019 ×1
  • Plant, Flower - Small Red Part 3742 1 spare in the box ×3
  • Plate 1 x 1 Red Part 3024 Element 302421 Also in Trans-Red ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×4
  • Plate 1 x 3 Red Part 3623 Element 362321 ×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 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 6 Red Part 3032 Element 303221 ×1
  • Plate 6 x 10 Red Part 3033 Element 6509008 or 6249097 ×2
  • Plate Special 1 x 8 with Door Rail Red Part 4510 Element 6078594 or 4616360 ×4
  • Vehicle Base 4 x 5 with Wheel Arches, 2 x 2 Opening Red Part 4211 Element 4261132 or 421121 ×1
  • Wheel Arch, Mudguard 2 x 4 Studded Red Part 3788 Element 378821 ×1
  • Wheel Arch, Mudguard 2 x 4 [Smooth] Red Part 3787 Element 4190510 or 378721 ×1
  • Window 1 x 2 x 3 Pane Red Part 3854 Element 4175391 or 385421 ×4

White 86 pieces

  • Boat, Mast 2 x 2 x 9 2/3 Bar with Slot on Top and 2 Finger Hinge on Two Sides White Part 4318 ×1
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 Also in Trans-Clear ×16
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×10
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×8
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×6
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×4
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×2
  • Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×1
  • Brick 2 x 2 without Inside Ridges White Part 3003a ×5
  • Brick 2 x 3 without Cross Supports White Part 3002a ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×4
  • Brick Sloped Inverted 45° 2 x 1 White Part 3665 Element 6552106 or 366501 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×4
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×2
  • Door Sliding - Type 1 White Part 4511 Element 4198601 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×4
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×4
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×2
  • Plate 4 x 4 White Part 3031 Element 6552127 or 4243812 ×1

Blue 69 pieces

  • Brick 1 x 1 Blue Part 3005 Element 300523 ×6
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×6
  • Brick 1 x 3 Blue Part 3622 Element 362223 ×6
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×4
  • Brick 1 x 6 Blue Part 3009 Element 300923 ×6
  • Brick 1 x 8 Blue Part 3008 Element 300823 ×2
  • Brick 2 x 2 without Inside Ridges Blue Part 3003a ×2
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×1
  • Brick Sloped Inverted 45° 2 x 1 Blue Part 3665 Element 366523 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Blue Part 3660 Element 366023 ×4
  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Blue Part 3149bc01 Element 4106944 ×1
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×2
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×2
  • Plate 2 x 10 Blue Part 3832 Element 383223 ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×4
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2
  • Plate 4 x 8 Blue Part 3035 Element 303523 ×1
  • Plate 6 x 6 Blue Part 3958 Element 4199519 or 395823 ×1
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×4
  • Window 1 x 2 x 3 Shutter Blue Part 3856 Element 385623 ×4
  • Window 1 x 4 x 3 Blue Part 3853 Element 385323 ×4

Light Gray 40 pieces

  • Bar 1 x 4 x 2 with Studs Light Gray Part 4083 Element 408302 ×1
  • Baseplate 16 x 32 Light Gray Part 3857 Element 4219612 or 274802 ×1
  • Brick Round 1 x 1 Open Stud Light Gray Part 3062b Element 306202 ×6
  • Hinge Brick 1 x 2 Top Plate Thin Light Gray Part 3938 Element 393802 ×1
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Light Gray Part 4275b Element 427502 ×3
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top Light Gray Part 4531 Element 4256463 or 4163772 ×2
  • Plate 1 x 3 Light Gray Part 3623 Element 362302 ×2
  • Plate 1 x 8 Light Gray Part 3460 Element 346002 ×8
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thin Ring] Light Gray Part 4081a ×1
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Light Gray Part 3794a Element 379402 ×1
  • Plate Special 2 x 2 with Wheel Holders Light Gray Part 4600 Element 460002 ×2
  • Seat / Chair 2 x 2 Light Gray Part 4079 Element 407902 ×1
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×2
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×1
  • Wheel 8 x 6 Light Gray Part 4624 Element 462402 ×4
  • Wheel with Split Axle hole Light Gray Part 3482 Element 348202 ×4

Black 19 pieces

  • Hinge Vehicle Roof 4 x 4 Black Part 4213 Element 421326 ×1
  • Hinge Vehicle Roof Holder 1 x 4 x 2 Black Part 4214 Element 421426 ×1
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×1
  • Plate Special 3 x 2 with Rounded End, Hole Black Part 3176 Element 317676 or 317626 ×2
  • String Cord Medium Thickness 50cm Black Part 7916c50 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×1
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×4
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×4

Yellow 9 pieces

  • Brick Round 2 x 2 with Axle Hole Yellow Part 3941 Element 614324 or 394124 ×4
  • Construction Vehicle Bucket 2 x 3 Curved Bottom, Hollow, with Hinge 2 Fingers Yellow Part 4626 Element 462624 ×1
  • Plant, Flower - Small Yellow Part 3742 1 spare in the box ×3
  • Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×1

Trans-Clear 8 pieces

  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 Also in White ×4
  • Glass for Window 1 x 4 x 3 Trans-Clear Part 3855 Element 4556520 or 4203330 ×2
  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×1
  • Windscreen 2 x 6 x 2, Wide Top Trans-Clear Part 4176 Element 4502193 or 4179426 ×1

Trans-Yellow 4 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Yellow Part 6141 Element 6514056 or 6240216 ×4

Green 3 pieces

  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×2
  • Plant, Pine Tree, Large, 4 x 4 x 6 2/3 Green Part 3471 Element 6248463 or 347128 ×1

Trans-Red 2 pieces

  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 Also in Red ×2

Trans-Green 1 piece

  • Plate 1 x 1 Trans-Green Part 3024 Element 6513967 or 6252046 ×1

Minifigures 1 figure

  • Man - Black Torso, Blue Pants 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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