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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

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725 Basic Building Set

432 pieces in 135 part and color combinations, plus 2 minifigures.

LEGO counts 420 pieces. This inventory comes from a separate parts catalog and lists 440, 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 132 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 1 x 1 Blue Part 3005 Element 300523 ×2
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×2
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×2
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×1
  • Brick 1 x 2 Light Gray Part 3004 Element 300402 ×2
  • Brick 1 x 1 Red Part 3005 Element 300521 ×2
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×2
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×1
  • Brick 1 x 2 Trans-Clear Part 3004 Element 4256587 or 300410 Also in White ×2
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×24
  • Brick 1 x 1 x 5 with Blocked Open or Hollow Stud White Part 2453a ×2
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 Also in Trans-Clear ×22
  • Brick 1 x 2 x 5 with Blocked Open Studs and Bottom Stud Holder with Asymmetric Ridges White Part 2454a ×2
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×18
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×16
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×10
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×6
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×6
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×2

Bricks Sloped 77 pieces

  • Brick Sloped 45° 2 x 1 with Bottom pin, with White Rotary Dial Print Black Part 3040bpr0004 ×1
  • Brick Sloped 33° 3 x 2 Red Part 3298 Element 329821 ×4
  • Brick Sloped 33° 3 x 4 Red Part 3297 Element 329721 ×4
  • Brick Sloped 45° 2 x 1 Triple with Ovoid Bottom Pin Red Part 3048c Element 4195004 or 304821 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Red Part 3040b Element 4121934 or 304021 ×6
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×8
  • Brick Sloped 45° 2 x 2 Double Red Part 3043 Element 304321 ×2
  • Brick Sloped 45° 2 x 2 Double Convex Red Part 3045 Element 4163087 or 304521 ×8
  • Brick Sloped 45° 2 x 3 Double Red Part 3042 Element 304221 ×2
  • Brick Sloped 45° 2 x 4 Red Part 3037 Element 303721 ×8
  • Brick Sloped 45° 2 x 4 Double Red Part 3041 Element 4144003 or 304121 ×2
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×4
  • Brick Sloped Inverted 45° 2 x 2 Double Convex Red Part 3676 Element 4615887 or 4541254 ×8
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×2
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×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

Plates 39 pieces

  • Plate 1 x 2 Blue Part 3023 Element 302323 ×2
  • Plate 1 x 3 Blue Part 3623 Element 362323 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×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 8 Red Part 3034 Element 303421 ×2
  • Plate 4 x 6 Red Part 3032 Element 303221 ×1
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×4
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×2
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×2
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×2
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×2
  • Plate 4 x 10 White Part 3030 Element 6550137 or 4503008 ×1
  • Plate 4 x 12 White Part 3029 Element 4168072 or 302901 ×2
  • Plate 4 x 4 White Part 3031 Element 6552127 or 4243812 ×2
  • Plate 4 x 6 White Part 3032 Element 303201 ×1

Windows and Doors 30 pieces

  • Door 1 x 3 x 1 Left Blue Part 3822 Element 4586544 or 382223 ×1
  • Door 1 x 3 x 1 Right Blue Part 3821 Element 4586547 or 4141585 ×1
  • Window 1 x 2 x 3 Pane Latticed Blue Part 2529 Element 4114540 ×4
  • Door 1 x 4 x 5 Right with 6 Panes Red Part 73312 Element 73312 ×2
  • Door 1 x 4 x 6 Red Part 3644 Element 4189056 or 364421 ×2
  • Window 1 x 2 x 2 Classic, Short Lip [with Glass] Red Part 3081c01 Element 7026 ×4
  • Window 1 x 2 x 3 Shutter Red Part 3856 Element 4189092 or 385621 ×4
  • Window 1 x 4 x 3 Red Part 3853 Element 385321 ×2
  • Window 1 x 4 x 5 with Hollow Studs Red Part 2493b Element 4100415 ×2
  • Window 4 x 4 x 3 Roof Red Part 4447 Element 4279678 ×2
  • Glass for Window 1 x 4 x 3 Trans-Clear Part 3855 Element 4556520 or 4203330 ×2
  • Glass for Window 1 x 4 x 5 Trans-Clear Part 2494 Element 4114269 or 249440 ×2
  • Glass for Window 4 x 4 x 3 Roof Trans-Clear Part 4448 Element 4522040 or 4161146 ×2

Plants & Trees 29 pieces

  • Plant, Flower - Small Blue Part 3742 ×4
  • Plant, Palm Tree Base Brown Part 2563 Element 4160960 or 256325 ×1
  • Plant, Palm Tree Trunk - Short Connector, no Axle Hole Brown Part 2536b ×8
  • Plant, Flower Stem Green Part 3741 Element 6277589 or 374128 ×4
  • Plant, Palm Leaf Large 10 x 5 Green Part 2518 Element 4160957 or 251828 ×4
  • Plant, Flower - Small Yellow Part 3742 ×8

Bars, Ladders and Fences 14 pieces

  • Bar, 4 Top Bars, Palm Tree Top Brown Part 2566 Element 4177831 or 256625 ×1
  • Antenna 1 x 4 with Rounded Top Red Part 3957a Element 4280153 or 395721 ×2
  • Fence Lattice 1 x 4 x 1 Red Part 3633 Element 4187280 or 363321 ×6
  • Fence Lattice 1 x 4 x 2 Red Part 3185 Element 318521 ×2
  • Bar 1 x 4 x 2 with Studs White Part 4083 Element 408301 ×1
  • Lamp Post 2 x 2 x 7 with 6 Base Flutes White Part 2039 Element 4119500 or 4107861 ×2

Bricks Round and Cones 14 pieces

  • Brick Round 1 x 1 Open Stud Blue Part 3062b Element 306223 ×4
  • Brick Round 1 x 1 Open Stud Green Part 3062b Element 306228 ×1
  • Brick Round 1 x 1 Open Stud Red Part 3062b Element 306221 ×2
  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×2
  • Cone 2 x 2 x 2, Blocked Open Stud Red Part 3942b ×1
  • Brick Round 1 x 1 Open Stud Trans-Yellow Part 3062b Element 6514236 or 6238674 ×2
  • Cone 1 x 1 [No Top Groove] White Part 4589 Element 458901 ×2

Tiles 14 pieces

  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×4
  • Tile 1 x 4 with Groove Blue Part 2431 Element 243123 ×4
  • Tile 1 x 8 with Groove Blue Part 4162 Element 416223 ×2
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×2

Panels 10 pieces

  • Panel 3 x 4 x 6 Curved Top Trans-Clear Part 2571 Element 6510166 or 6422090 ×2
  • Panel 3 x 3 x 6 Corner Wall White Part 2345 Element 234501 ×8

Bricks Wedged 8 pieces

  • Brick Wedged 3 x 3 Facet White Part 2462 Element 6619281 or 6056272 ×8

Hinges, Arms and Turntables 8 pieces

  • Turntable 2 x 2 Plate, Base Blue Part 3680 Element 368023 ×2
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2
  • Hinge Brick 1 x 4 [Lower] White Part 3831 Element 6619285 or 383101 ×2
  • Hinge Brick 1 x 4 [Upper] White Part 3830 Element 6327411 or 6011456 ×2

Plates Round Curved and Dishes 8 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Green Part 4032a Element 403228 ×1
  • Dish 2 x 2 Inverted [Radar] White Part 4740 Element 6601845 or 474001 ×2
  • Dish 4 x 4 Inverted [Radar] with Blue and Red Stripes Print Space Radar White Part 3960pr9987 Element 4143709 or 80193 ×1
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2

Wheels and Tyres 8 pieces

  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×4
  • Wheel 8 x 6 White Part 4624 Element 462401 ×4

Minifig Accessories 6 pieces

  • Equipment Frying Pan Black Part 4528 Element 452826 ×1
  • Equipment Saucepan Black Part 4529 Element 452926 ×1
  • Equipment Brush / Push Broom Brown Part 3836 Element 383625 ×1
  • Equipment Goblet / Glass Trans-Clear Part 2343 Element 6166107 or 3000240 ×2
  • Tap 1 x 2 Base with Light Gray Spout White Part 69c01 Element 4171368 ×1

Plates Special 6 pieces

  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×2
  • Plate Special 2 x 2 with Wheel Holders White Part 4600 Element 460001 ×2

Transportation - Land 6 pieces

  • Seat / Chair 2 x 2 Blue Part 4079 ×4
  • Wheel Arch, Mudguard 2 x 4 Studded Blue Part 3788 Element 4500520 or 378823 ×2

Containers 5 pieces

  • Cupboard 2 x 3 Drawer Red Part 4536 Element 453621 ×2
  • Cupboard 2 x 3 x 2 Door Red Part 4533 Element 453321 ×1
  • Cupboard 2 x 3 x 2 with Solid Studs Red Part 4532 Element 6106113 or 453221 ×2

Plates Wedged 4 pieces

  • Wedge Plate 3 x 3 Cut Corner White Part 2450 Element 6601842 or 4280148 ×4

Animal / Creature Accessories 2 pieces

  • Animal / Creature Accessory, Horse Hitching, 1 x 2 Plate and 2 x 2 Plate [Studded] Blue Part 2397 Element 4112913 or 239723 ×1
  • Animal / Creature Accessory, Saddle [One Clip] Red Part 4491a ×1

Animals / Creatures 2 pieces

  • Animal, Horse, Movable Head, Black Eyes Circled with White, Brown Bridle Print Black Part 4493c01pr0002 Element 4225611 or 4107518 ×1
  • Animal, Bird, Parrot with Coloured Feathers Print Red Part 2546pr0001 Element 81376 ×1

Baseplates 2 pieces

  • Baseplate 16 x 16 Light Gray Part 3867 Element 4217335 or 4206787 ×2

Bricks Curved 2 pieces

  • Brick Arch 1 x 6 x 2 - Thick Top with Reinforced Underside White Part 3307 Element 330701 ×2

Bricks Special 2 pieces

  • Brick Special 1 x 1 x 2 with Shutter Holder White Part 3581 Element 358101 ×2

Minifig Heads 2 pieces

  • Minifig Head [Plain] [Blocked Open Stud] Trans-Yellow Part 3626b Element 4190214 or 3001144 ×2

Flags, Banners and Signs 1 piece

  • Flag 4 x 1 Wavy [First Wave Left] Yellow Part 4495a ×1

Windscreens and Fuselage 1 piece

  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×1

Minifigures 2 figures

  • Man - Black Suit Minifigure, checked as a whole figure ×1
  • Woman - White Torso, Red Necklace, White 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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