LEGO 404 Building Set is a vintage Universal Building Set set from 1977 valued at $406 for new and sealed sets, up 914% from an original retail price of $39.99. Annual appreciation has averaged 4.86% since release. Used copies are valued between $280 and $385 depending on condition.

Set Value (New/Sealed)

This chart represents the current new/sealed value of the set Building Set since January 2017. Medium accuracy
LEGO 404-1 Building Set is a Universal Building Set/Basic Set released in 1977, containing 467 pieces and 3 LEGOLAND figures. It was a U.S.-exclusive release and is equivalent to set 912 Universal Building Set / Advanced Basic Set with Motor. The assortment includes black, red, yellow, blue, light gray, and trans-clear elements such as bricks, plates, slopes, wheels, hinges, rubber bands, and string, plus a black 4.5V battery box compatible with 1-prong and 2-prong connectors. Notable parts include a black Technic link chain with 48 studded links and a yellow crane bucket with a spring mechanism, and the figures appear in blue and white color schemes.

A new and sealed Building Set is currently valued at around $406, with annual growth of approximately 5%. The average used price is $337 for those in good overall condition. Based on current trends, this set could be valued near $425 within the next year. The 3 included minifigs account for approximately 10% of the set's total value.
It has been a few months since we last saw 404 Building Set available in either primary or secondary markets. Its true value may be slightly higher than our current estimate. The last brand new Building Set was sold on eBay.
There are currently no new/sealed listings available for Building Set at this time.
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Sets in Universal Building Set / Basic Set

402 Building Set

Year 1977
Pieces / Minifigs 401 / 4
Availability Retired
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114 Building Set

Year 1977
Pieces 390
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400 Building Set

Year 1977
Pieces / Minifigs 294 / 3
Availability Retired
400 LEGO Building Set
Retail $24.99
Value $440.10
Growth  +1661.1%
Annual growth 6.0%

113 Building Set

Year 1977
Pieces 293
Availability Retired
113 LEGO Building Set
Retail $16.99
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Growth  +603.1%
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112 Building Set

Year 1977
Pieces 200
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112 LEGO Building Set
Retail $18.99
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Growth  +1075.4%
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111 Building Set

Year 1977
Pieces 173
Availability Retired
111 LEGO Building Set
Retail $12.99
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Growth  +1100.3%
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110 Building Set

Year 1977
Pieces 131
Availability Retired
110 LEGO Building Set
Retail $9.99
Value $269.99
Growth  +2602.6%
Annual growth 7.2%