LEGO Building Set, 6+ 404-1
LEGO Building Set, 6+ (404-1) is worth about $350 on the secondary market today, against a $216 retail price. It has 467 pieces, belongs to the Universal Building Set theme and was released in 1977. This set has retired — LEGO no longer produces it, so supply is fixed and prices are set entirely by the resale market.
- Set number
- 404-1
- Theme
- Universal Building Set
- Year
- 1977
- Pieces
- 467
- Minifigures
- 3
- RRP
- $216
- Market value
- $350
- Retirement
- Retired
Minifigures in LEGO Building Set, 6+
Building Set, 6+ value by year
From $36 in 2016 to $339 in 2026 so far: +842%. Its highest year was 2025, at $344.
| Year | Value | Change |
|---|---|---|
| 2026 (so far) | $339 | −1.3% |
| 2025 | $344 | +3.2% |
| 2024 | $333 | +3.6% |
| 2023 | $321 | +3.0% |
| 2022 | $312 | +2.7% |
| 2021 | $304 | −0.2% |
| 2020 | $304 | +3.0% |
| 2019 | $296 | +1.2% |
| 2018 | $292 | +6.0% |
| 2017 | $275 | +664.5% |
| 2016 | $36 | — |
Median of each year's market prices, sealed, in US dollars.
What you are paying for
Its 2 priced minifigures are worth about $5 together, roughly 1% of the set's value — low for sets with minifigures, so the value is in the sealed set rather than the figures (typically 24%).
Frequently asked questions
How much is LEGO Building Set, 6+ (404-1) worth?
LEGO Building Set, 6+ is worth approximately $350 on the secondary market today, based on current listings and completed sales. BrickStats updates this value daily.
Is LEGO Building Set, 6+ retired?
Yes — Building Set, 6+ (404-1) has been retired by LEGO and is no longer in production. Retired sets have fixed supply, which is why their prices are driven purely by the resale market.
Has LEGO Building Set, 6+ gone up in value?
Yes. Building Set, 6+ launched at $216 and now trades around $350, an increase of 62.3%. See the price history chart for how it got there.
What is the price per piece for Building Set, 6+?
At its $216 retail price across 467 pieces, Building Set, 6+ works out to about $0.463 per piece. Collectors often use price per piece to judge whether a set is good value.
Is LEGO Building Set, 6+ a good investment?
Building Set, 6+ currently trades 62.3% above its $216 retail price, and it is retired, so no new supply is entering the market. Past performance is not a prediction — condition, packaging and how long you hold all affect what a set actually sells for. BrickStats reports the numbers rather than giving investment advice.
Why is LEGO Building Set, 6+ so expensive?
Building Set, 6+ was released in 1977 and has since retired. Once LEGO stops producing a set, the only supply is what is already in circulation, so sealed copies in good condition compete for a shrinking pool of stock. That scarcity, not the parts, is what moves the price.