LEGO Building Set, 6+ 400-1
LEGO Building Set, 6+ (400-1) is worth about $482 on the secondary market today. It has 294 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
- 400-1
- Theme
- Universal Building Set
- Year
- 1977
- Pieces
- 294
- Minifigures
- 3
- Market value
- $482
- Used value
- $38
- Retirement
- Retired
Minifigures in LEGO Building Set, 6+
Building Set, 6+ value by year
From $161 in 2014 to $462 in 2026 so far: +188%. Its highest year was 2026, at $462.
| Year | Value | Change |
|---|---|---|
| 2026 (so far) | $462 | +5.0% |
| 2025 | $440 | +7.0% |
| 2024 | $412 | +71.9% |
| 2023 | $239 | −10.2% |
| 2022 | $267 | −28.1% |
| 2021 | $371 | +42.9% |
| 2020 | $260 | −33.2% |
| 2019 | $389 | +1.7% |
| 2018 | $382 | +2.3% |
| 2017 | $374 | +2.4% |
| 2016 | $365 | +33.1% |
| 2015 | $274 | +70.6% |
| 2014 | $161 | — |
Median of each year's market prices, sealed, in US dollars.
What you are paying for
Its 2 priced minifigures are worth about $3 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+ (400-1) worth?
LEGO Building Set, 6+ is worth approximately $482 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+ (400-1) 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.
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.