Set 40505
Building Systems
On shelves nowRetail price—Not on file
Worth now$177.67Typical sealed asking price · 11 listings
Recently sold$114.00Only 2 sales so far — too few to lean on
vs retail—Needs both prices
No retail price on file
Worth $178 today, but without a retail price there's nothing to judge that against.
How much is LEGO 40505 Building Systems worth?
LEGO 40505 Building Systems is worth about $177.67 sealed right now, based on 11 live sealed listings on eBay. It came out in 2024 with 1,211 pieces. It's still sold in shops. Over the last 89 days its typical asking price has fallen 14%, from $205.57 to $177.67. We last checked it yesterday.
Price history
Value history
Oct 27$17811 listings
- Lowest
- $174
- Highest
- $206
- Change
- -11%
- Asking vs retail
- —
27 observations · median asking · rechecked 8× daily
Should you buy it?
If you bought it to resell
Sells sealed for$178
Marketplace fees · 15.25%−$27
Payment processing · 2.9% + $0.30−$6
Shipping · est. from 1,211 pieces−$18
Reaches you$127
Pay no more than$97
For a 30% return at your costs. Change them and every figure on the site follows.
How long has it been on shelves?
Roughly 97% through a typical run for a set this size. Worth watching rather than rushing.
LEGO never announces retirement dates. This is only how long the set has been available against how long sets of its size usually run — not a prediction, and not inside information.
What it actually sold for
Sealed
$114
2 sold in six months · $108–$120Sellers are asking 56% more than buyers actually paid. The $178 figure above is a ceiling; this is the floor to negotiate toward.
Completed BrickLink transactions over the last six months. Real sales, not asking prices.
Worth more in pieces?
Parted out$142vsSealed$178
Sealed is worth 20% more. Not one to break.
- Minifigures
- —
- Loose parts
- 1,288 pieces
Minifigure prices are real completed BrickLink sales. The parts figure is an estimate — the set’s own inventory at the catalogue average, not each piece priced individually. Treat it as a guide, and remember parting out is hours of work and many small sales.
Set details
- Set number
- 40505
- Theme
- LEGO Exclusive
- Released
- 2024
- Status
- On shelves now
- Pieces
- 1,211
- Minifigures
- —
- Retail price
- —
- Value per piece
- $0.147
- Price confidence
- medium · 11 listings
- Last checked
- yesterday
Where these numbers come from
eBay11 live listingsThe asking price here — the median of what sellers want right now, $178. Last checked Oct 27.See the listings →BrickLink2 completed salesWhat it actually sold for — $114 across six months of real transactions. Last checked Oct 25.Open the price guide →Catalogue1,211 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset.See the catalogue entry →
eBay links are affiliate links — if you buy after clicking, we earn a small commission at no cost to you, and that is what pays for the site. BrickLink has no such programme, so those are plain links. Neither changes what we show or what we say about it.
How to read this. The value is the median of live sealed listings, after removing instructions, empty boxes, used sets, multi-set lots and implausible outliers. Real sale prices usually land below asking, so the buy-below figure is deliberately the conservative end of the range.
More LEGO Exclusive sets from around 2024
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