Set 40815
Birthday Party Cake
On shelves nowRetail price$14.99What LEGO charged
Worth now$28.49Typical sealed asking price · 32 listings
Recently sold—No recent sales on file
vs retail+90%Worth more than it cost
Not at retail
At $15 retail there's no margin left — pay under $8.
How much is LEGO 40815 Birthday Party Cake worth?
LEGO 40815 Birthday Party Cake is worth about $28.49 sealed right now, based on 32 live sealed listings on eBay. That's 90% above its $14.99 retail price. It came out in 2025 with 219 pieces. It's still sold in shops. Over the last 89 days its typical asking price has risen 27%, from $22.45 to $28.49. We last checked it yesterday.
Price history
Value history
Oct 27$2832 listings
- Lowest
- $21
- Highest
- $30
- Change
- +27%
- Asking vs retail
- +90%
27 observations · median asking · rechecked 8× daily
Should you buy it?
Still on shelves at $15 and already worth $28 sealed. That’s the one to watch.
If you bought it to resell
Sells sealed for$28
Marketplace fees · 15.25%−$4
Payment processing · 2.9% + $0.30−$1
Shipping · est. from 219 pieces−$9
Reaches you$14
Pay no more than$11
For a 30% return at your costs. Change them and every figure on the site follows.
How long has it been on shelves?
Still early — released 2025, and sets like this usually run about 3 years. No hurry.
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.
Set details
- Set number
- 40815
- Theme
- Seasonal
- Released
- 2025
- Status
- On shelves now
- Pieces
- 219
- Minifigures
- —
- Retail price
- $14.99
- Value per piece
- $0.13
- Price confidence
- high · 32 listings
- Last checked
- yesterday
Where these numbers come from
eBay32 live listingsThe asking price here — the median of what sellers want right now, $28. Last checked Oct 27.See the listings →BrickLinkPrice guideNo completed sales recorded for this one yet. Last checked Oct 29.Open the price guide →Catalogue219 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $15.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 Seasonal sets from around 2025
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▲ 50% vs retail40809 · 2025Festive Gingerbread HouseSeasonal · 498 pcs$6039 listings · retail $40Not at retail
▲ 50% vs retail40807 · 2025Birthday NumbersSeasonal · 281 pcs$3020 listings · retail $20Not at retail