LEGO value depends on the exact set number, whether the box is still sealed, and whether a used copy is complete. A loose bag of mixed bricks and a retired, sealed set are different markets. Photograph the box or the built set and any set number you can find, then compare current public listings.
The app scans faster, keeps a history of your items and gives free weekly scans.
Example
LEGO Architecture 21013 Big Ben, assembled
Set number, whether it is complete, and whether the box and instructions survive all move the price
An assembled LEGO Architecture 21013 Big Ben set. Retired Architecture sets can list differently from a current set still on shop shelves. Photograph the box, the set number, and any missing pieces if you know them. Photo: Lego Architecture 21013 - Big Ben (7975818228).jpg by InSapphoWeTrust, licensed under CC BY-SA 2.0, via Wikimedia Commons. See also photo credits.
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How to identify it
The set number comes first, not a remembered theme name. LEGO's own help page on identifying set and piece numbers, checked on 11 November 2026, says the company uses numbers to tell similar set names apart. Early sets used three-digit numbers; current set numbers are five to seven digits long and are featured prominently on the box and the instructions. You can also find the set number while browsing LEGO.com.
If you no longer have the box, look at the instruction booklet, a sticker sheet, or a unique printed piece or minifigure. Photograph those details. A built set without a number can still be identified from distinctive parts, but mixed bulk bricks from several sets should not be priced as one complete set. Not sure which set you have? Snap a photo of the box or the built model and the app reads the details so you can confirm them.
Sealed, used complete, incomplete, and minifigures
A factory-sealed box, a used but complete set with instructions, an incomplete set, and a loose minifigure are four different listing sets. Do not describe a used set as sealed. If figures, unique printed parts, or the instructions are missing, say so. Loose minifigures can sell on their own, but only when you identify the exact figure, not a generic "space guy."
Condition and packaging
Box crush, sun fade, and broken seals move a sealed listing. On used sets, missing parts and substitute bricks matter more than a little scuffing on a common slope. Do not rebuild a set with random spare parts and list it as original-complete. If you have checked the parts against the inventory, mention that honestly.
Listed versus sold
Retired sets sometimes list for more than the last official retail price, and sometimes they do not. New sets that are still easy to buy from the shop often sit near, or even under, retail once you subtract selling fees. We will not invent a retired-set price guide. The useful check is current public listings for that exact set number and condition. Asking prices can sit above a sold price, especially for bulky sets that are expensive to ship.
When we find enough listings, we show them so you can see the spread. If listings are thin, we label a rough estimate rather than inventing a precise number. See How we price.
Where to sell
People sell sets on eBay, Facebook Marketplace, specialist brick marketplaces, and at local fairs. The app can draft a listing for eBay, Facebook Marketplace, or Gumtree. Shipping cost can swallow the margin on a large, heavy box, so local pickup is often the practical route. In the UK, Australia, or Canada, compare local listings; a US asking price may not cover your postage.
Scan and list
- Photograph the box front and the set number, or the built set plus instructions or unique parts if the box is gone.
- Confirm the set number and whether it is sealed, used complete, or incomplete, then edit anything that looks off.
- Review the Worth about figure and the listed range when we find enough current public listings.
You can start with a free web scan in the box on this page.
Bulk lots are hard to price as a single set. If you are selling a mixed tub, say that clearly and do not borrow a famous set number. For another closet toy that often gets overstated asking prices, see Beanie Baby value.
The app scans faster, keeps a history of your items and gives free weekly scans.
What makes How Much Is It Worth different
One photo is enough to start, and you can add up to two more angles. We identify the item first, you confirm or correct it, then we look up a Worth about figure and a listed range from current public marketplace listings. Those are asking prices, which can sit above what a piece finally sells for. You see the listings themselves when we find enough of them.
Coins and banknotes also draw on Numista. Trading cards use PokéWallet, with a source credit where that data appears. Gold and silver use a live metal price as a floor. If listings are thin, we show a clearly labelled rough estimate rather than inventing a precise number. The app can draft a listing for eBay, Facebook Marketplace, or Gumtree once you are ready to sell. For the short version of this process, read How we price.
FAQ
How much is my LEGO set worth?
LEGO value depends on the exact set number, whether the box is still sealed, and whether a used copy is complete. A mixed tub of bricks is not the same market as a retired, sealed set. Photograph the box or the built set, then compare current public listings for that set number and condition.
Where do I find the set number?
LEGO's own help page, checked on 11 November 2026, says set numbers are featured prominently on the box and the instructions, and that current numbers are five to seven digits long. Early sets used shorter numbers. If the box is gone, look at the instructions or distinctive printed pieces.
Are loose minifigures worth selling on their own?
Sometimes, but only when you identify the exact figure. A sealed set, a used complete set, an incomplete set, and a loose minifigure should not share one listing. We will not invent a minifigure price list.
Can I scan a LEGO set with the app?
Yes. Photograph the box and the set number, or the built set and unique parts, then confirm whether it is sealed, used complete, or incomplete. We look at current public listings and label a rough estimate if matches are thin.
Related guides
Sources
- LEGO, “Identifying LEGO set and piece numbers,” LEGO Customer Service, accessed 11 November 2026. Set numbers appear on the box and instructions; current numbers are five to seven digits long.
LEGO, the LEGO logo, and minifigure are trademarks of the LEGO Group, which does not sponsor, authorise, or endorse this site or the How Much Is It Worth app.
Updated 11 November 2026. Written by Harris, who built How Much Is It Worth. Figures that we cite include a source and a date. They are not a certified appraisal. See How we price.
The app scans faster, keeps a history of your items and gives free weekly scans.
See all guides on the homepage, or read how we price.