Duplo is usually the first to be outgrown — those chunky bricks are for toddlers, so once the kids move on to regular LEGO (or beyond), a big tub of Duplo tends to sit unused. The good news: yes, it's generally worth something. The one thing to know upfront: it's not something BrickBuy buys.
Yes, Duplo generally sells
Duplo is made by LEGO and is in constant demand from younger families — there's always a new wave of toddlers, and parents love that it's hard-wearing and safe for little hands. That steady demand means outgrown Duplo typically holds real second-hand value rather than being landfill.
Why BrickBuy doesn't buy it
Duplo uses a larger, different brick format built for toddlers rather than the standard LEGO System bricks that make up sets, minifigures and loose bricks. BrickBuy is set up specifically around that standard system, so Duplo falls outside what we buy or price — it's sorted out and can't be included if it's mixed into a submission.
Where to actually sell it
Big Block Exchange specialises in Duplo and other pre-school sets, so that's the better home for it rather than letting it sit in a box. Loose, mixed Duplo is typically valued by weight there too, much like regular LEGO — complete themed sets, trains and figures are usually worth a little more individually, and a quick clean before you send it tends to help the price.
Got standard LEGO sets or bricks too?
If the same clear-out turned up regular LEGO sets, minifigures, or loose bricks alongside the Duplo, that part is exactly what BrickBuy buys — sealed, complete, or incomplete, sorted or not.