Sell your loose Duplo for cash
No sorting, no listing sets one by one — just weigh your Duplo and get an instant offer at £3.50 per kilo. Free postage, paid within 2 days.
No bathroom scales? A rough estimate is fine to start — we confirm the exact weight when it arrives.
Please make sure your parcel contains only genuine LEGO Duplo. We can't pay for clone brands (Mega Bloks, ELC and similar), other LEGO (including regular-size bricks), other toys, or anything mixed in that isn't Duplo — that's left out of your offer and can't be returned.
Got regular-size LEGO too? Our sister site BrickBuy buys that separately.
How it works
From weighing to cash in your account — the whole thing takes about 5 minutes of your time.
Weigh your Duplo
Kitchen or bathroom scales both work. No scales? A rough guess is fine to get started — we'll confirm the exact weight when it arrives.
See your instant offer
Enter the weight on our homepage and your offer appears straight away, at a flat £3.50 per kilo. No sorting, no listing, no waiting.
Add a photo and submit
A quick photo of your bag or box helps us confirm your offer faster — but it's optional, not required.
Post it for free
Accept your offer and we'll email a prepaid label. Bag it up and drop it at any Post Office or parcel point.
We weigh and check it
Once your parcel arrives, we weigh it and check it's genuine Duplo. If everything matches, your offer is confirmed.
Get paid
Payment goes straight to your bank account within 2 days of us confirming your offer. No cheques, no delays.
The easiest way to clear out the playroom
Selling loose Duplo piece by piece takes hours you don't have. Compare your options honestly.
Big Block ExchangeRecommended | eBay | Facebook | Charity shop | |
|---|---|---|---|---|
| Instant offer | Yes — seconds | No — wait for bids | No — wait for buyers | No cash back |
| Sorting required | None — sell it loose | Sort, photograph, list | Sort, photograph, list | None, but no payment |
| When you get paid | Within 2 days | 5–10 days | Unpredictable | Never |
| Postage | Free prepaid label | Reduces your payout | You arrange it | You drop it off |
| Buyer risk | None — we're the buyer | Disputes & returns | No-shows, strangers | None |
| Time commitment | Under 5 minutes | Hours of listing | Messages for days | A trip to drop off |