How to invest in LEGO: complete beginner's guide

Why LEGO gains in value

Unlike other toys, LEGO retires its sets from production after 2 to 5 years. This retirement creates an artificial but real scarcity: buyers who missed the retail price turn to the secondary market, driving prices up.

BrickLink data shows that a sealed Star Wars set gains an average of +65 to +80% in value within 24 months of retirement. The large UCS (Ultimate Collector Series) sets have even more impressive track records: the UCS Millennium Falcon (75192) traded as high as €1,100 on the secondary market against a retail price of €849.

The most profitable themes

Not all sets are equal. The themes with the best post-retirement ROI track record are, in order: Star Wars UCS, Icons (ex-Creator Expert), flagship Technic sets, and Botanical Collection.

The Star Wars theme benefits from a global fan base and a very active AFOLs community. The Icons theme targets adults with architectural or cultural sets that appeal to an audience who didn't play with LEGO as children. The Botanical Collection (Flower Bouquet, Bonsai, Orchid) has become a phenomenon since 2021, with post-retirement ROIs regularly exceeding +50%.

Sealed vs built: the impact on price

This is the golden rule: a sealed set (MISB — Mint In Sealed Box) is always worth more than a built or opened one. The premium varies by set and age, but generally ranges from +30% to +200% compared to the price of a complete set with box.

If you're buying to invest, don't build the set. Store it away from light and shocks. The box in good condition is as important as the set itself — a damaged box can reduce value by 20 to 40%.

The right time to buy

The optimal buying window is between 1 and 6 months before official retirement. At this point, the set is still at retail price (or slightly discounted at end of stock), but the retirement date is known and secondary demand is beginning to build.

Retirement dates are published on Brickset and viewable in Cault for all sets in your collection and wishlist. The automatic alert notifies you when a set approaches its retirement date.

The right time to sell

The strongest appreciation occurs in the 6 to 18 months following retirement. After this peak, appreciation slows and can stagnate for several years before resuming. Experienced investors often sell within this window to reinvest in newly retired sets.

Exceptionally, some sets (UCS Death Star, UCS Millennium Falcon) continue to appreciate over 5 to 10 years thanks to their iconic status. These cases are rare and difficult to anticipate.

Tracking your investments with Cault

Managing an investment LEGO collection in an Excel spreadsheet quickly becomes unmanageable: prices change, sets retire, and calculating your overall ROI by hand takes considerable time.

Cault connects BrickLink and Brickset to automatically update the value of each set in your collection. ROI, your portfolio curve, and price alerts give you a semi-real-time view of your LEGO portfolio — exactly like a financial portfolio.