If you're serious about LEGO investing and you haven't considered Modular Buildings, you're missing the most consistently profitable theme in the entire LEGO catalogue. Since the series launched in 2007, retired Modular Buildings have averaged an annualised growth rate of approximately 17% — a figure that has remained remarkably stable across nearly two decades and through multiple economic cycles.
This is not a coincidence. The Modular Buildings series has a structural investment case that doesn't depend on licensing deals, pop culture timing or minifigure luck. It's built into the design of the product itself. Understanding why helps you invest in Modulars with conviction rather than guesswork.
What is a LEGO Modular Building? Modular Buildings are large-scale adult-oriented LEGO sets designed to connect with each other at standard stud spacing, forming an expandable street scene. LEGO releases one new Modular Building per year, typically in January. Each features multiple floors, detailed interiors, and removable roofs. They have been part of the LEGO Icons theme (previously Creator Expert) since 2007.
Why Modulars consistently outperform
Three structural factors combine to make the Modular Buildings series the most reliable long-term investment theme in LEGO:
One release per year. Unlike Star Wars or Harry Potter where dozens of sets release annually, there is exactly one new Modular Building each year. This scarcity is built in at the production level — collectors who want a complete street scene need every year's release. Miss one and you're forced onto the secondary market.
Only the most recent three to four are available at retail. LEGO's policy is to keep only the latest few Modular Buildings in production at any time. Once a set exits the active catalogue it's gone from retail permanently. This creates a hard supply cap that drives secondary market appreciation every single time.
The collector base is highly motivated. Modular Building collectors are typically adult LEGO enthusiasts (AFOLs) with real disposable income, a genuine passion for the theme, and a strong desire to complete the series. When a set retires, existing collectors who missed it create sustained demand that doesn't fade.
💡 The street scene effect
Because Modular Buildings are designed to connect with each other, collectors who have built a street scene of five or six sets have a strong psychological incentive to keep buying new ones and to track down older ones they missed. This creates a natural buyer pool that renews itself every year as the series grows.
The series at a glance — a brief history
The Modular Building series launched in 2007 with the Café Corner (10182) — which now trades at over AU$3,000 for a sealed copy from an original RRP of around $150. Since then, LEGO has released one set per year through three eras:
Currently available at LEGO.com AU
At any given time, LEGO keeps approximately three to four Modular Buildings available at retail. Here are the three currently on shelves:
✅ Available Now
The 2026 entry to the Modular Buildings series features two connected buildings — a music shop and a furniture store — joined by a central alleyway, giving it an unusual and striking footprint compared to traditional Modulars. At AU$399.99 it's the most expensive Modular Buildings set released to date, a reflection of price increases across the range. Reviews are mixed on the design compared to the beloved 2025 Tudor Corner, but from an investment perspective that matters less than the structural fact that every Modular Building appreciates post-retirement. Buy two: one to build, one to hold sealed.
✅ Available Now
The 2025 Modular Building and — by wide consensus among the AFOL community — one of the finest sets in the series' 19-year history. The Tudor Corner's timber-framed architecture, immersive interiors and exceptional build quality have made it an instant favourite. From an investment perspective it has everything: it's a corner piece (which commands a premium due to display flexibility), it's the current year's set meaning retirement is 2–3 years away, and its reputation almost guarantees strong post-retirement demand. At AU$349.99 it's also AU$50 cheaper than the 2026 Shopping Street for a comparable piece count — outstanding value.
✅ Available Now
The 2024 Modular Building is the largest ever released by piece count, with 4,014 bricks making it a genuinely impressive build. The Olive Green Georgian museum facade houses detailed exhibits across two floors — including a towering brachiosaurus skeleton visible through the dual skylights. At AU$449.99 it's the most expensive Modular currently available, but the piece count and the fact it's approaching retirement make it compelling. Having been on shelves since December 2023, it is likely within 12–18 months of retirement — meaning investors who want it at RRP need to move.
The investment strategy for Modulars
The standard advice from experienced Modular investors is simple and consistent: buy two of every new release. Build one, store one sealed. The build gives you the experience and the display piece. The sealed copy is your investment.
For Australian collectors on a tighter budget, prioritise the set that is furthest through its production life — because that's the one closest to retirement and the start of secondary market appreciation. Right now that's the Natural History Museum (2024 release), followed by Tudor Corner (2025), then Shopping Street (2026).
💡 The two-copy strategy
Buying two copies of each Modular at retail and holding one sealed is a well-established strategy in the LEGO investment community. The build copy gives you the hobby experience. The sealed copy builds value. If budget only allows one copy, buy sealed and enjoy the investment rather than the build.
What about retired Modulars?
If you want to collect retired Modulars you'll need the secondary market — BrickLink, eBay AU, or Facebook LEGO trading groups. Be prepared to pay significant premiums. The Jazz Club (10312, retired Dec 2025) is already trading above its AU$349.99 RRP. The Boutique Hotel (10297, retired Dec 2025) is climbing. Sets from the 2010s are now in the AU$600–1,500+ range. The original six from the 2007–2012 era are AU$1,200–3,000+.
For investment purposes, buying on the secondary market reduces your margin significantly. The real money in Modular investing is made by buying at retail and holding through retirement.
⚠️ Investment disclaimer
Past performance of the Modular Buildings series does not guarantee future appreciation. Prices shown are LEGO AU RRP — secondary market values fluctuate. LEGO investing involves real financial risk. This content is for informational purposes only and does not constitute financial advice.
The bottom line on Modulars
The LEGO Modular Buildings series is the closest thing to a reliable, structured investment product in the LEGO catalogue. One release per year. Hard supply cap at three to four retail sets at any time. A passionate and financially capable collector base. An 18-year track record of consistent post-retirement appreciation.
For Australian collectors starting a LEGO investment portfolio, the three currently available Modular Buildings — Shopping Street, Tudor Corner and Natural History Museum — are the most straightforward starting point available. All three will retire eventually. All three will appreciate. The only question is whether you buy them at LEGO AU RRP or on the secondary market at a premium.