Last updated: 6 April 2026

LEGO Lamborghini Sián 42115 — Buy Sealed in the UK

The LEGO Technic Lamborghini Sián FKP 37 (42115) retired in late 2024. If you’re looking for a sealed one in the UK, they’re still available on the secondary market — but sealed supply is dropping. Current prices sit around £350–£400 for a factory-sealed box.

This is a 3,696-piece, 1:8 scale Technic build with a working V12 engine, 8-speed sequential gearbox, and Lamborghini’s signature scissor doors. It’s the largest and most detailed Lamborghini that LEGO has ever produced.

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What is the build experience like for the LEGO Sian 42115?

The LEGO Lamborghini Sian 42115 delivers one of the most sophisticated building experiences in the entire Technic lineup. You’re looking at 10-14 hours of focused construction time, depending on your experience with complex mechanical builds.

The journey begins with the V12 engine assembly — and what a beast it is. This isn’t just a static display piece.

The engine features moving pistons that cycle smoothly as you rotate the crankshaft. Each cylinder connects through proper connecting rods, creating that satisfying mechanical rhythm you’d expect from a supercar powerplant.

Building the sequential gearbox is where things get properly technical. The eight-speed transmission uses a complex arrangement of gear wheels and shift forks that actually function.

You can manually shift through all eight gears using the paddle shifters behind the steering wheel. The gear ratios change visibly as you work through the sequence, with the final drive connecting to both rear wheels through a functional differential.

The golden brake calipers deserve special mention. These aren’t simple cosmetic additions — they’re fully detailed assemblies that sit behind the distinctive Y-spoke wheels.

The brake discs rotate with the wheels, and the calipers position exactly where they would on the real Sian. Getting these positioned correctly requires patience, but the visual impact is worth every minute.

The rear spoiler mechanism showcases LEGO’s engineering brilliance. This active aerodynamic element deploys and retracts using a simple lever system.

The spoiler rises smoothly from its flush position to full deployment, mimicking the real car’s aerodynamic adjustments. The mechanism locks solidly in both positions, so your display choice stays put.

Suspension assembly brings another layer of complexity. All four wheels feature independent suspension with proper spring dampers.

The front wheels turn via rack-and-pinion steering connected to the cockpit steering wheel. The rear suspension handles the power delivery from that differential while maintaining the car’s aggressive stance.

The scissor door mechanism requires the most careful attention during construction. These aren’t simple hinged doors — they follow the exact opening pattern of the real Lamborghini.

Each door rotates upward and slightly forward, clearing the roof line perfectly. The mechanism stays balanced throughout the opening arc, and both doors align symmetrically when closed.

Interior detailing adds the finishing touches before you tackle the bodywork. The cockpit includes a detailed dashboard, racing seats, and that all-important gear shift mechanism.

The steering wheel connects directly to the front axle, giving you proper mechanical feedback when you turn the wheels. Even the door handles work — pull them to trigger the scissor door opening sequence.

Then comes the magical moment when you begin installing the bodywork panels. The Sian’s distinctive lime green elements start bringing the car’s aggressive lines to life.

Panel by panel, you watch those unmistakable Lamborghini curves emerge. The angular front splitter, the dramatic side air intakes, and that razor-sharp rear diffuser all click into place with satisfying precision.

The final bodywork installation reveals the complete sculpture. Those flowing lines that looked impossible to recreate in LEGO elements suddenly make perfect sense.

The lime green and black color scheme creates dramatic contrasts across every surface. The completed model captures the Sian’s aggressive stance and supercar proportions with remarkable accuracy.

How does the LEGO Sian compare to other Technic supercars?

The LEGO supercar lineup includes some absolute legends, but the Sian holds its own against every competitor. Here’s how it stacks up against the other Technic flagship supercars:

Set	Pieces	Mechanical Features	Display Size	Unique Elements
Lamborghini Sian 42115	3,696	V12 engine, 8-speed gearbox, active spoiler, scissor doors	60 x 25 x 13cm	Only set with scissor doors
Bugatti Chiron 42083	3,599	W16 engine, 8-speed gearbox, active rear wing	56 x 25 x 14cm	Unique W16 configuration
Ferrari 488 GTE 42125	1,677	V8 engine, sequential gearbox, adjustable spoiler	50 x 23 x 13cm	Racing livery and details
Porsche GT3 RS 42056	2,704	Flat-6 engine, PDK gearbox, working steering	57 x 25 x 17cm	Detailed racing interior

The Sian takes the crown for piece count and mechanical complexity. That 3,696-piece construction puts it ahead of even the legendary Bugatti Chiron.

More pieces translate directly into more detail and more sophisticated mechanisms. The scissor doors alone represent a mechanical achievement no other Technic supercar can match.

Engine configuration sets each model apart dramatically. The Sian’s V12 offers a completely different building experience compared to the Chiron’s complex W16 or the Porsche’s flat-six layout.

The Ferrari 488 GTE focuses on racing pedigree rather than raw complexity. Its lower piece count reflects a more streamlined build, but it lacks the mechanical sophistication of the flagship models.

Display presence varies significantly across the lineup. The Sian’s aggressive lime green bodywork creates visual impact that the more subdued Chiron blue or Porsche orange can’t quite match.

The Porsche stands tallest at 17cm, giving it commanding shelf presence. But the Sian’s 60cm length makes it the longest of the bunch, emphasizing that supercar profile perfectly.

Those scissor doors remain the Sian’s unique selling point in the Technic supercar world. No other set offers this iconic Lamborghini feature, making the 42115 the only choice for that authentic Italian supercar experience.

How big is the LEGO Sian 42115 and how should you display it?

The completed LEGO Lamborghini Sian measures 60cm long, 25cm wide, and 13cm high. That’s a substantial presence that demands proper display consideration.

Weight clocks in at approximately 2.8kg when fully assembled. You’re not moving this around casually — it needs a permanent display location that can handle both the size and mass.

Shelf requirements become critical with these dimensions. Standard bookshelf depths won’t accommodate the 25cm width, especially if you plan to display the scissor doors in their open position.

You need minimum 30cm shelf depth for comfortable placement. The doors add another 15cm of clearance requirement when fully opened, so factor in 45cm total depth if you want to show off that signature Lamborghini feature.

The lime green and black color scheme creates dramatic visual impact on display. This isn’t a subtle model that blends into the background.

The vibrant green bodywork demands attention and works best against neutral backgrounds. White or grey shelving lets the car’s colors pop without competing visual elements.

Lighting considerations enhance the display significantly. The metallic lime green elements catch and reflect light beautifully, creating depth across those angular body surfaces.

LED strip lighting or spotlighting brings out the contrast between the green bodywork and black structural elements. The golden brake calipers particularly benefit from proper illumination.

Dust protection becomes essential due to the open wheel arches and complex surface details. A clear acrylic display case or dust cover protects those intricate elements from accumulating debris.

The exposed suspension components and detailed brake assemblies attract dust quickly without protection. Regular dusting with a soft brush maintains the model’s sharp appearance, but prevention works better than constant cleaning.

Set Overview — The Numbers

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What Makes the 42115 Special

The Sián sits in LEGO’s flagship Technic vehicle lineage — alongside the 42056 Porsche 911 GT3 RS, 42083 Bugatti Chiron, and 42110 Land Rover Defender. Every set in that series is a sought-after build with strong collector demand.

Engineering under the bodywork

• V12 engine with moving pistons — pistons fire as you roll the model forward
• 8-speed sequential gearbox — shift through gears using a physical paddle behind the rear wheel arch
• Scissor doors — both open upward, exactly like the real Sián
• All-wheel drive system — front and rear axles connected through a functional drivetrain
• Deployable rear spoiler — operates mechanically via a lever at the rear
• Independent suspension — all four corners, front and rear
• Steering — operated from the steering wheel through the windscreen

The lime green and black colour scheme is unique to this set. The golden rims match the real Sián FKP 37 — a limited-run hybrid hypercar that Lamborghini produced in a run of just 63 units, all pre-sold before the car was even announced publicly.

Our take: The 42115 is the most visually striking Technic set LEGO has produced. It looks like a £2 million hypercar on a shelf, and the build itself is genuinely satisfying — the gearbox mechanism alone is worth the 10–12 hours it takes to complete.

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Current Market Price — March 2026

The Sián is still early in its post-retirement window. It only left shelves in late 2024, so prices haven’t moved as sharply as the Bugatti Chiron or Porsche GT3 RS did at the same stage. Sealed supply is finite and dropping — every box opened is one less available.

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How It Compares to Other Technic Flagships

The pattern is consistent. Every Technic flagship has become a collector favourite after retirement. The Porsche, Bugatti, and Defender are all regarded as some of the finest engineering LEGO has produced — and the Sián sits right alongside them. At 3,696 pieces with a functioning V12, 8-speed gearbox, and scissor doors, it’s the most mechanically ambitious of the lot.

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Why Sealed Matters

Sealed (factory sealed, all bags intact) guarantees completeness — every piece, sticker sheet, and instruction booklet untouched. If you ever decide to sell, a sealed box recovers your money. Opened boxes typically don’t.

At 3,696 pieces with a working V12 and 8-speed gearbox, you cannot afford to gamble on completeness. Missing a single Technic axle or gear mid-build is a genuine headache — and there’s no recourse once you’ve started. For a set this complex, sealed is the only sensible route.

If you’re buying to display or collect long-term, sealed is the only sensible option. The set retired recently and sealed supply is finite — every box opened is one less available.

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Where to Buy the LEGO Lamborghini Sián 42115 in the UK

LEGO.com, Argos, Smyths, John Lewis — none of them stock it. The Sián retired in late 2024. Your options are the secondary market:

• BuyMyBricks — £374.99, sealed, verified, tracked UK shipping. Every box checked before listing. No clones, no opened returns, no surprises. Lighting kit also available if you’re building for display.
• eBay UK — Widest range, £340–£420 sealed. Check seller feedback carefully (500+, 99%+), confirm condition is “New” not “New (Other)”, and read descriptions for damage keywords. Our eBay buying guide covers what to watch for →
• BrickLink — Specialist LEGO marketplace. Reliable sellers but EU shipping adds time and cost for UK buyers post-Brexit.
• Facebook Marketplace — Occasional private seller listings below market. Always use PayPal Goods & Services for buyer protection.

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More Retired Technic & Display Sets

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Frequently Asked Questions

Where can I buy a sealed LEGO Lamborghini Sian 42115 in the UK?

The 42115 is retired and no longer available from LEGO.com or any UK retailer. Sealed sets can be bought from specialist resellers like BuyMyBricks, eBay UK, or BrickLink. BuyMyBricks stocks verified sealed units at £374.99 with tracked UK delivery.

How much is the LEGO Lamborghini Sian 42115 worth?

As of March 2026, sealed sets sell for £350–£400 on the secondary market. BuyMyBricks stocks verified sealed units at £374.99 with tracked UK delivery.

Is the LEGO 42115 still available?

No. LEGO retired the Technic Lamborghini Sián FKP 37 in late 2024, after extending its shelf life by one year from the original 2023 exit date. It is no longer produced or stocked by any retailer.

Is the LEGO Lamborghini Sian a good build?

It’s one of the best Technic builds available. 3,696 pieces across a 1:8 scale model with a working V12, 8-speed gearbox, scissor doors, all-wheel drive, and deployable rear spoiler. Expect 10–12 hours of build time.

Is buying a sealed LEGO Lamborghini Sian 42115 worth it?

At 3,696 pieces with a working V12 engine, 8-speed sequential gearbox, scissor doors, and all-wheel drive, the 42115 is one of the most complex Technic builds LEGO has produced. A sealed box guarantees every piece, sticker sheet, and instruction booklet is present and untouched — critical for a build this detailed. The display quality of the finished model rivals dedicated model kits costing far more.

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