Lego® Technic 42121 Heavy Duty Excavator

Current best price

LEGO 42121 is currently available from £85.00 incl. shipping at eBay. Only one retailer in our comparison stocks it.

Updated 26 October 2026 at 09:52

Lego 42121 price comparison: where is it cheapest?

Prices incl. shipping to the UK ·

Brickfact may earn a commission when you buy through a merchant link. Commissions do not determine the order of offers. How Brickfact compares prices

iFurther information
The Lego set Heavy Duty Excavator with the set number 42121 is part of the LEGO Technic theme and is recommended for ages 8+. It was released in March 2021. The model has 569 pieces, and we estimate it takes around 1 - 2 hours to build. 235 Brickfact users have this set in their collection.
The set weighs about 0.644 kg. The box measures 11.1 x 10.3 x 3 in (28.2 x 26.2 x 7.6 cm). The recommended retail price is £34.99.
Our Brickfact Lego price comparison compares the prices of 1 shop for this set. It is currently cheapest at eBay for £85.00 including shipping. That is £0.15 per piece. Unfortunately, the set is currently not available below its recommended retail price.
The Part-Out-Value (POV) is the sum of the average prices paid on bricklink.com for all parts of this set. It is about £42.55.

Lego 42121 product data

Set Information

Set ID
42121
Theme
Pieces
569
Building Time
1 - 2 hours
Age Range
8+

Availability

Release
03/2021
Retiring Status
Retired (12/2022)

Price Information

RRP
£34.99
Insiders Points (for purchase at Lego)
280
Part Out Value
£42.55
i

Packaging

Weight
0.644 kg
Packaging dimensions
11.1 x 10.3 x 3 in
EAN (GTIN13)
5702016890976

Popularity with Brickfact users

users have this set
235
buyers in the last 12 months
15

235 Brickfact users have Heavy Duty Excavator in their collection. 15 users bought it in the last 12 months.

Based on anonymized Brickfact user collections; shown only for sets with at least 10 users. As of 26 October 2026.

Lego 42121 price trend

Average sale price on secondary marketplaces – not the new price at retailers.

Current market value
£54.68
Growth vs. RRP
+56.3 % £34.99
Range
£50.10 – £69.60
Average
£55.64

Loading price history…

Lego 42121 price history: how has the price changed?

Brickfact has been recording retailer prices since 23/10/2026. Best price so far: £85.00 (3 days ago).

Current best price
£85.00 +143% vs. RRP
Best price since 23/10/2026
£85.00 +143% vs. RRP · 3 days ago

Daily lowest prices at the tracked shops, including shipping. Gaps indicate days with no recorded price. The table lists each shop’s lowest price.

Lowest price per retailer (since 23/10/2026)

RetailerCurrentLowest priceDate
eBay LogoeBay£85.00£85.0026/10/26

Lowest price per day that Brickfact recorded at the retailers in the price comparison, including shipping where known – as in the comparison above. Amazon offers are not included in the price history.

Official Set Description for LEGO 42121 Heavy Duty Excavator

Looking for a special gift for kids who love construction toy sets? This 2-in-1 LEGO® Technic™ Heavy-Duty Excavator (42121) toy has plenty of features for hours of creative play. Boys and girls aged 8 and up will enjoy an immersive building challenge before exploring the digger toy's realistic features.

See how an excavator works
Digging, driving, rotating; there's so much to discover in this cool kids' excavator toy. Check out the shovel that moves up and down, plus the movable arm, running belts and rotating body. There’s also a detailed cabin with a driver’s seat and control panel. The set comes with extra LEGO brick ‘stones’ to dig and 4 cones. When it’s time for a new challenge, the model rebuilds into a tracked tractor with backhoe.

A rewarding build for young LEGO fans
The LEGO Technic universe offers advanced building toys for LEGO fans ready for their next challenge. With realistic mechanisms, these rewarding sets are a great way to introduce kids to the world of engineering.

  • Whether it’s a birthday, Christmas, or ‘just because’ gift, young construction fans will love building and exploring this 2-in-1 LEGO® Technic™ Heavy-Duty Excavator (42121) toy set.
  • Packed with realistic features, this digger toy set lets kids see how construction vehicles really work. Check out the moving shovel and arm, plus running belts, just like on a real excavator.
  • When kids are ready for a new challenge, the 2-in-1 toy model rebuilds into a tracked tractor with backhoe.
  • This cool excavator toy for kids is ideal for boys and girls aged 8 and up who love construction vehicles.
  • With the authentic cabin and control panel to explore, it’s easy for kids to imagine life on a construction site with this cool excavator toy.
  • Role-play is easy with this cool set. There are 4 cones to manage the building site, plus extra LEGO® pieces to use as bricks for scooping up with the digger truck toy.
  • This kids' excavator toy model measures over 9 in. (23 cm) high, with arm up,14.5 in. (37 cm) long, with arm fully extended, and 4 in. (11 cm) wide.
  • The LEGO® Technic™ universe opens up the world of engineering for young LEGO fans ready for their next building challenge.
  • LEGO® components meet stringent industry standards to ensure they are consistent, compatible and connect reliably every time – it's been that way since 1958.
  • LEGO® components are dropped, heated, crushed, twisted and analyzed to make sure they meet strict global safety standards.

Building Instruction for LEGO 42121 Heavy Duty Excavator

LEGO 42121 Frequently Asked Questions

How much does LEGO 42121 Heavy Duty Excavator cost?
The lowest price in the Brickfact price comparison is currently £85.00 incl. shipping at eBay. The RRP is £34.99.
Where can I buy LEGO 42121 cheapest?
Only one retailer in the Brickfact price comparison currently stocks LEGO 42121: eBay (£85.00).
Is LEGO 42121 still available?
LEGO has retired 42121 Heavy Duty Excavator. New copies are still available at 1 retailers in our price comparison while stocks last.
When was LEGO 42121 cheapest?
Since tracking began on 23/10/2026, the lowest shop price recorded by Brickfact for LEGO 42121 was £85.00 on 23/10/2026 at eBay, including shipping. Amazon prices are not included.

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