42121Heavy-Duty Excavator
- 2021released
- 569pieces
- Technictheme
Typical new & sealed
£64.57
from £42.30 · 11.3p/piece
Typical used & complete
£39.61
from £31.26 · 7.0p/piece
· 27% below typical
View on eBay →
Updated 2h ago · 39 listings found
Price history
eBay UK · median Buy It Now asking price
We started tracking this set on 18 Oct 2026. The chart fills in as we record prices each day.
38 listings
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LEGO Technic 42121 Heavy-Duty Excavator 569pcs 8+ Box 2021 38cm UK
Used · not stated
djcol2011 · 100% · 882 feedback£23.22 incl. £2.26 postage 4.1p/piece 27% below typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) Used - Great condition UK
Used · not stated
nickakehurst · 100% · 347 feedback£23.76 incl. £2.26 postage 4.2p/piece 26% below typical -
£26.39 free postage 4.6p/piece 17% below typical -
LEGO Technic 42121 Excavator Set With Instructions UK
Used · not stated
📘 Instructions bluebellesales · 100% · 271 feedback£28.95 incl. £2.26 postage 5.1p/piece 9% below typical -
LEGO Technic 42121 Excavator Set With Instructions UK
Used · not stated
📘 Instructions imperrettive · 100% · 158 feedback£28.96 incl. £2.26 postage 5.1p/piece 9% below typical -
LEGO Technic 42121 Heavy-Duty Excavator Complete with box and instructions UK
Used · complete
📦 Box 📘 Instructions lebutt-41 · 99.7% · 593 feedback£31.26 incl. £2.26 postage 5.5p/piece 21% below typical -
LEGO Technic Heavy-Duty Excavator 42121 Set 569 Pieces Age 8+ With Box UK
Used · not stated
📦 Box dj-mastercato2716 · 100% · 54 feedback£31.45 incl. £2.46 postage 5.5p/piece About typical -
LEGO TECHNIC Heavy Duty Excavator Set 42121 No Box UK
Used · not stated
No box davids4488 · 100% · 2,643 feedback£32.45 incl. £5.75 postage 5.7p/piece About typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) Used - Great condition UK
Used · not stated
rmk15as · 100% · 135 feedback£34.62 incl. £2.62 postage 6.1p/piece 8% above typical -
£36.25 incl. £2.26 postage 6.4p/piece 13% above typical -
LEGO Technic 42121 Heavy-Duty Excavator Set 100% Complete + extra bricks & cones UK
Used · complete
danjenkins81 · 100% · 220 feedback£39.25 incl. £2.26 postage 6.9p/piece About typical -
LEGO Technic 42121 Heavy-Duty Excavator 2 in 1 Building Set Age 8+ UK
Used · not stated
chrispow-78 · 100% · 145 feedback£39.36 incl. £2.26 postage 6.9p/piece 23% above typical -
BOXED LEGO TECHNIC HEAVY DUTY EXCAVATOR 42121 MODEL CONSTRUCTION 2 in 1 SET UK
Used · not stated
📦 Box stripytiger · 100% · 15,786 feedback£39.49 incl. £4.50 postage 6.9p/piece 24% above typical -
LEGO Technic 42121 Heavy-Duty Excavator 2-in-1 Set Used With Box Complete UK
Used · complete
📦 Box sunny_by_design · 100% · 880 feedback£39.97 incl. £4.98 postage 7.0p/piece About typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions ahancox86 · 100% · 63 feedback£42.30 postage not shown 7.4p/piece 34% below typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) - New and Sealed UK
New & sealed
📦 Box 📘 Instructions w.k12 · 100% · 97 feedback£44.56 incl. £2.26 postage 7.8p/piece 31% below typical -
LEGO Technic 42121 Excavator PLEASE TAKE A LOOK AT MY OTHER ITEMS? UK
New & sealed
📦 Box 📘 Instructions ⏱ 5d 9h · 0 bids damoh81_123 · 100% · 288 feedback£45.24 incl. £2.94 postage 8.0p/piece Current bid -
Lego 42121 - Heavy Duty Excavator - Technic UK
New & sealed
📦 Box 📘 Instructions dantlol · 98.3% · 296 feedback£50.88 incl. £3.38 postage 8.9p/piece 21% below typical -
LEGO Technic 42121 Heavy-Duty Excavator 2-in-1 569pcs Age 8+ Box UK
Used · not stated
⏱ 6d 8h · 0 bids hethom-46 · 100% · 215 feedback£52.71 incl. £5.21 postage 9.3p/piece Current bid -
LEGO TECHNIC: Heavy-Duty Excavator (42121) complete with box and instructions UK
Used · complete
📦 Box 📘 Instructions catherineetaylor · 100% · 76 feedback£55.05 incl. £12.75 postage 9.7p/piece 39% above typical -
LEGO Technic Heavy-Duty Excavator 42121 2-in-1 Set 569 Pieces (Boxed) UK
New & sealed
📦 Box 📘 Instructions ddaw100 · 100% · 626 feedback£55.63 incl. £2.94 postage 9.8p/piece 14% below typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions high1976 · 100% · 2,841 feedback£59.99 free postage 10.5p/piece 7% below typical -
LEGO Technic 42121 Heavy-Duty Excavator UK
New & sealed
📦 Box 📘 Instructions chehar-150530 · 100% · 59 feedback£60.88 incl. £3.38 postage 10.7p/piece 6% below typical -
LEGO Technic 42121 Heavy-Duty Excavator Set Sealed Box UK
New & sealed
📦 Box 📘 Instructions januvaid · 100% · 1,007 feedback£61.28 incl. £3.38 postage 10.8p/piece 5% below typical -
LEGO Technic 42121 Heavy-Duty Excavator Building Kit with Box and Instructions UK
New & sealed
📦 Box 📘 Instructions januvaid · 100% · 1,007 feedback£61.61 incl. £3.71 postage 10.8p/piece 5% below typical -
* LEGO Technic 42121 Heavy-Duty Excavator 2-in-1 Set BRAND NEW FACTORY SEALED * UK
New & sealed
📦 Box 📘 Instructions vintage-antique-designer-emporium · 100% · 352 feedback£62.93 incl. £2.94 postage 11.1p/piece About typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions lego_direct · 99.6% · 327 feedback£63.10 free postage 11.1p/piece About typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions mclynuk · 100% · 10 feedback£66.04 incl. £2.94 postage 11.6p/piece About typical -
£66.48 incl. £3.38 postage 11.7p/piece 108% above typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions kaldpop · 100% · 288 feedback£76.16 incl. £3.71 postage 13.4p/piece 18% above typical -
LEGO TECHNIC Heavy-Duty Excavator 42121 - Brand new in Sealed Box - 2 in 1 model UK
New & sealed
📦 Box 📘 Instructions giant_spider · 100% · 135 feedback£80.01 free postage 14.1p/piece 24% above typical -
LEGO 42121 Technic: Heavy-Duty Excavator Digger - Brand New & Sealed RETIRED UK
New & sealed
📦 Box 📘 Instructions leadhead35 · 100% · 1,272 feedback£83.85 free postage 14.7p/piece 30% above typical -
LEGO Technic 42121 Heavy-Duty Excavator 2 in 1 Set - New and Unopened UK
New & sealed
📦 Box 📘 Instructions elsa2266 · 99.8% · 9,675 feedback£85.00 free postage 14.9p/piece 32% above typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions chyue0 · 98.4% · 471 feedback£92.99 incl. £3.89 postage 16.3p/piece 44% above typical -
Lego Technic 42121 Heavy Duty Excavator - Brand New & Sealed - Retired Model UK
New & sealed
📦 Box 📘 Instructions coolmama13 · 100% · 76 feedback£97.67 incl. £3.38 postage 17.2p/piece 51% above typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions keblac7 · 100% · 271 feedback£108 incl. £3.89 postage 18.9p/piece 67% above typical
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LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions stefanvlad · 100% · 62 feedback£109 incl. £4.27 postage 19.2p/piece 69% above typical -
LEGO TECHNIC: Heavy-Duty Excavator (42121) UK
New & sealed
📦 Box 📘 Instructions yrb2g47 · 100% · 1 feedback · ⚠ check carefully£170 incl. £10.00 postage 29.9p/piece 163% above typical
Only seeing UK listings. Compare all 5 countries →
Before you buy 42121
- “Complete” should mean all 569 pieces. Ask the seller whether they checked against the inventory or just think it's complete.
- Sealed means factory seals intact. Ask for photos of the seals and box corners; box condition moves the price a lot on retired sets.
- Check the seller's feedback. For a retired set, stick to sellers with 98%+ feedback and a history of selling LEGO.
- Watch out for knock-offs. Brands like Lepin and Mould King copy popular sets. Look for the LEGO logo on the box and bricks.
- Pay through eBay. eBay's Money Back Guarantee covers items that don't match the description, but only if you pay through eBay.
Questions
How much is LEGO 42121 Heavy-Duty Excavator worth?
Based on current eBay UK Buy It Now listings, a new sealed set typically costs £64.57 and a complete used set about £39.61, including postage. These are asking prices, so a set can sell for less.
How many pieces are in LEGO 42121?
Heavy-Duty Excavator has 569 pieces. It was released in 2021.
What is the price per piece of 42121?
At the typical sealed price of £64.57 it works out at 11.3p per piece.
