Lego® Harry Potter™ 76420 Triwizard Tournament: The Black Lake

Current best price

LEGO 76420 is currently available from £45.88 incl. shipping at eBay. Only one retailer in our comparison stocks it.

Updated 2 November 2026 at 15:34

LEGO® Harry Potter™ Triwizard Tournament: The Black Lake 76420 (1/3)
LEGO® Harry Potter™ Triwizard Tournament: The Black Lake 76420 (1/3)
LEGO® Harry Potter™ Triwizard Tournament: The Black Lake 76420 (2/3)
LEGO® Harry Potter™ Triwizard Tournament: The Black Lake 76420 (3/3)

Lego 76420 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 Triwizard Tournament: The Black Lake with the set number 76420 is part of the LEGO Harry Potter™ theme and is recommended for ages 8+. It was released in March 2023. It includes 5 minifigures. The model has 349 pieces, and we estimate it takes around < 1 hour to build. It was designed by George Gilliatt.467 Brickfact users have this set in their collection.
The set weighs about 0.554 kg. The box measures 10.3 x 11.1 x 2.3 in (26.2 x 28.2 x 5.9 cm). The recommended retail price is £39.99.
Our Brickfact Lego price comparison compares the prices of 1 shop for this set. It is currently cheapest at eBay for £45.88 including shipping. That is £0.13 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 £46.50. You save around £0.62 if you buy the complete set at eBay instead of the individual parts on bricklink.com. The current best offer therefore has a POV rate of 1.01: the Part-Out-Value divided by the current best price on Brickfact.

Lego 76420 product data

Set Information

Set ID
76420
Pieces
349
Designer
George Gilliatt
Building Time
< 1 hour
Age Range
8+
Minifigures
5

Availability

Release
03/2023
Retiring Status
Retired (12/2024)

Price Information

RRP
£39.99
Insiders Points (for purchase at Lego)
320
Part Out Value
£46.50
i

Packaging

Weight
0.554 kg
Packaging dimensions
10.3 x 11.1 x 2.3 in
EAN (GTIN13)
5702017413235

Popularity with Brickfact users

users have this set
467
buyers in the last 12 months
40

467 Brickfact users have Triwizard Tournament: The Black Lake in their collection. 40 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 2 November 2026.

Lego 76420 price trend

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

Current market value
£33.58
Growth vs. RRP
−16.0 % £39.99
Range
£24.94 – £34.59
Average
£29.05

Loading price history…

Lego 76420 price history: how has the price changed?

Brickfact has been recording retailer prices since 23/10/2026. Best price so far: £48.33 (11 days ago).

Current best price
£45.88 +15% vs. RRP
Best price since 23/10/2026
£48.33 +21% vs. RRP · 11 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£45.88£48.3302/11/26

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.

Minifigures from 76420 Triwizard Tournament: The Black Lake

The Triwizard Tournament: The Black Lake set includes 5 different minifigures, 5 of which are unique to this set. The combined value of the minifigures is £15.42, which is ~39% of the RRP of this set.
x1
Thumbnail of minifigure hp413
Harry Potter
Harry Potter
time-logo
2023
#hp413
£2.27
i
Unique
x1
Thumbnail of minifigure hp414
Viktor Krum
Harry Potter
time-logo
2023
#hp414
£3.81
Unique
x1
Thumbnail of minifigure hp415
Hermione Granger
Harry Potter
time-logo
2023
#hp415
£1.75
Unique
x1
Thumbnail of minifigure hp416
Ron Weasley
Harry Potter
time-logo
2023
#hp416
£1.59
Unique
x1
Thumbnail of minifigure hp417
Merperson
Harry Potter
time-logo
2023
#hp417
£6.01
Unique

Official Set Description for LEGO 76420 Triwizard Tournament: The Black Lake

Kids can stage a spellbinding contest with the LEGO® Harry Potter™ Triwizard Tournament™: The Black Lake (76420) playset. A top gift idea for kids aged 8 and up, it features a buildable underwater scene with an arch ruin, 2 caves and flexible LEGO elements to create the effect of 2 minifigures floating. There is also a pier model, with a minifigure-diving function, which can be placed on top of the underwater scene.

Iconic characters
Bring a classic Harry Potter and the Goblet of Fire™ scene to life with 5 LEGO minifigures, including Harry Potter with flipper elements and Viktor Krum with a shark head element to help them rescue Hermione Granger™ and Ron Weasley™. Fans will also be inspired to play by the Merperson minifigure, new-for-March-2023 Grindylow figure and accessory elements such as the Gillyweed potion.

App-assisted building
Let the LEGO Builder app guide your youngster on a building adventure where they can zoom in and rotate models in 3D, save sets and track theirprogress.

  • Stage a magical contest – Kids can play out Triwizard Tournament™ tasks at the Black Lake from Harry Potter and the Goblet of Fire™ with this LEGO® Harry Potter™ building set (76420) for ages 8 and up
  • 5 LEGO® minifigures and 2 LEGO figures – Harry Potter™ with flipper elements, Viktor Krum with a shark head element, Hermione Granger™, Ron Weasley™ and a Merperson, plus Grindylow and crab figures
  • Black Lake underwater scene – Features a buildable arch ruin with 2 flexible LEGO® elements to create the effect of Hermione Granger™ and Ron Weasley™ floating, plus 2 caves with hidden treasure
  • Buildable pier model and rowboat – The pier features a minifigure-diving function and a rotating clock, plus accessory elements inside including a kettle and Gillyweed potion
  • Gift idea – Give this 349-piece buildable LEGO® Harry Potter™ playset as a surprise reward, birthday present or holiday gift to kids who are into Harry Potter and the Wizarding World
  • Build, play and display – The pier model measures over 7 in. (18 cm) high, 5 in. (12 cm) wide and 2.5 in. (6 cm) deep and can be placed on top of the underwater scene
  • A helping hand – The LEGO® Builder app guides your youngster on an intuitive building adventure with tools that let them zoom in and rotate models in 3D, save sets and track their progress
  • Part of an extensive assortment – LEGO® Harry Potter™ toy building sets let young wizards, witches and Muggles™ role-play iconic scenes, make up their own adventures orsimply display the models
  • High quality – Since 1958, LEGO® components have complied with stringent industry quality standards to ensure they connect consistently and securely
  • Safety first – LEGO® bricks and pieces are tested in almost every way imaginable to make sure they comply with rigorous global safety standards

Building Instruction for LEGO 76420 Triwizard Tournament: The Black Lake

LEGO 76420 Frequently Asked Questions

How much does LEGO 76420 Triwizard Tournament: The Black Lake cost?
The lowest price in the Brickfact price comparison is currently £45.88 incl. shipping at eBay. The RRP is £39.99.
Where can I buy LEGO 76420 cheapest?
Only one retailer in the Brickfact price comparison currently stocks LEGO 76420: eBay (£45.88).
Is LEGO 76420 still available?
LEGO has retired 76420 Triwizard Tournament: The Black Lake. New copies are still available at 1 retailers in our price comparison while stocks last.
What is the recommended age for the LEGO Harry Potter Triwizard Tournament: The Black Lake (76420) playset?
The recommended age for the LEGO Harry Potter Triwizard Tournament: The Black Lake (76420) playset is 8 years old and up.
How many LEGO minifigures are included in the set?
The set includes 5 LEGO minifigures, specifically Harry Potter with flipper elements, Viktor Krum with a shark head element, Hermione Granger, Ron Weasley, and a Merperson.
What is the size of the pier model included in the playset?
The pier model measures over 7 inches (18 cm) in height, 5 inches (12 cm) in width, and 2.5 inches (6 cm) in depth.
Is there an app-assisted building feature for this LEGO set?
Yes, the LEGO Builder app can guide your youngster on a building adventure, allowing them to zoom in and rotate models in 3D, save sets, and track their progress.
When was LEGO 76420 cheapest?
Since tracking began on 23/10/2026, the lowest shop price recorded by Brickfact for LEGO 76420 was £48.33 on 23/10/2026 at eBay, including shipping. Amazon prices are not included.

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