70437Mystery Castle
- 2020released
- 1,035pieces
- 6minifigures
- Hidden Sidetheme
Typical new & sealed
£180
from £122 · 17.3p/piece
Typical used & complete
–
from £73.51 · too few listings
View on eBay →
Updated 3h ago · 11 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.
11 listings
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LEGO HIDDEN SIDE: Mystery Castle (70437) Complete Set with box and instructions UK
Used · complete
📦 Box 📘 Instructions macdal17 · 100% · 396 feedback£73.51 incl. £5.21 postage 7.1p/piece Not enough data -
LEGO Hidden Side 70437 Mystery Castle Set With Instructions UK
Used · not stated
📘 Instructions william.bryce · 99.9% · 1,897 feedback£78.21 incl. £5.21 postage 7.6p/piece Not enough data -
£99.86 incl. £7.64 postage 9.6p/piece Not enough data -
LEGO Hidden Side Mystery Castle (70437) 1035pcs App-Enabled Boxed 9+ Retired UK
New & sealed
📦 Box 📘 Instructions ketzcards · 100% · 606 feedback£122 incl. £6.76 postage 11.8p/piece 32% below typical -
LEGO Hidden Side 70437 Mystery Castle (NEW sealed bags but opened box) UK
New & sealed
📦 Box 📘 Instructions bric.king · 100% · 290 feedback£136 free postage 13.1p/piece 24% below typical -
Lego Hidden Side 70437 - Mystery Castle - Brand new and sealed UK
New & sealed
📦 Box 📘 Instructions snowwraith · 100% · 990 feedback£170 free postage 16.4p/piece 5% below typical -
LEGO HIDDEN SIDE: Excellent Mystery Castle 70437 ** NEW sealed ** UK
New & sealed
📦 Box 📘 Instructions thebumble2010 · 100% · 1,667 feedback£175 incl. £6.70 postage 16.9p/piece About typical -
LEGO Hidden Side: Mystery Castle 70437 - Sealed UK
New & sealed
📦 Box 📘 Instructions pahun_2584 · 100% · 1,322 feedback£185 incl. £7.00 postage 17.8p/piece About typical -
LEGO HIDDEN SIDE: Mystery Castle (70437) UK
New & sealed
📦 Box 📘 Instructions scz4mc · 100% · 192 feedback£188 free postage 18.2p/piece 5% above typical -
Lego Hidden Side 70437 Mystery Castle UK
New & sealed
📦 Box 📘 Instructions petesmit158 · 100% · 233 feedback£189 incl. £5.80 postage 18.2p/piece 5% above typical -
LEGO HIDDEN SIDE: Mystery Castle (70437) UK
New & sealed
📦 Box 📘 Instructions ukzio · 100% · 869 feedback£195 incl. £7.00 postage 18.8p/piece 9% above typical
Only seeing UK listings. Compare all 5 countries →
Before you buy 70437
- Check all 6 minifigures are included. Minifigures are the first thing sold off from used sets, and often the most valuable part.
- “Complete” should mean all 1,035 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 70437 Mystery Castle worth?
Based on current eBay UK Buy It Now listings, a new sealed set typically costs £180, including postage. These are asking prices, so a set can sell for less.
How many pieces are in LEGO 70437?
Mystery Castle has 1,035 pieces and 6 minifigures. It was released in 2020.
What is the price per piece of 70437?
At the typical sealed price of £180 it works out at 17.3p per piece.
