Modulex bricks

Modulex A/S was founded in Denmark in 1963 by the Lego Group and the association is maintained to this day. Located in over 35 countries, and with 40 locations in the US alone as a result of a merger with ASI in 1993.

Modulex history

Modulex lego

In the 1960s, the designer of the modern Lego brick Godtfred Kirk Christiansen was building a new house and, naturally, he tried to model the structure with Lego bricks. The problem was that the Lego brick, with an aspect ratio of 6:5, was different than standard European construction modules of 1:1. Rather than contend with the problems of using regular Lego bricks he simply had new, special bricks molded for him. Bricks that would allow him to more closely copy his architectural plans.

Modulex bricks are smaller 'cousins' of LEGO bricks. They were originally developed by the LEGO company and marketed to professional architecture firms and such (not as a retail toy).

Possibly to the surprise of many LEGO collectors, these bricks are still manufactured today (by the now independent, but LEGO-related, company Modulex).

Modulex bricks are not compatible with typical LEGO bricks. The standard 1x1 Modulex brick (or 'component' as the company refers to them) is 5mm cubed (yes, they are perfect cubes, unlike LEGO unit bricks which are taller than they are wide or deep).

Read more about Modulex history (PDF 1,6mb.)

Updated: 9 December 2019

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Modulex value and price guide

What's your Modulex worth in 2021? Here are some recently sold items.

Item Title Date Price
lego modulex m20 two boxes rare Lego Modulex M20 Two Boxes Rare 09/2021 $99.00
lego classic system modulex architecture 60 s 70er 60er Lego Classic System Modulex Architecture 60 S 70er 60er 07/2021 $60.49
lego classic system modulex architecture 60 s 70er 60er Lego Classic System Modulex Architecture 60 S 70er 60er 07/2021 $30.25
architect lego modulex m20 industrial design set case Architect Lego Modulex M20 Industrial Design Set Case 06/2021 $1 850.00
4 pcs lego modulex 16x1 1x16 white plate architecture 4 Pcs Lego Modulex 16x1 1x16 White Plate Architecture 06/2021 $9.99
no pictureSee all sold items on eBay for more prices10/2021$-.--

Modulex forum

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Comments (2)
Bob - November 17, 2020
Hi, I have inherited a lot of Lego M20
The receipt we have shows the date as 1966.
I cannot find anything similar on the internet. Most of the boxes are unopened and all seem to be No 2141
Would be able to say how much this worth.
Many Thanks
Bob Simpson.
Sorry, I could only find this Danish page, hope it helps a bit: Modulex M20.
Claus - December 8, 2019
I have two gray plates on 1×1 meter with a plexiglass cover. What are they worth?
Not sure, you can have a look here to see if you can find yours or similar ones: Modulex plates.