These Lego-style classrooms were built in a few weeks with only a screwdriver

It's hard to grow a school without adding more space for students.

It's a problem that Alfred de Vigny and Rollinat— two private high schools in Indre-et-Loire, France — ran into when they wanted to expand their admissions capacity. The schools needed more classrooms, but the cost and time needed to expand the existing buildings was more than they could afford.

The schools instead decided to build two PopUp Houses, customizable structures made from stackable blocks (kind of like Legos), to serve as satellite classroom buildings. Designed by the French architecture firms Multipod Studio and Arc A3 Sud Touraine, the PopUp buildings each took about two weeks to construct. The whole process of designing, ordering, and building happened in four months total, with the second building complete in December 2016.

Check out photos below.

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The PopUp building for Rollinat High School measures 1,614 square feet and includes two connected classrooms. The building for Alfred de Vigny has three classrooms and is 2,422 square feet.

Here's an aerial view of Rollinat High School. The satellite PopUp classroom building sits in one of its parking lots.

The construction process is a lot like building with Legos. The buildings are made from stacked recyclable wooden panels and insulation blocks, all held together with wood screws, Multi-pod Studio co-founder Corentin Thiercelin tells Business Insider.

Anyone can order a PopUp House online. They cost between $1,200 and $1,900 per square meter, depending on the quality of the materials and amenities. Once a home is ordered, Multi-pod Studio sends along building instructions (an additional $1,640 fee) and a construction team.

The teams would not disclose how much each classroom building cost.