Here's another U.S. Department of Energy Solar Decathlon contestant building with prefab components.

The house will be on display next month at the National Mall in Washington, DC.

According to the Lumenhaus site:

The modular design means the whole house itself is also flexible. Multiple units can be connected or stacked with plug-in stairs and entryways to create two-, three- or four- bedroom houses to adapt to the owners’ changing life circumstances.

Worth a look:

• a video (9:41) documenting the process

• Team Virginia Tech's blog

• a Team News page on the Solar Decathlon site which aggregates all of the team blogs into one channel

Interesting to note: Virginia Tech is the only U.S. team to also compete in Solar Decathlon Europe in 2010.