This video shows 15 or so low tech, mostly DIY hidden rooms and compartments that could come in handy.
diy home building
Shelter Institute Workshops, Books and Tools
“Shelter Institute classes will empower you. For over 35 years, we’ve been teaching people how to build, renovate, general contract, or simply how to live better in their homes. We take a common-sense approach toward teaching and building. You’ll learn by experience. We integrate timeless tools and traditional techniques with cutting-edge knowledge and technology. At … Read more