Useful sites for groups planning a building

Existing projects (though some are initiated/led by architectural firms rather than by the residents) Berlin example  ,  Co-housing special-interest retirement community “a virtual community that’s defining the future of a physical one” Group self-build in the UK , with local-council assistance; companies, UK self-build group company; gov’t a self-build association   ;   Mortgages   . ………….. Tips for self-builders,…