A waste of time. House requirements change all the time. So you want to set a design in stone, so to speak, instead of allowing the design to change over the years with changing requirements.<p>Look at the buildings (not just 'houses') that have lasted more than a few centuries. You will find that they are filled with kludges to offset the requirements of change over that time: like cables attached to the outside of stone walls instead of being embedded and hidden away as they normally are; or double-glazing retrofitted to small-pane windows; or foam sealant being applied to drafty gaps in walls; or false ceilings to reduce the ceiling height to reduce heating costs, etc, etc.<p>And many buildings are demolished not because they are no longer suitable, but because the location where they are is wanted for something else. So in that case, it wouldn't matter that the house is designed for 1000 years, it's just not wanted there anyway.