One of the important modernist terms – flexibility – offers the introduction of time and of the unknown as parameters in design. Yet the development of flexibility in modern architecture shows also the ambivalent relationship between architecture and the user – the objective of incorporating flexibility in archi-tecture. The span between introducing the freedom of choice and expression and the reality of totally controlled spaces and movements shows the range of interpretations of this subject. By looking at the strategies and evolution of flexibility in architecture one can project possible problems and frictions for the new discipline – ubiquitous computing. Both flexible architecture and the ubiquitous house are devoted to space, time and technology, and intend to give the user the maximum of possibilities inside the house. What are the mistakes that some of the development in flexible architecture has made, that ubiquitous computing might learn from, especially in its relation to the user?