Usually, in conducting a reliability analysis, researchers used cronbach's alpha. however, in my case of questionnaire design, my evaluation instrument must be used for on-site survey . which means, i will be the one to answer the questionnaire and not the people.i am tasked to measure every building..
Basing on your method conduct the questionnaire，especially for your needed data.
You could do the equivalent of a test-retest reliability by having another, independent observer do the same measurements on a subset of the buildings.
I'm not sure what you mean by "inter-observer" reliability. Content analysis uses something called "inter-rater" reliability, but that usually applies to coding qualitative data.
What I had in mind was two separate observers independently calculating the square footage, and then correlating those two measures to get an estimate of reliability.
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