A basic hangar is essentially a means of securing your machine against the elements/unwanted visitors and, as previous posters have pointed out, can be reasonably cheaply achieved. Consequently, make the following your primary considerations: what do I actually need/want and what will the authorities (airport mgmt, flying club, local council etc) allow/require? A 6m X 12m basic steel shed having sliding door access across one end and with 2nd-hand carpet on a compacted earth floor can be quite an economical and effective hangar if you are prepared to be a bit unorthodox and park your two-seater on a suitable pneumatic-tyred dolly and house it sideways in the shed. From that lowest cost starting point (viz no 12m 'clear span' trusses required) you can go as far towards the other end of the spectrum (full living quarters, airconditioned workshop etc) as your imagination, your wife and your bank manager will allow. Happy hunting.
Cheers Riley