Strata Building Website

I an the chairman of an executive committee and we want to establish a website for our building.  Ours is a mid-range block of 80 apartments with a part-time building manager only, so we’d also like the website to self administer most of the routine situations where residents need to apply or register e.g. bicycle & pet registrations, building works applications & lift protection install for moving in/out etc.  We envisage a resident having to click on check boxes agreeing to their particular situations criteria and enter details in certain fields before the system would generate an “approved” or “pending approval” notice.  

Can anyone please tell me if this type of website/software already exists or would it be an expensive custom built proposition?