Hi Michael,
I know what you mean with the "class room portables" but the finish on these is excellent. You realy wouldn't even know its a transportable now.
One of the main reasons was a time factor. I have been in construction a long time and didn't see much point in paying someone to oversea the whole process so I wanted to do it and save a bit of money. I work 60 days on and 30 off so it was built while I was away and I was able to organise all the foundation work, steel columns, plumbing, electrical etc and put it on on my return.
Price.....135k for the 3 modules... 3 bedroom, 2 bathroom all fitted out with lights,kitchen,carpets,showers etc. We had to install heat pump, blinds and fit out wardrobe with shelves and doors. Transport and crane costs were also our responsibility.
Basic infrastructure costs have yet to be tallied but looking at overall cost of 180k when finished. Hope to get a valuation done soon and will let you know. Looking for rental return of 300pw and since we bought the land nearly 20 yrs ago it will be cf+.
Compared to traditional styles of building I would think it would be a bit cheaper. The quotes I had started around 202k for brick but we all know theres always extras on top. I am still supprised actually just how good it looks and will post a few more pics when I get a chance.