These are all things you need to decide and specify before you ask for quotes.
If you just go out for 3 quotes to build 'townhouses' you will finish up with 3 differently specified quotes with varying quality which will be even harder to compare.
Just remember the cheapest quote may not be the best. I would pay quite a bit more than the cheapest to have a builder I was happy with.
See: http://www.anewhouse.com.au/2012/02/why-the-lowest-price-may-not-be-a-good-idea/ for more explanantion
