Here is some links to sites that have great building tutorials.Mike InsideSims 2 Wiki
youtube is also a great place to see how houses are built. Here is just a few examples they have to offer..... http://www.youtube.com/watch?v=9fL4kwZ3K2Uhttp://www.youtube.com/watch?v=48NRBgW0Ms8&feature=related
Use search to find more. :)
The Sims 2 Wiki
is mostly the same as the MTS2 (possibly because they're run by the same people) but it has a few more tutorials and it's much more organized.
Thank you very much J :hug2