Are there any websites on model house building?

Question:Or any online books available.

Answers:
Is this for Interior Design or Architecture??

You should google it on Foam Core the material I used when I was in school for Interior Design.
http://www.evergreenscalemodels.com/...

Plastruct:

http://www.plastruct.com/

Online shops

http://www.towerhobbies.com/listings/cat...

http://www.walthers.com/

http://www.dhcinc.com/evergreen.htm...

http://www.hobbylinc.com/prods/r_pls.htm...

Best of luck!