...and build houses? any website for girls where u can have fun!

There are a few i like. some are city builders, and some are doll creators.
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millsberry.com
city creator (does not allow accounts)
zanpo.com (is for girls and boys)
elouai city creator (does not have accounts)
dress up games (gives resouces for many websites)

hmm.... millsberry.com you can buy and put furniture in your house but not really build the house, for boys and girls, i dunno. that is all i can think of for now,

http://mysims.ea.com/minigames.php you can decorate a house, i just found it. and you do not need to sign up.