The sign for "house" uses "flat hands" to show the roof and walls of a house.
 

HOUSE:

Hand shape:
The hand shape can be either "B" handshapes or just "flat" hands.

 

There are a couple of different ways to do the sign "house." 

You might see house signed with the fingers pointed upward. I wouldn't sign it that way for everyday conversation but this version could be used for times when you want to embellish your signing a bit to make it more iconic and lively. For example, I might use this version if I were telling a story to a group of children about a certain "house." 

HOUSE (version)

 

For everyday use though, I tend to do the sign house with the fingertips pointing forward instead of up.

HOUSE (recommended version)

Notes:
House and home are two different signs. You should not use the sign "house" when you mean home.

See:  HOME

Also see CITY