Module measures aprox. 21"x21"x20h" on the outside and 16"x16"x12"h on the inside. It has a perch that kitty can jump up on to enter the higher levels from the outside but also has openings on the inside to move from one level to another. A 3-story house measures 60"h and a 4-story house measures 80"h. EXTRA MODULE addmod$189.00Choose siding color: Barn RedWhiteIvoryLt. BlueGreenDark GreenGolden OakDark WalnutYellowBrownTealGraynone Choose Trim Color: Dark GreenRedWhiteIvoryDark WalnutLt. BlueYellowTealBrownGreenGraynone DOOR UPGRADESMost of the houses come with the standard door (wood frame & vinyl flap) or you can upgrade to a plastic commercial door. MAKE IT CEDARMake it cedar and you will never have to repaint the house. MAKE IT CEDAR cdrexmod$39.00 CEDAR LININGReplaces the carpet on the interior walls with Cedar. It's easier to maintain and is a natural bug and flea repellant. CEDAR LINING cdlin2$29.00 ADD A WINDOW ADD A WINDOW ADDWIN$17.50STYLE: SQUAREROUNDPAW PRINT Please note that some of the houses pictured through out this sight have various upgrades and add-ons,most of the houses do not come with a window unless you add it and the standard door is made of wood with a vinyl flap.Unless stated otherwise in the description. PLEASE READ ALL INFO ON THE HOUSES THOROUGHLY BEFORE PLACING YOUR ORDER. MOST PROBLEMS ARE CAUSED FROM PEOPLE WHO HURRY THRU THE STORE AND THEN MAKE UNINFORMED ORDERS. AT THIS TIME, CUSTOM HOUSES ARE SHIPPING OUT WITHIN 10 BUSINESS DAYS. NEED IT QUICK? CHECK OUT OUR READY TO SHIP HOUSES.