House consists of 2 modules that simply stack on top of one another. Overall dimensions are 21"x21"x40"H on the outside and inside each module measures aprox. 16"x16"x12"H. House is completely insulated and has carpet on all interior surfaces. The door openig measures 6 1/2" x 7 1/2"H and has a vinyl flap. The roof module has a round plexi-glass window. To make this a larger house simply order an extra module or two. 2-STORY MODULAR KITTY HOUSE 2lvmod$299.00Choose 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. ADD HEATThis is thermostat controlled heat with an infared bulb. You also get an access door on the top module to adjust the thermostat and monitor the temperature. Please note that the heat is installed in the top. ADD HEAT modheat$99.00 NEW DELUXE HEAT MODULEThis heat option is a big improvement over the one listed above. It installs between the first and second levels. It heats the module below it with a 100 watt infared bulb. The top of the module is also a heated bed, since warm air rises heat is evenly distributed throughout the house. The carpet on the heated bed is easily removed for cleaning or replacement. NEW DELUXE HEAT MODULE HTMOD$199.00Choose siding color: Barn RedWhiteIvoryLt. BlueLt. GreenDark GreenGolden OakDark WalnutYellowBrownTealnone-naturalnone-Cedar Wood Choose Trim Color: Dark GreenRedWhiteIvoryDark WalnutLt. BlueYellowTealBrownLt. Greennone-naturalnone-Cedar Wood MAKE IT CEDARTHIS OPTION IS FOR THE 2-STORY MODULAR HOUSE ONLY. Make it cedar and you will never have to repaint the house. The siding and the trim are Cedar. PLEASE NOTE YOU DO NOT CHOOSE COLORS FOR A CEDAR HOUSE, WE FINISH IT WITH A CLEAR SEALER TO BRING OUT THE BEAUTY OF THE WOOD. ALSO THE 2-STORY MODULAR STARTS OUT AT $299 AND THEN IT'S $89 EXTRA TO MAKE IT CEDAR. MAKE IT CEDAR cdrmod$89.00 ADD A WINDOW ADD A WINDOW ADDWIN$17.50STYLE: SQUAREROUNDPAW PRINT 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 cdlin$59.00 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.