WINDOWS ARE MADE OF TREATED WOOD AND PLEXI-GLASS IF YOU NEED THE WINDOW ON A CERTAIN SIDE PLACE A NOTE IN THE COMMENT SECTION AT CHECKOUT. WHEN YOU STAND FACING THE HOUSE DO YOU WANT IT ON YOUR LEFT OR YOUR RIGHT? ADD A WINDOW WIN$19.00Choose Style: 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. DON'T WAIT FOR COLD WEATHER TO ORDER YOUR CAT HOUSE, CATS NEED PLENTY OF TIME TO GET USE TO THE IDEA OF USING A NEW HOUSE. ITEMS CAN NOT BE PICKUP UP MUST BE SHIPPED.