Dollhouse windows and doors can be constructed from cardboard. According to Greenleaf Dollhouses, "Dollhouse scale" today is conventionally 1:12, which means that 2.5 cm (1 inch) in miniature means 30 cm (12 inches) in real life. This scale is also called 1:1 for "1 inch to 1 foot." Making easy cardboard windows and doors is a good way to finish a dollhouse inexpensively, or temporarily until you can afford to spring for more elaborate retail products.
Internal affixed window
Place the cardboard window rectangle on a table. Measure an internal rectangle, leaving a 1.2 cm (1/2 inch) border around the outer edge for the window frame. Mark in pen. Use a craft blade to cut out the internal rectangle.
Paint the window frame brown or desired colour. Allow paint to dry.
Glue, with school glue, the plastic rectangle to the frame back. Allow glue to dry. Clear plastic can be had for free by recycling plastic from toy packaging.
Glue, with school glue, the paper image of an outdoor scene, such as a garden, cut from a magazine, to the window back behind the plastic. The image should be visible through the window "glass."
Glue the window, with the glue gun, to the dollhouse wall, about 7,5 cm (3 inches) from the floor. For an external window, follow Steps 1 to 4, replacing the outdoor scene with aluminium foil, then proceed to Step 5, gluing the window to an external wall.
Measure the door opening's width and height. Dollhouse doorways are usually at least 16.2 cm (6 1/2 inches) high. If your door dimensions are different, cut a rectangle to fit, otherwise use the 7.5 cm (3 inch) width by 15 cm (6 inch) length by 3 mm (1/8 inch) depth cardboard rectangle.
Paint the door rectangle brown or desired colour. Allow to dry. Turn the door over, and paint the other side and edges. Allow to dry.
Glue, with the glue gun, a gold bead 6 mm (1/4 inch) from the outside edge, and 7.5 cm (3 inches) from the bottom door edge, to the door. This is the doorknob.
Glue the other bead to the other side. According to Dollhouse Collectibles, "It is better to paint the door before it is glued with the opening of the dollhouse."
Position the door in the pre-cut space. Place a 3.7 cm (1 1/2 inch) length piece of electrical tape 2.5 cm (1 inch) down from the top door edge and 2.5 cm (1 inch) up from the bottom door edge onto the door. Tape the door into the doorway.
Use the same paint as on the door to paint the tape on the door's surface, and the same paint as is on the wall to paint the tape affixed to the wall.