Entertaining space for teen-agers, I've learned, after long experience with four teen-agers of my own as well as with numerous teens of other harried parents, is a real necessity for peace in the family. Teen-agers are usually logical, if sometimes a bit unreasonable, in their demands.

In one home I recently worked on, the teen-age boy in the family had a super space - a renovated attic room with a sloped ceiling, an enlarged picture window and two small gabled alcoves into which were built bureau drawers and cupboards for storing clothes and treasures as well as a small television. Another alcove contained an ample shelf, of plastic laminate, for working, with many shelves above for books.

The floor space, totally carpeted> was thus kept entirely clear for sleeping and sitting. And the enterprising teen-ager who lived in this attic paradise chose to sleep right on the floor in a sleeping bag he could stuff away in a closet by day. He used many large, soft cushions for his sitting.

In another home I designed, a teen-age girl wanted a separate sitting room for guests. Her room, fortunately long and rather narrow, divided nicely.

I built a frame of 4-by-4's, in an up-side-down U-shape, to segregate the new parlor; I could only capture 6 feet by 10 feet (the width of the original room) leaving just enough space for the bed, a bureau and a night table. I then built the floor up by creating a 1-by-4 framed platform, covered with rough plywood sheathing, to give the space more visual separation.

In the alcove, I slanted the ceiling from the 4-by-4 to the top of the curved window, covering the rough framing with grooved plywood panels, and painted them white to look like the ceiling of an old veranda.

Just behind the 4-by-4 frame at the ceiling, hung a double traverse rod with clamp fixtures instead of drapery loops, available at any drapery shop. From this hung four 30-inch wide natural matchstick bamboo panels to cover the opening, or just to hang at the sides to filter the light.

Inside this new sitting space, I carpeted the entire floor and the riser with a shaggy off-white carpet. I used self-sticking carpet tiles to give it a soft look, different from the wood floor of the adjoining sleep-space.

Many soft pillows, a painted plywood "coffee-table" (just a plywood round on a 1-by-4 recessed square base), a mini-TV on a rolling cube also made of plywood, a hanging lamp and plants, completed the homey retreat for a resourceful teen-ager.