Sofas

A standard sofa seats three across one rigid frame, usually 72 to 96 inches wide, with no corner, no fold-out bed and no moving parts. That absence is the defining feature: everything else in this family adds something to this shape, and every addition costs money, weight or durability.

Under the fabric sit a frame, a spring layer and cushions, and each has a cheap version and a lasting one. Kiln-dried hardwood, meaning lumber baked to a low moisture content so joints stay tight, outlives softwood and particle board by decades. Springs arrive as sinuous wire, S-shaped steel runs clipped front to back, or as eight-way hand-tied coils, individual springs knotted to their neighbors in eight directions, which cost more and keep the seat from dipping in the middle. Cushion foam is rated by density, and 1.8 pounds per cubic foot is the floor for daily use, since lighter foam softens into a slump within two or three years.

All of its siblings are variations on this frame. A loveseat is the same build cut to two seats and 50 to 70 inches. A sectional turns the corner and commits an entire wall, where a plain sofa leaves both ends open for tables and lamps. Modular sofas split into units that fit any stairwell, at a higher price per seat. Sleeper sofas hide a mattress and pay for it in weight and stolen cushion depth, and reclining sofas add a mechanism that doubles what can break. Buy the plain three seat version when you want the most seat for the least money and nothing inside that wears out.

One long wall and two or more people at home is the case this piece serves. Households that nap on the sofa should confirm the interior length between the arms runs at least 72 inches, since a six foot adult cannot stretch out on less. Pass it by in a room under about 10 feet across, where a loveseat plus an armchair keeps the walkway open, and again if the stairwell turns tightly, because a one piece frame cannot be broken down.

Quality shows at the corners: grab an arm and rock it, because a frame that flexes on day one loosens into a creak by year three. Unzip a seat cushion and read the foam label rather than trusting the softness in the store. Rotate and flip loose cushions monthly so the wear spreads, vacuum the deck under them each season, and blot spills at once, since most upholstery stains set within an hour.