Seat depth, frame, fill: what to check before you sign for a sofa
Delivery routes, seat depth, frame construction and fabric ratings: the details that decide whether a couch is still worth sitting on in ten years.
A sofa is usually the most expensive piece of furniture in a house and the one that gets the least research, because of when it is bought. Somebody is moving in three weeks, or the old one has finally gone through at the front edge, and the decision happens after ninety seconds on each of four of them in a warehouse.
The mistakes are remarkably consistent, and almost all come down to something never measured or something inside the sofa nobody asked about.
Measuring the room and not the route
The sofa fits the wall. Whether it fits through the building is a separate question, and it is the one that produces the worst afternoons. Measure the narrowest point of the entire path: the front door, the tightest turn in the hall, the headroom at a stair landing, the diagonal inside an elevator. For most sofas the number that governs is the height of the end profile, because it travels on its side.
Then ask the store two things. Do the legs unbolt, and does the back come off — plenty of sofas are built with a removable back for exactly this reason, and it turns an impossible staircase into a normal delivery. Also read what happens if it will not go in. Some sellers refund; some charge a restocking fee plus two delivery legs, which is a lot to pay for furniture you never sat on at home.
Judging comfort in ninety seconds, in the wrong posture
Sit for ten minutes. Take out your phone and read something. Then sit the way you actually sit at home, which for most people is not the upright showroom pose but half-lying with feet up on one end.
Seat depth decides whether that works. Around 21 to 22 inches is a sitting-up seat: feet on the floor, back against the cushion, easy to leave. Past 24 inches is a lounging seat, and if you are not tall you will perch on the front edge or wedge pillows behind your back for a decade. Seat height of 17 to 19 inches is comfortable to stand up from; low seats look elegant and get less generous as knees age.
- Does the back support your shoulders, or stop at your mid-back and leave your head unsupported?
- Is the arm at a height you could sleep on? People nap on sofas, whatever they tell the salesperson.
- Do you slowly slide forward? A seat that slopes the wrong way is not fixable with cushions.
- Is there a hard frame edge behind your knees? On a shallow seat you feel that every time.
- Can you get up without pushing off the arm? Try it a few times, not once.
Not asking what the frame is made of
The frame decides the lifespan and is the one part you can never inspect after purchase. What you want to hear is kiln-dried hardwood, joined with dowels or corner blocks that are glued and screwed. Kiln drying matters because green wood keeps shrinking after the sofa is built, loosening every joint in it. What you do not want is particleboard or thin softwood held together with staples.
There is a test you can do in the store. Lift one front corner about six inches off the floor. If the other front leg stays down, the frame is twisting, and a frame that flexes in a showroom is a wobbling sofa in three years. A long frame warranty is a real signal — it is the manufacturer telling you what they expect it to survive.
Ignoring what is inside the cushions
| High-density foam core | Holds its shape longest, firm at first, softens into its best years around month six |
|---|---|
| Foam wrapped in down or fiber | The most popular compromise. Looks soft, needs plumping every week or it goes lumpy |
| All down or feather | Deeply comfortable, collapses when you stand up, high maintenance forever |
| Polyester fiber alone | The cheapest fill and the first to flatten. Common in sofas sold as bargains |
| Spring-down | Supportive and long-lived, priced accordingly, heavy to move |
Suspension sits under the cushions and matters just as much. Sinuous springs — the S-shaped wires you can feel through the deck — are the normal modern answer and perfectly good. Eight-way hand-tied is the traditional high-end version. Elastic webbing is light and varies enormously in quality.
Two details predict aging better than the fill does. Cushions you can flip and rotate outlast cushions you cannot, which is why attached back cushions look neat in year one and permanently dented in year five. And zippered covers mean the foam can be replaced in year eight for a fraction of a new sofa.
Choosing fabric from a photograph
Upholstery fabric is rated for abrasion, in double rubs in the United States or Martindale cycles in Europe. The absolute figures matter less than the comparison: ask for the number on the two fabrics you are choosing between, because a difference of several times over is common and invisible in a photograph.
Weave matters as much as the rating. Loop weaves and bouclé catch on claws, so they are a poor match for a cat. Tight flat weaves resist pilling; loose ones snag on zippers and belt buckles. Real leather takes on a patina and can be conditioned; bonded leather peels off in flakes and cannot be repaired. And a light sofa with washable removable covers is more practical than a dark one with the covers stapled on, which is the opposite of what most people assume.
Order swatches first. Look at them at night under your own bulbs, and rub them hard with a thumbnail to see whether the surface pills.
Forgetting the sofa has to live in a room
Arm style eats width. Two sofas of the same overall length can differ by a foot of usable seat depending on whether the arms are slim or generously rolled, so compare seating width rather than the outside dimension. Check back height against the windowsill behind it, because a high back cutting across a window is hard to unsee. Visible legs make a room feel larger and let a vacuum underneath; a skirt does neither.
With sectionals, the chaise side is close to permanent. Some are reversible and most are not, and the correct side is decided by where the door and the television are, not by which way the showroom had it turned.
The version that avoids all six
- Measure the delivery route before you shortlist anything.
- Sit for ten minutes in the posture you use at home.
- Ask three questions: what the frame is, what the cushions are filled with, whether the covers unzip.
- Get swatches into your own living room, at night.
- Read the return terms, particularly the will-not-fit clause.
- Choose the size that leaves your walking routes intact, not the largest the wall will take.
On delivery day, keep the tag. The model number and the fabric name, photographed and stored somewhere findable, are what let you order a replacement cushion insert in year seven. That one photograph is the difference between a sofa you repair and a sofa you replace.