How to Measure for a Sectional (So It Actually Gets Inside)

A sectional is the biggest single thing most people ever bring into a living room — and the most common reason a delivery ends in frustration isn't that the sectional is too big for the room. It's that it couldn't get to the room. Measuring properly takes about fifteen minutes and a tape measure, and it saves everyone a very long afternoon.

Step 1: Measure the room itself

Start with the wall the sectional will sit against. Measure wall to wall, then subtract anything that sticks out: radiators, baseboard heaters, window trim, outlets you want to keep reachable. Then measure how far the sectional can come out into the room before it blocks a walkway.

• Leave 30–36 inches for main walkways — less feels cramped, more feels like an airport.
• Leave 14–18 inches between the front of the seat and a coffee table so knees and drinks both fit.
• If a chaise faces a doorway, check that the door can still open fully.

Step 2: Measure the path

Walk the exact route the delivery will take, from the truck to the room. At every pinch point, write down three numbers: width, height, and — for hallways — the length before the next turn.

1. 1Front or side door: width with the door fully open, and height.
2. 2Any hallway the piece passes through: width, and the distance to the next turn.
3. 3Stairs: width, ceiling height above the stairs, and the size of any landing or turn.
4. 4The room's own doorway, which is often the narrowest of all.

Step 3: Learn the diagonal depth

Here's the number that matters most and that almost nobody checks. A sofa section is carried through a doorway on its back or tipped on end, which means the relevant measurement isn't its straight depth — it's its diagonal depth: the distance from the top back corner to the front bottom edge of the seat.

To estimate it, hold a straight edge from the top of the back to the front of the arm, and measure from the bottom back corner up to that edge at a right angle. If the diagonal depth is smaller than your doorway width, the section will fit through, even if its straight depth looks too big.

Step 4: Know how it comes apart

Sectionals arrive in pieces, and the pieces are what has to fit, not the assembled shape. Ask which piece is largest. Ask whether the legs unscrew, whether the back cushions are attached, and whether the arms come off. Each of those can buy you several inches.

Step 5: Choose the shape for the room

Left-arm-facing and right-arm-facing are named as you stand facing the sectional, not sitting on it. An L-shape fills a corner and defines a room; a U-shape is the ultimate family movie setup but needs a big room; a sofa-with-chaise gives you the lounge spot without committing a whole wall.

• Corner sectionals: measure both walls from the corner outward.
• Open-plan rooms: a sectional's back can act as a wall — leave a walkway behind it.
• Small rooms: an armless or slim-arm design gives you a seat back instead of padding.

“Measure the path twice, the room once.”

Bring your numbers in, along with a photo of each doorway, and we'll check them against the exact pieces you're looking at. Or drop the sectional into the Room Planner at your real dimensions before you ever leave the house.