How to Know If a Sofa Will Fit Through Your Door: Online Planner

How to Know If a Sofa Will Fit Through Your Door (+ Online Planner)

You've measured the living room. The sofa fits. Then delivery day arrives and three men are standing in your doorway with a 2.8-meter sofa and nobody is moving.

This is a different measurement problem than most people prepare for — and it has a specific fix. Here's how to know, before you buy, whether a sofa will actually make it through your door.

Use a room planner online to verify the room fit first, then use the calculations below to verify the delivery path. Both checks, before you pay.

Why the Doorway Is the Hardest Part

A sofa that fits your room can still be undeliverable. The room is the easy problem — you have space to maneuver, rearrange, and compensate. A doorway gives you nothing. It's a fixed frame and you either clear it or you don't.

Three variables control whether a sofa passes through a door:

1. The door opening width and height
2. The sofa's dimensions (width, height, depth — and diagonal depth)
3. The approach: is there a straight run, a turn, a staircase?

Most people check one or two. The one they miss causes the problem.

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The Measurement You've Probably Never Heard Of: Diagonal Depth

Standard sofa specs list width, depth, and height. None of those tell you what you need for doorway clearance.

The critical number is diagonal depth — the measurement from the top-back corner of the sofa to the bottom-front corner. This is the dimension that determines whether a sofa can be tilted through a doorway.

When movers can't get a sofa through a door standing upright, they tilt it. The sofa rotates onto its back legs and gets walked through at an angle. The diagonal depth is what now needs to clear the door height.

How to find it: Some retailers list diagonal depth in specs. If not, request it before purchasing — it's a standard measurement any manufacturer can provide. Do not estimate it.

The clearance check: Diagonal depth must be less than the door opening height (typically 200–210 cm). Account for the door frame — actual clearance is usually 2–3 cm less than the door height.

The Full Doorway Checklist

Door opening width Measure frame to frame, not wall to wall. Standard interior doors run 76–91 cm. The sofa's depth (front to back) must fit through with clearance to maneuver. Tight is 5 cm. Less than that is a problem.

Door opening height The diagonal depth check applies here. Also check: can the sofa pass through upright without hitting the top frame? Tall sofas with high backs may not clear even if diagonal depth works.

Hallway width Must be at least as wide as the sofa's depth — plus room for the movers to hold it while walking. A good working minimum is sofa depth + 60 cm.

Turns A sofa turning a 90-degree corner follows specific geometry. Working rule: sofa length minus hallway width must be less than the corridor on the other side of the turn. Hallway 100 cm wide, sofa 250 cm long — you need at least 150 cm of corridor on the other side.

Staircase If the sofa needs to go up or down stairs, diagonal depth becomes even more critical. Ceiling height on the stairwell matters as much as door height.

The Numbers to Pull Before You Buy

From the retailer:

1. Overall width, depth, height
2. Diagonal depth (the critical one — request it if not listed)

From your home:

1. Door opening width and height (frame to frame)
2. Hallway width at the narrowest point
3. Both corridor lengths at any 90-degree turn
4. Staircase ceiling height if applicable

If all of these clear, the sofa is deliverable.

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Once You've Confirmed Delivery: Check the Room

Clearing the door is necessary. It's not sufficient.

Use Coohom's room planner to confirm the sofa works in the room — to scale, in 3D, with your existing furniture placed. A sofa that gets through the door and then overwhelms the room is a different kind of expensive problem.

Verify room fit first, then delivery path: Free Room Planner →

What to Do If the Numbers Don't Clear

Ask about disassembly. Many sofas deliver in sections — frame separate from cushions, legs removed. Ask explicitly: does this model disassemble for delivery?

Request white-glove delivery. Some services include disassembly, delivery, and reassembly. Worth it if the alternative is a return.

Consider modular. Individual sections clear almost any door, assembled in-room. If you're still shopping and the doorway is narrow, modular is the practical answer.

Size down. A sofa 20 cm shorter usually has a proportionally smaller diagonal depth. A scaled-down version of the same model often clears when the original doesn't.

Quick Reference

Sofa confirmed deliverable? Check the room next: Will My Furniture Fit? How to Check Before You Buy