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The Many Parts of a Couch (2 Illustrated Diagrams)

Ever wonder what the many different parts of a couch are on the outside and inside? We put together this custom diagram illustrating the anatomy of a sofa. It's very cool and detailed. You'll love this.

Grey sectional sofa in living room

Have you ever wondered exactly all what’s involved in couch design with respect to all the different parts of a couch. It’s a fairly complex piece of furniture.

There are many parts both on the exterior and interior. We decided to dig in and get to the bottom of the anatomy of a sofa and put together a custom diagram showing you all the different components to a couch design. Below is our diagram that includes a very informative cross-section so you get a glimpse of what’s inside a typical sofa.

Enjoy (and if you think this is useful or cool, please pin and share).

Parts of a Couch (Diagram)

Diagram illustrating the different parts of a couch

Sofa Exterior Components

  • Cushion Boxing: Typically made up of two or three cushions usually firmer than the back cushions to support the weight of the sitter.
  • Arm Panel: An armrest that has an either inset or raised panel covered to the front of the arm.
  • Throw Pillow: Small pillow on a chair used chiefly for decorative purposes.
  • Back Pillows: Back cushions that keep the sitter comfortable and improve posture while seated.
  • Top Cushion: Chief cushion to sit on.
  • Inside Arm: The arm frame without the cover or upholstery.
  • Inside Back: Area from the top of the seat cushion to the back.
  • Outside Back: The upholstered part from the top of the seat to the foot of the sofa.
  • Outside Arm: The upholstered part of the armrest.
  • “T”: The cushion resembles a chunky letter “T.”
  • Side Skirt: Fabric covering found at the sides by the foot of the sofa.
  • Corner Skirt Panel: The pleated part of the fabric covering found at the corner by the foot of the sofa.
  • Front Skirt: Fabric covering found at the front by the foot of the sofa.
  • “T” Seat Cushion: The seat cushion that resembles a chunky letter “T” where extensions of the cushion cover the sofa’s front sides and under the armrests.
  • Front Skirt Panel: The pleated part of the fabric covering found by the front of the foot of the sofa.
  • Seat Cushion: A soft padding that makes sitting comfortable.
  • Cushion Reverse: The bottom part of the cushion boxing.
  • Welt: A fabric-covered rope stitched along the seams of an upholstery for a more tailored look.
  • Arm: Where the sitter can comfortably rest his/her arm while sitting.
  • Leather of Fabric: Sofa covering.
  • High Rebound Sponge: Sponge that has higher than 45 density.
  • Backrest: Supports a person’s back when seated.

Sofa Interior Parts

  • Mid-Soft Sponge: Sponge that has a density not suitable for sitting.
  • Parallel Net: Inside net placed parallel along the wood frame.
  • Crest Rail: Top rail of a chair back.
  • Composite Splint: Makes the framework of the arm and side of a sofa.
  • Wood Frame: Skeleton of the sofa.
  • Serpentine Spring: Spring that runs from front to back or from top to bottom.
  • Stainless Steel Foot: Foot of the sofa that raises it from the floor.
  • Parallel Hardware: Steelwork underneath the inside of a sofa.
  • Webbing Bridge: Used for holding webbing to flat surfaces.
  • Fixed Sponge: Placed at the most bottom level of the inside of the sofa.
  • Density Sponge: Adds support and durability underneath.
  • Doll Cotton: Spray-bonded cotton
  • High Density Resilient Sponge: Makes a cozy and durable seating.