Deep Sectional Sofas: The Oversized Comfort Upgrade Your Living Room Needs

Some sofas are for sitting. A deep sectional sofa is for actually living in — movie marathons, Sunday naps, the whole family piling on for game night. If you've ever perched on a sofa that felt too shallow to be comfortable, this is the fix.

The short answer: A deep sectional sofa has a seat depth of 24 inches or more, compared to a standard sofa's 20–22 inches. That extra depth lets you curl up, stretch out, or sit cross-legged without sliding to the edge. They come in L-shaped, U-shaped, and modular configurations — and they're the single biggest comfort upgrade most living rooms can make.

What Makes a Deep Sectional Sofa Different?

A deep sectional sofa is defined by its generous seat depth: 24 inches or more, versus the 20–22 inches on a standard sofa. Those extra few inches change everything about how the furniture feels.

A standard sofa is sized for upright sitting. A deep-seated sectional is sized for comfort — the kind where your back actually reaches the cushion and your feet can stay off the floor. It's built for real life: reading, resting, hosting, lounging through a three-episode streak.

Deep sectionals come in larger footprints too — L-shaped for corners, U-shaped for open-plan rooms, and modular designs that grow with your household. Explore Koala's modular sectional collection to see the full range.

What to Look for Before You Buy

Seat depth is the first number to check — but it's not the only one. Here's a quick comparison of what separates a deep sectional from a standard one:

Beyond the numbers, pick your configuration based on how you use your room:

• L-shaped — fits into corners, works in most living rooms

• U-shaped — maximum seating, needs more open floor space

• Chaise — extends one end for full-length lounging

• Modular — start with fewer sections and add as your needs change

Modular builds offer the highest level of long-term flexibility. Koala's Torquay Modular Sofa features an expansive 27-inch seat depth and scales fluidly from 2 to 9+ sections in Regular or Extra Wide layouts. Meanwhile, the Bangalow Modular Sofa brings a 30-inch seat depth designed for serious afternoon naps, offering 13 distinct pre-curated configurations across 2 to 9+ foundational sections.

Built to Last

A deep sectional sofa gets used more than any other piece of furniture in your home. Construction quality is what determines whether it still looks and feels right in year five.

What to check before you buy:

• Frame: Solid hardwood or kiln-dried engineered wood. Kiln-drying removes moisture that causes warping over time — it's not just marketing language; it matters.

• Seat support: Spring-supported bases hold shape longer than foam-only constructions and recover better after sustained use.

• Cushion fill: High-density foam holds its shape and is low-maintenance. Fiber-down blends are softer and more sink-in, but need occasional fluffing. The best sofas layer both.

Koala is a certified B Corp — an independently verified standard for environmental and social performance, not a self-assigned label. Every sofa in Koala's modular sectional range comes with a 5-year warranty.

Fabric Care and Cleaning

The right care routine keeps a deep sectional sofa looking good through years of heavy use.

• Spills: Blot immediately with a clean, dry cloth. Blot — don't rub. Rubbing pushes liquid deeper into the fabric.

• Everyday marks: Spot-clean with a damp cloth and a small amount of mild detergent. Test on a hidden area first.

• Removable covers: Machine-wash on a gentle cold cycle, then air dry to maintain shape and color. Koala's modular sofas include removable, washable covers as standard.

• Cushions: Rotate and flip seat cushions every one to two months to even out wear and keep the fill consistent.

Koala fabric options

• The Torquay Collection features smooth, velvety, linen-like performance fabrics crafted with everyday life in mind. Depending on your color choice, you get either a 100% recycled polyester weave or a durable 65% polyester / 35% recycled polyester blend. Every configuration comes with completely removable, cold-machine-washable outer covers.

• The Bangalow Collection takes a more textured, tactile approach. It's wrapped in a sophisticated, liquid-repellent bouclé weave built to shrug off spills. Its standard colorways feature a 70% polyester / 30% recycled polyester mix, while its ultra-plush Luxe finishes leverage an 86% recycled polyester composition. Like the Torquay, the entire cover system unzips easily for a spin through the washing machine.

The easier the care process, the more likely you'll actually do it. Removable covers are the single most practical feature on a sectional that sees daily use.

Shop Koala's Deep Sectional Sofas

Koala makes two modular deep sectional sofas built for serious comfort — both with spring-supported seating, removable and machine-washable covers, and tool-free assembly.

Torquay Modular Sofa Regular and Extra Wide. 2 to 9+ sections. Clean, contemporary proportions.

Bangalow Modular Sofa 13 configurations: sofa, chaise, corner, U-shaped. 2 to 9+ sections. Built for bigger spaces and bigger households.

Both come with free delivery, a 120-night trial, and a 5-year warranty. Try it in your own home — if it's not the right fit, return it.

Shop our deep sectional sofas →

Also worth reading: Best Sectional Sofas of 2026: Tested for Durability, Comfort and Value · Best Sofas and Sectionals

Ready to find your fit? Koala's modular sectional sofas come in two collections, dozens of configurations, and ship free with a 120-night trial. If it doesn't feel right in your home, return it — no questions asked. Shop our deep sectional sofas →

Frequently Asked Questions

What is a deep sectional sofa?

A deep sectional sofa has a seat depth of 24 inches or more — significantly deeper than a standard sofa's 20–22 inches. That extra depth gives you room to sit cross-legged, curl up, or stretch out without feeling cramped. They typically come in L-shaped, U-shaped, or chaise configurations to maximize the lounging area.

How is a deep sectional different from a regular sectional?

The main difference is seat depth. A regular sectional is sized for upright sitting; a deep sectional is designed for lounging — the kind of sofa you sink into rather than perch on. Deep sectionals also tend to have lower seat heights and more generous cushioning.

What configuration is best for a deep sectional sofa?

It depends on your room and how you use it. L-shaped fits neatly into corners and works in most living rooms. U-shaped or double-chaise gives maximum lounging space but needs more floor area. Modular designs — like Koala's Bangalow or Torquay — let you start with your current space and expand later.

Are deep sectional sofas hard to clean?

Not if you choose the right one. Sectionals with removable, machine-washable covers are the easiest to maintain — pull the covers off, wash them, put them back. For everyday marks, blot spills immediately and spot-clean with a damp cloth and mild detergent.

What's the best fabric for a deep sectional sofa?

Performance fabrics — typically tightly woven polyester or microfiber blends — are the most practical for heavy daily use. They resist staining, hold color well, and clean up easily. If you have kids or pets, prioritize options with removable, washable covers above everything else.