When choosing a sofa, it’s easy to focus on fabric and colour—but one often-overlooked detail that can have a big impact on the overall look and feel of your sofa is the cushion style. Whether you’re drawn to a more relaxed or refined aesthetic, understanding the differences between knife edge and box edge cushions—as well as the subtle effect of piped vs welted finishes—can help you make a more informed and personal design choice.
Knife Edge Cushions
Knife edge cushions offer a casual or relaxed aesthetic with a single welt/seam, ideal for those seeking a contemporary and understated vibe in their home decor.
Best suited for:
- Sleek and simple design
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Modern and contemporary appeal
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More relaxed and informal interiors
Box Edge Cushions
Box edge cushions come with two welts/seams providing a more defined and formal appearance. This style adds a touch of tradition to any room, making it an excellent choice for those who prefer a classic and sophisticated look.
Best suited for:
- Rooms with a more formal and structured appearance
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Traditional and elegant settings
Piped vs Welted Finish
Once you've decided on your cushion shape, the next design choice to consider is whether you'd prefer a piped or welted finish. This refers to the seam detail that runs along the cushion edges—and while it may seem minor, it can affect the overall visual language of the sofa.
Piped Finish
A piped finish features a tight, rounded cord inserted into the seam of the cushion. It adds subtle structure and definition, and is typically associated with a more formal or traditional look. It can be seen on sofas like the Salthrop, where the cushion edges and base appear more tailored and sculptural. Having this finish, would make your sofa feel neater and more tidy as the piped finish is very compact.
Welted Finish
A welted finish, by contrast, is flatter and extends about 1cm beyond the cushion, offering a more relaxed and contemporary appearance. This is the standard finish you’ll see on many of our sofa styles, including the Coco, where the cushions and base have a more laid-back feel with less visible edge definition.
No Piping or Welting
Some of our sofas, such as the Felix Big Back, are designed with no piping or welting at all, giving them an especially minimal and clean look. This finish removes any extra edge detail, resulting in a very tidy and understated appearance. It’s ideal for customers who prefer a simple, modern aesthetic where the shape and fabric take centre stage without additional trimming.
Best suited for:
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Minimalist interiors
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A clean and contemporary aesthetic
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Those who prefer an unfussy, seamless finish
Customising Your Sofa
Both cushion styles are available across many of our made-to-order sofas, and finishes can be tailored to suit your preferences. For example, if you love the shape of the Coco sofa but want it to feel more formal, you can opt for a box edge cushion with a piped finish. Conversely, if you’re looking for something clean and relaxed, a knife edge cushion with welted seams might be ideal.
As always, the best option will come down to your personal taste, how you use your space, and the overall atmosphere you want to create.
If you’d like further guidance on cushion styles or finishes, please feel free to get in touch with our team at sofas@sophieconran.com.