I have to admit something: I am not "hip."

If you had asked me a week ago who Virgil Abloh was, I would have given you a blank stare. We definitely didn’t hang in the same circles (Kanye West, Kim Kardashian, Rihanna, Bella Hadid, Venus Williams, Joe Jonas, Ricky Martin, etc.)

While I’ve been buried in residential floor plans, elevation details, and code regulations, Virgil was busy redefining global fashion, heading up menswear for Louis Vuitton, and building his iconic streetwear brand, Off-White.

Then I learned three things that changed my perspective completely:

First, today—September 30th—would have been his 46th birthday.

Second, despite his massive fame in fashion, he was actually a trained architect with a Master of Architecture from the Illinois Institute of Technology.

And third, he operated on a core design philosophy he called the 3% Approach—the idea that you don't need to reinvent the wheel to create something entirely new; you only need to alter an existing design by 3%.

While that 3% tweak created a fashion revolution, it raises a massive question for our industry: Where is the line between inspiration and copyright infringement?

More on that later. First, let's dig deeper into Abloh's philosophy.

Virgil Abloh’s approach to design—defined by his signature "3 Percent Approach" (modifying an existing design by just 3% to create a new concept) and Marcel Duchamp’s philosophy of "readymades"—sparked intense debate. Critics and fellow creators accused him of plagiarism and appropriation, while legal disputes over trademark and copyright infringement were brought against him and his brand, Off-White.

Rather than starting from scratch, Abloh treated existing designs as raw material. He believed that a 3% adjustment—adding quotation marks around text, applying diagonal hazard stripes, or inserting a doorstop under a chair leg—was enough to make a product unique to his brand.

While his fans saw this as brilliant postmodern commentary, not everyone saw those small changes as inventive.

Abloh’s work drew accusations of copying, and he and his companies faced legal disputes. But those cases involved different questions—including trademarks and photographs—so they don’t tell us whether changing 3% of someone else’s house plan is enough. That’s the question I kept coming back to.

During my meander, I shared my findings with regular Meander contributor Roberta D'Andrea, who had this to add.

So where is the line?

That question brings me to a claim I’ve heard throughout my career: “You can use someone else’s house plan as long as you change it by _%.”

I’ve heard different numbers plugged into that blank. Twenty percent seems to be a favorite. Abloh’s 3% approach puts the myth in especially sharp focus—but neither number is a rule of copyright law. You can’t measure a plan, move enough walls to hit a target percentage, and declare the result safe.

The distinction is between an idea and a particular design. No one owns the idea of a butler’s pantry, a split-bedroom layout, or a two-car garage. Copyright can, however, protect a building’s original overall form and the arrangement and composition of its spaces. Changing a few details doesn’t automatically erase what remains from another designer’s work.

Here’s where the story gets uncomfortable for those of us who design homes in the Southeastern U.S.

In 2008, the Eleventh Circuit decided Intervest Construction v. Canterbury Estate Homes. The court treated the protection for the plans at issue as “thin” and concluded that differences in the plans’ protected arrangement were significant enough to rule out infringement. It affirmed a judgment for the defendant before the case reached a jury. It did not announce a percentage-change rule—but it gave substantial weight to differences between plans that also had a great deal in common.

👉View the judge's written decision (scroll to the last two pages to view the house plans in question).

That reasoning resurfaced in Home Design Services v. Turner Heritage Homes. This time, a jury had found infringement and awarded the designer $127,760. The trial judge set the verdict aside, and the Eleventh Circuit affirmed. The court concluded that the plans’ shared features largely reflected a customary house style, while differences in dimensions, walls, and the arrangement of other features ruled out infringement under Intervest.

One judge agreed that Intervest controlled the outcome but called it a “wrong turn” in the court’s copyright decisions. I can understand why. If you’re the person whose plan has been copied, being told that the differences matter more than the similarities can feel like protection in name only.

Then came Arthur Rutenberg Homes v. Jewel Homes, where the judge wrote in their decision, "No one... owns a copyright to the idea of a four–three split style."

After that Eleventh Circuit decision, AIBD filed a brief supporting a request for the U.S. Supreme Court to take the case. We had also joined an earlier brief supporting review of Home Design Services, alongside the Texas Institute of Building Design, Design Basics, Frank Betz Associates, and Arthur Rutenberg Homes. We wanted the Court to address what we saw as a serious problem with the scope of protection for architectural works. The Court declined to hear either case.

So what should you take from all this?

Not that copyright is useless. And certainly not that changing 3%, 20%, or any other percentage gives someone permission to use your plan. The harder truth is that, in the Eleventh Circuit, proving infringement of a residential design can be difficult when the shared features are considered standard, and the differences lie in the protected arrangement.

My practical rule is simpler than a percentage: If a client brings you another designer’s plan and asks you to “just change it enough,” don’t start counting changes.

Find out what permission they have to use it. If they don’t have permission, use their needs—not the other designer’s drawing—as the starting point for your own design.

While we're at it, here are a few other tips.

1. The Copyright Office will most likely be raising its fees in mid-November—register your designs before then to save money.
2. AIBD provides its Copyright Basics for Home Designers & Builders handbook, written by attorney David Bennett, to all AIBD members in your AIBD.org/Membership-Account.
3. While you're there, download the Copyright Stamp image to include on all your CDs.

Abloh’s 3% approach makes for a fascinating conversation about creativity.

I don’t want a world where every butler’s pantry belongs to the first person who drew one. But I also don’t want a world where someone can take your plan, move a few elements, and call it theirs.

Maybe one day the Supreme Court will give us a clearer line. For now, we’re left making that judgment in our own work—and seeing how differently others make it.