After 30-plus years of designing and building signs on the Monterey Peninsula, we could write this post from memory. The sign design mistakes that cost businesses customers haven’t changed. The technology has evolved, the materials have improved, but the fundamental errors? Exactly the same today as they were in the 1990s.

Every one of these mistakes is avoidable. They happen because signs get designed in a vacuum — on a laptop screen, in a conference room, by someone who hasn’t stood on the sidewalk and watched how people actually approach the building. Here are the ones we see most often.

Mistake #1: Too Many Words on the Sign

This is the most common sign design mistake we encounter, and the hardest one to talk clients out of. Business owners want their sign to say everything: name, tagline, services, phone number, website, hours. The instinct makes sense — you’re paying for this space, so why not use every inch of it?

Because your sign has about three seconds. That’s it. A driver at 35 mph covers 50 feet per second. A pedestrian gives you maybe five to eight seconds. Either way, a sign with more than seven or eight words is unreadable at any real-world speed. The most effective exterior signs communicate their primary message in three to five words.

Your sign has one job: identify your business and make people want to come closer. Name, maybe a logo, maybe a single descriptor. Everything else — the phone number, the URL, the services list — goes on the door, the window, or the monument sign where someone is already standing close enough to read it. (More on this in Mistake #5 below.)

Mistake #2: Ignoring the Building and Street Context

A sign doesn’t exist on a white background. It lives on a building, next to other signs, against landscaping that changes with the seasons, in light that shifts by the hour.

This is the mistake that produces the most expensive regrets. A dark sign on a dark building vanishes. A sign designed without considering the storefront next door looks like it belongs to the wrong business. A monument sign positioned perfectly in February sits completely behind a wall of foliage by June.

On the Monterey Peninsula, context is especially unforgiving. Our fog, overcast skies, and marine layer wash out colors that pop in direct sun. A sign that reads beautifully in Sacramento may disappear on Lighthouse Avenue in Pacific Grove on a typical July morning. We design for Peninsula light conditions, not for sunny-day mockups, because peak tourist season — when your sign needs to work hardest — is exactly when fog is most common.

Trees grow. Buildings get repainted. Neighboring tenants change their signage. A good sign design accounts for the world it’s going to live in, not just the logo it needs to display.

Mistake #3: Approving a Design Without a Site Visit

This is the one that produces the most avoidable failures. The business owner approves a design by reviewing a PDF proof on a laptop or phone. Colors, proportions, and readability look completely different on a 15-inch screen versus a building facade in real-world lighting. Nobody stands in the parking lot. Nobody walks the sidewalk from the direction customers actually approach.

We do a full site visit before we start designing — not just for measurements, but for context. Building color, neighboring signs, sight lines, how the light shifts throughout the day, where the trees and utility poles are. The common thread in signs that don’t work is almost always the same: nobody looked at the site before the design was finalized.

Mistake #4: Copying the Neighbor Instead of Contrasting

If every business on the block has white channel letters on a blue background, adding another set of white channel letters on a blue background makes you invisible. The sign that gets noticed is the one that’s different from its context.

This doesn’t mean garish or out of place. It means intentional. A warm wood sign on a street of plastic. A dimensional sign on a street of flat panels. A clean, minimal design on a block of visual clutter. Differentiation is one of the most powerful tools in sign design, and most business owners never think about it because they’re looking at their sign in isolation instead of in the context of the streetscape.

In Carmel-by-the-Sea, where the sign ordinance channels nearly everyone toward carved wood or sandblasted HDU, the temptation to blend in is especially strong. The best Carmel signs distinguish themselves through color, carving depth, mounting approach, and material finish — they stand out while still respecting the aesthetic vocabulary of the town. A cookie-cutter carved sign disappears on Ocean Avenue. A thoughtfully designed one stops pedestrians in their tracks.

Mistake #5: Putting the Phone Number and URL on the Building Sign

This one is counterintuitive, and we have the conversation at least once a month.

Almost nobody copies a phone number from a building sign. Almost nobody types a URL they glimpsed while driving past. If someone is close enough to read a phone number on your facade, they’re already standing at your front door. Your exterior sign doesn’t need to provide contact information — it needs to make someone want to walk in.

The exterior sign is the headline. The door, the window, and the A-frame on the sidewalk are the fine print. Research shows that the majority of consumers will enter a store they’ve never visited before based solely on the sign. That decision is driven by how the sign makes the business look — professional, inviting, worth their time. Not by a phone number.

Every character you add to a sign — phone, URL, tagline, services list — competes with the primary message for attention and space. The letters get smaller. The layout gets more cramped. The three-second window gets harder to use. Let the sign do its job and put the details where people will actually use them.

Four More Sign Design Mistakes Worth Knowing

The five mistakes above are the ones we fix most often. These four are close behind.

Poor color contrast. The single biggest factor in sign readability is contrast between letter color and background color. Medium blue on medium green, maroon on dark brown, gray on silver — nearly unreadable at any distance. If your brand colors don’t create strong contrast, your sign colors need to adapt. We break down the contrast rankings and the science behind them in our visibility guide.

Decorative fonts that sacrifice readability. Script fonts and ultra-thin weights look gorgeous in a logo but fall apart on a sign viewed from across the street. Quick test: if you can’t read it at a glance at two inches on your phone screen, it won’t read at 50 feet on a wall. Sans-serif weights at medium-to-heavy thickness outperform decorative fonts at every distance that matters.

Letters that are too small for the viewing distance. One inch of letter height per 10 feet of viewing distance is the starting point, but the real answer depends on traffic speed, fog, and your specific sight lines — and the math is in our letter-height guide referenced above.

Forgetting about nighttime visibility. The Peninsula’s tourism economy means significant foot traffic after dark — dinner in Carmel, Cannery Row, downtown Monterey. If your business operates evenings and your sign has no illumination, you’re invisible to a large share of your audience. The right illumination approach depends on your sign type, your building, and your local sign code — and in design-review jurisdictions like Carmel, on what is even permitted.

Getting the Design Right Before the Sign Goes Up

Every one of these sign design mistakes shares a root cause: the design was evaluated on a screen instead of at the site. Start with the building, not a blank canvas. Test readability before committing to fabrication. And work with a sign company that will tell you what won’t work before you’ve paid for something that doesn’t.

That’s how we’ve approached every project for 30-plus years. If you’re planning a new sign — or wondering whether your current one is making these mistakes — we’re always happy to walk the site with you and give you an honest assessment.