Every week, a sign shop gets the same request: “Make the letters bigger.” And every week, the real problem isn’t the letters — it’s that the sign was sized and placed without thinking about where people will actually see it from. A sign that’s too small for its viewing distance is invisible; a sign that’s too large for its setting looks clumsy and can even violate municipal rules. Sign sizing and placement is a science with well-established rules of thumb, and this post will walk you through them so you can plan signage that drivers and pedestrians can actually read.
The Rule of 30 Metres Per 2.5 cm of Letter Height
The classic guideline used by sign professionals is simple: for every 2.5 cm (1 inch) of letter height, a sign gains roughly 30 metres (100 feet) of readable distance. A 15 cm (6-inch) letter is legible from about 180 metres away — at highway speeds, that’s only a few seconds of reading time, which is why freeway signage uses much larger letters. On a Toronto side street where traffic moves at 40–50 km/h, a 10–15 cm letter on a storefront is usually plenty for drivers, while pedestrians at close range can read letters half that size. The corollary is that bigger isn’t always better: a massive sign crowded with text is harder to scan than a smaller one with fewer, larger words.
Matching Sign Type to Setback and Speed
Your building’s setback — the distance from the sign to the road — dictates what type of sign makes sense:
- Storefront signs on buildings set back less than 5 metres work at 15–30 cm letters; they’re read by pedestrians and slow traffic.
- Projecting signs that hang perpendicular to the facade are visible from further down the block, so they suit businesses on narrow shopping streets where the storefront sign is hidden by parked cars.
- Monument signs near the road are ideal for plazas and office parks set back 10–30 metres; they carry the business name at 30–60 cm letters.
- Pylon signs for highway-fronting properties can use 60–90 cm letters, sized for 100+ km/h viewing and multi-lane approach angles.
Speed matters as much as distance. A driver at 50 km/h covers about 14 metres per second; at 100 km/h, 28 metres per second. Every extra second of reading time you buy with larger letters and higher contrast is a second of safe, confident navigation — and often the difference between a customer turning into your lot or driving past.
Height and Sightlines: The Angles That Matter
Placement height is where most DIY signage goes wrong. A sign mounted too high is read at an uncomfortable angle and vanishes against rooflines and trees; one mounted too low gets blocked by parked cars, pedestrians and snowbanks in winter. The practical sweet spot for most storefront signs is between 2.5 and 4.5 metres above grade, angled slightly downward so pedestrians on the sidewalk see the face. For monument signs, the bottom of the sign should clear roughly 60–90 cm so landscaping and snow don’t obscure it, with the face angled toward the primary approach. And always check the sightline from the driver’s seat: measure the viewing angle from the road to the sign face. If it’s much more than 15 degrees off perpendicular, the sign will be nearly unreadable for oncoming traffic.
Toronto By-Law Considerations
Before you settle on final dimensions, remember that Toronto’s sign by-law regulates height, size, projection and illumination by zoning district, and many commercial leases cap sign area as a percentage of facade. A sign that’s perfect optically can still be illegal, so it’s worth confirming compliance early. In practice, the city allows storefront signs up to certain area limits depending on your street classification — a professional sign shop will verify your property’s zoning before fabricating, and can handle the permit application so you’re not stuck with a sign you can’t legally install.
Test Before You Commit
Here’s the trick experienced sign installers use: mock up the sign at full size using printed templates taped to the wall, then walk, drive and bike past it at the distances you expect customers to see it from. Check it in daylight, at dusk, and under street lighting. If you can read the name comfortably from the approach — and your message still fits in three seconds of glance time — your sizing is right.
Planning a new sign and unsure about size or placement? The team at JC Signs designs, fabricates and installs signs across the GTA, and we size every project from the actual viewing distance — not a guess. Call 416-275-5164 or request a free quote and we’ll help you get it right the first time.
