Choosing an illuminated sign for your shopfront is not simply a matter of making the sign as large as possible. A sign that is too small may be difficult to notice from the street, while an oversized sign can look unbalanced against the building and may not suit the available fascia space. The right size depends on your shopfront, viewing distance, traffic, logo design and installation position. If you're planning illuminated signage in Adelaide, here are the main factors to consider before choosing your sign dimensions.
Start with the Viewing Distance
The first question to ask is:
How far away will customers be when they first need to read the sign?
A café on a pedestrian shopping strip has very different requirements from a business that needs to be noticed by drivers from across a car park or busy road. As a general signage rule of thumb, approximately 25mm of letter height for every 10 metres of viewing distance can be used as a minimum starting point, with larger lettering usually providing more comfortable readability. Moving traffic often requires larger lettering again.
For example:
| Approx. Viewing Distance | Letter Height to Consider |
|---|---|
| 5–10 metres | 50–100mm+ |
| 10–20 metres | 100–200mm+ |
| 20–30 metres | 150–300mm+ |
| 30 metres+ | Larger custom sizing recommended |
These are only general starting points. Font style, contrast, lighting and the building itself can significantly affect readability.
Consider Whether Customers Are Walking or Driving
A customer walking past your shop has more time to read your sign. Someone driving past at 50 km/h does not.
If your business faces:
- A main road
- A large car park
- A busy intersection
- Fast-moving traffic
your illuminated shopfront sign may need larger letters and a simpler design. For businesses in pedestrian areas, smaller illuminated letters can still work well because customers are viewing the sign from a shorter distance.
Measure the Available Shopfront Space
Before designing the sign, measure the usable area above or around your entrance.
Consider:
- Total shopfront width
- Fascia height
- Windows and doors
- Existing signs
- Architectural features
- neighbouring tenancy signs
- Installation access
Your illuminated sign should feel like part of the building rather than being squeezed into the available space. A long business name may need smaller letters or a wider layout, while a short brand name can often use larger individual letters.
Don't Forget About Letter Height
Many business owners focus on the total sign size, but letter height is one of the most important factors for visibility.
Compare:
COFFEE HOUSE
with:
The Original Artisan Coffee House & Specialty Roastery
The second message requires much more space. For shopfront signage, keeping the message simple usually improves visibility.
Where possible, prioritise:
- Business name
- Logo
- Short descriptor if necessary
Avoid trying to put your entire list of products or services into the main illuminated sign.
Font Choice Changes the Size You Need
Two signs with the same letter height can have very different readability. Bold, clean fonts can generally be recognised from farther away than:
- Thin fonts
- Decorative scripts
- Highly condensed lettering
- Complex handwritten styles
If your existing logo uses fine or detailed lettering, the sign may need to be larger to remain clear from a distance. This does not mean changing your brand. A signage designer can adjust spacing, construction and illumination while keeping the overall identity consistent.
Contrast Matters as Much as Size
A large sign can still be difficult to read if the colours have poor contrast.
Strong combinations might include:
- White letters on black
- Bright letters against dark cladding
- Dark letters with halo illumination against a lighter wall
The surrounding building colour should therefore be considered when designing custom illuminated signage. A sign should work during both the day and night, not only when the LEDs are turned on.
How Does Illumination Affect Visibility?
Illumination helps a business remain visible after dark and in lower-light conditions. Colour Signs creates options including LED channel letters and backlit lightboxes for Adelaide shops, restaurants, offices and other commercial businesses. Different illuminated sign styles can create very different effects.
Front-Lit Letters
The face of each letter is illuminated, creating clear and direct visibility.
These can work well for:
- Retail stores
- Restaurants
- Shopping centres
- High-traffic locations
Halo-Lit or Backlit Letters
Light projects onto the wall behind the letters, producing a softer glow around the logo or lettering.
This style can create a premium appearance for:
- Offices
- Clinics
- Beauty businesses
- Restaurants
- Showrooms
Illuminated Lightboxes
A lightbox can display a larger logo, graphic or message within one illuminated panel. These can work well when the branding does not suit individual channel letters.
What Size Sign Is Best for a Small Shopfront?
A small shop does not necessarily need a small sign. If the frontage is narrow but faces a busy street, reasonably large and clear lettering may still be important.
For a smaller shopfront, consider:
- A short business name
- Clean LED lettering
- High contrast
- Minimal additional text
- Appropriate spacing around the logo
A well-proportioned sign can often create more impact than filling every available centimetre.
What About Restaurants and Cafés?
For restaurants and cafés, visibility after dark can be particularly important.
Your sign may need to be recognised from:
- Across the road
- Down the shopping strip
- A nearby intersection
- A car park
- The opposite side of a food precinct
Colour Signs has produced illuminated signage for restaurants and hospitality businesses as well as retail, dental, beauty and other commercial locations across Adelaide. For these businesses, the right sign size should balance visibility with the atmosphere and branding of the venue.
Does a Bigger Sign Always Mean Better Visibility?
No.
A larger sign can help, but readability depends on the complete design.
A well-designed smaller sign with:
- Clear lettering
- Strong contrast
- Good spacing
- Effective illumination
may be much easier to recognise than an oversized sign filled with too much information. The goal should be easy recognition, not simply maximum size.
What Information Should I Provide for a Sign Quote?
If you're planning a new illuminated business sign in Adelaide, having a few details ready can make the design and quotation process easier.
Useful information includes:
- Business name
- Logo or artwork
- Shopfront address
- Approximate shopfront width
- Photos of the building
- Desired installation position
- Preferred sign style
- Approximate viewing distance
- Indoor or outdoor installation
- Preferred lighting style
Colour Signs currently provides custom illuminated signage from its Welland location for businesses across Adelaide and South Australia.
Choosing the Right Illuminated Sign Size
There is no single perfect illuminated sign size for every shopfront.
The best size depends on:
Shopfront dimensions + viewing distance + traffic + letter style + contrast + installation height + illumination.
Before choosing a size based only on appearance, think about where customers will actually see the sign.
Can they recognise your business from across the road?
Can a driver understand the sign quickly?
Does it still look balanced when viewed close to the shop?
A custom signage design can help bring all of these factors together.
If you're planning illuminated signs in Adelaide, Colour Signs can help assess your shopfront, logo and visibility requirements to recommend suitable dimensions, materials and illumination options.
Explore our Illuminated Signs to see examples of LED letters, lightboxes and custom commercial signage.
Address and Booking Details
Store Address:
Unit 3/130 Frederick St, Welland SA 5007, Australia
Phone:
08 7080 5858
Email:
print@coloursigns.com.au
Opening Hours:
Monday to Friday, 9:00 AM – 5:00 PM
Booking / Quote Details:
For illuminated LED letters, customers can request a custom quote through the ColourSigns website. The process usually involves sharing project details, discussing design requirements, confirming artwork, dimensions, and installation needs, then approving the quote before production begins
Frequently Asked Questions
How big should the letters on my shop sign be?
It depends mainly on viewing distance. Larger distances and moving traffic generally require larger letters, while pedestrian-facing businesses can often use smaller lettering.
How do I know what size sign fits my shopfront?
Measure the available fascia or wall space and consider where customers will view the sign from. A signage designer can then scale your logo to suit the building.
Are illuminated letters better for visibility?
Illumination can improve visibility at night and in lower-light conditions, particularly for businesses operating into the evening.
Should my sign cover the entire shopfront?
Not necessarily. Leaving appropriate space around the sign can improve readability and make the design look more professional.
Can Colour Signs design the correct size for my shopfront?
Yes. Colour Signs provides custom signage design and production for Adelaide businesses, including illuminated LED letters and lightboxes tailored to the location and branding.