How to Measure Your Storefront and Choose a Letter Height
Key takeaways
- Measure the usable fascia width and depth, not the whole shopfront.
- Letter height comes from the viewing distance first, then gets adjusted to the available fascia.
- Photograph the shopfront straight on and from the far side of the road — both are needed.
- Note the surface material and where the nearest power supply is; both change the quote.
Most delays in a signage project come from missing measurements rather than from production. This guide is what we ask customers for: a handful of dimensions, three photos and two notes, which together are enough to quote accurately and avoid a second visit.
Related reading: storefront sign budget guide · custom storefront signage · signage design that reads from the street · send measurements for a quotation
What to measure
- Usable fascia width — between the shopfront edges or the available clear band
- Usable fascia height and depth, especially if there is a soffit or recess
- Distance from the pavement and from the far side of the road, for the viewing distance
- Height above ground where the sign will sit
- Position of the nearest power supply and how the cable can reach the sign
Setting the letter height
- Estimate the furthest point from which people need to read the sign
- Allow about 25 mm of letter height per metre of that distance
- Check the result against the fascia: leave 20–30% of the fascia height as clear space
- Round to a buildable size — normal English letters need to be over about 7 cm as illuminated channel letters
- If the letters come out too small to read, reduce the wording rather than the height
The photos to send
- Straight-on view of the shopfront, taken at eye level
- Wide view from the far side of the road, showing what the sign competes with
- Close-up of the fascia surface, so we can identify plaster, timber, aluminium panel or stone
- A view from the pavement to the left and right, if there is a projecting or double-sided sign option
- Any existing sign on the shopfront, for scale and for the removal or reuse question
With those measurements and photos we can confirm a construction, produce a drawing for approval and quote factory-direct. MOQ is one piece and standard production is 7–15 working days after approval.
Two numbers people forget
- Depth of the fascia or soffit: a shallow fascia may not accept deep channel letters and may need a light box instead
- Access for installation: scaffolding or a boom lift changes the project cost more than the sign does
Conclusion
Measure the usable fascia, set the letter height from the viewing distance, photograph the shopfront from both the pavement and the far side of the road, and note the surface material and the power position. That is the whole brief — and it is enough for a quotation you can trust.
Frequently asked questions
What is the minimum letter height for a readable storefront sign?
As a rule, allow about 25 mm of letter height per metre of viewing distance — roughly 7–10 cm as an absolute minimum for close viewing and 20–40 cm for a typical high-street shop seen from across the road.
How do I measure a fascia that is not straight?
Measure the narrowest usable band and send a photo showing the curve or step. We will advise whether the letters should follow the curve, sit on a rail, or be mounted on a sub-frame.
Can you quote from photos alone?
Yes, if the photos include something for scale — a door, a person or a standard sign. An approximate fascia width makes the quotation accurate; exact dimensions are confirmed at the drawing stage.
Sources and further reading
- Legibility — Wikipedia — Reading-distance research behind the sizing rules.
- Facade — Wikipedia — Building façade context for fascia signage.
- Letter spacing — Wikipedia — Spacing and readability background.
- International Sign Association (ISA) — Industry guidance on sign sizing and placement.
External links above point to independent reference material. We are not responsible for the content of external sites.
