Front-Lit Channel Letters: A Complete Materials List for Sign Shops
Every part that goes into a front-lit channel letter sign, from faces and returns to LEDs, power supplies and mounting, with simple ways to estimate quantities and the electrical points to check before you quote.
Tool for this: Sign Desk — White-label shop drawings, permit drawings and ADA layouts for sign companies, ready the next morning.
Most channel letter quotes that lose money do not go wrong on the big items. They go wrong on the parts nobody listed: the extra power supply, the wire, the raceway, the second trip. This guide lists everything inside a front-lit channel letter sign, so your estimate starts complete. Pair it with our step-by-step pricing checklist.
1. The letter itself
| Part | What it is | How to estimate |
|---|---|---|
| Face | Translucent acrylic, usually white (for example a 3/16" LED-grade white) | Face area of all letters, plus about 25–30% waste for nesting |
| Face vinyl | Translucent vinyl for colored faces | Same area as the faces |
| Trim cap | Holds the face to the return | Perimeter of every letter, plus waste |
| Returns | Aluminum coil forming the letter sides (5" deep is common) | Same length as the trim cap |
| Backs | Aluminum sheet for the letter backs | Letter area, plus waste |
A quick rule for the perimeter: measure it in your design software, not by eye. Script fonts and serifs can double the trim cap length compared with a block font of the same height.
2. Light and power
- LED modules. The count depends on letter height, stroke width and can depth. Use the LED maker's layout tool for the final number; a rough estimate is fine for a first quote.
- Power supplies. Add up the watts of all modules. Many LED and power supply makers advise loading a supply to no more than about 80% of its rating, so size up rather than down.
- Wire and connectors. Low-voltage wire between letters and to the power supply, plus connectors and wire nuts.
- Penetrations and seals. Grommets or bushings where wires pass through the backs and the wall.
3. Mounting
- Raceway: an extruded box behind the letters that holds the power supplies. Length is the sign width plus a little at each end. Paint it to match the wall.
- Flush mount: letters fixed directly to the wall, with power supplies inside the building or in a remote box. Lighter to ship, more holes in the wall.
- Backer panel: letters on an aluminum or ACM panel, useful when the landlord limits wall penetrations.
- Fasteners and anchors for the wall material you will meet on site: brick, block, EIFS or metal panel all need different hardware.
4. Electrical points to check before you quote
These are general points from NEC Article 600. Local codes and inspectors differ, so confirm with the authority having jurisdiction and a licensed electrician.
- Electric signs must be listed and installed according to their listing (600.3). Check which listing your fabricator or shop works under.
- Each sign circuit needs a disconnect that is within sight of the sign, or one that can be locked in the open position (600.6).
- Commercial buildings with pedestrian entrances need at least one sign outlet supplied by a dedicated 20 A branch circuit (600.5). Ask whether it exists before you price the install.
- Metal parts must be bonded to the equipment grounding conductor (600.7).
If the building has no sign circuit, the electrician's work can cost more than the letters. Put it in the quote as a separate line, or state clearly that it is by others.
5. The parts people forget
- Permit fees and the drawings that go with them (see our sign permit drawings checklist)
- Lift or boom truck rental
- Patterns or a paper template for the installers
- Paint for the raceway and touch-up
- A second site visit if the wall is not ready
Quote it without the spreadsheet
SignAcctPro, our sign shop software, counts these parts from the number of letters and the letter height, prices each one from your supplier lists, and shows where every price came from. It also adds shop and install labor, so the estimate is complete before it reaches the client. Need the shop drawing for the same job? Our Sign Desk prepares white-label drawings for sign companies. Related: What a Sign Shop Drawing Should Include.
Sources: NEC Article 600 overview, EC&M.