An illuminated sign combines two purchases. One is the sign, built by a fabricator to a defined specification. The other is the power supplied by the building, which falls under the property and the licensed professional who works on its electrical system.
Buyers often settle the sign purchase months before anyone reviews the building-side power. That gap causes late surprises: there may be no circuit behind the wall, no spare capacity in the panel, no priced route for the supply, or no inspection on the schedule. These conditions are usually easier to address when identified early. Finding them after fabrication, with an installation crew already booked, can be costly.
The following questions are for planning only. Electrical work on a commercial building generally must be performed by a licensed electrician, and the requirement that applies at your address is set locally. The electrician's findings at the project address control the final requirements.
Three scopes that are easy to confuse: The word "lighting" can make several parts of an illuminated sign project sound like one scope. In practice, it often covers three different scopes.
The first is the work inside the sign: lighting components, power supplies, internal wiring, and the specification stating what the sign draws. The fabricator handles this work, and it travels with the sign.
The second is the building supply: the power source, circuit, capacity, conduit run, penetration through the building envelope, any required disconnect, and the final connection. A licensed electrician performs this work on the property according to the codes in force at the address.
The third is approval and verification, including applicable permits, inspections, and the documents required for each.
A quote may include one, two, or all three scopes. It may also refer to them without assigning responsibility. Before comparing totals, ask which scope each line item covers. A lower quote may simply end before the building-side work begins.
What to gather before the conversation
Most of the initial information can be recorded from the ground without opening or touching electrical equipment.
- Note whether an illuminated sign was previously installed at that location and whether its circuit is believed to still work.
- Identify the electrical panel that serves the space and whether the tenant or property controls it.
- From the ground, record any visible junction box, conduit stub, or switch near the proposed sign location.
- Identify what is directly inside the wall behind the proposed sign position, such as tenant space, a stairwell, a mechanical room, or a shared corridor.
- Decide how the sign should be switched: by timer, daylight sensor, manual control, or a building system.
- Record the hours when the sign should be illuminated, including whether it will remain on after closing.
- Review the lease terms for electrical modifications, metering, and responsibility for the sign's power consumption.
- Gather any previous sign permits, electrical permits, or vendor records that the property retains.
- Take photographs of the proposed sign position, the wall, and any existing electrical provision visible nearby.
Do not open a sign, remove a cover, test breakers to trace a circuit, or work at height to inspect anything. Illuminated signs contain energized components, and building circuits should not be investigated informally. An unknown condition is useful information when it is labeled accurately.
What the sign provider should put in writing
Request the sign's electrical specification as a document, not a brief description in an email. The electrician needs technical details, not only a description of the sign's appearance.
- the operating voltage for which the sign is built
- the total current draw and connected load for the completed sign, along with the figures for each section if the sign is divided or double faced
- the number of power supplies, their locations, and the sections each one serves
- whether the power supplies are inside the sign, inside a raceway, or intended for remote mounting
- where the sign is designed to receive its feed and what the connection requires
- whether the components and enclosure are specified for exterior use under the site's conditions
- the listing or certification carried by the completed sign, or whether a field label is expected
- what the internal wiring includes and where the provider's responsibility ends
- what access and replacement work would be required if a component fails later
The last point is easier to resolve before fabrication. A layout may be quick to build but difficult to service. If access is poor, the cost of reaching a failed component can return each time service is needed.
Source, circuit, routing, and access
Once the sign specification exists, the building side of the project turns into two linked questions: where the power comes from, and how it gets to the sign. A licensed electrician should answer both using that specification rather than a description of the sign.
Start with the source. Is there suitable power at or near the proposed sign position? Does the sign require a dedicated circuit, and does the panel have an available position? Can the existing electrical service handle the added load when the rest of the space and any planned additions are considered? If capacity is insufficient, does the alternative require a new circuit, a panel change, or a larger upgrade?
Ask who makes each determination, whether the electrician needs a site visit, and whether that visit is priced separately. Also ask how the answer changes if the previous sign was smaller, unlit, or illuminated differently. Reusing an existing circuit may reduce work, but it is appropriate only after a qualified party confirms that the circuit suits the new load and satisfies the code in force at the address.
The route from that source to the sign then affects cost, appearance, and the wall's long-term condition.
Concealed routing usually has a cleaner appearance but requires more invasive work. Surface-mounted conduit is less invasive, yet remains visible. That can matter when a landlord has approved the storefront's appearance. Wall construction also limits the available options. Brick, block, metal panel, synthetic finish systems, veneers, and curtain walls behave differently, and the penetration through each type needs a suitable sealing detail.
Resolve the following points before finalizing the design:
- where the supply enters the building envelope and who seals the penetration
- whether the route is concealed or surface mounted, and whether the property has approved the visible result
- whether a raceway is part of the sign and whether it will carry wiring and power supplies
- how penetrations left by an existing sign will be handled
- how a technician will reach junction boxes, disconnects, and power supplies for future service
- whether the route crosses another tenant's space, a fire-rated assembly, or a shared corridor, which may change who must approve the work
Controls, switching, and shutoff
Choose how the sign will turn on and off before the electrician plans the circuit. The control method changes what needs to be installed.
A timer follows a schedule and must be adjusted when operating hours or seasons change. A daylight sensor responds to ambient light and needs a position where nearby lighting will not interfere with it. A manual switch is simple but relies on someone operating it. A building management system may provide scheduling and remote control when the property already has one. For any option, ask where the control device will be located, who can access it, and who will adjust it later.
Shutoff is a separate question. Many jurisdictions require an accessible means of disconnecting an exterior illuminated sign. Signs and outline lighting are addressed in NFPA 70, the National Electrical Code, which many jurisdictions adopt and then amend locally. The code actually in force at the address determines whether a disconnect is required, where it must be located, and how it must be labeled, so treat the published standard as background and the local adoption as the answer. Confirm the requirement for the project, who supplies the disconnect, and where it will be installed. Grounding and bonding, along with the listing or field labeling the inspector expects to see, are determinations for the electrician and the inspecting authority rather than preferences to choose during design.
Permits, inspections, and timing: Sign and electrical permits are often separate submissions. Different parties may pull them, and each may follow its own review schedule. Because requirements vary by municipality, zone, and property, begin by assigning responsibility for determining and completing the required steps.
Ask who identifies the applicable permits, prepares the electrical documents, files the applications, pays the fees, and responds to review comments. Confirm who schedules and attends each inspection. Some jurisdictions require an inspection before the wall is closed, which changes the work sequence as well as the cost. Also ask which documents the inspector expects for the sign, including its listing or labeling.
Map those steps to the project schedule. Estimated review times are planning inputs, not committed dates. Do not release production based on an approval that has not been granted.
Who normally confirms what
Responsibility depends on the property, lease, jurisdiction, and each provider's written scope. Assign every item rather than assuming another party has it covered.
| Item | What has to be confirmed | Party normally positioned to confirm it |
|---|---|---|
| Sign electrical specification | Voltage, load, power supplies, and internal wiring for this sign | Sign provider and fabricator |
| Listing and labeling | What certification the finished sign carries or requires | Fabricator, verified at inspection |
| Power source | Whether usable power exists at or near the sign position | Licensed electrician |
| Circuit and capacity | Whether a dedicated circuit is needed and whether the panel supports it | Licensed electrician |
| Service capacity | Whether the existing service accommodates the added load | Licensed electrician |
| Routing | The conduit path, its appearance, and whether the property accepts it | Electrician, with property approval |
| Penetration and sealing | Where the supply enters and how the opening is sealed | Electrician and installer, coordinated with the provider |
| Controls | Timer, sensor, manual, or building system, and who adjusts it later | Buyer, installed by the electrician |
| Disconnect and grounding | What the code in force requires and where it is placed | Licensed electrician |
| Final connection | Who energizes the sign and when | Licensed electrician |
| Electrical permit | Whether one applies, who files, and who pays | Municipality, through the named filing party |
| Inspection | Which inspections apply and who schedules and attends them | Municipality, electrician, and provider |
| Metering and consumption | Which meter serves the sign and who pays for it | Landlord or property manager, with the tenant |
| Service access | How components are reached for later repair or replacement | Provider, installer, and property |
| Post-installation check | Who reviews the sign after dark and how a fault is reported | Buyer, property, and provider |
Nothing in the table hands work to Signage.com or to any other provider. It sets out the confirmations an illuminated sign project tends to need and the party usually placed to give each one, for a specific sign at a specific address.
Compare quotes on the same electrical scope: Ask every provider to identify each item as included, excluded, or covered by a separate contract:
- the site visit and any electrical evaluation included with it
- the sign's internal components, power supplies, and wiring
- the electrical specification document and any drawings required by the inspector
- the conduit route from the source to the sign
- the penetration, sealing, and wall repair required by that route
- the disconnect, controls, sensor, or timer
- the final connection and energizing
- electrical permit research, filing, fees, and responses to review comments
- attendance at inspections and any resulting corrections
- removal and disconnection of an existing illuminated sign
- the written warranty for illuminated components, including its term, coverage, and exclusions
- every assumption used to calculate the total
Review the exclusions before comparing totals. If one quote includes building-side electrical work and another excludes it, they describe different project scopes. The quoted totals alone will not show which option costs less overall.
Before approving anything for production
Put the illumination expectation in writing for every lit section. Include how the new sign should look after dark beside any sign that will remain. Confirm that the specification shown in the drawing matches the specification in the quote. Assign someone to inspect the completed sign after dark and document how a dark or uneven section will be reported.
Know which document you are signing off on. A visual mockup is a way to look at layout, scale, placement, and visual direction while those things can still change. It is not a final proof, engineering drawing, permit set, structural or electrical document, fabrication file, installation plan, code document, or promise of installed appearance.
What is required for an illuminated sign depends on the property, the municipality, and the scope of the specific project. Read this article as planning guidance, and have qualified parties confirm the final requirements before production or installation.
Reviewing channel letter and illuminated sign options can help you describe the sign construction and illumination approach you have in mind. It does not establish the power source, circuit capacity, routing, permitting, or connection requirements for your address.
Next step: Gather the sign position and wall details, available information about existing power and the electrical panel, the desired illuminated hours and control method, the lease terms for electrical work, and the artwork. Then take the quote-preparation next step with Signage.com and include those materials. State which electrical details are confirmed and which remain unknown. Clearly labeled unknowns help the provider scope the sign and give the electrician something specific to evaluate and price.
