Construction Signage 101: A General Contractor's Guide to Getting Signs Right

When Should a General Contractor Start Planning Signage?

Signage should enter your construction timeline during the design development phase, typically 12 to 16 weeks before the planned certificate of occupancy date. Late sign planning is the single most common cause of CO delays related to signage, and building officials will not issue a CO without required code-compliant signs in place. This guide covers what general contractors need to know to keep signage from holding up your project.

The Construction Signage Timeline

Most GCs treat signage as a finish-out item. That is a mistake. Sign fabrication, permitting, and electrical coordination all require lead time. Here is a realistic timeline:

Starting the sign conversation at week 6 before CO, as many GCs do, virtually guarantees a delay. A set of channel letters alone needs 3 to 4 weeks for fabrication after approved shop drawings, and that is before permitting.

Code-Required Signs You Cannot Skip

These are the signs that building inspectors will look for before issuing a certificate of occupancy. Missing any of them is a failed inspection.

ADA-Compliant Signs (IBC Section 1011, ADA Standards 703)

The Americans with Disabilities Act and the International Building Code require tactile and Braille signage at specific locations:

• Room identification signs at every permanent room or space (offices, restrooms, stairwells, exits)
• Tactile characters must be raised 1/32 inch minimum, between 5/8 inch and 2 inches tall, sans-serif, uppercase
• Grade 2 Braille positioned 3/8 inch minimum below the lowest tactile character
• Mounting height between 48 and 60 inches above the finished floor, measured to the center of the sign
• Mounting location on the latch side of the door, 18 inches minimum from the door frame (in Minnesota, many jurisdictions enforce a strict 6-inch offset from the frame edge)

A typical 50,000-square-foot office building requires 80 to 120 ADA room signs. At $25 to $45 per sign (depending on complexity and color matching), that is a $2,000 to $5,400 line item that GCs frequently underestimate.

Exit Signs (IBC Section 1013)

• Required at every exit and exit access door
• Must be illuminated at all times (internally illuminated or externally with minimum 5 foot-candles)
• Minimum letter height of 6 inches with 3/4-inch stroke width
• Visible from the exit access corridor at a maximum spacing of 100 feet between signs
• A 30,000-square-foot single-story commercial building typically needs 12 to 20 exit signs

Fire Code Signage

The International Fire Code and local amendments require:

• Fire extinguisher signs above each extinguisher location (IFC 906)
• Fire department connection (FDC) signs identifying the sprinkler and standpipe connections
• Fire pump room identification and equipment signage
• Stairwell identification signs (floor level, roof access, re-entry information) per IBC 1023.9
• Fire alarm control panel identification
• Elevator lobby signs indicating floors served and fire service operation

Fire code signage is often overlooked because it falls between the GC, the fire protection subcontractor, and the sign contractor. Assign clear responsibility early.

Address Numbers

The International Fire Code Section 505.1 requires address numbers visible from the street, with minimum 4-inch height for residential and typically 8- to 12-inch height for commercial (varies by jurisdiction). Many Minneapolis and St. Paul inspectors enforce specific requirements on contrast and placement height.

The Submittal Process for Signs

Sign submittals follow the same general process as other construction submittals, but GCs who are unfamiliar with sign-specific details often reject or delay them unnecessarily.

What a Sign Submittal Package Includes

1. Shop drawings showing letter styles, dimensions, colors, and materials

2. Location plans indicating sign placement on building elevations

3. Electrical details including power supply locations, circuit requirements, and conduit routing

4. Material specifications and finish samples (PMS or RAL color callouts)

5. Engineering calculations for wind load (typically designed to 90-110 mph depending on jurisdiction)

6. UL listing documentation for all illuminated signs

Common Submittal Mistakes

• Rejecting submittals because the sign contractor used their standard detail sheet instead of the architect's preferred format
• Not routing submittals to the electrical subcontractor for power coordination
• Failing to verify that the sign contractor is UL-listed (required by most building codes for illuminated signs)
• Not confirming sign locations against structural backing and blocking plans

Electrical Coordination for Signs

Illuminated signs need dedicated circuits. This coordination must happen during the electrical rough-in phase, not after drywall is up.

Typical electrical requirements by sign type:

Every illuminated sign needs a disconnect switch within sight of the sign or a lockable disconnect at the circuit panel. This is an NEC requirement (Article 600.6) that inspectors check specifically.

Top 5 CO Inspection Failures Related to Signage

Based on our experience fabricating signs for commercial construction projects across the Twin Cities metro, these are the most frequent inspection failures:

1. Missing ADA room signs. The most common failure by far. Inspectors will count signs against the door schedule. If 3 out of 85 signs are missing, you fail.

2. ADA signs mounted at wrong height or location. Signs must be between 48 and 60 inches AFF to center, on the latch side. We see GC crews mount them on the hinge side or at eye level (approximately 66 inches) regularly.

3. No electrical disconnect for illuminated signs. The disconnect must be installed and accessible before the sign can pass inspection. Many electricians forget this for exterior wall signs.

4. Stairwell signs missing or incomplete. IBC 1023.9 requires floor level identification, roof access information, and re-entry floor designations in every stairwell at every floor. These signs must have tactile characters and Braille.

5. Exit signs not connected to emergency power. Exit signs must remain illuminated during power loss, connected to the emergency circuit or battery backup. Testing is part of the inspection.

How to Avoid Signage Delays

The fix is straightforward: treat signage as a scheduled trade, not an afterthought.

• Include signage in the preconstruction meeting. Identify the sign contractor and establish the submittal timeline.
• Add sign milestones to the project schedule. Submittal due date, permit application date, fabrication start, rough-in coordination, and installation.
• Coordinate backing and blocking early. Interior ADA signs need solid backing at specific heights. Exterior signs may need structural steel or concrete embed plates.
• Assign fire code signage responsibility clearly. Do not assume the fire protection sub or the sign contractor will each handle their portion without coordination.
• Build in 2 weeks of buffer. Sign permits, fabrication, and weather-dependent installation all carry schedule risk.

Let Dimension Sign Handle Your Construction Signage

Dimension Sign works with general contractors and sign companies throughout the Minneapolis-St. Paul metro on commercial construction signage packages — recent multifamily projects include Vista 44 and Applewood Pointe. We fabricate ADA-compliant room signs, illuminated building identification, wayfinding systems, and code-required signage. We understand the construction timeline and can meet tight CO deadlines when given adequate lead time.

Contact us about your construction project signage and a fabricator will reply within one business day, with a line-item scope and quote in 24–48 hours.