Sign Structural Engineering and Sign Foundation Design
Pylon, monument and wall sign structures engineered for wind, with footings and attachments sealed by a licensed PE for permit.
- Stamped by a PE licensed in your state
- Built to IBC, IRC and local amendments
- Plan-check comments answered
Sign structural engineering that gets your sign permit approved
A sign looks simple from the street, but structurally it is a large flat sail on a narrow post. Wind pushes on the face, the column bends, and the footing has to keep the whole assembly from overturning. That is why most cities require sign structural engineering for pylon signs, pole signs, larger monument signs and heavy wall-mounted cabinets before they will issue a sign permit.
PE Engineer designs the structure behind the sign: steel columns and pipe supports, the internal frame, base plates and anchor rods, drilled pier or spread footings, and the connection of wall signs and blade signs to the building. Wind loads are determined from ASCE 7 for your exact location and exposure, and every set is sealed by a Professional Engineer licensed in the state where the sign will stand.
We work with sign fabricators, installers, general contractors and business owners. Send the shop drawing or a dimensioned sketch of the cabinet, and we return stamped structural drawings and calculations ready to attach to the sign permit application. You receive a fixed-fee proposal first, usually the same day, and rush service is available when an opening date is set.
What you receive
- Sign elevation with structural dimensions
- Column, frame and base plate design
- Footing or drilled pier design
- Anchor rod and attachment details
- Wind load and overturning calculations
- PE stamped PDF set ready to submit
Sign types we engineer
We engineer the structure for most permanent sign types, from small monuments to tall highway-oriented pylons.
Pylon and pole signs
Single and double column signs on steel pipe or tube columns, with drilled pier footings sized for overturning, soil bearing and the lateral capacity of the embedment.
Monument signs
Low ground signs on masonry, concrete or framed bases, with spread footings or grade beams sized for wind and the weight of stone or masonry cladding.
Wall and fascia signs
Channel letters, raceways and cabinets attached to concrete, masonry, steel stud or wood walls, with fastener design and a check of the supporting wall.
Projecting and blade signs
Signs cantilevered from a building face, where the bracket, through-bolts and wall framing must resist bending, shear and wind on both sides of the sign.
Roof and canopy signs
Signs mounted on roofs, canopies and fuel station canopies, including a check of the supporting framing and the added wind load it must carry.
Electronic message centers
LED displays and digital boards added to new or existing structures, accounting for the extra weight and the larger solid face area.
Your Stamped, Permit-Ready Plans Start With One Upload
Send your drawings or describe the project. A licensed engineer reviews it and sends a clear, fixed-fee proposal, often within hours.
- Free and no obligation
- Reviewed by a licensed PE
- Secure file upload
Why signs need structural engineering
Wind load on a sign grows with the area of the face and the square of the wind speed, and it acts high above the ground. A tall pylon sign can generate a large overturning moment at its base even in a moderate wind region. In hurricane coastal areas and open exposures the numbers climb quickly.
Building departments typically ask for sign structural engineering when:
- The sign is freestanding above a height set by the local sign code or building code.
- The face area is large, or the sign is internally illuminated and heavy.
- A wall sign or projecting sign hangs from an existing building whose wall capacity is unknown.
- An existing sign structure is being reused with a new, larger or heavier cabinet.
- The site is in a high wind region or a special wind zone defined by the jurisdiction.
Local sign ordinances, which control size, height, setback and lighting, are separate from the structural review. Zoning approval of the sign does not replace the engineering the building official asks for, and many jurisdictions route the two reviews to different desks.
A failed sign falls onto parking lots, sidewalks and roads, so reviewers take these calculations seriously. A clear, complete engineering package moves through review without repeated corrections.
How we calculate wind load and design the support
We start with the basic wind speed and risk category for your site from ASCE 7 hazard data, then assign the exposure category based on the surrounding terrain. Open highway frontage is treated differently from a sign surrounded by buildings. ASCE 7 includes specific force coefficients for solid freestanding signs that depend on the sign’s aspect ratio, clearance to the ground and whether the wind strikes it at an angle, and we apply the governing cases.
Those forces become shear and moment at every level of the structure. We size the steel columns and frame to AISC 360, check combined bending and axial stress, and design the base plate and anchor rods for tension, shear and concrete breakout using ACI 318. Welded connections are specified with sizes and electrodes the fabricator can follow.
For the footing we check overturning, sliding, soil bearing and, for drilled piers, lateral soil resistance using the IBC methods for embedded posts and poles or the recommendations of a geotechnical report when one is available. The result is a foundation sized to the actual load, not a rule of thumb. Where utilities, property lines or an existing slab limit the footing size, we can trade a wider spread footing for a deeper pier, or the reverse, to fit the site.
Have a Question? Get a Real Engineer's Answer in Minutes
Skip the guesswork. Chat live with a licensed engineer about your drawings, code requirements or permit comments, free and with no obligation.
- Free and no obligation
- Reviewed by a licensed PE
- Secure file upload
Wall signs and existing sign structures
A wall sign transfers its weight and wind load into the building. Channel letters on a masonry wall are usually straightforward, but a large cabinet on a steel stud parapet or an old wood-framed storefront needs a closer look. We design the fasteners, check the supporting wall or parapet, and add blocking, backing plates or new framing where the existing wall is not strong enough.
Existing pylon structures are another common request. A new tenant wants to reuse the old pole and footing but install a larger or heavier cabinet, or add an electronic message center. We evaluate the existing column and foundation against the new loads, using available drawings, field measurements and photos, and either confirm the structure in an engineering letter or design the reinforcement it needs.
Corrosion at the base of old steel poles is a frequent concern, so we ask for close-up photos of the column where it meets the footing.
When a site visit is needed to measure or examine an existing sign, we can arrange one through a local licensed engineer.
Blade signs on older downtown buildings deserve particular care. Brick walls and historic facades may have limited capacity near the parapet, so we often recommend through-bolts with backing plates or anchorage into the floor framing instead of shallow anchors in old masonry.
What we need for sign structural engineering
To prepare a fixed-fee proposal and design, send us:
- The site address, so we can determine wind speed, exposure and the state license required.
- The sign shop drawing or a sketch with overall height, face dimensions, cabinet depth and approximate weight.
- The proposed location on the site plan, with clearance to property lines, utilities and any slope.
- For wall and projecting signs, photos of the wall and any information on its construction.
- Any soils report for the site, if one exists.
- The sign permit checklist or any comments the city has already issued.
If you are a fabricator with several signs moving at once, tell us. We can set up a consistent drawing format so each new sign follows the same layout and reviewers in your area see a familiar package every time.
Many sign permits also need a site plan showing the sign location and setbacks. Our site plan service can provide that sheet alongside the structural set. For signs mounted on a new canopy, see our carport and canopy engineering.
Plan-check comments on the structure are answered and the drawings revised within the original scope at no extra charge.
You likely need this if
- The city requires engineering for your sign permit
- Your sign is a tall pylon or pole sign
- A heavy cabinet mounts to an existing wall
- You are reusing an old sign structure
- You are adding an LED message center
- The site is in a high wind region
How it works, start to finish
From your first message to stamped drawings, you work directly with the engineering team.
- 1Share your projectSend the address, scope and any drawings, photos or plan-check comments. Two minutes is enough.
- 2Receive a fixed-fee proposalAn engineer reviews the scope and replies with a firm price and delivery date for your sign structure engineering drawings.
- 3Engineering and draftingWe run the calculations and prepare drawings to the codes your jurisdiction enforces, checked before sealing.
- 4Stamped set deliveredYou receive a sealed PDF set ready to submit, and we answer any plan-check comments within scope.
Codes and standards we design to
Sign structures are designed to the editions your jurisdiction has adopted, including local sign ordinances and amendments:
- International Building Code (IBC), including its sign provisions where adopted
- ASCE 7 wind provisions for solid freestanding signs and walls
- AISC 360 for steel columns, frames and connections
- ACI 318 for footings and anchor rods in concrete
- AWS D1.1 for structural welding
- State codes such as the Florida Building Code and California Building Code
How licensing works. Engineering drawings must be sealed by a Professional Engineer licensed in the state where your project is located. PE Engineer works with a network of state-licensed PEs, so every set is reviewed and stamped by an engineer with an active license in the state where your project is located. Their name and license number appear on the seal, exactly as your building department requires.
Related services
Steel Structure DesignSteel beams, columns, moment frames, braced frames and connections designed to AISC standards and stamped for residential, commercial and industrial permits.Explore More
Foundation DesignFootings, slabs, stem walls, piers and pile foundations designed and PE stamped for your soil, loads and local code.Explore More
Third-Party Plan Review & StampAlready have drawings? A licensed PE reviews them in full, fixes what falls short and seals the set for your building department.Explore MoreFrequently asked questions
Do I need an engineer for a monument sign?
It depends on the size and the jurisdiction. Small, low monument signs are sometimes approved without engineering, but many cities require stamped drawings once a sign passes a certain height or face area, or when it has a heavy masonry base. Check your sign permit checklist, or send it to us and we will confirm what is required.
Can you engineer a sign that my shop is fabricating?
Yes. Send the shop drawing and we design the columns, frame connections, base plate, anchor rods and footing to match it, then seal the drawings and calculations for the permit. We match the drawing format to your shop’s sheet layout when you prefer.
What wind speed do you use for sign design?
We use the ASCE 7 basic wind speed for your exact site and risk category, along with the exposure category for the surrounding terrain and any local special wind region. Some jurisdictions set a minimum design wind speed, and we design to whichever value governs.
Can you check an existing pylon sign for a new, larger cabinet?
Yes. We evaluate the existing columns and footing against the new loads using drawings, measurements and photos. If the structure works, we provide a stamped letter or drawing confirming it. If it does not, we design reinforcement or a new foundation. A new electronic message center often triggers this review because of its weight.
Do you need a soils report for a sign footing?
Usually not. Many sign footings can be designed using the presumptive soil values the building code allows. A geotechnical report may be required for very tall signs, poor or unknown soils, or when the jurisdiction asks for one. If you have a report, we design to its recommendations.
Do you handle the electrical side of the sign?
Our sign work covers the structure. Illuminated signs are normally built and labeled by the sign manufacturer as listed electrical assemblies. If your project also needs a new circuit or service work, our electrical engineering team can provide a separate electrical plan. Most electrical sign permits are handled by the sign contractor.
Get your free sign structure engineering proposal
Tell us where the project is and what you need. Attach any drawings, photos or plan-check comments. A licensed engineer reviews every request.
- Upload your filesPlans, sketches, photos or comments
- Get a fixed-fee proposalUsually the same day
- Receive stamped drawingsSealed by a PE licensed in your state