Architects spend years learning structural principles as part of their training. Most can look at a floor plan and know instinctively where the load-bearing walls need to be, or size a beam close enough to the mark before an engineer ever runs the numbers. That's a real skill, and it's part of good architectural training.

But an architect and a licensed structural engineer cover different scopes of work. Both let the holder "stamp" plans, a formal declaration that a licensed professional is taking responsibility for the design being correct and safe. An architect's license covers structural work up to a point, typically simple, conventional construction like a standard wood-frame house. 

Once a project moves past that (i.e., removing a load-bearing wall, adding a second story, working in a high seismic or wind zone, using non-conventional framing) the work legally requires a structural engineer's license instead, because that scope falls outside what an architect's license allows them to stamp on their own.

Where Architectural Scope Ends and Structural Engineering Begins

Most states give architects some authority to handle basic structural work on straightforward residential projects, usually limited to conventional, prescriptive construction like a standard wood-frame home. Once a project moves past that baseline, the required license changes from architect to structural engineer, and the exact trigger point (such as project size, framing type, seismic exposure, local ordinance) depends on which state, and often which city, the project is located in.

The American Institute of Architecture's own state-by-state legal matrix has dozens of pages comparing how different states define this relationship. A structural engineer generally faces no ceiling on project type or complexity, while an architect's authority to handle structural work without one typically ends where conventional construction does. Checking these requirements before submitting for permit avoids a correction from the plan reviewer later.

When Does a Project Need a Licensed Structural Engineer?

There are a few instances when a licensed structural engineer is required:

• A load-bearing wall is coming out or moving. A load-bearing wall supports weight from the floor or roof above it. Removing or relocating one means that weight needs a new path down to the foundation.

• A second story, room addition, or new roof load is being added. New weight on an existing structure means the foundation and framing need to be checked against loads they weren't originally sized for, and the lateral system needs to be checked against wind and seismic forces it wasn't originally designed to resist.

• The site is located in a high seismic or high-wind zone. The International Building Code requires structural observation, meaning a licensed engineer has to physically confirm the building matches the approved design, for structures assigned to higher seismic design categories or facing design wind speeds above certain thresholds. That requirement applies based on a structure's seismic design category and wind exposure, not its size, height, or occupancy.

• The framing falls outside conventional, prescriptive limits. Engineered wood, steel elements, long spans, cantilevers, or unusual geometry can move a project past what standard framing tables cover.

• Foundations, retaining walls, or shoring are involved. Cities frequently set their own thresholds here. Seattle, for instance, requires a licensed structural engineer's stamp on shoring taller than a set height or braced by any tie-back system, treating shoring as part of the permanent structure it protects once conditions like that are met.

• The permitting jurisdiction sets its own valuation or scope threshold. Some municipalities require a licensed seal above a set construction cost regardless of scope. Lombard, Illinois, for example, requires signed and sealed drawings on any project valued above $10,000. 

When Should a Structural Engineer Join the Project?

Bringing in a structural engineer at the last minute, after the design is locked and the permit deadline is close, might mean reopening architectural drawings that were already treated as finished, sometimes more than once, as the structural engineer's requirements surface issues the architect didn't anticipate.

Coordinating early gives the structural engineer a chance to understand what the design is trying to achieve, so structural problems can get solved without undercutting it. It also lets the architect learn about structural constraints while the design is still flexible.

A Faster Path to a Licensed Structural Engineer

This is the coordination problem Spacial was built to solve. Instead of architects sourcing a structural engineer, an MEP consultant, and an energy consultant separately and managing the handoffs between all three, Spacial delivers coordinated structural, MEP, and energy engineering under one roof, with AI-assisted validation catching conflicts early and licensed engineers reviewing, resolving, and stamping the final set.

The AI does the repetitive work: running jurisdiction-specific code checks and flagging when a duct route and a structural beam are drawn through the same physical space, before a plan checker has to.

The engineering judgment and the final stamp stay with licensed professionals, which is the distinction that matters most to anyone signing off on the finished project. Spacial has delivered permit-ready structural engineering on more than 1,000 residential projects across more than 400 municipalities, with typical projects reaching permit-ready in 7 to 10 business days and average approval cycles running roughly 25 percent faster than the conventional consultant model.

Want to learn more? Contact us today.

Frequently Asked Questions

Can an architect design structural elements without a structural engineer?

Sometimes, within limits. Most states allow architects to handle conventional structural work on straightforward residential projects, but the moment framing, loading, or site conditions move outside conventional methods, a licensed structural engineer's stamp is typically required.

Does every home addition need a structural engineer?

Not automatically, but many do. Additions that add floor area, change roof loads, remove walls, or touch the foundation almost always cross into structural engineering territory, even when the original home didn't require it.

Who is responsible if a permit gets rejected over a structural issue?

Whoever stamped the affected portion of the plans is the one legally accountable for it. That's the core function of the stamp requirement: it ties a specific licensed professional to the structural decisions made on a project.

Does bringing in a structural engineer slow down an architect's timeline?

It doesn't have to. The delays most firms associate with structural engineering usually come from poor coordination between separate consultants, not from the engineering itself. A coordinated process, where structural, MEP, and energy engineering move together from the start, is built to avoid that lag entirely.

If your project is approaching one of these triggers, or you'd rather not find out the hard way that it already has, Spacial's team can help you figure out what your plans need before a plan checker tells you. Contact us today to get started.