Architect vs Structural Engineer: When Do You Need Each?

An architect designs the spaces, layouts, and aesthetic of a building. A structural engineer designs the framing, foundations, and load paths that hold it up. Most permitted projects need both. Small load-bearing modifications often need only the engineer. Full new construction always needs both. The roles and costs separate cleanly once you know what each one delivers.

What an architect actually does

An architect's deliverable is the building you'll live in or work in. Specifically:

Floor plans, room sizes, window and door placement, traffic flow
Elevations (what the building looks like from each side)
Materials, finishes, exterior treatments
Compliance with zoning, setbacks, height limits, occupancy classifications
Code compliance for life safety: egress, accessibility, fire ratings
The aesthetic decisions that determine whether the building feels good to be in

Architects in Utah are licensed by the Utah Division of Professional Licensing and required for most commercial work and any project where the architect-stamp requirement is triggered by the building code. Single-family residential often doesn't legally require an architect, but most owners working on additions or new construction hire one anyway.

What a structural engineer actually does

A structural engineer's deliverable is the framing system that holds the building up. Specifically:

Foundation design (footing size, depth, reinforcement)
Floor and roof framing sizing (joists, beams, headers)
Lateral force resistance (how wind and seismic loads transfer to the foundation)
Beam, post, and connection design where loads concentrate
Load path verification from roof to footing
PE-stamped drawings the building department accepts for permit
Load calculations that prove every piece is sized correctly

We're licensed by each state's professional engineering board. Ballpark Engineering holds active PE licenses in Utah, Idaho, Wyoming, Colorado, Nevada, Arizona, and Montana. The PE stamp on a drawing is a legal certification that the design meets code.

When you need both

If your project is new construction of anything bigger than a shed, you need both. The architect lays out the spaces and the structural engineer designs the bones. Most architects we work with bring the structural engineer in during schematic design, before drawings get too detailed to change without rework.

If you're doing a substantial addition or full remodel, you usually need both. The architect handles the spatial design and code compliance for the new layout. The structural engineer handles any load-path changes, beam sizing for wall removals, foundation modifications, and the connection between new and existing structure.

If you're doing commercial work, you almost always need both. Plus often a civil engineer for site grading, an MEP engineer for mechanical systems, and a geotech for soil. Architects coordinate that team.

When you need only a structural engineer

A few common cases where the engineer goes solo:

Removing a single load-bearing wall. No layout redesign, no architectural drawings required by code. The structural engineer designs the replacement beam and posts and stamps the drawing for permit.
Foundation repairs, underpinning, or basement structural work. Engineer-led entirely.
Crack monitoring, foundation assessments, expert witness work. Pure engineering scope, no architectural component.
PE stamp on existing plans. Someone already drew the building. The engineer reviews the structural elements and stamps the drawings for permit.
Tilt-up panel design for warehouses. The architectural scope is minimal; the engineering is the deliverable.

In each of these, the architect isn't adding value because there's nothing architectural to design. Trying to involve one wastes time and money.

When you need only an architect

Rare in our world, but it happens. Cases include:

Pure interior finish work with no structural modifications. No wall removals, no foundation work, no beam changes. Just paint, flooring, fixtures, finishes.
Zoning variance applications where the deliverable is plans for the planning department, not the building department.

The moment a load-bearing wall or foundation gets touched, the engineer enters the picture.

What each one costs

Real ranges in our 7-state footprint as of 2026:

Service: New custom home (3,000-5,000 sf) • Architect: $25,000 to $80,000 • Structural engineer: $4,000 to $12,000

Service: Substantial addition (1,000-2,000 sf) • Architect: $8,000 to $25,000 • Structural engineer: $2,000 to $5,000

Service: Load-bearing wall removal • Architect: (not needed) • Structural engineer: $800 to $1,500

Service: Foundation inspection / site visit • Architect: (not needed) • Structural engineer: $450 to $750 (Express)

Service: ADU complete (detached) • Architect: $5,000 to $15,000 • Structural engineer: $2,500 to $3,500

Service: Small commercial (5,000-10,000 sf) • Architect: $50,000 to $150,000 • Structural engineer: $10,000 to $30,000

These are honest market ranges, not floors or ceilings. Local market, project complexity, and existing-conditions discovery all move the numbers.

How to hire each one

For an architect, look at portfolios first. The aesthetic decisions they made on past projects predict what they'll make on yours. References from clients with similar project type matter more than years in business.

For a structural engineer, look at three things: active PE license in your project's state, reasonable turnaround, and willingness to talk to your contractor directly. The drawings have to be permit-ready and the engineer has to be available when the contractor calls from the jobsite at noon on a Tuesday with a framing question. If they're not, the engineering job isn't done.

What to do next

If your project includes structural work — load-bearing modifications, new framing, foundation changes, an addition, or new construction — book a structural site visit. A licensed PE walks the property, scopes the structural deliverable, and tells you whether you also need an architect or not.

Schedule a site visit

If you're an architect looking for an engineering partner who picks up the phone and hits deadlines, see our Engineering for Architects page.