What Does a Structural Engineer Do?
By Koray Bozkurt, PE, PMP, BOZ Engineering Group. Last updated June 2026.
If you’ve ever stared at a crack in your basement wall or wondered whether that wall between your kitchen and living room can actually come down, you’ve bumped into a question a structural engineer answers for a living. A structural engineer figures out how a building carries its own weight, plus everything and everyone inside it, and safely pushes all of that load down into the ground. When homeowners in DC, Maryland, and Virginia plan an addition, buy an older rowhouse, or worry about foundation movement, a licensed Professional Engineer (PE) is the person who says yes, no, or “here’s how to make it safe.”
This guide walks through what structural engineers actually assess and design, the paperwork they produce (stamped drawings, engineer’s letters, inspection reports), when it makes sense to hire one, and how their role differs from an architect’s or a general contractor’s. The goal is simple: help you understand who does what before you sign a contract or knock out a wall.
Key Takeaways
- A structural engineer analyzes and designs the parts of your home that carry load: foundations, beams, columns, and load paths, then stamps drawings that permit offices accept.
- About one-quarter of U.S. homes have suffered damage from expansive soils, and roughly half sit on soil that shrinks and swells with moisture (Virginia Energy, 2024), so structural evaluation isn’t a rare need.
- Structural engineers, architects, and general contractors play different roles. The engineer owns the math behind safety and the PE stamp.
- Hire one before removing a wall, adding a floor, buying an older home, or after visible cracking or settlement.
What does a structural engineer actually do?
A structural engineer makes sure a building won’t fall down, sag, crack, or fail under the loads it carries. That means calculating dead loads (the structure itself), live loads (people, furniture, snow), and lateral loads (wind, seismic), then designing framing and foundations to handle them. Civil engineers, the broader category that includes structural work, held about 368,900 jobs in 2024 (U.S. Bureau of Labor Statistics, 2024). For a homeowner, the day-to-day reality is simpler: this is the licensed professional who signs off that your project is safe.
The work splits into two big buckets, assessment and design. Assessment means looking at something that already exists, a cracked foundation, a bouncy floor, a bowing wall, and diagnosing whether it’s cosmetic or serious. Design means engineering something new or modified: a beam to replace a load-bearing wall, footings for an addition, or reinforcement for a rooftop deck. Both end in a document you can hand to a contractor or a county permit office.
What structural elements does an engineer assess and design?
Structural engineers focus on anything that carries or transfers load. That includes foundations and footings, load-bearing walls, beams and headers, columns and posts, floor and roof framing, and the overall load path that ties them together. Because expansive soils, which shrink and swell with moisture, sit under about half of U.S. homes and have damaged roughly a quarter of them (Virginia Energy, 2024), soil behavior is central to the job, especially in the clay-heavy soils common across parts of Virginia and Maryland.
Here’s what typically lands on an engineer’s desk:
- Foundations: slab, crawl space, and full basement systems, plus underpinning when soil moves. See our guide to signs of foundation problems.
- Load-bearing walls and beams: sizing the beam that replaces a wall you want to remove. Not sure which walls are structural? Read how to tell if a wall is load-bearing.
- Additions and second stories: confirming the existing structure can carry new weight, or designing what needs to change.
- Damage evaluation: cracks, settlement, water intrusion, fire, or impact.
How does an engineer trace a load path?
A load path is the route weight travels from your roof down to the soil. The engineer follows it beam by beam, wall by wall, footing by footing, to confirm every link can carry what’s above it. Because expansive and unstable soils cause an estimated $7 billion in structural damage each year, more than any other natural hazard (Virginia Energy, 2024), the bottom of that path, where structure meets ground, gets close attention. Break any link and the whole system is at risk.
What deliverables does a structural engineer produce?
The main deliverables are stamped drawings, engineer’s letters, and inspection reports. A stamped (or “sealed”) drawing carries the engineer’s PE license number and legally certifies the design meets code. Permit offices across DC, Maryland, and Virginia require that stamp for structural work, and with 88% of buyers ordering a home inspection before purchase (National Association of Realtors, 2024), structural findings surface constantly in real estate too, so these documents show up often.
The most common outputs:
- Stamped structural drawings: beam sizes, connection details, foundation plans. These get submitted for permits and handed to your contractor.
- Engineer’s letters: a signed opinion, often confirming a repair is adequate or a wall can be removed with a specified beam. Lenders, insurers, and buyers frequently ask for these.
- Inspection and evaluation reports: written findings after examining an existing condition, with recommendations.
- Repair specifications: step-by-step instructions a contractor follows.
Curious what all this costs? Our structural engineer cost guide breaks down typical fees for letters, inspections, and full designs.
Structural engineer vs. architect vs. general contractor
These three roles overlap on a job site, which is exactly why homeowners mix them up. The architect shapes space and looks. The structural engineer proves it stands up. The general contractor builds it. On a straightforward addition you may need all three, but on a wall removal you might only need an engineer and a contractor. Who does what?
| Role | Primary focus | Typical deliverable | Licensed to stamp structural plans? |
|---|---|---|---|
| Structural Engineer (PE) | Safety, loads, load paths, foundations, beams | Stamped drawings, engineer’s letter, inspection report | Yes |
| Architect | Layout, aesthetics, space planning, code for egress/light | Architectural drawings, renderings | No (not for structural calcs) |
| General Contractor | Building and coordinating the actual construction | Bids, schedules, finished work | No |
The short version: an architect can make your addition beautiful and a contractor can build it, but only a licensed PE can certify that the beams and footings carry the load. On many DMV projects the architect and engineer collaborate, with the engineer stamping the structural sheets inside the architect’s set.
Do I need an architect if I already have a structural engineer?
Not always. If you’re removing a load-bearing wall or reinforcing a floor, a structural engineer alone is usually enough. You’ll want an architect when you’re reshaping space, adding rooms, or need design drawings for a larger addition. Since the median renovation now runs around $20,000 (Houzz, 2026), matching the right professional to the job protects your budget.
When should a homeowner hire a structural engineer?
Hire a structural engineer whenever you’re changing, adding to, or worried about the parts of your home that carry weight. That covers removing walls, building additions, buying an older property, and responding to visible damage. With about one-quarter of U.S. homes having suffered damage from expansive, moisture-sensitive soils (Virginia Energy, 2024), and older homes more exposed to decades of soil movement, the aging rowhouses and bungalows across DC and inner Maryland make this a frequent call.
Clear triggers to pick up the phone:
- Removing or moving a load-bearing wall for an open-concept layout.
- Planning an addition or second story. Confirm the existing structure and foundation can take the load before you design. Our home addition cost guide covers budgeting.
- Buying an older home, especially if the inspection flags cracks or sloping floors. Pair it with a structural inspection before buying a house.
- Visible warning signs: stair-step cracks in brick, doors that won’t latch, sloping floors, bowing basement walls.
What are the warning signs that I need one now?
Call a structural engineer when cracks widen, floors slope, or doors and windows suddenly stick, these often signal foundation movement. Since moisture-driven soil movement is the leading cause of foundation trouble and drives an estimated $7 billion in structural damage a year (Virginia Energy, 2024), drainage issues near your foundation deserve a professional look before they escalate into structural damage.
How does hiring an engineer fit into a renovation budget?
Structural engineering is usually a small slice of overall project cost, but it’s the slice that protects the rest. U.S. renovation and repair spending is projected to hit a record $524 billion in early 2026 (Joint Center for Housing Studies, Harvard, 2026), and a big share of that goes toward additions and structural changes that legally require a stamped design. Skipping the engineer doesn’t save money, it just moves the risk onto you.
An engineer’s involvement also smooths permitting and resale. Unaddressed foundation and soil damage can weigh heavily on a home’s value, so a documented, engineered repair isn’t just a cost, it’s protection for one of your largest assets. And with 88% of buyers ordering an inspection before purchase (National Association of Realtors, 2024), that engineer’s letter you keep on file can make a future sale far easier.
Ready to get a professional read on your project? Book a structural assessment with our team.
Frequently Asked Questions
Is a structural engineer the same as a civil engineer?
Structural engineering is a specialty within civil engineering. All structural engineers work with structures, while civil engineering also covers roads, water systems, and site work. Civil engineers held about 368,900 jobs in 2024 (U.S. Bureau of Labor Statistics, 2024), with structural specialists forming a subset licensed to stamp building designs.
Do I really need a stamped drawing to remove a wall?
For a load-bearing wall, almost always yes. Permit offices in DC, Maryland, and Virginia require a licensed PE’s stamp on the beam design that replaces the wall. A structural engineer inspection runs about $555 on average, with most falling between $344 and $776 (HomeAdvisor, 2025), and that documentation also reassures future buyers your change was engineered correctly.
How much does a structural engineer cost for a home project?
Fees vary by scope, from a few hundred dollars for a short engineer’s letter to several thousand for a full addition design. With the median renovation around $20,000 (Houzz, 2026), engineering is a modest line item. Our structural engineer cost guide breaks down typical DMV pricing.
Can a general contractor tell me if a wall is load-bearing?
An experienced contractor can often guess, but only a structural engineer can certify it and design the replacement beam. Given that moisture-sensitive soils have already damaged about a quarter of U.S. homes (Virginia Energy, 2024), the calculations matter. For a primer, see how to tell if a wall is load-bearing.
Should I get a structural engineer before buying an older home?
If the inspection flags cracks, sloping floors, or settlement, yes. With roughly a quarter of U.S. homes already damaged by expansive soils (Virginia Energy, 2024), and older DMV homes especially prone to it, an evaluation is worth it. A focused review, paired with a structural inspection before buying a house, tells you what you’re really buying.
Koray Bozkurt, PE, PMP, is the founder and principal engineer of BOZ Engineering Group, a full-service firm licensed in DC, Maryland, Virginia, and Florida. He holds a master’s degree in geotechnical engineering and brings more than 18 years of structural design experience to residential and commercial projects across the DMV.
