The Carolinas are three distinct structural engineering markets sharing two state building codes and a lot of geography. Charlotte’s high-growth commercial development, Raleigh-Durham’s research and university construction, and Charleston’s coastal historic preservation each pose different challenges. Understanding how structural engineering works in each city — and across the Carolinas as a whole — is essential if you’re planning a project anywhere in the region.
This guide covers the North Carolina and South Carolina building code environments, the soil and climate conditions that shape structural design, the most common project types in each major market, and what property owners, developers, and general contractors should look for in a Carolinas-licensed PE firm. If you’re planning work in Charlotte, Raleigh, Charleston, or any of the surrounding metros, this is your orientation.
Three cities dominate our Carolinas practice, and each has its own character:
Each city operates under its state building code — North Carolina for Charlotte and Raleigh, South Carolina for Charleston — with significant differences that engineers working across the region have to navigate.
North Carolina uses the North Carolina State Building Code, which adopts the International Building Code (IBC) and International Residential Code (IRC) with state amendments. The NC State Building Code Council adopts and updates the code; the current edition as of 2026 is typically the 2018 NCSBC (following the 2018 IBC) with ongoing updates toward adoption of newer editions.
Key characteristics of the NC code environment:
Professional Engineers must be licensed by the North Carolina Board of Examiners for Engineers and Surveyors. PE licensure is required for any engineered structural design in the state. Enforcement is at the local level — each county and municipality administers permits and inspections — but the state code is uniform.
Most jurisdictions in the Charlotte and Raleigh metros have robust building departments with dedicated structural plan review. Turnaround times vary by jurisdiction and time of year.
South Carolina uses the South Carolina Building Codes Act, which adopts the IBC and IRC with state amendments. Like North Carolina, updates follow the national code cycles with a lag. The SC Building Codes Council oversees code adoption and publishes amendments.
Key characteristics:
Professional Engineers must be licensed by the South Carolina Labor, Licensing and Regulation Board. Enforcement is typically at the municipal or county level. Charleston has a particularly active building department plus additional review by historic preservation authorities for work in protected districts.
Charlotte has been one of the fastest-growing cities in the United States for two decades. The metro area adds tens of thousands of new residents per year, driving commercial office, retail, multifamily, and mixed-use construction. Our Charlotte practice focuses on:
Charlotte sits on Piedmont clay soils — moderately expansive, seasonal in behavior, and similar in many ways to Atlanta’s clay. Foundation settlement in older Charlotte buildings is common and drives a steady stream of forensic engineering investigations. See our foundation settlement guide for more on clay-related issues.
Wind loads in Charlotte are moderate — significant but not extreme. Seismic is low. Snow is modest. The main structural design challenges are growth-related (rapid construction schedules) and soil-related (clay foundations).
Raleigh-Durham’s growth has been driven by the Research Triangle Park, Duke University, UNC, and NC State. The result is an unusual mix of project types for a mid-size city. Our Raleigh practice includes:
Raleigh sits on Piedmont soils similar to Charlotte — clay over weathered bedrock in most of the region. Wind, seismic, and snow loads are all moderate. The major design challenges in Raleigh are project-specific: research buildings have unique vibration tolerances, data centers have unusual mechanical and floor loading requirements, and university construction often involves historic context sensitivity.
Charleston is the most structurally demanding market in the Carolinas, and probably one of the more demanding markets in the country. Three factors converge:
Charleston sits directly in the Atlantic hurricane zone. The design wind speeds are among the highest in the state. Buildings have to be engineered to resist sustained high wind and gust forces, plus wind-borne debris impacts. ASCE 7 wind load analysis is more involved and more consequential than in inland cities.
The 1886 Charleston earthquake registered an estimated magnitude 7.0 and remains the largest recorded earthquake east of the Mississippi. Modern codes incorporate this seismic history into Charleston’s design requirements, making seismic a real design factor — unusual for the Southeast.
Charleston’s Old and Historic District is one of the oldest and most strictly regulated historic districts in the country. The Board of Architectural Review oversees exterior alterations, and preservation requirements shape what structural engineers can and can’t do on historic buildings. Reinforcement of unreinforced masonry buildings — common in Charleston — has to meet both modern structural requirements and preservation standards.
Soft marine soils, high water tables, salt-laden humidity, and coastal flooding all affect structural design. Deep foundations (piles, helical piers) are common. Corrosion protection is essential. See our Charleston structural engineering services.
Despite their differences, the Carolinas share some structural engineering themes that any PE working regionally will recognize:
For work in North Carolina:
– Confirm active PE licensure with the NC Board of Examiners for Engineers and Surveyors
– Verify experience with NCSBC (North Carolina State Building Code)
– Ask for local project references in your specific jurisdiction
For work in South Carolina:
– Confirm active PE licensure with the SC LLR Board
– Verify coastal wind load experience for Charleston-area work
– Confirm historic preservation experience if your project involves a historic building
For multi-state projects across the Carolinas and beyond:
– Look for a firm with PE licensure in both states (Strut E&I is licensed in 28+ states including NC and SC)
– Verify experience across the regional markets you care about
– Confirm the firm carries professional liability insurance appropriate for your project
Do I need a structural engineer for a renovation in Charlotte or Raleigh?
For residential renovations, it depends on scope. Removing load-bearing walls, adding a second story, or modifying foundations typically requires a licensed PE. For commercial renovations, engineering is almost always required.
What makes Charleston structural engineering different from inland Carolinas?
Three factors converge in Charleston that rarely combine elsewhere: high hurricane wind loads, elevated seismic requirements from the 1886 earthquake, and strict historic preservation constraints. Engineers working in Charleston need experience with all three.
Can one structural engineer work across both North and South Carolina?
Only if they’re licensed in both states. Professional Engineer licensure is state-specific. A firm with licensure in both NC and SC (and ideally neighboring Georgia and Virginia) can handle projects that cross state lines without sub-consulting.
Are the Piedmont clay soil issues in Charlotte similar to Atlanta’s clay issues?
Very similar. Both cities sit on expansive clay soils that move seasonally with moisture changes. Foundation settlement symptoms — diagonal cracking, doors sticking, differential floor movement — show up in similar patterns in both cities. See our foundation settlement guide.
How long does structural plan review take in Charlotte and Raleigh?
Typical commercial structural plan review in Charlotte and Raleigh runs 2–6 weeks for a standard project, with variation based on project complexity and review backlog. Complex or large projects can take longer. Good documentation and code-compliant drawings significantly shorten the review cycle.
Is Charleston always required to go through historic preservation review?
Not always. Projects outside the historic district and outside locally designated buildings don’t require BAR (Board of Architectural Review) approval. Projects within the Old and Historic District, within local overlay districts, or on individually listed buildings typically do require preservation review.
What’s the biggest structural engineering trend in the Carolinas right now?
The shift toward taller multifamily and mixed-use construction in Charlotte, Raleigh, and Charleston has been a sustained trend. Buildings that would have been 5 stories a decade ago are now 8–12 stories, which changes the structural system, the foundation design, and the construction administration effort required.
Planning a project in Charlotte, Raleigh, Charleston, or elsewhere in the Carolinas? Strut Engineering & Investment, Inc. is licensed in both North and South Carolina and serves clients across the region with structural design, rehabilitation, forensic engineering, expert witness, and PCA services. Contact our team for a consultation.