Second-Story Addition Structural Engineering Services

A second-story addition is one of the most effective ways to increase living space while maximizing the value of your existing property. Rather than relocating to a larger home, many homeowners choose to build upward — preserving their location, school district, neighborhood, and existing investment. Whether you are adding bedrooms, expanding living areas, creating a home office, or constructing an entirely new floor, a properly designed second-story addition can significantly increase both the functionality and market value of your home.

From a structural engineering standpoint, adding a second story is not simply a matter of framing a new floor on top of an old one. Every additional square foot introduces new gravity, wind, and seismic loads that must be safely transferred through the structure and into the foundation.

The existing house was engineered — or, in older homes, simply built — to carry one story. Adding a second changes the demand on every element beneath it. The roof becomes a floor. Walls that were never load-bearing may need to become load-bearing. Point loads land where there is no footing beneath them. And the building's center of mass rises, which increases wind and seismic demand on the structure as a whole.

Our engineers perform a comprehensive assessment of the existing building to determine its actual capacity and identify any required structural upgrades before construction begins — and, critically, before the design is finalized. That sequencing decision is the most important one in the entire project.

Strut E&I provides complete structural engineering for second-story additions, from the first site visit through permit approval and construction support.

A licensed structural engineer inspects the existing home and documents what is actually there — foundation type and condition, wall framing, beam and column locations, joist spans and sizes, and any existing distress such as settlement, rot, or prior unpermitted modification. Older homes routinely differ from their original drawings. We document reality, not assumptions. This is closely related to our property condition assessment work.

We determine whether your existing foundation and footings can carry the increased load. This includes evaluating footing dimensions, foundation wall condition, soil bearing capacity, and the additional load the new story will impose. Where capacity is insufficient, we design the remedy — footing enlargement, underpinning, or new isolated footings at new point loads.

Every load must travel a continuous path from the new roof, through the new second-floor framing, into bearing walls, through beams and columns, down to the foundation, and finally into the soil. We verify that path exists and is continuous. Broken load paths — where a new bearing wall lands on an unsupported first-floor ceiling joist — are the most common and most expensive problem we find.

Complete structural design of the new floor and roof systems: joist and rafter sizing, beam and header design, column and post sizing, connection detailing, and the design of any new load-bearing elements required in the existing structure below. For projects that extend beyond additions, see our structural rehabilitation and building modification services.

A second story raises the building's center of mass and increases wind and seismic demand. We design the shear walls, hold-downs, and lateral bracing required to resist those forces under the applicable code — a step that is frequently overlooked and that permitting authorities increasingly scrutinize.

Sealed, stamped structural drawings and calculations suitable for submission to your building department, coordinated with your architect and ready for your contractor to build from. We remain available through plan review and construction to answer questions and issue clarifications.

The most expensive mistake homeowners make on second-story additions is sequencing. The common path is to hire an architect, develop a floor plan everyone loves, take it to a contractor for a bid, and only then discover that the structure cannot support it — or that supporting it requires tens of thousands of dollars of foundation and load-path work nobody budgeted for. At that point the plans get redrawn, the budget is blown, and the project stalls.

A structural assessment done first inverts that. It tells you what your house can carry, what it would cost to upgrade it, and where the structure wants the walls to go — before a single design decision has been locked in. The floor plan is then designed around a load path that actually works, and your contractor bids a scope that is real.

The assessment is a small fraction of total project cost. It is the cheapest insurance available on a six-figure project. If you take one thing from this page: get the structure evaluated before you finalize the design.

Strut Engineering & Investment, Inc. is a licensed structural engineering firm founded by Emad Badiee, who holds a BS and MS in Civil-Structural Engineering, has more than 16 years of experience, and is licensed in 28 states and the District of Columbia. Every project is assigned a dedicated licensed structural engineer — the person who evaluates your home is the person who seals your drawings.

We bring a forensic engineering background to residential additions, which matters more than it sounds. Investigating why buildings fail teaches you exactly where they are weakest — and a great many of those weaknesses live in the load path of an older house that someone decided to build on top of.

Our team also includes a Director of Construction who is a licensed General Contractor in Georgia, so our documents are built to be built from, not just to pass plan review. We serve homeowners, architects, and contractors across Greater Atlanta and throughout Georgia, South Carolina, North Carolina, Florida, Tennessee, and New Jersey, including single-family residential projects of every size.

Yes. Essentially every jurisdiction requires sealed structural drawings and calculations from a licensed engineer to permit a second-story addition, because the work fundamentally changes how loads move through the building. Beyond the permit requirement, the engineering is what determines whether the project is feasible at all and what it will actually cost.

Almost any house can structurally support a second story — the real question is what it costs to get there. Some homes need little more than new beams and a few footings. Others need extensive foundation underpinning and a rebuilt load path, at which point the economics may not work. A structural assessment is what tells you which house you own.

We strongly recommend it. An architect can design a beautiful plan that the structure cannot carry without expensive upgrades. Getting the structural assessment first means the design is developed around a load path that works, which prevents costly redesign later.

Sometimes, but not always. It depends on your existing footing dimensions, the soil's bearing capacity, and how much additional load the new floor imposes and where. New point loads — where a beam or column lands — are the most common trigger for new or enlarged footings, even when the general foundation is adequate.

The existing condition evaluation and analysis typically take a couple of weeks after the site visit, with full construction documents following. Timelines vary with project complexity and how much upgrade design is required. We give you a schedule up front.

Yes. We coordinate directly with your architect during design and remain available to your contractor through permitting and construction to answer questions and issue clarifications.

Planning a second-story addition? Start with the structure. Strut E&I will evaluate your existing home, verify its capacity, and tell you what it will take to build up — before you spend money on plans that may not work.

Call (404) 480-5555, email info@struteni.com, or contact our team to request a structural assessment. You can also browse our full range of structural engineering services.