Home Addition Contractors in Charleston, SC
CUSTOM HOME BUILDING
HOME ADDITIONS
HOME REMODELING
There is something incredibly special about finding the perfect street, the right school district, and a community of neighbors who feel like family. But houses don’t always keep up with the pace of our lives. When you need more space—whether it’s a main-level owner’s suite, a gourmet kitchen expansion, or a detached guest cottage—moving isn’t your only option. In fact, between real estate commissions, moving logistics, and increasing market values, expanding your current home is often the most rewarding way to stay right where you are.
At Stono Construction, we are a small, dedicated team of local builders specializing in seamless home additions across the Charleston area. We bring over 20 years of hands-on experience to complex structural expansions, executing your architectural plans with an intimate, face-to-face approach.
We proudly serve homeowners in Downtown Charleston, South Mount Pleasant, West Ashley, James Island, Johns Island, and Wadmalaw.
The Stono Approach: A True Local Partnership
An addition is vastly different from building a new home from scratch. We are physically expanding an existing building, which requires an immense amount of structural discipline and a crew that treats your active property with extreme respect.
On-Site Principal Supervision
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A principal of Stono Construction oversees your job site while work is going on. This close supervision is vital when we are breaching an exterior wall, pouring an adjacent foundation, or marrying a new roofline to your original home. We monitor every single junction to ensure a flawless structural transition.
Architectural Plan Execution
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We build strictly from your provided architectural plans. We collaborate closely with your chosen architect or design professional early in the pre-construction phase to ensure their creative expansion concepts align seamlessly with real-world constructability, engineering realities, and your budget.
Protecting Your Environment
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To create the pass-through from your existing home into the new addition, we often have to cut into older structural walls. If your home was built prior to 1978, Stono Construction deploys our status as an EPA-certified Lead-Safe Firm, handling all necessary field assessments to keep your family completely safe during structural tie-ins.
Navigating Regulations & Coastal Realities
Adding on to a home in coastal South Carolina involves an intricate maze of local rules. Because we live and build right here, our team helps you navigate these hurdles smoothly during the permitting and build phases:
- The 50% Rule & Flood Zones: If your home sits in a local flood zone (such as an AE, VE, or Coastal A zone), municipal “Substantial Improvement” rules come into play. If a new addition’s cost exceeds 50% of the existing building’s market value, local codes may require bringing the original structure up to current flood and building code standards. We review your plans against these property variables to execute a smart, fully compliant project.
- Historic Districts & HOAs: Whether you are navigating strict Board of Architectural Review (BAR) guidelines downtown, or specific neighborhood covenants in South Mount Pleasant (South of I-526), we ensure the physical construction of your addition perfectly respects local heritage and neighborhood rules.
- Septic and Land Dynamics: Planning a footprint expansion on Johns Island, James Island, or Wadmalaw often means dealing with private utilities. If your plans include new bedrooms, we help you secure the necessary DHEC permits and evaluate your active septic tank capacity to ensure the build footprint is perfectly accommodated.
Our Home Addition & Flex Suite Building Services
We don’t do cookie-cutter framing extensions. We build every project to precisely match your architectural specifications and your property’s distinct boundaries:
- Main-Level Footprint Expansions: Expert structural execution of vaulted owner’s suites, luxury bathroom additions, open-concept kitchen expansions, and custom Lowcountry mudrooms designed to handle sandy feet and damp beach towels.
- Vertical Space Additions: Modifying and rebuilding roof or ceiling truss systems to safely build an entire second story based on your engineering plans, maximizing your square footage without sacrificing your yard or violating local lot coverage limits.
- The “Flex Suite” & Detached ADUs: We construct detached Accessory Dwelling Units (ADUs) or garage apartments inspired by historic Charleston outbuildings. Working directly from your architect’s architectural plans, these spaces are fully climate-controlled and structurally engineered to transition seamlessly from a quiet daytime home office to a private weekend guest house.
Honest Budgeting for Additions
We believe in full transparency from day one. Every home addition involves unique structural variables—such as matching older framing alignments, rerouting active plumbing lines, or upgrading your electrical panel to support new HVAC loads.
We provide a thoroughly itemized breakdown of costs based on your plans, structural engineering and homeowner inputs and specifications. We build in realistic allowances and recommend a healthy contingency budget for unforeseen conditions behind original exterior walls. You will always see and approve clear, formal written change orders for any changes before that work takes place.
Frequently Asked Questions
Why shouldn't I use a cost-per-square-foot estimate for an addition?
Cost-per-square-foot metrics only work well for uniform, high-volume new construction. Additions are highly customized. The cost is heavily driven by how we tie into your existing roofline, whether your current electrical panel can handle the new load, the specific flood zone requirements of your lot, and numerous other variables. An itemized quote based on completed architectural plans is the only way to accurately predict your budget.
What is a Flex Suite ADU, and can I build one on my lot?
A Flex Suite is a detached Accessory Dwelling Unit (ADU) or guest cottage. In areas like the City of Charleston or Mount Pleasant, there are strict zoning rules regarding maximum square footage, lot coverage, setbacks, building heights, and specific uses, such as additional kitchens. We review your architectural plans against local municipal ordinances and ensure your detached suite has been successfully permitted to be built.
How do you handle matching the new addition to my old home?
Achieving a natural, cohesive visual flow is our primary goal. We source materials that respect your original home’s character—whether that means carefully sourcing matching siding profile dimensions, paint-matching weathered brick surfaces, or assessing your current roof’s remaining lifespan to determine if a full reroof makes the most long-term financial sense.
“My combination rehab & new construction project was completed in 2022. Working with John Goodwin on the project, communication & follow through were key since I was out of state most of the time. Any project has surprises but when they came up, options & solutions were handled professionally. I am very pleased with the outcome & value how I can still reach out to John for support. Both John & his partner Dan run a professional operation & I recommend their services.”
“I can’t say enough about this company. After deciding to completely renovate and move into my childhood home, Stono was referred by a neighbor and we made the inquiry. After hearing so many stories about the difficulty of doing a complete renovation I had my doubts and assumed we could bull our way through the project. John and Dan completely changed my perspective… they were extremely knowledgeable and helpful in getting us where we wanted to be as far as results and budget constraints. Communication was impeccable and their ability to adapt and continue forward made any hiccups we encountered seem like a passing thought. The final product is everything we wanted and then some! If you need something done well and with the ease of true professional help this is the company for you.”
“John and Dan have performed work for me both in the time frame anticipated and right on budget. I am appreciative of the professional manner in which my work was accomplished as well as the professional way in which I was treated. I like to know everything about what to expect when work is done for me. I always ask a lot of questions and all of my questions have been researched and answered thoroughly. I welcome the knowledgeable suggestions about construction that John offered me when I was making decisions pertaining to building projects. Lastly, I am grateful for the followup that Stono Construction routinely performs to insure that the work has been done properly and to my satisfaction.”
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