Kasay Construction
Kasay Construction is a custom home builder and renovation firm in the Southeastern US specializing in high-performance, Passive House–informed construction. Founded by Steven Kasay — a mechanical engineer turned builder — the firm combines luxury craftsmanship with building science to create homes that are beautiful, durable, and genuinely healthy. From moisture-smart wall assemblies to advanced HVAC design, every project is engineered for comfort, resilience, and indoor environmental quality.
About
Steven Kasay started Kasay Construction in 2015 with a straightforward premise: the homes he was renovating weren't built as well as they should be. With a BS in Mechanical Engineering from Clemson and a background in construction management, he saw the failures up close — moisture getting into wall cavities, HVAC systems fighting the envelope instead of working with it, materials chosen for speed rather than performance.
In 2022 he became one of the only Certified Passive House Tradespeople in the Southeastern United States. That certification didn't change what the firm was already doing so much as formalize it: every Kasay project starts with the building science and works outward. Moisture-smart assemblies, advanced HVAC design, triple-pane windows when the project calls for it, and a constant focus on airtightness and durability. The result is homes that are quieter, more comfortable, healthier to live in, and built to last generations — not just until the next renovation cycle.
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Key Features
Kasay Construction brings engineering precision to luxury home building. Every project integrates Passive House principles, moisture-smart assemblies, and advanced HVAC design — creating homes that are quieter, more comfortable, and healthier for the families who live in them.
2015
Founded
CPHT
Passive House Certified (2022)
70-80%
Less to Heat & Cool (Folger House)
7,200 sf
Largest Healthy Renovation (Capstan Greens)
Why Choose Us
This is a builder who thinks like an engineer and finishes like a craftsman. Steven's mechanical engineering background means he understands the thermodynamics, airflow, and moisture physics that most builders never learn — and his Passive House certification means he applies that knowledge to every project.
Mechanical Engineer Turned Builder
Steven holds a BS in Mechanical Engineering from Clemson University. That means he approaches wall assemblies, HVAC sizing, and moisture management the way an engineer would — with calculations, not guesswork.
Certified Passive House Tradesperson
One of the only CPHTs in the Southeast. Passive House certification is the gold standard for energy-efficient, airtight, high-performance construction — and it fundamentally changes how a builder thinks about every detail.
Health at the Core
Not just a tagline. Kasay integrates moisture-smart assemblies, advanced HVAC design, and zero-VOC finishes into luxury custom homes. The Capstan Greens project — a 7,200 sq ft gut renovation — included zero-VOC finishes throughout and a wellness spa with cold plunge and sauna.
Coastal Resilience Built In
Operating in both the Charlotte area and the South Carolina Lowcountry, Kasay builds for humidity, coastal storms, and the specific moisture challenges that Southeast climates throw at a home.
Transparency and Communication
A 5-step process — Discovery, Design Assist, Pre-Construction, Build, and Commissioning — with weekly updates, strict quality checkpoints, and performance testing before handoff. You know what's happening at every stage.
Services List
Design & Build Services
- Custom Home Construction (Ground-Up)
- Luxury Whole-Home Renovations
- Additions & Primary Suite Expansions
- Kitchen & Bath Transformations
- Historic Home Renovation & Adaptive Reuse
- Commercial Construction & Interior Up-Fits
High-Performance & Building Science
- Passive House Principles & Airtight Construction
- Advanced HVAC Design & Sizing
- Moisture-Smart Wall & Roof Assemblies
- Triple-Pane Window & Door Integration
- Energy-Efficient Consultation & Design Assist
- Building Performance Commissioning & Testing
- Coastal Resilience Engineering
Steven Kasay
Founder — CPHT, BS Mechanical Engineering (Clemson)
Service Area
Markets Served
Coverage
Serves the Southeastern United States with confirmed projects in North Carolina (Charlotte, Lake Norman), South Carolina (Bluffton, Hilton Head), Virginia (Abingdon), and Florida (Fort Lauderdale).
Credentials
Certified Passive House Tradesperson (CPHT)
Obtained 2022. One of the only certified Passive House tradespeople in the Southeast. The CPHT credential certifies advanced knowledge of airtight construction, thermal bridge-free design, and high-performance building assemblies.
BS in Mechanical Engineering — Clemson University
Foundational technical training in thermodynamics, fluid mechanics, and systems engineering — directly applied to HVAC design, moisture physics, and building envelope performance.
General Contractor — NC, SC, VA, and FL
Licensed General Contractor in North Carolina, South Carolina, Virginia, and Florida
Platinum Member
Healthy Building Alliance
Professional ·