About The5thwall
A father & son team building trust — one home at a time.
Built on Family, Driven by Craft
The5thwall started with a simple idea: what if a construction company actually treated every project like it mattered? Not as a line item on a spreadsheet, but as someone's home — the place where their family gathers, where their kids grow up, where they start and end every day.
Founded by Stefanos Karpontinis and joined by his son Tony, The5thwall is a father-and-son operation rooted in Central New Jersey. Between them, they bring over two decades of hands-on construction experience — from framing to finish work, from blueprint to final walkthrough.
The name “The5thwall” represents going beyond the blueprint — beyond the four walls of a floor plan to deliver something unexpected. That fifth wall is the quality, care, and personal attention that turns a renovation project into a home transformation.
Meet the Builders
When you work with The5thwall, you work directly with the owners.
Stefanos Karpontinis
Founder & Lead Contractor
Stefanos brings over 20 years of hands-on construction experience to every project. From framing to finish work, he's built and renovated hundreds of homes across Central New Jersey. His attention to detail and commitment to doing things the right way — the first time — is what sets The5thwall apart. When he's not on a job site, he's mentoring the next generation of builders.
Tony Karpontinis
Project Manager & Design Lead
Tony combines modern design sensibility with practical construction knowledge. He manages projects from initial concept through final walkthrough, ensuring every detail meets The5thwall's standard. His ability to translate a homeowner's vision into a buildable plan — and then execute it on time and on budget — makes him the perfect bridge between design and construction.
What We Stand For
These aren't just words on a wall — they're how we run every project.
Craftsmanship
We do things the right way — not the fast way. Every joint, every seam, every finish is held to the same standard we'd demand in our own home.
Transparency
No hidden fees, no surprise change orders, no vague timelines. You get a detailed estimate and regular updates from day one.
Accountability
We're licensed, insured, and we stand behind our work. If something isn't right, we fix it — period.
Respect
We treat your home and your time with respect. Clean job sites, protected finishes, and crews who show up when they say they will.
Serving Central New Jersey
We provide residential renovation and construction services across Mercer County and surrounding areas.
Areas We Serve
Don't see your town listed? We serve most of Central New Jersey. Give us a call at (762) 220-4637 to ask about your area.
Ready to Start Your Project?
Get a free, no-obligation estimate from our team. Licensed, insured, and ready to build.