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Home Addition & Basement Contractors in St. Louis

Outgrowing your current home doesn’t always mean it’s time to move. Whether you need more square footage above ground or you’re ready to finally put that lower level to work, J.T. McDermott Remodeling Contractors helps St. Louis area families expand their homes without leaving the neighborhood they love.

From full home additions and second-story builds to complete basement transformations, our design-build team handles every phase of the project, from structural planning to final finishes.

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Expert Home Addition & Basement Builders in St. Louis

Adding space to your home, whether it’s a new wing above ground or a finished level below it, takes a design team that understands how to make new construction feel like it always belonged. Our team is skilled at blending old and new architecture together, which matters most for homes throughout the St. Louis area.

Above ground, we build additions that give growing families the room they need, whether that’s a suite for aging parents or space for a home business. Below ground, we turn unfinished basements into some of the most-used rooms in the house, without the cost or disruption of a full structural addition.

Home Addition & Basement Ideas to Consider

There’s a real difference between simply adding space and adding value. Before any plans are drawn, we walk through your lot, your existing layout, and what you’re actually trying to solve, whether that means building up, building out, or building down.

Questions we help you answer:

Do you need more space, or a different kind of space?
Should you add a second story, expand outward, or finish your basement instead?
How will the new space match your home’s existing style and character?
What structural, moisture, or foundation issues need to be addressed first?
Will the space need permits for electrical, plumbing, or egress?

Our designers and craftsmen have the experience to answer these questions and guide you toward the option that makes the most sense for your home and budget.

Developing Your Addition or Basement Plans

Every successful project, above or below ground, starts with our proven design-build process. For additions, that means detailed structural planning and blueprints before a single wall goes up. For basements, that means checking for moisture issues, inspecting the foundation, and confirming proper outdoor grading before finishes are ever discussed.

Either way, you get an upfront budget, a clear schedule, and a finalized plan before work begins, so there are no surprises once construction starts. We handle all local permitting requirements as well, giving you peace of mind that your new space is built to code from day one.

Ready to Expand Your Home?

Whether your family needs more room to grow or you’re finally ready to turn that unfinished basement into a game room, home theater, guest suite, or home office, J.T. McDermott Remodeling Contractors can help you design a space that fits your lifestyle and adds real value to your home.

Need some inspiration first? Browse our completed home additions and basement remodels to see what’s possible. Still weighing your options? An outdoor living space might be worth a look too, if you’re deciding between adding space inside or out.

TESTIMONIALS

Here's what our satisfied clients are saying

We had the first floor of our two story home remodeled. This included a kitchen, dining room, living room, laundry room, powder room and hallway. We had all the windows and exterior doors replaced as well. This was a large project and it was completed in a very timely fashion, with all project deadlines met. From the initial estimate to the walk through at the end, everyone with JT McDermott Remodeling were wonderful. They're very knowledgeable, respectful and professional. Ron, our Project Estimator, helped us stay on budget and even presented us ways we could save money by offering alternate options. Brittany, our Project Designer, made the material selection process very easy and gave us confidence in our selections. Rob, our Project Manager, was on site daily, always kept us informed and took care of any questions or concerns we had. We lived in our home during the process. The workers kept their mess to a minimum and cleaned up every day. We are extremely happy with our new first floor. If you're looking for quality work at a fair price with trustworthy and friendly people, you should look at JT McDermott Remodeling.