Built on Faith.

Built on Integrity.

Built to Last.

Save 20% on kitchen and bath remodels and windows for a limited time!

Expert Kitchen, Bathroom Remodeling, and Window Replacement Contractor Serving La Crosse and Onalaska, WI

At Firm Foundation Construction, we believe great construction starts with a strong foundation, not just in structure, but in values. Your home is more than just a building; it's a blessing, and we treat it that way.

 

With 14 years of proven experience, we proudly serve homeowners throughout La Crosse, Onalaska, Holmen, West Salem, Trempealeau, and surrounding Western Wisconsin communities. Whether you're looking to transform your kitchen or bathroom remodel, upgrade your home with quality roofing and siding installation, or enhance your exterior with window and door replacement, our mission is to provide "white-glove" service rooted in honesty, craftsmanship, and integrity.

 

We use American-made products, supporting US workers and ensuring quality that lasts for generations.

Firm Foundation Construction Team

Interior & Exterior Remodeling

At Firm Foundation Construction, we are a full-service construction company committed to delivering the perfect balance of price, quality, and craftsmanship. From remodeling and custom woodworking to complete home upgrades, we take pride in providing dependable service, honest work, and results you can trust. We care about every project and every customer because your home deserves the best.

Modern bathroom with glass shower, toilet, and dark wood vanity with large mirror
Modern two-story house with stone and blue siding, lit windows, and a three-car garage at dusk

Windows

Stop the drafts and lower your energy bills with American-made windows and doors. We combine the latest in glass technology with the highest-rated steel entry doors to keep your home quiet, comfortable, and secure in every season.

Learn More
Stone house entry with wooden door, lanterns, and potted flowers on the porch

Doors

Upgrade your home with new doors that improve style, security, and energy efficiency. Whether you’re replacing a front door, installing sliding glass doors, or updating all the doors in your home, modern options add beauty, comfort, and lasting value.

Learn More
Close-up of a house roof with gray shingles and multiple gabled sections

Roofing

Protect your home with professional roofing services designed to keep your property safe and secure. From hail and wind damage inspections to roof repairs, complete re-roofs, and new roof installations, we provide dependable workmanship and quality materials built to withstand the elements and add lasting value to your home.

Learn More
Modern green house with white trim and dark gray roof under a blue sky

Siding

Upgrade your home’s exterior with siding built to withstand harsh Midwest weather. Our premium steel and fiber-cement options don’t just beautify your home; they provide maximum energy efficiency and fire resistance with virtually no maintenance required.

Learn More
Wide wooden deck beside a beige house, overlooking a grassy yard and leafless trees under a blue sky

Why Choose Firm Foundation Construction?

Choosing a contractor is about more than just a price tag; it is about finding a partner you can trust with your home and your family. Here is how we stand apart.

Window Replacement Service Onalaska, WI

14 Years of Proven Experience

As a licensed and insured contractor, we bring over a decade of hands-on expertise to every job site. We have a long track record of successful projects across Western Wisconsin, giving you the peace of mind that your home is in the hands of seasoned professionals.

Faith-Based Integrity

Our values are the foundation of our business. We operate with honesty and transparency in every interaction, treating your property with the respect it deserves. We believe in doing the right thing even when no one is looking, ensuring a project that is built on trust.

Unmatched Customer Service

We believe in a "white-glove" experience that prioritizes clear communication and respect for your daily life. From the first consultation to the final cleanup, we maintain a professional workspace and ensure there are no surprises or hidden costs.

Premium USA-Made Materials

We are proud to support American workers and manufacturing by exclusively using high-quality products made in the United States. By selecting brands like Pella, Malarkey, and TimberTech, we provide materials engineered specifically to withstand the harsh Wisconsin climate.

Flexible Financing and Free Estimates

Protecting your home should not be a financial burden. We offer free, detailed estimates and flexible financing options to help our neighbors in La Crosse County and beyond achieve the home they deserve without the stress of upfront costs.

Amish Partnership with Levi

At Firm Foundation Construction, we are proud to partner with our Amish friend, Levi, to bring exceptional craftsmanship and quality woodworking to every project. We love working alongside Levi to provide our customers with beautiful custom woodwork at great prices! All built with care, precision, and attention to detail.

From hardwood floors and bathroom vanities to custom kitchen cabinets, trim work, built-ins, doors, and tongue-and-groove ceiling or wall boards. If it’s made of wood, Levi can make it! Our Amish partnership allows us to offer timeless craftsmanship and

one-of-a-kind custom features that make every home unique.

Take a look at some of our Amish woodwork featured in home remodeling projects throughout the La Crosse, Holmen,

and Onalaska areas.

Wood-paneled ceiling with exposed wooden beams above a room with warm wall lights.
Empty room with light wood floors and two windows, viewed from a low angle
Workshop with stacks of unfinished wooden boards and benches inside a large storage space

Our Process

A Simple, Honest Path to Your Project’s Completion

Grey carpet tile with a white marble-like sample showing dark veining cracks.

Beyond Boundaries

Visual odyssey across continents
Button
Small bathroom with bathtub, shower curtain, wall shelves, and marble-pattern walls.
Stainless steel showerhead and shelf against white and gray marble tile wall

Free Consultation and Inspection

We begin by visiting your home to discuss your vision or assess any damage. Whether you are planning a luxury remodel or need a post-storm roof inspection, we provide a detailed, honest assessment at no cost to you.

Material Selection and Design 

We guide you through choosing premium, American-made products that fit your lifestyle and our Wisconsin climate. From custom Amish cabinetry for your kitchen to impact-rated shingles for your roof, we ensure you have the best materials for a lifetime of durability.

Final Walkthrough and Warranty Support

A project isn’t finished until every detail meets our high standards of craftsmanship. We perform a thorough final inspection with you, register your manufacturer warranties, and ensure you are completely confident in your home’s "firm foundation."

Professional Installation

Our expert tradesmen and foremen lead the build with rigorous quality control. We treat your property with the utmost respect, maintaining a clean workspace and providing regular updates so you always know exactly what to expect.

Free Consultation and Inspection

We begin by visiting your home to discuss your vision or assess any damage. Whether you are planning a luxury remodel or need a post-storm roof inspection, we provide a detailed, honest assessment at no cost to you.

Material Selection and Design 

We guide you through choosing premium, American-made products that fit your lifestyle and our Wisconsin climate. From custom Amish wood products to impact-rated shingles for your roof, we ensure you have the best materials for a lifetime of durability.

Professional Installation

Our expert tradesmen and foremen lead the build with rigorous quality control. We treat your property with the utmost respect, maintaining a clean workspace and providing regular updates so you always know exactly what to expect.

Final Walkthrough and Warranty Support

A project isn’t finished until every detail meets our high standards of craftsmanship. We perform a thorough final inspection with you, register your manufacturer warranties, and ensure you are completely confident in your home’s "firm foundation."

Our Customers Say It Best – Read Their Reviews!

⭐⭐⭐⭐⭐

Alex and Andrew are nop notch! Highly recommend them for your next project!


- Brandon S.

⭐⭐⭐⭐⭐

Firm Foundation Construction did an outstanding job from start to finish. The team was professional, reliable, and very knowledgeable. They communicated clearly, showed up on time, and completed the work with great attention to detail. The quality of their craftsmanship truly stands out, and the results exceeded my expectations. I highly recommend Firm Foundation Construction to anyone looking for honest service and excellent work.


- Billy R.

⭐⭐⭐⭐⭐

Andrew and team at Firm Foundation Construction are top notch! Our installer was great and very professional doing interior work while my wife and I both work from home. If you want a contractor doing work for all the right reasons, this is the place!


- Andy L.

⭐⭐⭐⭐⭐

We had found a water leak coming from our roof and called a few places to quote replacement. Andrew came in to do the inspection l. I felt the inspection was very thorough. After he was very informative and offered other suggestions without pushing a sale. All questions were answered very well. Once we decided what we wanted Firm Foundation Construction made it happen! Communication was excellent during the project. Final product turned out better than we expected. We would definitely us Firm Foundation Construction on future projects!


- Nicklaus H.

⭐⭐⭐⭐⭐

Very nice to work with.

Took a lot of time out of their day to talk over the estimate and be comfortable with plan from day 1

Always available for questions and concerns


- Casey F.

Let our experienced team provide the honest, expert representation your home deserves.