• Most customers qualify for a $1,425 rebate through Focus On Energy*
    *Wisconsin homes only — not available in Illinois
Cozy Walls Foam Insulation Waukesha WI logo
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  • Injection Foam Wall Insulation

No Drywall Removal, Done in 1–2 Days

We fill your existing walls with foam from the outside, helping improve comfort and energy efficiency without removing your drywall or disrupting the inside of your home. There’s no major tear-out, no remodeling project, and no dusty interior mess.
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262-592-5381

Free · No obligation

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No pressure. No sales script. Just Erik and real numbers.

  • Veteran Owned & Operated
  • $750** Military Discount
  • Lifetime Transferable Warranty
  • Focus on Energy® Trade Ally
  • Serving Southeast Wisconsin

**Discounts apply to whole-home projects with a minimum job size of $5,000. One discount per household.

How It Works

Drill

We drill small, carefully placed holes through your siding or into the mortar joint. The holes are positioned to give us access to the wall cavities without removing your drywall.

Fill

We inject foam into the wall cavities, where it expands to fill the available space. Before filling, we check each cavity with a rod so we know where the cavity is and can help make sure nothing is missed.

Patch

Once the cavities are filled, we plug and patch the access holes the same day. Your siding stays in place, your drywall stays intact, and there is no major remodeling mess.

Cozy Walls technician injecting foam wall insulation from outside a Wisconsin home

What You Will Notice

Wall insulation is about more than adding insulation to your home. Filling empty or under-insulated wall cavities can make the walls feel warmer and help reduce drafts throughout the house.
You may also notice lower heating bills, a more consistent indoor temperature, and a quieter home. Foam-filled walls can help cut outside noise and reduce noise traveling from one room to another.
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Rebates That Can Help Lower Your Cost

We are a Focus on Energy Trade Ally, and qualifying wall insulation projects may be eligible for a minimum $1,425 rebate when the project meets the program requirements, including 600+ square feet and natural gas or electric heat.
We handle the rebate paperwork to make the process easier for you.
Learn More About Rebates & Discounts

Discounts for Wisconsin Homeowners

We offer additional savings for:

$750**

for veterans and active-duty military

$500**

for first responders

$500**

for teachers

$500**

for homeowners age 60+

$500**

for friends and family

Discounts are limited to one per household and apply to whole-home projects.

**Discounts apply to whole-home projects with a minimum job size of $5,000. One discount per household.

See the Difference

We don’t just insulate and leave you wondering whether it worked.
We use blower door testing and thermal imaging before and after the project to help show what is happening inside your home. Thermal imaging can reveal temperature differences across your walls, while blower door testing helps identify air leakage.
The result is a more measurable way to see the difference your insulation project can make.

Is Wall Insulation Right for Your Home?

  • We can work with many exterior finishes, including:
Vinyl
Aluminum
Wood
Brick
Block
Stone
Hardie
Injection foam wall insulation is especially useful for older homes where the exterior walls may be empty or have outdated fiberglass batts.
It may be a good option if your home was built before 1990, your walls are empty or contain fiberglass batts, and you want to improve comfort without tearing your walls apart.
We’ll evaluate your home’s construction and siding before recommending the right approach.
  • FAQ

Frequently Asked Questions

Does it work on my siding?
In many cases, yes. We can access wall cavities through different exterior finishes, including vinyl, aluminum, wood, brick, block, stone, and Hardie siding. We’ll assess your home’s construction and determine the best access method before starting.
Our process is designed to avoid removing your interior drywall. We make small access holes through the siding or mortar joints, fill the wall cavities, and then plug and patch those openings the same day.
Many wall insulation projects can be completed in one day; two-story homes or anything over 1,400 sq ft take two. We’ll give you a clearer timeline after evaluating your home.
Because we work from the outside, there is no need to tear out your drywall or remodel the interior walls. We drill small access holes, inject the foam, and patch the openings when we’re finished.
The cost depends on your home’s size, wall construction, accessibility, and the amount of insulation needed. See our Estimated Pricing page for more information.
View Estimated Pricing
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