Serving Louisville, CO
Insulation & Air Sealing in
Louisville
Louisville was one of the first coal mining towns in Boulder County, founded in 1878 a year after the Welch Mine opened, and Old Town still has the small houses that era built. On December 30, 2021 the Marshall Fire swept through the city and destroyed 550 Louisville homes; by August 2026 the city counted 532 of them rebuilt or under way. That makes Louisville two housing stocks at once: century-old and brand new.
Louisville At A Glance
The conditions we design around here
Elevation
5,336 ft
County
Boulder County
Radon risk
EPA Zone 1 (highest predicted risk)
Housing stock
Median year built 1991: an 1878 coal-town core, 1980s and 90s subdivisions, and hundreds of post-2022 Marshall Fire rebuilds
Climate drivers
Downslope wind (70 to 100 mph gusts drove the December 2021 Marshall Fire), hail, high solar gain
Why Louisville Homes Are Different
Old Town charm, and a neighborhood rebuilt from the ground up
The city’s plan names nine neighborhoods, from Old Town and Hecla to Coal Creek, the one the fire hit hardest. The median Louisville home was built in 1991, but the range runs from 1880s miners’ houses to 2024 rebuilds that beat the energy code.
Old Town and the coal-era houses
Frame homes from the 1880s to the 1920s with empty wall cavities, plaster, and attics never brought to modern depth. Dense-pack and air sealing modernize them with the character intact.
Davidson Mesa, Lake Park, and the 1980s and 90s
Thin attic batts, leaky rim joists, and the first builder-grade windows. Start with the attic: seal it, then add depth.
Rebuilds after the fire
New homes in Coal Creek and the surrounding blocks were built tight, which shifts the work to balanced ventilation, commissioning, and the few leaks that survive construction. A blower door is how a rebuild proves it.
Boulder County radon
Boulder County’s health department puts elevated radon at one home in two, and a tight new rebuild holds it in. Testing is the only way to know.
Diagnostics
What we commonly find in Louisville homes
These are the patterns that show up repeatedly in this housing stock and climate. Your home gets tested, not assumed, but this is where we look first.
Empty walls in the coal-era houses
Miners’ houses were built with nothing in the walls and most still have nothing. Dense-pack is the fix and the comfort change is immediate.
Rebuilds that need commissioning
A new tight house with no blower door number and no ventilation plan can be stuffy and damp in winter. Testing and balancing finish the job the builder started.
Rim joists in the 1990s two-stories
Davidson Mesa and Lake Park era homes commonly have an open, uninsulated rim joist, the largest single leak in an otherwise sound house.
Attic depth from 1990
Insulation installed in the early 1990s is well short of today’s target and has settled. Top-ups here are cheap relative to the gain.
Services in Louisville
What Louisville homes call us for most:
Where We Work
Louisville neighborhoods and areas we serve
We cover Louisville and the surrounding Boulder County area. If your street is not listed, it almost certainly still falls inside our range, so just ask.
- Old Town
- Hecla
- North Louisville
- Davidson Mesa
- Lake Park
- Coal Creek
- Hillside
- Fireside
- South Louisville
Local Rebates
Rebates for Louisville addresses
Louisville’s electricity and gas both come from Xcel Energy, so every address here can use Xcel’s audit rebate of up to 60%, its rebates on insulation, air sealing, and HVAC, and the $600 bonus for doing the envelope before the heat pump. We verify the live amounts for your address and handle the filing.
Boulder County’s EnergySmart program retired its standard rebates in late 2025; in 2026 it helps income-qualified households only (under the county’s 100% AMI line), paying half of a project to a $2,000 yearly cap, and its free advising stays open to all. Marshall Fire rebuilds can still use the city’s use-tax credit, extended through December 31, 2028. Power Ahead Colorado’s $1,500 heat pump rebate pays only through contractors the program has verified, and PowerHouse is not on that list today.
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Louisville questions, answered
Do you work in Superior as well?
Yes. Superior lost 378 homes in the same fire and shares Louisville’s utilities and rebate picture. Everything on this page applies to Superior addresses.
My rebuild is brand new. What could it possibly need?
A blower door test and a ventilation check. Tight new homes need balanced fresh air to avoid stale rooms and winter window condensation, and the test confirms the house performs the way the plans promised.
Can an 1890s Old Town house be insulated without gutting it?
Yes. Dense-pack goes in through small access points, the attic is sealed and brought to depth, the rim joist is sealed. The plaster stays.
What happened to the EnergySmart rebates?
The standard rebates ended in late 2025. In 2026 EnergySmart pays income-qualified rebates only, and its free advising stays open to all. Xcel rebates still apply to every Louisville address, and we file those.
How bad is radon in Louisville?
One home in two, by Boulder County’s count. Test, including new rebuilds; mitigation brings a high reading down and keeps it there.
Nearby Towns
Also serving the towns around Louisville
Same crews, same building science. Rebates follow the utility that bills you, so we confirm yours before the quote.
Superior, CO
Xcel Energy for electricity and gas, the same utilities and Boulder County programs as Louisville. The Marshall Fire destroyed 378 Superior homes; by December 2025 Boulder County counted 829 rebuild certificates of occupancy countywide, and the town reports most rebuilds beat the energy code. Rock Creek Ranch, subdivided in 1987, is the largest neighborhood.
Nearby
We also serve these communities
Get Started Today
Ready to fix your Louisville home?
Free quotes for Louisville and the surrounding area, with every local rebate verified before you commit. Tell us what your home is doing and we will map the fix.
970-594-8280