Louisville runs from turn-of-the-century coal-mining cottages in Old Town to subdivisions built in the last few years. That range means the right window answer here varies more than in most Boulder County cities, and it means a company carrying one product line has to give a 1905 cottage and a 1995 two-story the same answer.
We're independent. We can put more than one line in front of you and let the trade-offs decide it.
Old Town, roughly 1880s through the 1930s. The blocks around Main Street. Small brick and frame miners' cottages with original wood windows, many still on weights and pulleys. As with any pre-war housing, the honest answer here is frequently repair rather than replacement — old-growth wood sash is denser and more durable than anything you can buy new, and it was designed to be serviced. Old Town also has historic preservation guidelines, and exterior changes on designated properties may require review. Confirm with the City before committing to a product.
Postwar through the 1970s. Ranches and split-levels filling in around the original town. Steel and early aluminum units, sometimes already replaced once with inexpensive vinyl. Aluminum conducts cold straight through the frame, so these feel drafty even with sound glass.
1980s and 1990s. The larger subdivisions on the east and south sides. First- and second-generation double-pane glass now thirty to forty years old, which is the biggest concentration of failing seals in the city. Fogged glass, sashes that won't hold, discontinued hardware.
2000s and newer, including post-fire rebuilds. Much of this is too new to need replacement. Homes rebuilt after the Marshall Fire in December 2021 have current windows and are generally out of scope, though we do get calls on isolated failures and on upgrades that were value-engineered out of a rebuild.
Our numbers, from our own jobs:
Old Town's small cottages run low on window count and frequently land well under those whole-home numbers. The east-side subdivisions run higher.
If your Louisville home is an original Old Town cottage with wood windows and sound frames, the best value is usually restoration rather than replacement. Sash repair, reglazing, weatherstripping, and a well-fitted storm window get you most of the comfort improvement while keeping the windows that make the house what it is.
Replacement becomes the right call when the frames themselves are rotted, when the hardware is unavailable, or when you're patching the same units year after year.
We do both, so we have no reason to steer you.
Louisville sits above 5,300 feet, and the same physics that affects the rest of the Front Range applies here: sealed glass units built near sea level arrive under pressure stress, and manufacturers handle it differently. It's a question worth asking whoever quotes you, and one most homeowners never hear raised.
We repair windows. Most companies in this market don't.
Louisville's mix makes the assessment matter. Some Old Town units are worth restoring, some east-side subdivision units are past it, and a real walk-through separates them.
Window repair → · More on drafty windows and where the air is actually coming from →
Louisville requires permits for window replacement work, including full-frame replacement, changes in opening size, and egress. We pull them.
Old Town properties may also be subject to historic preservation review for exterior changes. We'll flag it if it's likely to apply to your address.
Finishing a basement? Egress windows →
An Old Town cottage and a 1994 two-story aren't the same specification. Being independent means we don't have to pretend they are.
Three financing paths, including a Colorado on-bill program we're an authorized contractor for. Eligibility depends on your electric utility, so we'll confirm which paths are actually open to you rather than walking you through an application that won't go anywhere.
Entry, patio, and storm doors, installed by the same crew to the same standard. On Old Town homes a well-fitted storm door is frequently the cheapest real comfort improvement available.
We can source dozens of manufacturers. These are the five we know cold.
Manufacturer names and logos are trademarks of their respective owners.
Yes. Louisville is a regular service area for us.
Frequently restore, if the frames are sound. We'll tell you honestly which situation you're in, and we do the repair work either way.
Designated historic properties may require review for exterior changes. Worth confirming with the City before selecting a product.
Yes. Seal failure at that age is expected, and it doesn't happen uniformly — south and west elevations usually go first.
Yes. Entry, patio, and storm doors.