11 Best Window Companies in Los Osos, CA (2025 Reviews)
Are you thinking about upgrading your windows? Our guide to the top window installation companies can help you pick the right one for you.
We analyzed all the top-rated window companies in Los Osos and selected the best 11 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
A review of the top window replacement companies in Los Osos may not seem like the most captivating article on the EcoWatch site, but trust us, windows have more of an impact on your life than you might think. If your house has traditional, outdated windows, your HVAC system could be working overtime to heat or cool your home. This means spending more on electric bills.
Fortunately, saving you money with more efficient windows also helps our goals of conserving energy and the resources it takes to produce it.
We’ve compiled a list of the top installation companies to help you in your search, so you can not only enjoy brand-new windows, but also save money on your energy bills.
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
Best Window Installation & Replacement Companies in Los Osos
The EcoWatch Reviews team researched dozens of window installation companies across Los Osos to narrow our list down to the top ones. We assessed the companies based on energy-efficient offerings, coverage area, customer service, price, local experience and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World offers windows expertise in Los Osos. Window World has about 27 years of experience in the industry, and it currently serves 200 locations nationwide.
It is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital.
Energy Efficiency of Window World WindowsWindow World offers some Energy Star windows, but note that not all its windows are energy-efficient, so make sure you ask for high-quality Energy Star windows when inquiring. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.
How much does Window World cost in Los Osos?Window World doesn’t have any prices displayed on its website, but it's known for offering some of the most affordable window installations around. For more accurate information on pricing, you can request a quote from the company.

Milgard Windows & Doors
EnergyStar Partner
Wide network of installers
Lifetime warranty available
Entails hiring third-party contractors
Limited additional services
Milgard Windows & Doors offers the best local installation in Los Osos. Milgard has about 60 years of experience in the industry, and it currently serves Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties.
It offers competitive pricing, a comprehensive warranty and installers that all have a minimum of 15 years of window installation experience.
Energy Efficiency of Milgard Windows & Doors WindowsMilgard Windows & Doors offers some Energy Star windows, but note that not all its windows are energy-efficient, so make sure you ask for high-quality Energy Star windows when inquiring. The company manufactures its own products, which gives it the freedom to make custom windows based on the climate. The company designs its own vinyl compounds and profiles to ensure a heat-stable product that performs as advertised.
How much does Milgard Windows & Doors cost in Los Osos?Milgard doesn’t have any prices displayed on its website, but it offers different kinds of windows at varying price points. For more accurate information on pricing, you can request a quote from the company.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen offers the best availability in Los Osos. Andersen has about 27 years of experience in the industry, and it currently serves nearly every state except Mississippi and West Virginia.
It uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen offers some Energy Star windows, but note that not all its windows are energy-efficient, so make sure you ask for high-quality Energy Star windows when inquiring. A handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019.
How much does Renewal by Andersen cost in Los Osos?Andersen doesn’t have any prices displayed on its website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. For more accurate information on pricing, you can request a quote from the company.
One thing to note is that the following companies are national, which means the quality of customer service may depend on your local team. We have tried to remain unbiased and transparent by including both pros and cons for every company.
More Window Companies in Los Osos
Construction Windows, LLC
Paso Robles, CAFree assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Vinyl Frames
Glass Doors
Metal Frames
Custom Window Designs
Fiberglass Frames
Window Replacement/Installation
Templeton Glass
Paso Robles, CAGood Customer Service
Free assessment
Price Transparency
Services Offered
Glass Showers
Window Replacement/Installation
Mirrors
Custom Glass
Glass Doors
Arroyo Grande Glass & Mirror
Arroyo Grande, CAPrice Transparency
Services Offered
Custom Window Designs
Skylights
Window Replacement/Installation
Custom Glass
Mirrors
Energy-Efficient Options
Glass Doors
Glass Showers
Paso Robles Glass
Paso Robles, CAPrice Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Glass Doors
Glass Showers
Tempered Glass
Mirrors
Metal Frames
A-1 Glass, LLC
Paso Robles, CAFree assessment
Good Customer Service
Price Transparency
Services Offered
Metal Frames
Fiberglass Frames
Glass Showers
Mirrors
Vinyl Frames
Window Replacement/Installation
Central Coast Screens
San Luis Obispo, CAGood Customer Service
Price Transparency
Educational Website
Free assessment
Services Offered
Bay Windows
Screen Repair
Window Replacement/Installation
Los Osos Glass & Window Inc
Baywood-Los Osos, CAPrice Transparency
Free assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Glass Showers
Glass Doors
Artistic Glass
Atascadero, CAFree assessment
Price Transparency
Good Customer Service
Services Offered
Glass Showers
Window Replacement/Installation
Glass Doors
Contractors Glass Company
San Luis Obispo, CAGood Customer Service
Price Transparency
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Glass Showers
Mirrors
Monarch Window
San Luis Obispo, CAEducational Website
Good Customer Service
Services Offered
Glass Doors
Window Replacement/Installation
Metal Frames
Wood Frames
Skylights
Artisan Windows and Doors
San Luis Obispo, CAPrice Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Calculate how much you can expect to pay for window installation and replacement in Los Osos, CA using our customized window cost calculator.
Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.
How Installing Energy-Efficient Windows in Los Osos Saves You Money
By switching to energy-efficient windows, you can enjoy several benefits, such as:
- Protect your valuables: The low-emissivity coatings on many energy-efficient windows help prevent your floors, carpets and furniture from fading by filtering out UV rays.
- Protect your investment: The older your home is, the more likely it is that switching to energy-efficient windows will benefit you. Older homes usually have windows that are outdated, drafty or maybe even damaged in some way. Upgrading your windows could help increase the value of your home if you decide to sell.
- Reduce your carbon footprint: Since energy-efficient windows improve the insulation in your house, you can lower your indirect greenhouse gas emissions by about 12%, according to Energy Star.
- Save money on electricity bills: The Department of Energy estimates that heat gained or lost via windows makes up about 25-30% of energy use in your home. Switching to energy-efficient windows can help lower that amount, which helps you save $521 a year on your bills.
Estimated Cost of Window Replacement in Los Osos
Windows come in all shapes and sizes, so costs and services will differ remarkably. Here are the typical costs and the primary services that you can find from window installation companies.
How Much Do New Windows Cost?
Typically, Los Osos homeowners can expect their replacement window installations to range from $250 to $1,200. The most common installations sit at approximately $600. These estimates vary depending on specific characteristics of your installation, like number of windows, the location of your home, type, size, material and more.
With windows, efficiency is the most important factor for many homeowners. High efficiency windows may cost more upfront, but by increasing the efficiency of your home — especially if you live in a hot climate — they can provide decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Los Osos homeowners $521+ a year after replacing single-pane windows.
Requesting free quotes from several providers is the best way to figure out which one is right for you.
What Services do Window Installers Offer?
The first step when planning an installation is to think about whether you should get a full-frame or pocket installation.
Full-frame installations are necessary when you want a new style or your window has a lot of deterioration. With this service, your installers will replace the entire window, including the sill, trim and frame. A pocket installation means replacing a window within the existing frame, which is usually cheaper than a full-frame installation.
If you’re hiring a reputable window installation company, your company will be able to advise you on the best type for your project. In Los Osos, the choice will mostly be based on how much damage there is currently and how old your existing frames are.
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
How We Choose the Best Window Installers in Los Osos
EcoWatch reviews differ from most reviews since we assess these companies through a sustainability lens. We have assessed the top window installers in Los Osos primarily based on energy efficiency, as the most sustainable option also benefits homeowners in many ways. Energy-efficient windows can cut your energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology is based on the following factors:
Service Area
Because this is a guide for Los Osos, we paid more attention to companies that cover the city. There are certainly other reputable providers that didn’t make our list because they wouldn’t be able to serve homeowners in Los Osos.
Work Quality
When choosing new windows, the quality and range of services often plays just as important of a role in insulation and performance as the brand you opt for. We do give window installers more points if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.
Customer Reviews
We analyzed patterns in recent customer feedback to determine the companies with the most customer satisfaction, weighted by sample size. Customer satisfaction might be the factor we place the most value on, as it indicates the quality of services across nearly every category, including quality of parts, cost, warranty, professionalism, quality of installation and more.
Cost
This one is a give-and-take: as with most services, cheap window companies are not going to provide the most quality service. On the other hand, we want to make sure we’re highlighting companies that provide a wide range of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies that have lengthy warranties for products, parts and labor rank higher with EcoWatch.
Years of Experience
Lastly, we like to see companies that have been in the industry for quite some time. Window installation companies that have more experience will earn higher rankings by our standards. We like to see at least ten years of experience.
Los Osos, CA Window Replacement FAQs
What is the average cost to replace windows in a home?
The national average cost of installing a single window is around $600 but can range from $200 to $1,200, depending on several factors. The price is often influenced by the type and material of the window, the location of your property and the size of the window. Also, bear in mind that energy-efficient windows may cost more upfront but can save you hundreds of dollars a year in energy bills.
What are the most common types of replacement windows?
There are several different kinds of windows you can get for your home, such as bay windows, awning windows, casement windows, double-hung and single-hung windows, transom windows, slider windows and picture windows.
When do I need to use a window installation company?
You should use a window installation company whenever you need new windows. Installing windows is a complex process that can take a lot of time, so it’s best left to the professionals.
Should I replace my windows all at once?
If you’re upgrading your windows to get more efficient windows, replacing all of your windows at once is the only way to see a noticeable difference. However, if you have only one or two windows that are broken or leaky, you can replace just those.
How long does window installation take?
Since a window takes about 30 minutes to install, around 16 windows can be installed in an 8-hour work day.