Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Fast, Reliable Window Replacement Across Thousand Oaks
Most full-frame window replacements in Thousand Oaks run $900 – $1,800 per opening installed, with insert replacements typically landing between $600 – $1,200 per window. Those are real numbers from the Conejo Valley market, and they come from jobs we scope every week along the 101 corridor. If your windows are 30-plus years old, fogged between the panes, or fighting a losing battle with Santa Ana winds, call (817) 686-2228 and our Window Replacement team will walk the job with you and put the exact price on paper before any work starts.

We know Thousand Oaks not as a dot on a route map but as a place where the wind comes hard off the ridgelines and the stucco on 1970s tract homes does not forgive a careless flashing detail. That is why every quote starts with the exposure, not the glass brochure.
Why Meridian Windows & Doors Is Thousand Oaks’s Preferred Window Replacement Company
Homeowners in Thousand Oaks call us because we answer the phone. A live person picks up 24 hours a day, seven days a week, every day of the year. No voicemail loops, no “we’ll get back to you next business day.” When a window fails on a Saturday morning and the wind is pushing through the opening, the person who answers is the person who can get a crew scheduled.
The work itself is backed by the 365-Day Done Right Promise: every installation and repair is covered in writing for a full year. If the work fails within that period, we return at no charge, including a free second visit. That guarantee is not a marketing line; it is printed on every job contract. Elliot Vance, who leads Meridian Windows & Doors, holds every crew to The Garrison Standard, the operating code that has governed the Garrison Partners family since 2009. Written prices before work begins. Background-checked, uniformed technicians. A job site left clean. No exceptions.
Window Replacement Company in Thousand Oaks
As a Window Replacement company working across Thousand Oaks, we handle the full sequence: removing the old sash and frame, correcting any rot or water damage at the rough opening, installing the new unit, flashing and sealing the perimeter, and finishing the interior trim. The permit process matters here. Thousand Oaks requires a building permit for window replacement when the opening size changes or when structural framing is touched, and the city’s plan review looks closely at wind exposure on hillside elevations. We pull the permit, schedule the inspection, and stand with the inspector until it passes.
Full Frame Replacement
Full frame replacement means the entire window, including the frame and sill, comes out and a complete new unit goes in. In Thousand Oaks this is common on 1960s and 1970s homes where the original aluminum frames have corroded or the rough opening has shifted. Full frame work runs $900 – $1,800 per opening installed.
Insert Window Replacement
Insert replacement fits a new sash and track assembly inside the existing frame. It is faster, less invasive, and makes sense when the current frame is square and structurally sound. In Thousand Oaks, insert replacements typically cost $600 – $1,200 per window and work well on the newer Rancho Conejo and Lang Ranch tracts where the original frames were built plumb.
Window Glass Replacement in Thousand Oaks
When the frame is still good but the insulated glass unit has failed – fog between the panes, condensation, a crack from a kicked-up rock on the 23 – a Window Glass Replacement in Thousand Oaks addresses the glass without full frame surgery. We replace the IGU, or insulated glass unit, with a new sealed unit spec’d for the same wind and thermal load as the original. Glass-only replacement typically runs $350 – $750 per window in Thousand Oaks, depending on whether the sash can be reglazed in place or needs to be pulled and reset.
Fogged and Failed Seals
A failed seal shows up as haze or moisture trapped between the panes. There is no way to clean it; the IGU must be replaced. We measure the sash thickness and spacer profile so the new unit drops in without modifying the frame.
Impact and Low-E Upgrades
If the original glass is non-impact and the window faces open ridgeline wind, upgrading to laminated impact glass at the same time as a reglaze is often the right call. Low-E coating – a thin metallic layer that reflects heat while letting light through – cuts solar gain in Thousand Oaks summers and helps with Title 24 compliance when the opening is touched.
Trusted Brands We Service in Thousand Oaks
We are authorized to install and replace products from CGI, CWS, ES Windows, and ECO Window Systems, among the eight manufacturer lines in our portfolio. That matters in Thousand Oaks because hillside homes often need a CGI or ES Windows unit rated for windborne debris, while a single-story ranch in Newbury Park might be better served by a CWS or ECO Window Systems vinyl line at a lower cost. Because we stock parts for these brands locally, turnaround on warranty work and glass replacement is measured in days, not weeks. We service Thousand Oaks from our Los Angeles-area scheduling office; crews work locally throughout the Conejo Valley.

Common Window Replacement Problems We See in Thousand Oaks Homes
- Under-rated glazing on hillside elevations. A cheap vinyl insert with a standard design pressure rating will fail inspection on an exposed ridgeline off Westlake Boulevard or Lynn Road. The plan reviewer will flag it, and now the homeowner is paying for a second set of windows.
- Water intrusion at the stucco jamb. Thousand Oaks tract homes from the 1960s and 1970s have stucco returns that need a proper flashing detail when the frame comes out. Skip the flashing, and the first winter rain will find the gap.
- Measuring only the visible opening. Older Conejo Valley homes often have rough openings that are not square. Measure just the sash and the new frame will not seat. We measure the rough opening before ordering anything.
- Fogged IGUs from seal failure. This is the most common glass-only call in Thousand Oaks. The windows are not broken; the seals have died from years of thermal cycling, and the fix is a new IGU, not a whole new window.
Thousand Oaks sits in a high-wind and wildfire-prone zone. That geographic fact is the spine of every window decision here. Many hillside homes above the 101 corridor need windows rated for both windborne debris and ember exposure, so the required design pressure and glazing spec often differ from what a standard inland Ventura County replacement would call for. A window that is perfect for a shaded Simi Valley tract may not pass inspection on an exposed elevation above Lynn Road. We quote the wind load first, then the glass.
We recently replaced thirteen double-hung units on a 1980s two-story in the Lynn Ranch area off Lynn Road, where the original single-pane aluminum windows had failed seals and cloudy insulated glass units. Because the rear elevation faces open ridgeline wind, we spec’d impact-rated laminated glass with a low-E coating and verified the design pressure against the exposure, then matched the new jambs and sash profiles to the existing stucco returns so no re-stucco was needed. The job passed inspection on the first visit.
Pricing for Window Replacement in Thousand Oaks, CA
For planning purposes, full frame replacement in Thousand Oaks runs $900 – $1,800 per window installed. Insert replacement runs $600 – $1,200 per window. Glass-only replacement runs $350 – $750 per unit. The biggest cost drivers are glazing type (impact-rated laminated glass adds $150 – $400 per window over standard low-E), frame material, and whether the rough opening needs carpentry correction. Permits run a few hundred dollars and are itemized on your quote. The price we put in writing before work starts is the price you pay. If something at the rough opening changes the scope, we tell you before touching it and get a written change order signed. Call (817) 686-2228 to schedule your free estimate.
We Also Serve Cities Near Thousand Oaks
Meridian Windows & Doors serves Thousand Oaks and the surrounding Conejo Valley, including Westlake Village, Oak Park, Agoura Hills, and Simi Valley. If your home sits just over the city line, call (817) 686-2228 and we will confirm scheduling for your neighborhood.
Serving Thousand Oaks, CA - Our Local Coverage Area
We’re based in the Thousand Oaks area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Window Replacement in Thousand Oaks
Yes, in most cases. Thousand Oaks requires a building permit when the window opening size changes, when structural framing is modified, or when the replacement alters the original design. Insert replacements that do not change the opening may fall under simpler review, but we confirm permit requirements on every job before ordering materials. Call (817) 686-2228 and we will check your specific address.
Because Thousand Oaks enforces wind-load requirements that vary by elevation and proximity to ridgelines. A window on an exposed hillside above the 101 corridor must meet a higher design pressure rating than one on a sheltered lot in the flatlands. We ask about exposure so the glazing spec passes inspection the first time. Guessing wrong means the inspector fails you and you pay twice.
Yes. We match new jambs and sash profiles to existing stucco returns whenever possible, so a full frame replacement does not require re-stucco or new exterior trim. The goal is a window that looks like it was always there. We confirm the match during the site visit and note it on the written estimate.
A typical single full frame replacement in Thousand Oaks takes one day on site, including removal, prep, install, flashing, and interior trim. Multi-window projects on a two-story home typically run three to seven working days, depending on the permit review timeline and weather. We give you a calendar at the time of the estimate and stick to it.
Only two things: rot or structural damage hidden inside the rough opening, or a change you request after the contract is signed. Both require a written change order that you approve before we proceed. The original line-item price does not move without your signature. That is The Garrison Standard, and it is written into every Thousand Oaks contract.
If your windows in Thousand Oaks are fogged, drafty, rattling in the wind, or simply old enough to vote, call (817) 686-2228. We will walk the job, put the price in writing, and stand behind the work for 365 days. A meridian is a fixed line you measure everything against – that is what the name means and how we run every install.
Written by Elliot Vance, Owner at Meridian Windows & Doors, serving Thousand Oaks with written pricing and the 365-Day Done Right Promise since 2009.










Before
After
Before
After
Before
After