Window Replacement in Hillsborough - Free In-Home Measure, Written Price

Fast, Reliable Window Replacement Across Hillsborough

Replacing windows on a Hillsborough estate is not the same job as replacing windows in a 1990s tract home, and if you have lived here any length of time you already know why. The Town’s Architectural Review Board sets the terms. The original steel casements and mahogany frames set the conditions. And the marine fog that rolls over the bay-facing slopes sets the clock on how fast hidden rot spreads. We work inside all three constraints every single week. Westlight Windows & Doors was founded in 2009, and our crews know the difference between a Sawyers Court villa and a Lakeview Drive modern before we ever walk the property. Call (903) 354-7134 and we will walk it with you, free.

Call (903) 354-7134

Why Westlight Windows & Doors Is Hillsborough’s Preferred Window Replacement Company

Hillsborough homeowners hire us because we answer the phone and we show up in the window we gave. Not a chatbot, not a voicemail box. A real person answers 24 hours a day, 7 days a week, and when you schedule an estimate, a background-checked, uniformed technician arrives at the time we committed to. You will know who is walking through your front door before they ring the bell.

Our reputation in Hillsborough has built the slow way, job by job, on estates where a neighbor watches every truck that pulls up. We carry eight manufacturer lines, including impact-rated PGT and CGI and energy-efficient ECO Window Systems, so we match the product to the house rather than forcing the house to fit one brand. And every single job, from a single insert window to a full estate replacement, is governed by the Kingswell Guarantee: a written price before any work starts, a committed arrival window, a clean job site, and a written guarantee handed to you at completion. If the work fails within the guarantee period, we come back and fix it at no charge. That is the 365-Day Done Right Promise, and it is in writing on every project.

Owen Satterfield leads our team, and the standard he set is simple: the west light is the late-afternoon sun that pours through a good window, bright and warm and worth doing right. That is why the company carries his name and his reputation into every Hillsborough job.

Window Replacement Company in Hillsborough

A Window Replacement Company working in Hillsborough has to clear a hurdle most Bay Area contractors never face: the Town of Hillsborough Architectural Review Board must approve the design of any replacement window visible from the street before a building permit issues. That means the window profile, material finish, and divided-light pattern all have to match the original architectural character of the home. A standard vinyl double-hung proposed into a 1930s Spanish Colonial will get rejected, and the permit stalls while the homeowner pays for a redesign. We begin every Hillsborough project by sourcing ARB-compliant windows, which typically means true steel or aluminum-clad wood with narrow sightlines. A full-frame replacement on a mid-century Hillsborough estate typically runs $1,800 to $4,200 per opening installed, depending on window size, material, and how much framing repair the opening needs once the old sash comes out.

ARB Compliance Sourcing

The Architectural Review Board looks at profile first. Original steel casement windows from the 1920s and 1930s have thin frames, narrow muntins, and a specific sightline that standard vinyl or fiberglass windows simply cannot reproduce. We source steel and aluminum-clad wood windows with narrow sightlines that satisfy ARB review without sacrificing thermal performance. Modern low-E insulated glass fits inside those narrow profiles, so you keep the historic look and stop paying to heat the fog.

Full Frame vs. Insert Replacement

On a Hillsborough estate with original steel casements, insert replacement is rarely possible, because the old steel frames are rusted, seized, or integrated into the stucco in ways that make a clean insert impractical. Full-frame replacement lets us address the rot behind the stucco, correct the flashing pan that was never installed, and back-prime the new jambs properly. It costs more than an insert, but on a 4,000 to 12,000 square foot pre-war estate, it is the only approach that holds up to the bay-facing damp.

Window Glass Replacement in Hillsborough

Window Glass Replacement in Hillsborough most often means swapping the failed insulated glass unit inside an otherwise sound frame, and on the original steel or aluminum-clad wood windows common in this town, that is frequently the most cost-effective repair. The north- and bay-facing elevations on Hillsborough’s mid-Peninsula hillside take persistent morning marine fog for months at a stretch, and that chronic moisture load causes early seal failure on insulated units. A single glass replacement on a standard fixed or casement window in Hillsborough typically runs $350 to $850 installed, while glass replacement in a true divided-light steel window with multiple individual panes can run $900 to $2,200 depending on the number of lites and whether we have to rebuild the glazing compound around each one.

Low-E Glass for Fog-Heavy Elevations

When we replace glass on a bay-facing elevation, we specify low-E glass, a thin coating that reflects heat back into the room in winter and out in summer. In Hillsborough’s damp microclimate, that coating also slows the condensation cycle that contributes to seal failure on the original units. The upgrade costs a modest premium on the glass itself and pays back in comfort and in glass that outlasts the originals by a decade or more.

Steel Casement Reglazing

Original steel casements often survive structurally while the glazing compound, the putty-like material that holds the glass in the steel sash, crumbles away. We remove the old compound, inspect the steel for rust, treat what remains, and reglaze with modern compound rated for exposure to persistent damp. If the steel rail is too far gone, we tell you before we order glass, because reglazing a rusted rail is throwing money at a window that needs to come out.

Trusted Brands We Service in Hillsborough

Westlight installs from eight manufacturer lines, and on Hillsborough projects we lean most heavily on CGI for impact-rated applications, ES Windows for aluminum-clad wood with the narrow sightlines ARB review demands, and ECO Window Systems for energy-efficient replacements on newer western-hills builds. These are brands we stock and install regularly, which means faster turnaround for Hillsborough customers and warranty claims handled directly through our relationship with the manufacturer, not through a third-party distributor. If your existing windows are from a brand outside our eight lines, we will tell you honestly whether restoration, reglazing, or replacement is the better path, and we will only propose products we actually install and stand behind.

Common Window Replacement Problems We See in Hillsborough Homes

• Original steel casement rot hidden behind intact stucco. The marine fog on bay-facing elevations keeps original fir and mahogany frames damp for long stretches, and the rot spreads behind the stucco where you cannot see it. By the time the window feels loose or the sash sticks, the framing behind it often needs repair.
• ARB rejection of standard vinyl double-hung windows. The Town of Hillsborough Architectural Review Board requires street-visible replacements to match the original profile, material finish, and divided-light pattern. A contractor who proposes standard vinyl into a 1930s Spanish Colonial wastes months and forces a redesign, and we see homeowners arrive at our door after exactly that experience.
• Failed insulated glass seals from chronic condensation. Original single-pane steel casements get retrofitted with insulated units, but without low-E coatings and proper back-priming, the persistent damp causes early seal failure, the fogged glass nobody can see through. We replace glass with units rated for the north-facing exposure.
• Hidden conditions once the wall is open. On pre-war estates, opening a wall for window replacement regularly turns up outdated knob-and-tube wiring, undersized framing, or missing flashing pans. We price those surprises in writing, after inspection, before we touch anything, so the remodel quote does not move on you mid-project.

Pricing for Window Replacement in Hillsborough, CA

We Also Serve Cities Near Hillsborough

Our window replacement team serves Hillsborough and the surrounding Bay Area, including Los Angeles, San Diego, San Jose, and San Francisco. If you live just outside Hillsborough, we will bring the same written-price guarantee and the same ARB-aware approach to your project. Visit our Hillsborough page for details specific to this town, or browse Window Replacement options available across our service area.

FAQs About Window Replacement in Hillsborough