Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Before
After
Before
After
Before
AfterFast, Reliable Window Installation Across Hillsborough
Window installation in Hillsborough means working on some of the most architecturally significant homes in the Bay Area, and it starts long before the first screw turns. The Town of Hillsborough’s Architectural Review Board must approve every street-visible window or door replacement before a permit issues, and many of the pre-war estates along winding roads like Ralston Avenue and El Cerrito Avenue still carry original steel casement windows that the ARB expects replacements to match. We know this process cold. Call us at (903) 354-7134 and we’ll walk you through it from the first visit to final inspection.
Why Westlight Windows & Doors Is Hillsborough’s Preferred Window Installation Company
Westlight Windows & Doors is an independently owned and operated Kingswell location, founded in 2009 and led by Owen Satterfield. Owen’s crews have spent years working on Hillsborough properties, from Tudor Revival estates near the Burlingame Country Club to Spanish Colonial homes off Black Mountain Road. That experience matters when the ARB asks for divided-light documentation and profile drawings before they’ll issue a permit.
Our Hillsborough customers know we answer the phone. A real person picks up 24 hours a day, seven days a week. No voicemail boxes, no chatbots. And every job runs on the Kingswell Guarantee: a written price before any work starts, a committed arrival window, a clean job site, and a written guarantee on the completed work. If a repair fails within the guarantee period, we come back and fix it at no charge.
We show up in the window we gave, leave the place cleaner than we found it, and put the guarantee in writing. That’s The Kingswell Way, and it’s the only way we work in Hillsborough.
Casement Windows in Hillsborough
Casement windows are the single most common window type in Hillsborough’s pre-war homes, because the original steel casements from the 1920s through 1950s still frame many of the town’s finest Spanish Colonial Revival and Mediterranean estates. A casement replacement in Hillsborough typically runs $1,200 to $2,800 per window installed, depending on whether we’re rebuilding the rough opening, matching an arched masonry surround, or documenting a custom divided-light pattern for ARB review. The job involves removing the old steel sash, inspecting the jamb and sill for rot, correcting any framing issues, then setting a narrow-sightline unit that matches the original profile.
Steel-to-Aluminum-Clad Conversions
Original steel casements in Hillsborough are beautiful but brutal to maintain, and after 80 years of marine fog, the frames and glazing compound often fail at the same time. We regularly convert steel casement openings to aluminum-clad wood or true steel replacements with low-E insulated glass. The trick is maintaining the slim sightlines the ARB wants while upgrading the thermal performance the house needs.
Arched and Radius Casements
Hillsborough’s Spanish Colonial homes frequently have arched window openings that standard rectangular units cannot fill. We source arched casements and radius-top units through our manufacturer lines, including PGT and CWS, then document the profile and finish for ARB approval before installation. This is not a stock-item job, and it’s one of the reasons our Window Installation team spends extra time on the front end measuring and documenting.
Double Hung Windows in Hillsborough
Double hung windows appear most often on Hillsborough’s Tudor Revival and Colonial-inspired estates, particularly in the 1930s and 1940s homes along the lower foothills. A double hung replacement in Hillsborough generally runs $900 to $2,200 per window installed. That range covers everything from a straightforward sash replacement in a sound frame to a full rough-opening rebuild with code-mandated framing upgrades and a custom divided-light pattern.
Weight-and-Pulley to Modern Balance Systems
Older double hung windows in Hillsborough often still operate on sash weights and cotton cords hidden inside the jamb. When those cords snap, the sash slams or won’t stay open. Replacing a weight-and-pulley system with a modern block-and-tackle or spiral balance gives smoother operation and lets us insulate the weight pocket, which cuts the cold drafts these old frames are famous for.
Matching Divided-Light Patterns
The ARB looks hard at divided-light proportions on street-visible elevations, and a Tudor with six-over-six double hungs should stay six-over-six. We work with ES Windows and Mr-Glass to match true divided lights or simulated divided lights with the correct muntin profile. Getting this wrong means a failed ARB review and a delayed permit, so we document the original pattern in writing before ordering glass.
Trusted Brands We Service in Hillsborough
We carry and install eight manufacturer lines, and for Hillsborough work we lean on the ones that handle narrow sightlines, custom profiles, and impact-rated glass. PGT and CGI cover impact-rated needs on wind-exposed western hill slopes. CWS and ES Windows produce the aluminum-clad wood and narrow-sightline units that satisfy ARB profile requirements. We keep local stock calibrated to what Hillsborough homes actually need, which means faster turnaround when a casement or double hung has to be ordered against a permit deadline.
Common Window Installation Problems We See in Hillsborough Homes
Homes here are not like the production builds in San Mateo or Burlingame. Hillsborough’s housing stock runs almost entirely to custom estates of 4,000 to 12,000-plus square feet, and the age of those homes shows up in ways a tract-home contractor never sees.
- Rotted fir and mahogany jambs from marine fog. North- and bay-facing elevations on Hillsborough’s mid-Peninsula hillsides sit in damp morning fog for months each year. Original wood frames hold that moisture and rot from the inside out, so a window that looks fine from the street is often soft to the touch once the trim comes off.
- Knob-and-tube wiring running through rough openings. Open a 1930s Hillsborough wall and you may find live knob-and-tube wiring passing right behind the window jamb. A window replacement permit triggers current code requirements, which means that wiring has to be addressed before we can close the wall.
- Steel casement openings that are no longer square. After 80 years of settling, original steel casement rough openings are rarely plumb and square. Dropping in a stock vinyl double hung without correcting the framing leads to air leaks at the jamb and a unit that fails ARB review because the divided-light pattern doesn’t match.
- Failed insulated glass seals from chronic moisture. The damp microclimate here causes early seal failure on insulated glass units, especially on fog-facing elevations. The telltale is condensation between the panes that never goes away, and it means the seal is gone and the glass needs replacement.
Pricing for Window Installation in Hillsborough, CA
Window installation in Hillsborough is not priced like nearby cities, because the homes are larger, the windows are custom, and the ARB process adds documentation time that San Mateo or Burlingame jobs rarely require. For planning purposes: a standard double hung runs $900 to $2,200 per window, a casement runs $1,200 to $2,800, and a large picture or fixed window can run $1,800 to $4,500 installed. Bay, bow, and garden windows run higher because of the structural work involved. What moves the price most is what we find when the wall opens: rotted framing, knob-and-tube wiring, or an out-of-square rough opening. We handle that with a written change order, priced and approved by you before we do the work. Every Hillsborough job starts with a free estimate and a written price before any work begins. Call (903) 354-7134 to schedule yours.
We Also Serve Cities Near Hillsborough
While this page focuses on Hillsborough, our crews regularly install windows in nearby cities across the Bay Area and Southern California. We serve Los Angeles, San Diego, San Jose, and San Francisco, and we bring the same ARB documentation discipline and Kingswell Guarantee to every job. If you’re in one of those cities, our Hillsborough team can coordinate your project from start to finish.
Serving Hillsborough, CA - Our Local Coverage Area
We’re based in the Hillsborough 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 Installation in Hillsborough
Every exterior window or door replacement visible from the street in Hillsborough must clear the Town’s Architectural Review Board before a permit issues, because the town requires replacements to match the original architectural character in profile, material finish, and divided-light pattern. That means we document the existing window, prepare profile drawings, and submit for ARB review before ordering glass or starting work. We handle this paperwork as part of the job. Call (903) 354-7134 and we’ll explain exactly what your project needs.
On Hillsborough’s pre-war estates, opening a wall around a window often reveals rotted framing from marine fog, knob-and-tube wiring passing through the rough opening, and window frames that are no longer square after 80 years of settling. The permit triggered by the window replacement requires bringing those conditions up to current code, which is the single biggest driver of quote movement on these homes. We price those upgrades in a written change order before we touch anything.
Yes, and for Hillsborough homes with unknown framing conditions behind original windows, we recommend a two-phase approach. Phase one is a controlled inspection opening where we remove trim, document what’s behind the wall, and give you a written price for the full scope before ordering windows or doing finish work. You approve the price in writing before phase two begins. That’s part of the Kingswell Guarantee, and it’s how we protect you from door-step surprises.
Low-E glass, a thin coating that reflects heat back into the room in winter and out in summer, matters more in Hillsborough than in drier, sunnier parts of the Bay Area because persistent morning marine fog keeps north- and bay-facing elevations damp for long stretches. That dampness causes seal failure in standard insulated units, and low-E coatings reduce thermal stress across the glass surface. For Hillsborough homes, low-E insulated glass is a baseline specification, not an upsell.
Yes, for any street-visible elevation, Hillsborough’s ARB requires replacement windows and doors to match the original architectural character in profile, material finish, and divided-light pattern. A contractor who proposes a standard vinyl double hung into a 1930s Spanish Colonial will lose the ARB review. We source narrow-sightline steel or aluminum-clad wood units that match the original, then document the match for approval. Call (903) 354-7134 to get a written plan and price for your specific home.
Get Your Hillsborough Window Installation Estimate
On a 1930s Spanish Colonial Revival estate off West Santa Inez Avenue, our crew pulled a north-facing original steel casement and found the fir jamb rotted through where marine fog had kept it damp for decades, plus knob-and-tube wiring running through the rough opening. We documented the framing and wiring, priced the repair and code upgrade in a written change order, and reset a narrow-sightline aluminum-clad casement with low-E insulated glass and back-primed jambs after ARB sign-off. That’s the job done the Hillsborough way: documented, priced, permitted, and guaranteed.
Westlight Windows & Doors is led by Owen Satterfield, and we’ve been installing windows since 2009. If you live in Hillsborough and you’re ready to talk about your windows, call (903) 354-7134. A real person answers. Your written estimate is free, and your written price comes before any work starts.
Written by Owen Satterfield, Owner at Westlight Windows & Doors, serving Hillsborough since 2009.