Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Sliding glass doors
Impact garage doorsPGTCGI
Before
After
Before
After
Before
AfterFast, Reliable Energy-Efficient Windows Across Hillsborough
Replacing windows in Hillsborough is a different job than it is almost anywhere else on the Peninsula. Most homes here are custom-built estates from the 1920s through the 1960s, and the Town’s Design Review Commission means a simple swap rarely stays simple. We know what the board expects because we’ve worked through their process on Spanish Colonial, Tudor, and Mediterranean homes all over town. If you’re weighing energy-efficient windows for an older Hillsborough property, call (888) 635-0804. We’ll walk the site with you, explain what the permit process actually requires, and give you a written line-item estimate before anything goes forward.
Why TruePane Windows & Doors Is Hillsborough’s Preferred Energy-Efficient Windows Company
We’re not the low bid. We’re the company that folder-holds every warranty layer in writing and registers both before our truck leaves your driveway. That matters in Hillsborough because so many window replacements here run through Design Review, architectural stamps, and custom fabrication. A crew that hasn’t worked with the Town will stall at the permit counter for weeks. We’ve been through it enough times to know which elevations need elevation drawings, when a structural engineer signs off, and how to keep the project moving while the board reviews.
Dale Kessler founded TruePane on a plain rule: if the pane is not true, the job is not done. That rule shows up in the way we measure every opening twice, quote manufacturer lines side by side on paper, and never leave a homeowner guessing what the glass will look like against original steel casements. Our technicians are background-checked and uniformed. They work in a Hillsborough home the way they’d work in their own mother’s. That’s not a slogan. It’s the standard.
We coordinate dispatch and scheduling from our San Francisco Bay Area office, and crews serve Hillsborough locally. A live person answers the phone 24 hours a day, seven days a week. When you call (888) 635-0804, you get a person who can talk about your specific street, your home’s era, and what the Design Review Commission will ask for.
Our Energy-Efficient Windows Services in Hillsborough
Low-E & Argon Gas Glass
Most Hillsborough estate homes still run on single-glazed steel casements or original wood sash with no low-emissivity coating. The marine fog that rolls up the hillsides keeps glass cool and damp, and a low-E coat with argon fill changes the whole thermal picture. We install custom low-E argon-fill insulated glass units sized to original frames, so the character of a 1920s Spanish Colonial stays intact while the glass performs like a modern window. The fog you see between panes on an older double-glazed unit usually means the seal has failed; low-E replacement glass solves that permanently.
ENERGY STAR Replacement Windows
ENERGY STAR windows in Hillsborough need to do two jobs at once: cut heat gain on the rare hot afternoon and keep heat in during the cool, damp nights that dominate most of the year. A standard big-box vinyl window won’t pass Design Review on most of these homes anyway. We quote ENERGY STAR-rated units from manufacturers that build custom shapes, true divided lite, and period-correct profiles. Every quote shows the U-factor and solar heat gain coefficient in writing, so you know exactly what you’re buying.
Double & Triple Pane Windows
Double-pane is the workhorse for Hillsborough homes built after about 1950. Triple-pane is where it gets complicated. On older estates, the original framing often can’t carry the extra weight of a triple-glazed unit without reinforcement. We’ve opened up walls off Chateau Drive and found undersized headers that a previous contractor never flagged. Our team checks framing before we quote triple-pane, because a structural upgrade found after the contract is signed is exactly the kind of surprise that blows up a budget. We write allowances into the contract for that reason.
UV-Blocking & Fade Protection
Hillsborough homes are full of heirloom furniture, oriental rugs, and original woodwork. The afternoon sun on exposed hillside lots, especially on west-facing facades along the higher elevations, fades fabric and flooring faster than homeowners expect. UV-blocking glazing cuts UV transmission without darkening the room like old tinted film. We’ve matched UV-blocking glass to original divided-lite patterns so the view stays clear and the rug keeps its color.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Hillsborough
We’re an authorized installer for more than a dozen manufacturer lines, and for Hillsborough’s older estate homes we lean on brands that build true divided lite, custom steel-look profiles, and period-correct hardware: PGT, CGI, and ES Windows among them. When we quote, we put the manufacturer lines side by side on paper so you can compare glass packages, frame profiles, and warranty terms without wading through websites. We know which lines the Design Review Commission has accepted on past Hillsborough projects, and we’ll tell you plainly if a certain product will draw board pushback before you spend money on drawings.
Common Energy-Efficient Windows Problems We See in Hillsborough Homes
- Corroded steel casement hardware from Bay fog. Moisture-laden air off the Bay works its way into original steel frames, rusting hinges and locks until sashes won’t open. Replacement triggers design review, and we handle the drawings and board sign-off as part of the job.
- Wood rot accelerated by hillside moisture. Hillsborough’s terrain channels afternoon fog into low pockets where wood sills and frames stay damp. Rot hides behind paint until the seal fails and fog appears between panes. By then, the sash usually needs full rebuild or replacement.
- Undersized framing that can’t support modern insulated units. Many 1920s-1960s estate homes were framed for thin single-glazed glass. When a contractor slaps in a double- or triple-pane unit without checking the header, the wall sags and the sash binds. We open the cavity and check before we quote.
- Design Review Commission stop-work orders. A Hillsborough homeowner who replaces windows without board approval can get a stop-work order and a forced permit revision. We’ve pulled enough of these permits to know what the Town will ask for on a Spanish Revival, Tudor, or Mediterranean facade.
Pricing for Energy-Efficient Windows in Hillsborough, CA
Energy-efficient window work in Hillsborough runs on a different scale than a standard tract-home replacement. A custom low-E argon-fill insulated glass unit sized to an original steel casement typically runs $1,200 to $2,800 per window including fabrication, finishing, and trim work. Full replacement of an original wood sash with a period-matched ENERGY STAR unit runs $2,500 to $5,500 per opening, depending on whether Design Review requires stamped drawings and whether framing reinforcement is needed. Triple-pane on an older home with structural upgrades can push $4,000 to $7,500 per window. We give a free estimate with line-item pricing in writing, and our Done Right Promise means if something isn’t right after install, we make it right without paperwork fights. Call (888) 635-0804 to schedule yours.
We Also Serve Cities Near Hillsborough
Our Energy-Efficient Windows team works throughout the Peninsula and nearby areas, including Parkway, Arden-Arcade, Ladera Heights, and Commerce. If you’re outside Hillsborough but nearby, call (888) 635-0804 and we’ll tell you straight whether we cover your street. This page is written for Energy-Efficient Windows in Hillsborough, but the same craftsmanship applies wherever we work.
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 - Energy-Efficient Windows in Hillsborough
The Design Review Commission typically adds three to eight weeks to a window replacement on an older Hillsborough estate home, because stamped architectural drawings and board sign-off are required before a building permit is issued. We handle the drawings and submittal for you, and we’ve built relationships with architects and engineers who work with the Town regularly. Call (888) 635-0804 to find out if your specific project triggers review, since some replacements on non-street-visible elevations can move faster.
Yes, it’s done regularly in Hillsborough by cutting custom low-E argon-fill insulated glass units into the original steel frames and matching the original multi-pane look with period-correct hardware. The Design Review Commission will want to see that the replacement matches the original sightlines and profile. On a 1920s Spanish Colonial Revival estate off Chateau Drive, we restored the frames, installed custom low-E argon-fill units, and matched the steel look with period-correct hardware without tripping a stop-work order from the Town.
Hillsborough’s hillside terrain channels afternoon marine fog and moisture-laden air from the Bay into low pockets where wood sills and frames stay damp longer than in more fog-shielded inland Peninsula towns like Atherton. That persistent moisture accelerates rot and corrodes original steel hardware. If you see peeling paint or soft wood at the sill, call (888) 635-0804 for an inspection before the damage spreads into the framing.
You should expect outdated wiring, undersized or damaged framing, and failed waterproofing once walls are opened on a 1920s-1960s estate home, and a building permit often triggers code upgrades for whatever is exposed. We handle this by inspecting first, writing allowances into the contract for known risks, and pricing any surprise in writing before we touch it. That’s the single biggest reason a Hillsborough window quote moves upward mid-project, and we’d rather tell you on the front end than surprise you later. Call (888) 635-0804 for an exact quote that accounts for your home’s specific construction.
Fog between panes means the seal has failed and the insulating gas has escaped, but it does not always require full window replacement. In many Hillsborough homes, we can replace just the insulated glass unit and keep the original frame intact. If the frame itself is rotted or the sash is beyond repair, full replacement makes more sense. Call (888) 635-0804 and we’ll inspect the unit and tell you which path fits your home and your budget.
Call (888) 635-0804 to schedule your free estimate for energy-efficient windows in Hillsborough. We’ll measure every opening twice, explain the Design Review process if it applies, and give you a written line-item quote with both warranty layers registered in writing before our truck leaves your driveway.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Hillsborough since 2008.