Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
Fast, Reliable Window Installation Across Sebastopol
Window installation in Sebastopol usually means working on older wood-framed homes, rural county parcels, or both. The wet, fog-heavy climate here rots sills and fogs glass faster than homeowners expect. We work in Sebastopol every week, know the difference between city and county permitting, and quote the job once with the details on paper. Call (888) 635-0804 to schedule a free estimate. We’ll walk the property, measure every opening twice, and give you a line-item quote before any work starts.
Why TruePane Windows & Doors Is Sebastopol’s Preferred Window Installation Company
TruePane has been installing windows in Sonoma County since Dale Kessler founded the company in 2008, building on a glazing tradition that goes back many years. Dale still runs the board the way a second-generation tradesperson does: if the pane is not true, the job is not done. That rule matters in Sebastopol, where the coastal moisture from Bodega Bay works its way into every window opening and punishes shortcuts.
We’re not a franchise. We hire local people, train apprentices into journeymen, and background-check every technician who steps onto your property. Sebastopol homeowners tell us the same thing again and again: they’ve been burned before by a crew that measured wrong, left a warranty unregistered, or disappeared when the fogged glass showed up a year later. Our Done Right Promise puts the response in writing. If something isn’t right, we come back and make it right. No paperwork fight, no arguing about who measured what.
Dispatch and scheduling are coordinated from our San Francisco Bay Area office, and crews serve Sebastopol locally. When you call (888) 635-0804, a live person answers. 24 hours a day, 7 days a week. Not a voicemail tree, not a callback form.
Our Window Installation Services in Sebastopol
Sebastopol’s housing stock spans late-Victorian and Craftsman bungalows near downtown, mid-century ranches, and rural homes on former Gravenstein orchard land. Each requires a different installation approach. Here are the window types we install most often across the 95472 ZIP.
Casement Windows
Casement windows crank outward on side hinges, which makes them a strong choice for Sebastopol’s wet winters. A properly set casement seals tighter than a sliding sash because the hardware pulls the sash against the weatherstripping. On rural parcels near the Laguna de Santa Rosa floodplain, where groundwater wicks up through subfloor framing, we pay extra attention to the rough opening before the window goes in. A casement set into a rotted opening will bind within a season. We rebuild the opening first, flash it correctly, then set the window true.

Awning Windows
Awning windows hinge at the top and open outward, which lets you vent a bathroom or kitchen during Sebastopol’s damp mornings without letting rain blow in. They work well in the older Craftsman bungalows near downtown, where full-height casements may not fit the original framing. Awning units are also a practical choice for high-wall placements above sinks or counters.

Fixed & Picture Windows
A fixed window does not open. It exists to hold a view and let in light. On Sebastopol properties that look out over open pasture or former orchard land, a large picture window is often the centerpiece of the living room. The failure we see most often here is seal failure. Persistent fog and condensation accelerate argon loss in insulated glass units, and a picture window that fogs within five years was almost always a poor-quality unit or a bad install. We stock manufacturer lines including PGT and CGI and register both warranty layers before we leave your driveway.

Single & Double Hung
Single-hung and double-hung windows are common in Sebastopol’s mid-century ranches and older Craftsman homes. The challenge in this climate is wood swelling. Wet winters cause sashes to stick or bind, especially on the original double-hungs in the 1900s-1930s bungalows near downtown. If the jamb pockets are still sound, we can sometimes repair and re-route them. More often the frame itself has rot, and a full-frame replacement is the honest answer. We’ll show you both options on paper.

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 Sebastopol
We are an authorized installer for more than a dozen manufacturer lines, including PGT, CGI, and ES Windows. That matters in Sebastopol because the wrong glass package will struggle with the marine layer that sits over town most mornings. We quote manufacturer lines side by side on paper so you can see exactly what you are buying. Both warranty layers get registered in writing before the truck leaves the driveway. If you call us with a warranty question three years later, a live person picks up and we pull your file.
Common Window Installation Problems We See in Sebastopol Homes
- Seal failure from chronic coastal moisture. The fog that funnels inland from Bodega Bay keeps condensation on glass longer than in Santa Rosa or Petaluma. Insulated glass units lose argon faster, and windows fog within years instead of decades.
- Sill rot from below. On low-lying parcels near the Laguna floodplain, groundwater migrates up through subfloor framing and rots door thresholds and window sills from the inside out. A contractor who only treats the visible exterior surface misses the real problem.
- Binding sashes on older Craftsman double-hungs. Wet winters cause wood swelling. Sashes stick, jam, or refuse to close by October. Sometimes a jamb pocket repair fixes it; sometimes the frame has to be replaced.
- Rotted rough openings hidden behind trim. We regularly pull old windows in Sebastopol and find the framing behind them is soft. If we set a new window into a compromised opening, the warranty means nothing. We rebuild before we install.
Building on Acreage Around Sebastopol: What Actually Changes the Price
Sebastopol is not Santa Rosa. A lot of the window work we do here happens on unincorporated county parcels, not city lots. That changes the job in ways a generic installer may not anticipate.
First, permitting. Many rural Sebastopol window replacements on county parcels go through Sonoma County’s PRMD instead of the city building department. When a bedroom egress window changes size, we have to verify septic and well setbacks before anything gets ordered. A window that enlarges an opening can trigger clearance requirements from the septic leach field or the wellhead. We handle that verification before quoting, so the number on your estimate is the number you pay.
Second, access and logistics. Former orchard parcels off roads like Bloomfield Road often have long gravel driveways, soft shoulders, and limited turnaround space. Equipment hauling takes longer. We scope that during the free estimate and account for it in the line-item quote. No surprise line items appear later.
Third, outbuildings. Many Sebastopol acreage properties have detached shops, barns, or ADUs with their own window needs. Grading and drainage on an open lot affects how water moves around a foundation, which affects how we flash and seal every opening. We quote the main house and any outbuildings separately so you can see where the dollars go.
On a former Gravenstein orchard parcel off Bloomfield Road, our crew replaced a fogged picture window and a sticking double-hung in a 1970s ranch. We found the jamb swelling from groundwater wicking up through the subfloor near the Laguna floodplain. We pulled the sill, installed flashing tape, and rebuilt the rough opening before setting the new fused-welded casement and low-E argon-filled unit. The homeowner has not had a sticking window since.
Pricing for Window Installation in Sebastopol, CA
Sebastopol window installation pricing depends on the window type, the frame condition, and whether the property is on city or county land. Here are the ranges we typically quote in the 95472 ZIP:
- Casement window replacement: $850-$1,600 per window, installed.
- Fixed or picture window (standard size): $700-$2,000 per window, depending on glass package and size.
- Single or double hung (full-frame replacement): $900-$1,800 per window, including rot repair at the opening.
- Full-frame replacement with rough opening rebuild: add $200-$500 per opening when framing is rotted.
County permit fees for Sebastopol-area rural parcels run separately and depend on PRMD review scope. We line-item those on the quote. The free estimate covers measurement, site access review, and the written quote. Call (888) 635-0804 to schedule yours.
We Also Serve Cities Near Sebastopol
TruePane handles window installation for homeowners across western Sonoma County. If you’re in Santa Rosa, Rohnert Park, Cotati, or Windsor, we work there too. Our Window Installation in Sebastopol page covers the rural county parcels, while our Window Installation team brings the same Keystone Standard to every job across the region.
Serving Sebastopol, CA - Our Local Coverage Area
We’re based in the Sebastopol 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 - Window Installation in Sebastopol
Most window replacements on unincorporated Sonoma County parcels require a permit through PRMD, and size changes matter. If you are enlarging a bedroom egress window, septic and well setback requirements may apply. A straight same-size replacement is simpler. We verify setback requirements before quoting so there are no surprises. Call (888) 635-0804 for an exact answer on your parcel.
Sebastopol sits in Sonoma County’s marine fog belt, and the persistent coastal moisture from Bodega Bay makes the 95472 ZIP measurably damper than Santa Rosa just seven miles east. That chronic moisture accelerates wood rot at sills, thresholds, and exterior frames. On low-lying parcels near the Laguna floodplain, groundwater can also wick up through subfloor framing and rot sills from the inside out. The fix is proper flashing, sill pan repair, and sometimes full-frame replacement.
Yes, it is common in Sebastopol’s older Craftsman bungalows. Wet winters cause wood swelling, and sashes bind in the jamb pockets. If the pockets are still sound, we can sometimes repair and re-route them. If the frame has rot, a full-frame replacement is the honest fix. We’ll show you both options and the price difference on paper.
Former orchard parcels and rural lots bring county permitting, septic and well setback verification, longer material hauls, and open-lot drainage considerations. Outbuildings like shops and detached ADUs add separate line items. We scope all of that during the free estimate so the quote reflects the real job, not a generic city-lot price.
Yes. We regularly replace original double-hung and casement units in Sebastopol’s 1900s-1930s Craftsman homes with modern units that hold the period look. We keep muntin profiles and sightlines close to the original and use low-E argon-filled glass to meet current Title 24 energy standards. Call (888) 635-0804 and we’ll bring samples to your house.
Written by Dale Kessler, Owner at TruePane Windows & Doors, serving Sebastopol and western Sonoma County.



Before
After
Before
After
Before
After