Window Installation in San Francisco - Free Measure, Exact Written Quote

Trusted Window Installation for San Francisco Homeowners

Window installation in San Francisco is rarely a straightforward swap. Fog rolls in, salty air works on seals, and older Victorians and Edwardians settle in ways that make a new frame fight the opening. We handle that. Since 2010, Lightwell Windows has installed windows across San Francisco neighborhoods from the Richmond to Bernal Heights, and we plan every job around how this city’s microclimates and architecture actually behave. A live person answers at (831) 480-4124 whenever you want to talk through what you’re seeing. The written price comes before anything gets touched, and the 365-Day Done Right Promise stays on the job long after the crew leaves.

Call (831) 480-4124

How Much Does Window Installation Cost in San Francisco?

Casement Windows

Casement windows are hinged at the side and crank outward, which makes them the best choice for San Francisco’s wind corridors and the tightest seal against fog-driven moisture. When a home in the Richmond or the Marina has windows that leak air every time the wind picks up off the Pacific, a well-installed casement with a full compression seal fixes it. Lightwell Windows San Francisco installs casement windows from ECO Window Systems and other brands in our lineup, and a typical casement replacement runs $1,100 to $1,700 per opening in San Francisco, including removal of the old unit and new interior and exterior trim where needed.

Why the crank makes all the difference

Cranking a window shut pulls the sash against the frame evenly on all four sides. That is what gives a casement its air and water seal, and it’s why we check the crank mechanism, hinges, and weatherstripping on every install. A geary crank that binds or a hinge that is a millimeter out of alignment will leak, no matter how good the window itself is.

Where casements earn their keep

Kitchens over sinks, hallways, and any opening where you want full ventilation without a center rail blocking the view. In San Francisco’s older homes, casements also let us work with narrower rough openings where a double hung would look squeezed.

Double Hung Windows

Double hung windows have two sashes that slide vertically, so you can open the top, the bottom, or both. They are the most common window style in San Francisco’s Victorians and Edwardians, and when they stop staying up, start rattling, or have gaps where the sashes meet, replacement is usually the right move. Lightwell Windows San Francisco installs double hung windows from Mr-Glass and other manufacturers, and a standard vinyl double hung runs $850 to $1,400 per opening, while wood-clad units sit closer to $1,300 to $1,900 depending on size and finish.

The balance and tilt problem

Old double hungs in San Francisco fail in predictable ways: sash cords snap, spring balances lose tension, and the tilt pins wear until the sash drops on your fingers. We replace the full unit rather than patching a 90-year-old frame that has already moved past square. The new sash tilts in for cleaning from inside, which matters when the window is over a busy street or three floors up.

A note on upstairs openings

When we install upstairs double hungs, the crew protects the stairwell and any furniture along the path with drop cloths and shoe covers. Pets stay safe because we ask before moving anything and we close doors behind us so a curious dog or cat does not wander into the work area.

Vinyl Windows

Vinyl windows are the practical choice for San Francisco homeowners who want good thermal performance and easy maintenance without spending on wood or aluminum-clad frames. The material, a PVC-based extrusion, will not rot in the coastal damp, does not need painting, and holds up to the salt air better than raw wood. Lightwell Windows San Francisco installs vinyl windows from ViewLux and other brands, with most vinyl replacements in San Francisco running $850 to $1,400 per opening.

The salt-air reality

Homes in the Sunset, the Richmond, and anywhere within a mile of Ocean Beach get more salt exposure than the rest of the city. Vinyl’s advantage is that it will not pit or corrode the way some metal frames do. We still recommend stainless or coated hardware on any vinyl window installed near the coast, because the hardware is the failure point, not the frame.

What “vinyl” actually gets you

Multi-chamber extruded frames trap air inside the frame itself, which helps a little with insulation. The bigger win is that vinyl expands and contracts less than aluminum, so the seal around the glass stays put through San Francisco’s temperature swings. For homes with older aluminum single-pane windows, a vinyl replacement is usually the most cost-effective comfort upgrade available.

Picture Window

Picture windows are fixed, non-operating windows built to frame a view, and San Francisco has views worth framing. The problem in older homes is that a picture window from the 1960s or 1970s is often a single pane with no thermal break and a frame that has shifted enough to let moisture behind the interior wall. Lightwell Windows San Francisco installs picture windows from ECO Window Systems and other manufacturers, with a typical replacement running $900 to $1,800 per opening depending on glass area and whether the old frame needs re-flashing.

Glass matters more than the frame

A picture window is mostly glass, so the glazing spec does the real work. For west-facing picture windows in the Sunset or Richmond, we recommend low-emissivity coatings that cut heat gain while preserving the view. At a minimum, every picture window we install in San Francisco gets a thermal break and an insulated glass unit, because single-pane picture windows are the largest cold surface in a room.

When a picture window also needs structure

Large picture windows carry more weight than the wall around them sometimes can. When we find a sagging header or a sill that has rotted from years of condensation, we address the framing before we set the window. The written price you approve early on covers that conversation, and nothing structural ever comes as an end-of-job surprise.

Bay Window Installation

Bay window installation replaces a projecting window assembly, usually with three or more panels that angle out from the exterior wall. These are the most structurally demanding window jobs in San Francisco, because a bay window is part window, part roofline, and part load-bearing structure. Lightwell Windows San Francisco installs complete bay window assemblies, and a full replacement in San Francisco runs $3,200 to $7,500 depending on size, support condition, and roofing finish. If the bay is on an upper floor or a hillside home, the access scaffolding shapes the final price.

The roof and the knee braces

A bay window that leaks is rarely leaking through the glass. The metal roof cap above the bay, or the knee braces below it, are the usual culprits. We inspect every bay’s roof membrane and support brackets before quoting, because replacing the glass without fixing the roof means water comes back within a season or two.

Keeping the inside livable

Bay window installation is dusty work. The crew at Lightwell runs drop cloths from the entry to the opening, covers the furniture, and vacuums before taking a photo of the cleaned work area. Kids and pets are kept out of the path, and we ask before moving anything in the room, following the C.A.R.E. values the crew carries on every visit.

Window Contractor

A window contractor is the licensed professional who manages the whole installation, from removing the old window and preparing the opening to setting the new unit, flashing it, trimming it, and hauling away the debris. In San Francisco, that contractor also needs to understand local requirements around energy codes, lead paint on pre-1978 homes, and the structural quirks of hillside foundations. The team at Lightwell Windows San Francisco, led by Keith Yamada, has been doing this work since 2010, and every job carries the 365-Day Done Right Promise in writing.

The difference between a quote and a contract

A real window contractor gives you a written, line-item price before any work starts. That means the number you approve is the number you pay, and if we find rot or framing problems behind the old window, we stop, show you what we found, and give you a revised price before proceeding. No change orders on the last day, no invoice that looks nothing like the estimate.

What to look for in a San Francisco window contractor

Ask whether the contractor’s installers are employees or day laborers picked up that morning. Lightwell sends background-checked, uniformed technicians who have worked together as a crew. Ask whether the contractor pulls permits where the city requires them. We do. Ask what happens if the finished work is not right. Our answer is the same every time: we make it right, no debate, for 365 days after the install.

Window Installers

Window installers are the people who do the physical work: removing the old sash and frame, preparing the rough opening, setting the new window level and square, insulating and sealing around it, and reinstalling trim. The quality of the installation matters as much as the quality of the window itself, because a great window installed out of square will still leak. Lightwell Windows San Francisco sends background-checked, uniformed installers to every job, and they follow the C.A.R.E. values on site: Clean up like it is our own home, Ask before we move or touch anything, Respect the family’s time and quiet hours, Explain the price before the work.

Nap time and quiet hours

If there is a baby sleeping or a toddler on a nap schedule, tell us. Our installers will sequence the loudest work, like cutting out the old window or running the multi-tool, around those hours where it is physically possible. We cannot make a window install silent, but we can respect a sleeping household in a way few crews will even try.

Pet-safe products where there is a choice

Caulks and sealants off-gas during curing. When alternatives exist, Lightwell installers use low-VOC or pet-safe products, and they keep doors closed and drop cloths down so a dog or cat does not walk through wet sealant. If your pet is anxious around strangers, we will work with you on which room to start in and when to expect us in each space.

Brands We Service

We carry ViewLux vinyl windows for San Francisco’s salt-air neighborhoods and for homeowners who want straightforward, low-maintenance performance. ViewLux frames hold up in the fog belt, and we are familiar with their hardware and installation specs, which means fewer surprises in the rough opening.

ECO Window Systems covers the range from impact-rated to high-efficiency glazing, and we install their windows on homes where the exposure is harsh or the homeowner wants the best thermal numbers available. Mr-Glass rounds out the aluminum and vinyl options we recommend for retrofit projects where the existing opening is not square and needs a flexible frame system. Therma-Tru is our go-to for exterior doors rather than windows, and we service their installations regularly as part of the Cedarwell network. Whether you have one of these brands already or something else entirely, we can help.

Signs You Need a Pro Right Now

• Windows that fog between the panes. A failed insulated glass unit has lost its seal, and the fog will not go away. It means the window no longer insulates, and in San Francisco’s damp climate, it is a sign the unit has been taking on moisture for a while.
• Water stains on the wall or floor under a window. That stain is not always from a leak in the glass. It often means the flashing, the sill, or the rough opening is letting water in, and that water is reaching the framing. In the Sunset or the Richmond it happens slowly for years before it becomes obvious.
• Windows that will not open or refuse to stay open. When a double hung drops on its own or a casement crank grinds, the hardware or the frame has moved past service. Forcing it risks the glass or your fingers.
• Drafts you can feel with the window closed. Cold air moving around a closed sash means the weatherstripping or the frame has failed. It is not subtle in San Francisco’s windy afternoons, and it is driving your heat bill up.
• Soft or crumbling wood around the window frame. If the sill or the lower corners of the frame feel spongy, rot is already there. The window is not sealing, and the structure is slowly degrading. A pro should look before the repair grows.

Our Process, Step by Step

1. 1
   The walkthrough and written estimate. We visit the home, look at every window in question, and measure each opening. We check for rot with a moisture meter, look at the level of each frame, and note any lead paint or access issues. Then we hand you a written, line-item price for the full job.
2. 2
   Ordering and scheduling. Once you approve the written price, we order the windows to the exact measurements. Keith Yamada confirms every order against the field measurements before it goes to the manufacturer, because a window ordered a half-inch wrong is a window that does not fit.
3. 3
   Prep and protection on install day. The crew arrives in uniform, lays drop cloths from the entry to the work area, and puts on shoe covers. We ask before moving furniture or wall hangings, and we confirm the quiet-hours plan if there are kids or pets in the house.
4. 4
   Removal and installation. The old window comes out carefully enough that we can see what the rough opening looks like. We address any rot or framing issues with your sign-off, then set the new window level and square, insulate the gaps, flash the exterior properly, and replace the trim.
5. 5
   Clean-up, walkthrough, and photo. We vacuum the work area, wipe down surfaces, and take a photo of the clean-up before we leave. Then we walk you through the finished windows, show you how they operate, and leave you with the warranty details and our number. You get a copy of everything in writing.

Our Service Area Near San Francisco

Lightwell Windows San Francisco installs windows across San Francisco and the East Bay. Our primary coverage includes Berkeley, Daly City, South San Francisco, Burlingame, and the Peninsula, with regular work in Oakland, Piedmont, San Leandro, Walnut Creek, and Martinez. For larger jobs we also serve Castro Valley and Danville. A live person answers at (831) 480-4124 and can tell you when we can be at your door. We plan routes to keep our San Francisco response times short, and we will confirm a specific arrival window before we come out. If you are comparing window contractors across the Bay, see our pages on Window Installation in Castro Valley and Window Installation in Danville for local specifics in those markets.

Frequently Asked Questions About Window Installation in San Francisco

Schedule Your Window Installation Service in San Francisco Today

Call (831) 480-4124 and tell us what is going on with your windows. We will schedule a free walkthrough, measure every opening, and give you a written price before any work starts. Keith Yamada and the crew at home quality window installation in San Francisco treat every house like a living home, not a job site, and the 365-Day Done Right Promise backs every install. The estimate costs nothing and comes with no obligation.

Written by Keith Yamada, Owner at Lightwell Windows San Francisco, serving San Francisco since 2010.