How to File a Window Warranty Claim in LA (Install Warranty vs Manufacturer Warranty)
Every properly installed window carries two warranties: the manufacturer's product warranty (glass seal failures, hardware defects, finish delamination) and the installer's workmanship warranty (air/water infiltration, racking, flashing failures). Most homeowners contact the wrong party first and lose weeks. Route the claim correctly on day one: manufacturer warranty claims go directly to Milgard, Marvin, Andersen, or Anlin; install warranty claims go to your installer in writing. Have your original invoice, permit record, and photos ready before you call anyone.
There are two warranties on every properly installed window: the manufacturer's product warranty and the installer's workmanship warranty. They cover different things. The manufacturer's warranty covers the product — glass seal failure, hardware defects, finish delamination, screen defects. The installer's workmanship warranty covers how the window was put in — flashing, sealing, anchoring, shimming, the frame-to-wall connection.
Most homeowners contact the wrong party first. A failed glass seal (condensation between panes) is a manufacturer claim, not an installer claim — but the installer is the local number the homeowner has. That's not a problem when we're the installer; we sort it out. The problem is when the homeowner has spent two weeks going back and forth with the wrong party before anyone points them in the right direction.
This guide tells you how to route a claim correctly on day one — what each warranty covers, what documentation you'll need, and the exact steps for filing either type. We also cover what to do if your installer goes dark, because in LA that happens more than it should.
Two warranties, two failure modes. Know which one you have.
- 1Manufacturer warranty: insulated glass unit seal failureCondensation or fogging between the panes means the inert-gas seal has failed and the IGU needs replacement. This is a product defect — it goes to the manufacturer, not the installer. Most major brands (Milgard, Marvin, Andersen, Anlin) cover this for the life of the original owner under their standard warranty.
- 2Manufacturer warranty: hardware defectsOperators, locks, sash balances, and tilt latches that fail under normal use are hardware defects covered by the manufacturer. If a casement operator stops functioning at year 4 with no visible physical damage, that's a product warranty claim — call the manufacturer, not the installer.
- 3Manufacturer warranty: finish delamination or fading outside normal weatheringFactory-applied exterior finishes that peel, chip, or blister significantly faster than the warranty term are a manufacturer defect. Normal weathering — gradual color shift over 15–20 years of LA sun on vinyl — is not. Most manufacturers define 'premature' failure in the warranty language.
- 4Manufacturer warranty: screen defectsFactory-installed screens with frame warp, mesh separation, or hardware failure within the warranty period are covered by the manufacturer. Screens damaged after install — physical impact, animal damage — are not.
- 5Install warranty: air infiltration from the frame-to-wall connectionDrafts coming from the perimeter of the window frame — not through the window itself — point to the frame-to-wall connection, which is the installer's responsibility. Gaps in the sealant bead, missing backer rod, or inadequate foam fill at the rough opening are workmanship issues, not product defects.
- 6Install warranty: water infiltration at sill, head, or jambsWater coming in around the window — at the interior sill, the top (head), or the sides (jambs) — is almost always a flashing or sealing failure, which is the installer's domain. Water through the frame-to-wall joint is workmanship. Water through the window's drainage system may be a product issue.
- 7Install warranty: frame racking out of square post-installA window that becomes hard to operate, develops corner gaps, or shows daylight at the sash corners shortly after installation may have been shimmed incorrectly or set in an unsquared rough opening. That's an installation defect. If a window operated correctly for years and then racked, that's likely structural settlement — a different conversation.
- 8Install warranty: any failure attributable to flashing, anchoring, or sealingHead flashing that wasn't properly lapped, anchor screws that pulled out of inadequate framing, sill pans that weren't sloped or weren't present — all workmanship. These failures often surface at the first hard LA rain after install. If water is coming in around the window within the first rainy season, that's ours to fix at no cost.
How to file a manufacturer warranty claim.
Five steps in order. Going out of sequence usually means starting over.
How to file an install warranty claim.
Four steps. The key difference from a manufacturer claim: your installer is the sole contact, and everything should be in writing from the start.
Get these together before you make the first call.
- 1Original invoiceShows date of installation, window specs (brand, series, model, size), contractor name and license number, and scope of work. If you can't find yours, ask the installer — they're required to keep records. We keep digital copies of every invoice going back seven years.
- 2Permit record or inspection cardIndependent proof the installation happened on a specific date and passed inspection. Available online through your city's building department portal — LADBS, Pasadena PDS, Burbank CDS. Search by address. If no permit exists for your installation, that's information worth having before you file anything.
- 3NFRC/model information from the window labelA sticker on the interior frame — usually at the sash corner or along the jamb — shows the NFRC rating, manufacturer model number, and sometimes a unit serial number. This is what the manufacturer uses to look up your unit's warranty status. If the sticker is gone, the invoice model number is your fallback.
- 4Photos of the failure with date metadataModern phone photos embed the capture date in the file. Take photos without editing them — the unaltered metadata is useful if a claim is disputed. Shoot wide to show the window in context and close to show the specific failure point.
- 5Warranty registration number (manufacturer claims)Your registration number speeds up manufacturer claims significantly. Check your email for a confirmation from the manufacturer around install time. If you don't have it, the manufacturer can look you up by address and date, but it takes longer. We send every customer their registration confirmation within 48 hours of final inspection.
Your options when the installer goes dark.
LA has a contractor attrition problem. Companies active during a boom year aren't always around two years later, and even active contractors sometimes stop returning warranty calls. Here's the escalation ladder.
CSLB license bond. Every California licensed contractor must carry a license bond — minimum $15,000. The bond covers homeowners for installation defects and contract violations. File a complaint at cslb.ca.gov with the contractor's license number (on your original invoice). If the complaint is substantiated, the bond covers repair costs up to the bond amount. This is your first move if the contractor is licensed but unresponsive.
CSLB Arbitration Program. For disputes up to $50,000, the CSLB offers binding arbitration without attorneys — faster than small claims for larger amounts and designed specifically for contractor disputes. Initiate it through the same cslb.ca.gov process.
Small claims court. For amounts under $12,500, small claims is the most direct path. No attorney required, low filing fees, hearings typically scheduled within 30–70 days. Bring your invoice, permit record, photos, and a written repair estimate from a second contractor.
BBB arbitration for manufacturer disputes. If the manufacturer is denying or slow-walking a valid warranty claim, both Andersen and Marvin participate in BBB arbitration programs. File at bbb.org with your warranty registration number. Not every manufacturer participates, but it's a useful lever for the brands that do.
How to keep both warranties active after the install.
- 1Don't paint over weep holesThe weep holes at the bottom exterior of the window frame drain any incidental water from the sill track. Painting over them — a common mistake when repainting the exterior — traps water inside the frame cavity and accelerates seal failure. If you're repainting, tape off the weep holes and clear them when the paint is dry.
- 2Clean tracks and hardware annuallyMilgard, Anlin, and most manufacturers require basic maintenance — track cleaning, hardware lubrication — to keep the warranty active. The standard is mild soap and water on tracks, a light silicone spray on hardware. Avoid petroleum-based lubricants on vinyl frames — they degrade the seal material. Annual maintenance is a 30-minute job that keeps the manufacturer from citing 'lack of maintenance' when a hardware defect shows up at year 7.
- 3Don't modify the window after installationAdding film coatings (solar film, privacy film) or external attachments (security bars, exterior roller shutters) without written manufacturer approval can void the warranty. Unauthorized modifications are the most common reason manufacturers decline hardware and seal claims. If you want to add film, call the manufacturer first and get the approved product list in writing.
- 4Inspect sealant at the exterior perimeter every 2–3 yearsThe exterior sealant bead between the window frame and the wall is a consumable — it has a 15–20 year lifespan when installed with backer rod, shorter if foam-only. Walk the exterior and press the sealant lightly. If it's hard, cracked, or pulling away from the frame, it needs replacement before water gets in. Re-caulking the perimeter is a homeowner maintenance task; what's underneath (flashing, backer rod) is the installer's responsibility if the joint was built incorrectly.
- 5Report issues promptly — don't wait a full seasonIf you notice a small air draft or a slow fogging in one corner of a pane, report it in writing within 30 days. Small failures that are easy to diagnose and fix become large, ambiguous failures when water has been working behind the frame for six months. Early reporting also protects you: a claim filed at 3 months is much easier to attribute to workmanship or product than one filed at 18 months after unknown accumulation.