A home inspector evaluates windows and doors for seal failure (the foggy look of a blown dual-pane), operation, weatherstripping, water intrusion, egress in bedrooms, and security of locks and latches. In San Diego, coastal salt air and a mix of building eras make these everyday components surprisingly telling about a home’s condition.
Windows and doors get overlooked because they seem cosmetic. They are not. They are part of the building envelope, a safety system, and often the first place where deferred maintenance or hidden water problems show up. Here is what a careful inspection covers across San Diego County’s range of housing.
Dual-pane seal failure: why windows fog up
Most San Diego homes built or re-windowed since the 1980s have insulated glass units (IGUs) – two panes of glass with a sealed air or gas-filled space between them. That seal is what makes the window energy-efficient. When it fails, moisture works its way into the cavity and you get the telltale haze, cloudiness, or visible condensation between the panes that you cannot wipe away.
Seal failure is common and rarely an emergency, but it matters for two reasons. First, the window has lost much of its insulating value, so it costs more to heat and cool. Second, a foggy window is a clue about age and exposure – if several units have blown, the rest of that vintage may not be far behind. We document each affected window because, on a sizeable home, replacing one or two glass units is minor while replacing twenty is a real budget line.
Fogging is easiest to spot in certain light, so the time of day during an inspection can affect what is visible. A west-facing wall that looks clear at 9 a.m. may show haze in afternoon sun. Thermal imaging can also flag temperature differences around failed or poorly insulated glazing, and around drafty frames, that the naked eye misses.
Single-pane glass in older San Diego homes
Plenty of San Diego’s housing stock predates dual-pane standards – Craftsman bungalows in North Park and South Park, mid-century homes in Clairemont and Allied Gardens, older cottages near the coast. These often still have original single-pane windows, sometimes with wood sash and weight-and-pulley mechanisms, sometimes early aluminum.
Single-pane glass is not a defect by itself, and original wood windows can be beautiful and repairable. What we look for is condition and function: cracked or broken panes, dried or missing glazing putty, painted-shut sash, rot at sills and lower rails, and failed sash cords. In a designated historic property the original windows may be worth preserving rather than replacing, which is a different conversation than a 1990s tract home. If you are buying an older or character home, our guide to inspecting historic San Diego homes goes deeper on what to expect and where original materials are worth keeping.
Coastal corrosion of frames and hardware
If the home is anywhere near the ocean – Ocean Beach, Pacific Beach, La Jolla, Encinitas, Coronado, Imperial Beach – salt air is a constant, low-grade attack on metal. We see it across coastal North County, which is why an Encinitas home inspection often turns up corrosion that an inland home of the same age simply does not have.
- Aluminum window frames can develop white, chalky oxidation and pitting, and rollers and tracks on sliders seize up.
- Window and door hardware – locks, latches, hinges, lever sets – corrodes and stops engaging smoothly, which is both an annoyance and a security issue.
- Steel components and fasteners rust, staining frames and weakening attachment.
- Garage and exterior door hardware takes the brunt of salt-laden fog.
None of this means a coastal home is a bad buy – it is the cost of living near the water. It does mean hardware and weatherstripping are maintenance items on a faster clock here, and a fresh-buyer should budget for ongoing upkeep rather than expecting set-and-forget windows.
Egress: the safety check that matters most
The single most important window question is not energy – it is escape. California requires bedrooms to have an emergency egress opening: a window (or door) large enough and low enough for an occupant to get out, and for a firefighter to get in, during a fire. The specifics on minimum opening size and sill height are spelled out in the building code, and requirements have changed over the years, so an older home may not match current standards.
During an inspection we note bedrooms where the window appears too small, painted or screwed shut, blocked, or where bars lack an interior quick-release. Egress is exactly the kind of finding that should shape your decision, so verify any concern with a licensed contractor or your local building department before assuming a window meets code – we will tell you when something looks short, but final code determinations belong to the authority having jurisdiction.
Weatherstripping, drafts, and energy
San Diego’s mild climate hides energy waste, but you still feel it as drafts, hear it as street noise, and pay for it on the bill. We check weatherstripping at operable windows and exterior doors, look at door sweeps and thresholds, and note daylight visible around a closed door (a sign the seal is gone). Gaps around frames can also be a water-intrusion path during the winter rains and Santa Ana-driven wind events, so we look for staining, soft drywall, and prior repairs at the interior corners of windows and at door headers.
Sliding doors and large openings
Sliding glass doors are everywhere in San Diego – patios, decks, indoor-outdoor living. They are also one of the most-used and most-abused components in the house, and a common weak point for both energy and security. We check that the panel rolls smoothly without lifting off the track, that the latch engages, and that there is a secondary security measure such as a bar or pin, since the standard latch alone is easy to defeat. We also look at the track for standing water, debris, and corrosion, and at the head for signs the door has dropped. A heavy slider that takes two hands to move usually means worn rollers, a bent track, or both.
What an inspection can and cannot tell you
A general home inspection of windows and doors is a visual, operational review – we open and close a representative sample, document defects, and flag safety and water concerns. We do not perform destructive testing, certify energy performance, or guarantee that hidden seals will not fail next week. For full glass-unit replacement quotes, egress modifications, or historic window restoration, the right next step is a specialist or licensed contractor.
Windows and doors are a normal part of every buyer’s inspection we perform, and they often connect to bigger questions about a home’s age and upkeep. If you want more context before your inspection, see our San Diego home inspection checklist, our look at buying an older home in San Diego, and the red flags that can become deal-breakers.
Have questions about a specific property, or ready to schedule? Reach The Real Estate Inspection Company at our contact page or call (619) 752-4399. Joseph Romeo, our owner and lead inspector, is an InterNACHI Certified Professional Inspector and a CSLB-licensed general contractor (License #1113143) serving all of San Diego County.
