What Fails a Home Inspection in San Diego? The Most Common Deal Breakers in 2026

You found the house. The offer went through. You're already thinking about where the couch goes. Then your agent says it's time to schedule the inspection, and suddenly you're up at midnight reading horror stories about foundation cracks and surprise mold.

We've been on the other end of that anxiety for over 25 years, performing more than 2,000 inspections across San Diego County. And here's what we tell every buyer before we start: knowing what to expect makes this whole process less stressful. The better you understand what inspectors actually look for (and what concerns them most), the better equipped you are to make smart decisions instead of just reacting to a long report.

Let's clear something up first. A home inspection doesn't technically "pass" or "fail." There's no letter grade. What the report does is identify material defects, safety concerns, and systems that are approaching the end of their useful life. You and your agent then decide what's acceptable and what isn't. That said, certain findings are serious enough that buyers walk away, renegotiate hard, or ask for major concessions.

Those are the deal breakers. And in San Diego, the answer to "what fails a home inspection" looks a little different than it does in the rest of the country, because the climate, soil, and building history here create a specific set of problems.

This guide covers the problems we encounter most often, what they cost to fix, how they affect your closing, and what you should do if your inspector flags them. Whether you're a first-time buyer trying to separate real red flags from cosmetic noise, or a seller wondering what your buyer's inspector is going to find, this is the post you need.

Roof Damage

Roof issues are one of the most frequent deal breakers we encounter across San Diego, even though the weather here feels mild compared to most of the country. The problem isn't rain or snow. It's sun. San Diego gets over 260 sunny days per year, and that constant UV exposure degrades roofing materials faster than most homeowners realize.

We see cracked and curling shingles, deteriorated flashing around vents and chimneys, and displaced tiles on the clay roofs that are so common in Carlsbad, Rancho Bernardo, and Encinitas. Flat roofs on mid-century homes in Clairemont, Pacific Beach, and Ocean Beach are especially prone to membrane failure and ponding water. And in hillside areas where wind exposure is higher, we often find lifted shingles and compromised ridge caps.

Here's what we flag most often and why it matters:

Issue	What We See	Why It Kills Deals
Curling or missing shingles	UV degradation, wind lift	Active leak risk
Cracked or displaced tiles	Settling, age, foot traffic	Water entry during rain
Deteriorated flashing	Corroded metal at penetrations	Number one source of roof leaks
Ponding on flat roofs	Poor slope, clogged drains	Membrane failure risk
Sagging roof deck	Moisture damage to sheathing	May need full replacement
Age past 20 years (asphalt)	Material lifespan reached	Insurance and lender concerns

A full roof replacement in San Diego runs $8,000 to $25,000 depending on size and material. That number changes negotiations fast, and it's one of the main reasons roof findings can stop a deal from closing. If the roof is old enough that the buyer's insurance carrier won't write a policy, the sale effectively stalls until it's resolved.

Foundation Cracks and Structural Issues

If roof problems are the most visible, foundation and structural findings are the most feared. And in San Diego, they happen more than the sunny weather might suggest.

The soil across the county varies dramatically. Large parts of inland San Diego (Escondido, Poway, El Cajon, Santee, Lakeside) sit on expansive clay that swells when it gets wet and shrinks when it dries. That cycle repeats year after year, and over decades it puts real stress on foundations. We see stair-step cracks in block walls, horizontal cracks in poured concrete, and diagonal cracks radiating from window and door corners. Doors and windows that don't close properly are often the first clue.

Not every crack is an emergency. Hairline cracks under 1/8 inch usually reflect normal settling, and most older homes have a few. But when cracks are wider than that, when one side sits higher than the other, or when we see a pattern of multiple cracks moving in the same direction, that's when we recommend a structural engineer get involved.

Hillside properties add another layer of risk. Homes in areas like Mt. Soledad, Mission Hills, Tierrasanta, and the hills of eastern El Cajon sometimes show evidence of slope creep, retaining wall failure, or lateral pressure against below-grade walls. These findings aren't always obvious from inside the house, but a trained inspector will check grading, retaining walls, and exterior drainage before stepping through the front door.

Foundation stabilization costs anywhere from $3,000 for minor underpinning to $30,000 or more for major work. That range, and the uncertainty about what's actually needed, is often what scares buyers the most. It's one of the findings that most frequently leads to a buyer exercising their contingency and walking away.

Electrical Panel and Wiring Problems

Electrical findings are a top concern for a straightforward reason: they create fire risk, and they can make a home uninsurable.

Older homes in San Diego (particularly in North Park, Normal Heights, Kensington, South Park, and parts of La Mesa) were built when electrical codes looked nothing like they do today. The biggest issue we encounter is the electrical panel itself. Federal Pacific Electric panels, installed widely during the 1960s and 1970s building boom across San Diego, have a documented history of breakers failing to trip during an overload. This isn't a theoretical risk. It's a known defect that has been linked to house fires. Many California insurance carriers flat-out refuse to write policies on homes with FPE panels.

Zinsco panels (sometimes rebranded as Sylvania or GTE-Sylvania) from the same era have a similar problem: breakers can fuse to the bus bar and become impossible to shut off. If your inspector identifies either panel type, expect it to become the central conversation in your negotiations.

Beyond panels, we regularly find ungrounded two-prong outlets in pre-1960s homes, aluminum branch circuit wiring in homes built from the mid-1960s through the mid-1970s, double-tapped breakers, missing GFCI protection in kitchens, bathrooms, and garages, and exposed or improperly spliced wiring in attics and additions (usually from DIY work that was never permitted).

Panel replacement typically costs $2,000 to $4,500. Rewiring an entire house runs $8,000 to $15,000. These numbers put electrical findings firmly in the category of issues that can affect financing, since some lenders won't fund a loan until known electrical hazards are corrected. And if the buyer's insurance company won't insure the home because of the panel, closing becomes impossible until it's replaced.

Plumbing and Sewer Line Failures

Plumbing is where San Diego's building history really catches up with buyers. A huge percentage of homes in this county were built between 1950 and 1985, and many still have their original drain lines and supply piping.

Inside the walls, we look for active leaks at fixtures and connections, water heater condition (age, strapping, venting), water pressure readings, and the type of supply piping. Galvanized steel supply lines are still present in many pre-1960s homes, and they corrode from the inside, slowly restricting water flow until it becomes a real problem. Polybutylene supply lines (gray plastic piping from the 1980s) are another concern because they're prone to sudden failure at fittings.

Underground is where the bigger money hides. Homes built before the mid-1970s in San Diego almost always have cast iron drain and sewer lines, and after 50 to 70 years of use, those pipes develop internal scale, cracks, root intrusion, and eventually full sections collapse. A sewer scope inspection is the only way to see what's actually happening down there, and we recommend one for any home older than 30 years.

We've covered the decision-making process around cast iron plumbing in detail on our blog.

Sewer line replacement runs $5,000 to $15,000 in San Diego depending on length, depth, and what's sitting on top of the pipe (patios, driveways, landscaping). Cast iron sewer decay is one of the most expensive single-item findings we report, and it's one of the most common reasons buyers come back to the table with a significant price reduction request.

A water heater that's past its 10 to 12 year lifespan, missing earthquake strapping (required by California code), or improperly vented will also make the report. Water heater replacement runs $1,200 to $3,500. Rarely a deal breaker on its own, but combined with other findings, it adds up.

Water Damage, Moisture, and Drainage

Water is the great destroyer of homes, and it doesn't need a storm to do the work. In San Diego, water damage usually comes from slow, quiet sources: a dripping supply line behind drywall, condensation in an unventilated bathroom, or landscape grading that sends rainwater toward the foundation instead of away from it.

Poor drainage around a home is more common than people expect in a "dry" climate. When soil slopes toward the house rather than away, water pools against the foundation, creates hydrostatic pressure, and over time can cause the kind of structural damage we covered above. We see this especially in older neighborhoods where original grading has settled, and in hillside areas where retaining walls have shifted.

Moisture problems are closely tied to mold. Coastal communities from Imperial Beach up through Del Mar, Encinitas, and Carlsbad deal with marine layer humidity every morning for months at a time. That persistent moisture, combined with poor ventilation, creates ideal conditions for mold growth in bathrooms, attics, garages, and under kitchen sinks. We wrote an entire guide on mold inspections in San Diego that covers testing, lab results, and when remediation is necessary.

Coastal properties also deal with salt air corrosion, which accelerates deterioration of exterior metal components, from electrical panels and HVAC units to flashing and fasteners. It's not something most buyers think about until the inspector points it out, but it has real cost implications for long-term maintenance.

Mold remediation costs range from $1,500 for a contained area to $10,000 or more if growth has spread through wall cavities or HVAC ductwork. Visible mold in a home changes negotiations quickly, and for good reason: beyond the health concerns, it signals an ongoing moisture source that needs to be fixed or the mold comes right back.

HVAC Systems

Heating and cooling findings don't always kill a deal, but they change the math. A furnace or AC unit that's 18 to 20 years old with no service records, rusted components, dirty coils, and weak airflow is going to get flagged.

In San Diego's inland communities (Ramona, Lakeside, Santee, El Cajon, Valley Center), where summer temperatures regularly climb into the mid-90s, a failing HVAC system isn't a future concern. It's a livability issue right now. Full system replacement runs $6,000 to $12,000.

One detail most buyers don't think about: ductwork. Older homes in San Diego often have uninsulated or disconnected ducts in the attic, which means the system runs nonstop without adequately conditioning the house. It's not technically a "failure," but it signals deferred maintenance and inflated utility bills, and it factors into how buyers perceive the home's overall condition.

Termite and Pest Damage

Termites are a fact of life in San Diego. The warm climate supports both drywood and subterranean species, and we find evidence of activity on a significant percentage of inspections.

Drywood termites leave small frass pellets (they look like sawdust) near window frames, baseboards, and door frames. Subterranean termites build mud tubes along foundation walls and can cause significant structural damage over years of unchecked activity. Both types are common across the county.

A standard home inspection is not a termite inspection (they're separate services in California), but we note visible evidence of wood-destroying organisms when we see it.

If we find signs of activity, we recommend a full pest inspection by a licensed operator who will issue a Section 1 (active infestation and damage) and Section 2 (conditions conducive to infestation) report. Buyers using VA loans should know that a clear termite report is often required before the lender will fund the loan, so this finding can directly affect whether the sale closes on time.

Unpermitted Work and Code Violations

This one catches a lot of San Diego buyers off guard. Converted garages, enclosed patios, added bedrooms, and illegal ADU conversions are everywhere in this county.

The housing shortage has pushed homeowners to add living space without pulling permits, and those modifications create real problems when it's time to sell.

We can't verify permits during the inspection (that's a separate County records search), but we can identify work that doesn't meet current building codes. Common signs include electrical outlets that aren't grounded in an addition, plumbing without proper venting, structural headers that are undersized or missing, and bedrooms without code-compliant egress windows.

Unpermitted work creates liability for the buyer. If something goes wrong with construction that was never inspected or approved, insurance may deny the claim. And if the city discovers it, the homeowner can be required to bring everything up to code or tear it out entirely. Legalizing an unpermitted ADU in San Diego can cost $15,000 to $50,000 depending on what's needed.

Safety findings often overlap with code violations. Missing smoke detectors, absent carbon monoxide alarms, anti-tip brackets not installed on freestanding ranges, and handrails missing from stairs with four or more risers come up regularly. These are usually cheap fixes, but they signal a pattern of deferred maintenance that buyers should pay attention to.

Earthquake Preparedness

San Diego doesn't get the seismic attention that LA does, but the county sits near several active fault lines, and homes built before the 1980s often lack modern retrofitting. Common findings include water heaters without earthquake strapping (required by California code), cripple walls in crawl spaces that aren't braced, and older masonry chimneys that aren't reinforced. These items are relatively inexpensive to address ($200 to $2,000 in most cases), but they show up on virtually every inspection of a pre-1980 home and contribute to the buyer's overall sense of how well the property has been maintained.

What Happens After the Inspection

Understanding the findings is only half the equation. The other half is knowing what to do with them.

For buyers: once the report comes back, you have three paths. You can request specific repairs, ask for a price reduction, or request a seller credit toward closing costs. You can accept the findings and move forward. Or you can exercise your inspection contingency and walk away if the problems are too severe or too expensive. Your agent will help you decide which approach makes sense based on the specific findings, the market conditions, and how badly you want the house.

The findings most likely to affect your closing are safety hazards, major system failures, and anything a lender or insurer won't accept. Active roof leaks, dangerous electrical panels, pest damage, missing railings (FHA flag), and foundation instability all fall into this category. These are the issues that can delay funding, trigger lender-required repairs, or cause an insurer to decline coverage.

For sellers: inspection findings are most effectively handled before you list. A pre-listing inspection gives you the chance to fix problems on your own timeline, with your own contractors, instead of scrambling during escrow while a buyer's repair request hangs over the deal. Repairs done reactively during escrow tend to cost more and carry more negotiation leverage for the buyer.

How to Read the Severity

Not every finding carries the same weight. Here's how we generally categorize what shows up on the report:

Category	Examples	What Usually Happens
Cosmetic / Maintenance	Peeling paint, caulk gaps, loose doorknobs	Accepted as-is
Moderate Concerns	Aging water heater, missing GFCI outlets, minor grading issues	Repair request or credit
Significant Defects	Roof near end of life, old HVAC, sewer line decay	Major negotiation
Safety / Structural	Active foundation movement, FPE panel, extensive mold, unpermitted work	Buyer walks or demands large concession
Best for	Smooth closings	Most transactions

The first two categories rarely derail a transaction. The third slows things down and changes the numbers. The fourth is where deals actually fall apart.

How We Handle Inspections at 360 Home Inspections

We've been performing inspections across San Diego County for over 25 years, and our team of InterNACHI certified inspectors comes from deep construction backgrounds.

That means we don't just point at problems. We understand why they're happening and what it takes to address them.

We inspect single-family homes, condos, townhomes, new construction, commercial buildings, and we offer specialized services including sewer scope inspections, mold testing, pool and spa inspections, and balcony inspections. Every inspection comes with a detailed, photo-documented report delivered within 24 hours. For buyers who want to keep cash available during escrow, we offer pay-at-close at no additional cost.

We serve every community in San Diego County, from Oceanside and Carlsbad in the north to Chula Vista and National City in the south, plus Fallbrook and Murrieta. Schedule your inspection here or call us at (858) 707-7066.

Frequently Asked Questions

Q: What are the most common things that fail a home inspection in San Diego?

The short answer to what fails a home inspection in San Diego: roof damage from UV exposure, foundation cracks from expansive clay soil, outdated electrical panels (Federal Pacific and Zinsco), cast iron sewer line decay in pre-1980s homes, and mold from coastal moisture. These carry the highest repair costs and the most negotiation weight.

Q: Can a house actually fail a home inspection?

Technically no. There's no pass or fail grade. The report documents defects, hazards, and aging systems. Certain findings (active foundation movement, a panel with known fire risk, extensive mold) effectively kill the deal in practice, but the decision always belongs to the buyer.

Q: How much does a home inspection cost in San Diego?

A standard inspection runs $350 to $700 depending on home size and age. Sewer scope, mold testing, and pool inspections add to the total. We offer pay-at-close so buyers don't need to pay out of pocket during escrow.

Q: What happens if major problems show up?

You have three options: negotiate repairs or a price reduction with the seller, accept the findings and move forward, or use your inspection contingency to exit the deal. Your agent will advise you based on the severity of the findings and the local market.

Q: What issues can actually stop a home sale from closing?

Anything a lender or insurer won't accept: active roof leaks, dangerous electrical systems, pest damage on a VA loan, foundation instability, and missing safety features required by FHA. These can delay or prevent funding.

Q: Is a termite inspection included?

No. In California, termite inspections are a separate service performed by a licensed pest control operator. Your home inspector will note visible signs of wood-destroying organisms, but the full Section 1 and Section 2 report requires a separate appointment.

Q: What electrical problems are most dangerous?

Federal Pacific and Zinsco panels top the list because of documented failure rates. Beyond panels, ungrounded outlets, aluminum wiring without proper connectors, double-tapped breakers, and missing GFCI protection in wet areas are the most common safety findings.

Q: How long does a home inspection take?

Most take 2 to 4 hours depending on the home's size, age, and condition. Homes with add-on services take longer. We encourage buyers to attend so they can see the home through an inspector's eyes. For full scope details, see our guide on what a home inspection covers.

Q: Should I walk away over foundation cracks?

Not necessarily. Foundation cracks range from cosmetic hairline settling (normal in older homes) to active structural movement (expensive and concerning). If your inspector flags foundation concerns, the next step is a structural engineer evaluation. That gives you a professional opinion on severity and repair cost, which is what you actually need to make a decision.

Q: What should sellers fix before listing?

Start with safety items: smoke detectors, carbon monoxide alarms, GFCI outlets, handrails. Then address the big-ticket findings that show up on every buyer's report: roof condition, panel type, plumbing leaks, and drainage grading. Fixing these before listing removes leverage from the buyer and speeds up closing.

Final Thoughts

Every home has something. That's not a crisis. It's just the reality of buying a building that has been lived in, maintained to varying degrees, and weathered over time. The purpose of a home inspection isn't to find a perfect property. It's to make sure you know what you're getting into.

If you came here asking what fails a home inspection, the honest answer is: it depends on the house. But the issues we walked through here, from roofs worn down by relentless sun to foundations stressed by clay soil to electrical panels from a generation ago, are the findings that come up most often across San Diego. Some are negotiating points. Some are legitimate reasons to reconsider. And a few are safety concerns that need attention regardless of who ends up owning the home.

If you're getting ready to buy in San Diego and want to understand what to look for, or if you're selling and want to handle issues before they become someone else's leverage, we're here. Reach out anytime.

Pricing estimates in this article reflect general market ranges as of August 2026 and will vary by property size, location, contractor, and scope of work. Always request detailed quotes from licensed professionals before making repair or budget decisions.