Home Inspection Checklist for San Diego Buyers

This home inspection checklist gives San Diego buyers a system-by-system list of what to check before you commit to a property: roof, electrical, plumbing, HVAC, foundation, moisture, and drainage. Use it to walk a home with sharper eyes, ask better questions, and know which local red flags deserve a closer look from a licensed inspector.

How to use this checklist

A professional inspection is non-invasive and visual, and so is your own walk-through. You are not pulling panels or crawling under the house. You are training your eye to notice the things that turn into negotiations, repair bills, or deal-breakers. Bring this list to a showing or your inspection day, and flag anything that looks off so your inspector can weigh in.

One thing to remember up front: almost every home produces a list of findings. The point is not to find a flawless house. It is to understand the property’s real condition and to separate cosmetic wear from the consequential stuff. For the full process and how this fits your contingency timeline, see our first-time home buyer inspection guide for San Diego.

The roof

San Diego roofs take a beating from intense sun and, near the coast, from salt air, even though we get relatively little rain. That combination dries out and cracks roofing materials faster than buyers expect, then the rare heavy storm exposes the weak spots.

• Roof covering — Look for cracked or curling shingles, broken or slipped clay and concrete tiles, and bald spots where granules have washed off. Flat and low-slope roofs are common here; check for ponding, blistering, and patched-over repairs.
• Flashing and penetrations — Inspect around chimneys, skylights, and vent pipes. Failed flashing is one of the most common leak sources.
• Gutters and drainage — Even in a dry climate, water needs somewhere to go during winter storms. Note clogged, detached, or missing gutters and downspouts that dump against the foundation.
• Interior signs — Brown ceiling stains, bubbling paint, or a musty attic point to past or active leaks regardless of what the roof looks like from the curb.

If the roof is aging, has obvious patchwork, or sits in a high-sun or coastal zone, a dedicated roof inspection is worth the small added cost. It is far cheaper than discovering a failing roof after closing.

Electrical

Electrical defects are both common and genuinely dangerous, and San Diego’s older housing stock hides plenty of them. This is one area where a builder’s eye and a tested approach matter most.

• The panel — Note the brand and look for known problem panels. Federal Pacific and Zinsco panels, found in homes from roughly the 1950s through the 1980s, are widely considered fire hazards and often flagged for replacement.
• Wiring type — Mid-century homes may have aluminum branch wiring or remnants of cloth-insulated or knob-and-tube wiring, all of which warrant scrutiny.
• GFCI and AFCI protection — Kitchens, bathrooms, garages, and exterior outlets should have ground-fault protection. Test outlets where you can.
• Visible hazards — Open junction boxes, double-tapped breakers, extension cords used as permanent wiring, and DIY additions are red flags that suggest unpermitted work elsewhere.

Plumbing

Plumbing problems range from a slow drain you can fix in an afternoon to a sewer lateral replacement that runs into many thousands of dollars. Both matter, but they are not in the same league.

• Supply pipe material — Galvanized steel pipe, common in pre-1970 San Diego homes, corrodes from the inside and chokes off water pressure over time. Copper and PEX are more reliable.
• Water heater — Check the age, signs of rust or leaking at the base, and whether it is properly strapped for earthquakes, which California requires.
• Functional flow and leaks — Run faucets, flush toilets, and look under sinks for active drips, water staining, and prior patch jobs.
• The sewer lateral — This is the big one in San Diego. A standard inspection cannot see inside the buried line.

Many older neighborhoods still rely on clay or cast-iron sewer laterals that are decades past their prime. These pipes crack, corrode, and get invaded by tree roots, and a replacement is one of the most expensive surprises a homeowner can face. For any older home, we strongly recommend a sewer scope that runs a camera down the line. It is cheap insurance against a very costly problem.

HVAC: heating and cooling

Climate varies sharply across the county. Coastal homes in La Jolla or Encinitas may have minimal or no air conditioning, while inland properties in El Cajon, Santee, or Escondido depend on it through brutal summer heat.

• System age and type — Furnaces and AC units have a finite lifespan. An aging system nearing the end of its life is a real budget item.
• Operation — Confirm both heating and cooling actually run and produce the right temperature at the registers.
• Ductwork and filters — Look for crushed ducts, disconnected runs, and filthy filters that signal deferred maintenance.
• Coastal corrosion — Near the ocean, salt air eats away at condenser coils and metal components, shortening equipment life on otherwise newer systems.

Foundation and structure

Much of inland San Diego sits on expansive clay soil that swells when wet and shrinks when dry. Areas like Scripps Ranch, Mira Mesa, Rancho Bernardo, and parts of El Cajon are well known for it. That seasonal movement stresses foundations and slabs over the years, producing cracks you will eventually see inside and out.

• Foundation cracks — Hairline cracks are often cosmetic settling. Wide, stair-stepped, or horizontal cracks, or cracks that have been repeatedly patched, deserve a closer evaluation.
• Interior clues — Sticking doors and windows, sloping or bouncy floors, and diagonal cracks at door corners can all hint at movement.
• Hillside homes — San Diego’s many hillside properties add retaining walls and slope stability to the picture. Look for leaning or cracked retaining walls and signs of soil movement.
• Slab vs. raised foundation — Raised foundations have a crawlspace to assess for moisture, framing, and pests; slab homes are evaluated differently.

Not every crack is a crisis. The value of an inspection is telling cosmetic settling apart from a structural concern, and knowing when a specialist’s opinion is warranted.

Moisture and the marine layer

San Diego’s coastal marine layer keeps humidity high along the coast for much of the year, and that persistent moisture is a quieter threat than a dramatic leak. It feeds mold, mildew, and wood rot in homes that do not breathe well, especially in bathrooms, closets on exterior walls, and poorly ventilated attics and crawlspaces.

• Mustiness — Trust your nose. A musty smell often means moisture is collecting somewhere out of sight.
• Visible mold and staining — Check grout lines, window sills, the back of closets, and around windows for discoloration and surface mold.
• Bathroom ventilation — Confirm exhaust fans actually vent outside, not just into the attic, where they dump moisture into the structure.
• Hidden moisture — This is exactly what infrared can find. A thermal imaging scan reveals temperature differences behind walls and ceilings that flag hidden moisture intrusion and missing insulation the eye cannot see, which is especially useful in coastal homes prone to marine-layer dampness.

Drainage and grading

Because most of our rain falls in a few concentrated winter storms, drainage problems stay hidden most of the year and then reveal themselves all at once. Poor drainage is also one of the leading contributors to foundation and moisture trouble, so it ties the whole checklist together.

• Grading — The ground should slope away from the home on all sides. Soil that pitches back toward the foundation channels water exactly where you do not want it.
• Downspout discharge — Water should be carried well away from the structure, not dumped at the base of a wall.
• Hardscape and pooling — Look for patios, driveways, and walkways that slope toward the house and for low spots where water visibly pools.
• Retaining walls and slopes — On hillside lots, check that drainage behind retaining walls is working and that there are no signs of erosion or undermining.

Coastal corrosion: a county-wide caveat

If you are buying within a mile or two of the ocean, in Encinitas, Carlsbad, Oceanside, Del Mar, Pacific Beach, or La Jolla, factor in salt-air corrosion across the board. It accelerates wear on electrical panels, fasteners, HVAC coils, metal railings, garage doors, and roof flashing. A coastal home often shows more wear than an inland home of the same age, and elevated wood decks and balconies near the water deserve an especially close look. If you are buying into a condo or HOA building, balcony elements may also fall under California’s balcony inspection laws.

What this checklist cannot replace

Walking a home with this list makes you a far more informed buyer, but it is not a substitute for a licensed inspection. A professional inspector reaches and tests systems you should not, documents findings with photos in a written report you can use to negotiate, and brings the judgment to know which San Diego quirks actually matter on this specific property. Our lead inspector, Joseph Romeo, is an InterNACHI Certified Professional Inspector and a CSLB-licensed General Contractor, which means defects get evaluated by someone who understands how homes are really built and repaired.

A complete buyer’s inspection covers all of the systems above and more, and we will recommend the right add-ons, like a sewer scope or thermal imaging, based on the home’s age, location, and features.

Ready to inspect your San Diego home?

When your offer is accepted, move quickly so you have time to act on the findings within your contingency window. Call (619) 752-4399, email joe@sandiegohomeinspection.com, or reach out online, and we will help you book an inspection across San Diego County with confidence.