A general home inspection is a broad, visual, non-invasive look at the home’s major systems and components. Specialized inspections go deeper into one area a generalist can’t fully evaluate, such as a sewer scope, pool, thermal scan, termite (WDO), mold, chimney, or a structural engineer’s review. You add them when the home, the age, or a red flag warrants it.
What a general home inspection actually covers
When Joseph Romeo, our InterNACHI Certified Professional Inspector (CPI), performs a standard inspection, he’s walking the property and evaluating the readily accessible, visible condition of the major systems: roof covering, structure and foundation, exterior and grading, attic and insulation, plumbing fixtures and visible supply and drain lines, the electrical panel and outlets, heating and cooling, water heater, interior finishes, doors, windows, and built-in appliances. It’s a wide net cast across the whole house in a few hours.
The key word is visual. A general inspection is non-invasive. We don’t open walls, dig up the yard, dismantle equipment, or run lab tests. We report what we can see and safely access, and we flag conditions that suggest a problem worth a closer look. That’s exactly where specialized inspections come in: they pick up where the visual scope ends.
Understanding those boundaries matters more than most buyers expect. If you want the full picture of what falls outside the standard report, our breakdown of what a buyer’s inspection includes is a good companion read, and it explains why a single inspection rarely answers every question on an older or unusual property.
The most common add-ons (and when each is worth it)
You don’t need every specialist on every house. The right add-ons depend on the home’s age, location, and what the general inspection turns up. Here’s how we think about the most common ones in San Diego County.
Sewer scope
A general inspection checks that drains flow and looks for visible leaks, but the lateral line running from the house to the city main is buried and out of sight. A sewer scope sends a camera down that line to find root intrusion, bellies (low spots that collect waste), cracks, offsets, and old clay or Orangeburg pipe. This is one of the highest-value add-ons in our area. Many San Diego neighborhoods, from Kensington to North Park to older parts of La Mesa, have homes built before the 1960s with original clay laterals. A repair can run from a few thousand dollars for a spot fix to well over $15,000 for a full trenchless or open-trench replacement; treat that as a rough range that varies widely by length, depth, access, and contractor, and get multiple licensed bids. For any home over roughly 35-40 years old, a scope is almost always worth it.
Thermal imaging
An infrared camera reads surface-temperature differences, which can reveal moisture behind walls, missing insulation, overheating electrical connections, and some hidden plumbing leaks that aren’t visible to the eye. Thermal imaging doesn’t see through walls, and it isn’t a moisture meter on its own, but as a screening tool it points us toward areas that deserve hands-on follow-up. It’s especially useful on coastal and older homes where past water intrusion is common.
Termite / wood-destroying organism (WDO)
This one is a hard line. A general home inspector does not perform a termite or WDO inspection; that requires a licensed pest-control operator. We’ll note visible evidence we happen to see, like obvious mud tubes or damaged wood, but a real WDO report must come from a licensed structural pest company. In Southern California, subterranean and drywood termites are widespread, and many lenders and sellers expect a separate WDO report. Our overview of termite and WDO inspections in San Diego explains how that report fits alongside the general inspection.
Mold and moisture assessment
A general inspection identifies visible moisture, staining, and conditions that promote mold, but confirming mold type or air quality requires sampling and a lab. If we see suspicious growth or you have health concerns, the next step is a qualified indoor-air or environmental specialist. Coastal humidity and older bathrooms make this a more frequent referral here than in drier inland markets. We cover the local angle in our piece on mold and moisture in coastal San Diego homes.
Pool and spa
Pools, spas, and their equipment are typically excluded or only superficially reviewed in a standard inspection. A dedicated pool inspection evaluates the pump, heater, filter, plumbing, bonding, safety barriers, and the shell. If you’re buying a home with an in-ground pool, this is worth booking separately given how expensive pool repairs can be.
Chimney
We can see the exterior of a chimney and the visible firebox, but the flue interior often needs a Level II camera inspection by a certified chimney sweep, especially on wood-burning fireplaces in older homes or after an earthquake. Cracked flue tiles and creosote buildup are real fire and carbon-monoxide hazards that a visual-only check can miss.
Structural / geotechnical engineer
When a general inspection finds significant foundation movement, large or progressive cracks, slope or drainage concerns, or evidence of prior repair, the right next call is a licensed structural or geotechnical engineer. We identify and document the symptoms; an engineer diagnoses the cause and specifies the fix. San Diego’s expansive clay soils and hillside lots make this referral common. If you’re trying to gauge whether a crack is cosmetic or serious, start with our guide to foundation cracks and when to worry before deciding whether an engineer is warranted.
How to decide what to add
A simple way to think about it: the general inspection is your map, and specialists are the deeper dives where the map shows something worth investigating. A few practical triggers we see all the time:
- Age of the home. Pre-1970 properties almost always justify a sewer scope, and often a closer electrical and plumbing look. Our notes on electrical panel problems in older San Diego homes explain why.
- Location. Coastal homes raise the odds you’ll want moisture and mold attention; hillside lots raise the odds you’ll want an engineer.
- Findings. If the general report flags something it can’t fully evaluate, that flag is your cue to bring in the matching specialist.
- Features. Pools, wood-burning fireplaces, and additions of unknown permit history each invite a dedicated look.
You don’t have to decide everything in advance. A good general inspection tells you which specialists, if any, are actually worth the added cost for that specific house, so you’re spending money where the risk is, not everywhere.
Start with the right foundation
The smartest sequence is almost always the same: book a thorough general inspection first, then layer in specialists based on what it reveals. We can coordinate several of these add-ons in one visit. If you’re planning a purchase and want help deciding what your particular home needs, reach out to our team or call (619) 752-4399, and we’ll walk you through a plan that fits the property, not a one-size-fits-all upsell.
