Beyond the Standard Inspection: Radon, Mold, Pests, and Sewer Scopes

A general home inspection covers a lot of ground — the roof, the foundation, the electrical panel, the major systems. What it typically doesn't cover, at least not in depth, are a handful of specific issues that require their own specialist and their own separate inspection. First-time buyers often don't realize these exist until someone mentions them mid-transaction, which is usually a rushed and stressful time to be learning about a whole new category of home inspection.

Why the General Inspector Can't Cover Everything

A standard home inspector is a generalist, trained to visually assess the condition of a home's major systems and flag concerns. But some issues require specialized equipment, licensed testing, or expertise that falls outside a standard inspection's scope — a general inspector might note visible mold or a hint of pest activity and simply recommend you get it professionally evaluated, rather than diagnosing it themselves. That recommendation is worth taking seriously rather than skipping to save a little money or time.

Radon Testing

Radon is a naturally occurring, odorless gas that can seep into homes from the ground, and it's a recognized health concern at elevated levels — it isn't something you can see, smell, or notice on a walkthrough. Testing is simple: a small monitor is placed in the lowest livable level of the home for a set period, typically a couple of days, and it measures radon concentration in the air.

Whether radon testing is worth the added cost depends partly on your region and even your specific neighborhood, since levels vary significantly based on local soil and geology. If radon is a known concern in your area, or if the home has a basement or is built on a slab in a radon-prone region, it's a relatively inexpensive test relative to the peace of mind — and if levels come back elevated, mitigation systems exist and are a fairly established, solvable fix, not a reason to panic.

Mold Inspections

A general inspector will flag visible mold if they see it, along with obvious moisture problems that could lead to mold — water stains, musty odors, past flooding. But mold can also grow in places a standard inspection doesn't reach, like inside wall cavities or under flooring, especially in a home with a history of water intrusion.

A dedicated mold inspection typically involves air quality testing and sometimes surface sampling, done by a specialist with the right equipment. This one is worth prioritizing if the general inspection turned up any moisture red flags, if the home has a basement or crawlspace with a musty smell, or if you or a family member has respiratory sensitivities that make air quality a bigger priority for your household specifically.

Termite and Pest Inspections

A wood-destroying pest inspection — often required outright by certain loan types in some regions, so ask your lender — looks specifically for termites, wood-boring beetles, carpenter ants, and the damage they leave behind. This is a different, more specialized look than what a general inspector provides, focused specifically on structural wood and signs of infestation that aren't always visible without targeted probing.

Given that termite damage in particular can be structurally significant and expensive to repair, and that infestations aren't always obvious to an untrained eye, this is one of the specialty inspections worth treating as close to standard rather than optional, especially in regions where termites are common.

Sewer Scope Inspections

This is the one first-time buyers are most likely to skip, and it's arguably one of the more valuable specialty inspections available, especially for an older home. A sewer scope involves running a small camera through the home's main sewer line to check for cracks, root intrusion, collapses, or blockages — issues that are completely invisible from inside the house and that a general inspector has no way to assess.

Sewer line repairs, if something is wrong, can be a genuinely significant expense, and problems tend to develop gradually and silently until a backup or flood makes them suddenly, unpleasantly obvious. For a home with mature trees near the sewer line, or any home more than a few decades old, a sewer scope is a relatively small cost that can prevent an expensive and disruptive surprise.

Deciding Which Ones Are Worth It for You

You don't necessarily need every specialty inspection on every home — that can add up in both cost and time during an already busy transaction. A reasonable approach is to let the specifics of the home and the general inspection guide you:

1. Take your general inspector's recommendations seriously — if they flag something and suggest a specialist, don't skip that step to save money.
2. Weigh the home's age and history — an older home, or one with a known history of water issues, leans toward more specialty inspections being worthwhile.
3. Consider your region's known risks — radon and termites in particular vary widely by geography, so a local agent or inspector can tell you what's actually common in your area.
4. Remember these are all negotiable line items — if something significant turns up, you have the same options as with the general inspection: ask for repairs, a credit, or in some cases walk away.

None of these specialty inspections are free, and it can feel like an accumulating pile of costs on top of everything else you're already spending during a home purchase. But weighed against what you're buying — a home you may live in for a decade or more — a few hundred dollars spent finding out what's really going on behind the walls and beneath the yard is a small price for confidence in the biggest purchase you've likely ever made.