What Treasure Valley Home Inspections Typically Reveal (Resale and New Construction)

The home inspection is the moment when what a property actually is gets separated from what it looked like in the photos. I've been through enough inspections — on my own purchases and on behalf of clients — to tell you that the findings are almost never zero, and that buyers who walk in expecting a clean report are regularly surprised by what a qualified inspector surfaces. This is true for resale homes. It's also true — and less commonly understood — for brand-new construction in a market where the pace of building has consistently outrun the pace of careful workmanship.

This post covers what Treasure Valley inspections actually reveal, broken down by home type and age, the issues that are specific to this market and its climate, the one environmental risk that most buyers here still underestimate, and the mistakes buyers make around inspections that cost them money even when they technically got one. If you're purchasing in this valley — resale or new construction — understanding what's coming in the inspection report before you're sitting in front of one helps you make faster, better decisions when it arrives.

For context on how inspections fit into the broader new construction process, the builder contract post covers the pre-drywall and pre-closing inspection framework in detail. This post goes deeper on what those inspections actually find.

First: Idaho Has No Inspector Licensing Requirements

This is something almost nobody tells buyers before they hire an inspector, and it matters more than it should. Idaho has no state licensing or certification requirement for home inspectors. Anyone can legally call themselves a home inspector in Idaho and offer services, regardless of training, experience, or qualifications. The quality of inspectors varies dramatically as a result, and a cheap inspection from an unqualified inspector is one of the more dangerous false economies in the home-buying process — because you're not just paying for a report, you're paying for protection against the things you didn't know to look for.

The right way to hire an inspector in this market: look for third-party certifications from ASHI (American Society of Home Inspectors) or InterNACHI (International Association of Certified Home Inspectors), which have their own training, examination, and continuing education requirements. Ask specifically about their experience with the type of home you're buying — new construction inspectors need different expertise than those specializing in older resale homes. Ask if they use thermal imaging cameras, which can identify missing insulation and moisture intrusion behind finished walls that a standard visual inspection won't catch. And do not use an inspector recommended by the seller, and be thoughtful about one recommended by the builder's own process on a new construction buy — you want a third-party who answers to you, not to the other party in the transaction.

What Resale Home Inspections Typically Find

Resale inspections in the Treasure Valley — covering homes that are anywhere from five to fifty or more years old — reliably surface certain categories of issues depending on the home's age. Here's what shows up most consistently:

Roof condition. Asphalt shingle roofs in Idaho's climate typically last 20 to 30 years, and a significant portion of the valley's resale inventory is approaching or past that threshold. Inspectors will identify shingle age, condition, granule loss, flashing integrity, and any active or past leakage. A roof that needs replacement in the near term is typically a $10,000 to $18,000 line item depending on size, pitch, and material chosen. This comes up regularly enough that buyers should ask specifically about roof age before they order a home inspection — knowing you're looking at a 22-year-old roof changes how you approach the offer.

HVAC systems. Furnaces and air conditioning units have defined service lives — typically 15 to 20 years for furnaces, 12 to 17 for AC compressors — and older systems near the end of their life will be noted in the inspection report. In Boise's climate, where summer temperatures regularly push into the mid-90s to 100°F range and heating is required from November through March, HVAC reliability is not an academic concern. A failing AC unit in an Idaho summer is a genuine emergency. Replacement costs run $4,000 to $12,000 depending on the system size and type. Older homes frequently have systems that are technically functional but within two to three years of likely failure.

Electrical panels and wiring. Older homes in Boise and the surrounding valley may have Federal Pacific or Zinsco panels, which have documented failure and fire hazard histories and are typically flagged by any qualified inspector. Double-tapped breakers, improper grounding, aluminum branch circuit wiring in the wrong locations, and missing GFCI protection in bathrooms and kitchens are other common electrical findings. Panel replacement typically runs $2,500 to $6,000 depending on the size and scope of work needed.

Water intrusion and moisture. Idaho's climate is generally dry, which means water intrusion issues tend to be concentrated around specific failure points rather than generalized dampness — improper flashing at roof-wall junctions, leaking windows or doors, and grading issues that direct surface water toward the foundation rather than away from it. Inspectors with thermal cameras can identify moisture behind finished surfaces that would otherwise be invisible.

Deferred maintenance accumulation. The category that most commonly surprises buyers: the aggregate of smaller items — deteriorated caulking, missing handrails, inoperable windows, water heater age, minor plumbing leaks, damaged attic insulation — that individually seem manageable but together represent a meaningful first-year maintenance budget. A typical resale inspection on a fifteen-year-old home might produce 30 to 50 line items, most of which are not deal-breakers but all of which represent cost or effort in your first year of ownership.

What New Construction Inspections Actually Find

The most persistent misconception in this market is that new construction homes don't need inspections because everything is new. Local inspection companies in the Treasure Valley are emphatic on this point from direct experience: new construction homes consistently produce significant findings, and the pace at which the valley has been building is a contributing factor. When trades are stretched thin — and in a market where the Micron and data center build-out is pulling skilled workers away from residential projects, trades are stretched — quality control lapses are more common than they would be in a more leisurely construction environment.

What Treasure Valley new construction inspections find most consistently, per local inspection data:

Missing insulation. This comes up with remarkable frequency — rooms where insulation was forgotten before drywall was hung, attic sections that were left uninsulated, exterior wall cavities that show up as thermal voids on infrared imaging. Missing insulation in a home that has to handle Idaho summers and winters is both an energy cost issue and a comfort issue, and it's invisible to any buyer who doesn't hire an inspector with a thermal camera.

Improper window and door sealing. Poorly sealed windows and doors allow both drafts and potential water intrusion, and they're a common finding in fast-paced new construction environments where finishing crews are under timeline pressure.

Roof flashing installation errors. Incorrectly installed flashing at roof-wall intersections, around penetrations, and at valleys is one of the most consequential inspection findings on new construction — because it's not visible from the ground, it's hidden behind finished surfaces, and it can cause significant water damage before anyone realizes there's a problem. Local inspectors flag this regularly.

Plumbing joints and unconnected vents. Leaks at plumbing joints under sinks or behind walls, and vents that were not properly connected before drywalling, appear in new construction inspections with enough frequency that every inspection company serving this market specifically mentions them. A disconnected plumbing vent found during a sewer scope on a brand-new home is not hypothetical — it's a documented occurrence that has happened in Treasure Valley new construction.

Electrical wiring errors. Improperly wired outlets, ungrounded circuits, and wiring configurations that don't meet code despite passing the city inspection are found regularly in new construction. These represent both safety and liability risks that the builder is obligated to correct before closing if they're discovered through a buyer-side inspection — which is the only way they're discovered at all before the walls are sealed.

Grading and drainage problems. Improper grading around the home's foundation — soil that slopes toward the house rather than away from it — is one of the most common and most consequential new construction findings. Water that pools against a foundation rather than draining away creates long-term moisture risk and, in the valley's expansive soil conditions, can accelerate foundation movement. This is a relatively straightforward fix when caught before a buyer takes possession; it's a more complicated conversation two years later.

Radon: The Risk Most Buyers Underestimate

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It seeps into homes through foundation cracks, construction joints, and any gap between the home and the ground, where it accumulates — and it's colorless, odorless, and completely invisible without testing. It's the second leading cause of lung cancer in the United States after smoking, and Idaho has above-average radon levels relative to the national baseline.

The Treasure Valley sits on a geology that produces meaningful radon concentrations. Local inspection companies and the Idaho DEQ both specifically flag this area as higher-risk than most buyers coming from California or the Pacific Northwest are accustomed to. The EPA action level — the threshold above which mitigation is recommended — is 4 picocuries per liter. Testing regularly finds levels above that threshold in Treasure Valley homes, including new construction. The fix, when levels are elevated, is a radon mitigation system: a sub-slab depressurization system that vents radon below the foundation to the exterior. Cost runs approximately $800 to $1,500 installed. The test costs $150 to $300 through your inspector. Don't skip it.

Sewer Scope: The Inspection Almost Nobody Does

A sewer scope inspection runs a camera through the main sewer line from the home to the city connection to inspect for blockages, root intrusion, pipe condition, grade issues, and any separations or collapses. It's a separate service from the standard home inspection, typically costs $150 to $300, and provides visibility into a failure point that can cost $5,000 to $20,000 or more to repair if it's not caught before closing.

In a market with as many new construction homes as the Treasure Valley has, you might think sewer scope is less relevant — but local inspection companies actively recommend sewer scopes on new construction specifically because disconnected or improperly graded sewer laterals are found on brand-new builds with enough frequency to warrant it. Tree root intrusion is more relevant on older homes, but incorrect installation — a pipe that didn't get properly connected or has insufficient fall to drain correctly — is a new construction risk that a scope will catch. If the seller or builder refuses to allow a sewer scope, that's a notable data point about their confidence in what the camera would find.

Expansive Soils and Foundation Movement

The Treasure Valley sits in a seismically active region of Idaho, and soil conditions across Boise, Meridian, Nampa, and surrounding areas vary considerably. Some areas have expansive soils — clay-heavy compositions that shrink in dry conditions and expand when wet, creating movement forces that act on foundations and slabs over time. Foundation irregularities in expansive soil conditions don't stay small if they're not addressed; the movement that produces an initial hairline crack can produce a structural problem over years of moisture cycling.

For resale buyers, foundation condition is one of the most important inspection elements — both for what the inspector can see (cracking patterns, settlement, displacement) and what requires further evaluation from a structural engineer if concerning patterns are found. For new construction buyers, the pre-drywall inspection is the best opportunity to evaluate foundation and framing quality before it's hidden behind finished surfaces — because once the walls are closed, early foundation issues become invisible until they've progressed far enough to manifest through the finished interior. This is the structural argument for the pre-drywall inspection that goes beyond the workmanship arguments — soil conditions here make foundation visibility at that stage meaningfully more valuable.

HVAC Sizing in Extreme Heat

This is a Treasure Valley-specific inspection concern that rarely appears in national homebuying guides. When July and August temperatures routinely reach 97 to 103°F — and occasionally higher during heat events — an undersized or marginally sized air conditioning system that functions adequately in moderate weather reveals itself quickly. The issue isn't always visible in the spring when most buyers are touring homes; it becomes visible in August when the system runs continuously and still can't hold the house below 80°F.

A qualified inspector should verify that the HVAC system is appropriately sized for the home's square footage and layout — specifically including the load calculation that accounts for the valley's extreme summer temperatures. Systems that were installed to minimum code requirements in a milder climate specification can be technically compliant but functionally inadequate for Idaho summers. This matters especially on homes that have been renovated or added onto without a corresponding HVAC assessment, and on new construction where the builder used a minimum-size unit to keep costs down. Ask your inspector specifically about HVAC sizing in addition to age and condition.

Sprinkler and Irrigation System Issues

The valley's widespread use of pressurized irrigation systems — the canal water infrastructure that provides non-potable water for lawn irrigation at minimal annual cost — creates its own inspection category that doesn't exist in most other markets. Sprinkler and irrigation system inspections are often not included in a standard home inspection scope and need to be specifically requested or scheduled separately. Common findings include: heads that need adjustment or replacement, zones that don't activate properly, control systems with programming issues, and backflow prevention devices that haven't been tested recently.

More consequential: on homes with domestic water irrigation systems rather than pressurized canal water — a distinction covered in depth in the what maps don't show post — the condition of the domestic irrigation connection and the system's draw on the water meter should be documented. Know what type of system you're buying and what its current functional state is before closing, because irrigation problems discovered in May when you turn the system on for the first time are a worse experience than irrigation problems documented in the inspection and negotiated before closing.

The Pre-Drywall Inspection: Why It Matters

For new construction buyers, there are two critical inspection windows — and the one most buyers don't take is arguably the more valuable of the two. The pre-drywall inspection happens after framing, electrical rough-in, plumbing rough-in, and HVAC rough-in are complete but before drywall is hung. It's the only point in the construction process where an inspector has full visual access to the structural framing, the wiring, the plumbing, and the mechanical rough-in before any of it is hidden permanently behind finished surfaces.

What can be caught at this stage and corrected before walls close: framing issues including improper bearing wall connections, wrong header sizing over openings, and missing blocking; electrical rough-in problems including circuit sizing, grounding, and box placement; plumbing rough-in including joint integrity, vent configuration, and pipe slope; and any grading or foundation concerns before the slab is covered. Local inspection data confirms that pre-drywall inspections regularly surface issues that pass city inspections but don't meet quality standards — missing insulation, improper framing connections, electrical configurations that will require correction. The cost of fixing these issues before drywall is a fraction of what they cost to fix after the walls are finished.

Inspection Mistakes That Cost Buyers Money

Having an inspection and benefiting from an inspection are not the same thing. Here are the most consistent ways buyers undermine the value of the inspection process in this market.

Hiring on price alone. An inspection is not a commodity. A $199 inspection from an uncertified inspector with no thermal camera and limited Idaho-specific experience is not the same product as a $450 inspection from an ASHI-certified inspector with a thermal camera and deep familiarity with Treasure Valley soil conditions, construction practices, and common local failure modes. The difference between those two inspections can be the difference between catching a $12,000 problem before closing and discovering it six months later.

Skipping the radon test. It's an add-on. It's worth adding. The valley's geology produces elevated radon in enough homes — including new construction — that not testing is a meaningful risk that's cheap to eliminate. If levels are elevated, the mitigation is relatively affordable. Discovering elevated radon after closing is nobody's legal obligation to fix but yours.

Not getting a sewer scope. It's a separate service. It costs $150 to $300. The downside of not getting one is a potential $5,000 to $20,000 repair that the seller would almost certainly have addressed if it had been part of the inspection negotiation.

Treating every finding equally. A 50-item inspection report is not 50 equally serious problems. A missing GFCI outlet cover plate and a deteriorated main electrical panel are both "inspection findings." Processing the full report accurately requires understanding which items are safety concerns, which are deferred maintenance, which are cosmetic, and which are deal-altering — a distinction a good inspector and a good agent will help you make. Buyers who get overwhelmed by the volume of a large inspection report sometimes walk away from fundamentally sound homes over fixable items, or miss the actually serious items in the noise.

Skipping the pre-drywall inspection on new construction. This is the most consequential inspection mistake specific to this market. Buyers who only get the pre-closing inspection on a new construction home are getting visibility into what's finished but not what's behind it. The pre-drywall inspection is the only opportunity to see the structural, mechanical, and electrical systems before they're permanently enclosed — and the issues it regularly surfaces are exactly the kind that produce expensive surprises two or three years after move-in if they're not caught.

Frequently Asked Questions

What do home inspections typically find in the Treasure Valley?

On resale homes, the most consistent inspection findings are roof condition and age (shingles approaching end of life), HVAC systems near or past their service life, electrical panel issues in older homes (Federal Pacific or Zinsco panels, double-tapped breakers, improper grounding), moisture intrusion at specific failure points, and accumulated deferred maintenance. On new construction, the most common findings are missing insulation (including behind drywall, detectable only with thermal cameras), improper window and door sealing, roof flashing installation errors, plumbing joint leaks and unconnected vents, electrical wiring errors, and grading problems that direct water toward the foundation. Radon above EPA action levels is a finding in both home types across this market.

Do new construction homes in the Treasure Valley need inspections?

Yes — unequivocally. Local inspection companies working in this market report consistent findings on new construction including missing insulation, improperly sealed windows and doors, roofing flashing errors, plumbing joint leaks, unconnected vents, and electrical wiring issues that passed city inspection but don't meet quality standards. The pace at which the Treasure Valley has been building — and the labor competition from semiconductor and data center construction pulling skilled trades into industrial projects — has created conditions where new construction workmanship issues are more common than buyers typically expect. City code inspections confirm minimum code compliance; they are not the same as a buyer-side third-party inspection.

Is radon a problem in Boise and the Treasure Valley?

Yes — more than most buyers coming from California or the Pacific Northwest realize. The Treasure Valley's geology produces above-average radon concentrations relative to the national baseline. Radon testing regularly finds levels above the EPA action level of 4 picocuries per liter in Treasure Valley homes, including new construction. Testing costs $150 to $300 as an add-on to a standard inspection. If levels are elevated, a sub-slab depressurization mitigation system runs approximately $800 to $1,500 installed. Test every home before you close.

Do I need to license to be a home inspector in Idaho?

No — Idaho has no state licensing or certification requirement for home inspectors. Anyone can legally call themselves a home inspector in Idaho regardless of training or experience. This makes third-party certification from ASHI or InterNACHI particularly important as a quality signal when selecting an inspector, since those organizations have their own training, examination, and continuing education requirements that the state does not impose. Ask specifically about certifications, experience with your home type, and whether the inspector uses thermal imaging equipment before you hire.

What is a pre-drywall inspection and why does it matter?

A pre-drywall inspection is conducted during new construction after framing, electrical rough-in, plumbing rough-in, and HVAC rough-in are complete but before drywall is hung — providing a qualified inspector with visual access to all structural, mechanical, and electrical systems before they're permanently enclosed. This is the only point in the construction process where these systems are fully visible, and it's when problems are easiest and least expensive to correct. Local inspection data confirms pre-drywall inspections regularly find missing insulation, framing issues, electrical wiring errors, and plumbing problems that both city inspectors and builder quality control missed. It is arguably the most valuable inspection stage in a new construction purchase.

Should I get a sewer scope when buying a home in the Treasure Valley?

Yes — on both resale and new construction. A sewer scope runs a camera through the main sewer line to inspect for blockages, root intrusion, pipe condition, grade problems, and separations. On resale homes, tree root intrusion and aging pipe material are the primary risks. On new construction, incorrect installation — improper pitch or disconnected connections — is found with enough frequency that local inspection companies specifically recommend sewer scopes on new builds. The inspection costs $150 to $300; the downside of skipping it is a potential $5,000 to $20,000 repair that would likely have been addressed in the inspection negotiation had it been discovered before closing.

How much does a home inspection cost in the Treasure Valley?

A standard home inspection from a qualified, certified inspector in the Treasure Valley typically runs $350 to $550 depending on the home's size, age, and type. Add radon testing for $150 to $300, a sewer scope for $150 to $300, and a pre-drywall inspection for new construction at a similar range. Budget $600 to $1,000 or more for a comprehensive inspection package on a resale home with all recommended add-ons. On a $500,000 to $700,000 purchase, spending $800 to $1,000 on a thorough inspection package is one of the highest-ROI decisions in the entire transaction — problems caught before closing are negotiated at the seller's expense; problems discovered after closing are yours.

Curtis Chism

Licensed Idaho Real Estate Agent • eXp Realty • License #SP56593

I have a Master's in Construction Management from USC and have been through enough inspections on both sides to know what to look for and what to do with what the inspector finds. Learn more at weknowtreasurevalley.com/about.