What Are Home Inspections?
Your real estate agent mentioned you might want a "specialty inspection" on top of the general one. Now you're wondering—how many types of inspections exist? Which ones do I actually need? And most importantly, am I spending money on something actually useful or is this just more fees?
The answer is simpler than you think. Every home gets a general inspection (it's standard and essential). Whether you need additional specialty inspections depends on your home's age, location, and what the general inspector finds.
Inspection Strategy
Most real estate transactions begin with a general home inspection to identify the overall condition. Based on findings or regional concerns, specialty inspections are then ordered to provide detailed assessment of specific issues. This tiered approach ensures thorough evaluation while controlling costs.
This guide walks you through every type of inspection available, so you understand what each one looks for and can decide which ones are worth your time and money—not which ones sound scary.
Real Talk
A general inspection is non-negotiable. Specialty inspections are only necessary if the general inspector flags concerns or if regional issues are common (termites in the South, radon in the Midwest, etc.). Don't let anyone fear-sell you into every inspection under the sun.
The Standard Inspection (What Everyone Gets)
This is the inspection you're getting no matter what. It's the one that takes 2–4 hours and covers everything—from the roof to the foundation to every system in between. This is your baseline understanding of whether the home is safe and what needs attention.
From the HouseProbe Community
"Our realtor said we should get a 'general inspection' and then maybe a separate mold and radon test. That's three different inspectors? Is this normal or is she just trying to slow down our closing?"
It's normal to use different specialists. One inspector does the general inspection, then you can add radon testing and mold screening if needed. Your realtor is protecting your interests, not delaying anything.
What Gets Checked
Exterior & Roof
Siding, windows, doors, decks, gutters, roof condition, flashings
Foundation & Structure
Foundation type, cracks, settling, basement condition
Electrical
Panel, breakers, outlets, switches, wiring safety
Plumbing
Supply, drainage, water heater, fixtures, water pressure
HVAC
Furnace, AC, thermostat, ductwork, air filters
Interior
Walls, ceilings, floors, water damage, mold evidence
Attic
Insulation, ventilation, framing, roof leaks
Crawl Space
Moisture, insulation, pests, structural damage
General Inspection Scope
General inspections are visual assessments. Inspectors look at systems but don't tear things apart, stress-test equipment, or provide detailed capacity analysis. They report what they can see and basic functionality. Detailed analysis of specific systems requires specialty inspections.
Cost: $300–$600 depending on home size and location | Time: 2–4 hours | When: Required for all residential purchases
Crawl Space Inspections: What's Lurking Underneath?
A dedicated crawl space inspection provides detailed assessment of moisture control, structural integrity, pest activity, and mechanical systems located in the crawl space. Crawl spaces present unique challenges due to moisture exposure, pest vulnerability, and structural support requirements. This specialized inspection goes deeper than general inspection evaluation to identify moisture problems, structural issues, and ventilation inadequacy.
What's Included in Crawl Space Inspections
- Moisture and dampness assessment
- Vapor barrier condition and adequacy
- Standing water or drainage problems
- Beam and joist condition, rot, and sagging
- Support post condition and settlement
- Pest activity signs (termites, carpenter ants, rodents)
- Ventilation system operation
- HVAC duct condition and placement
- Plumbing leaks and integrity
- Electrical hazards or improper wiring
Crawl Space Concerns
Many homes fail home inspections specifically due to crawl space moisture issues. Excessive moisture in crawl spaces leads to structural wood rot, mold growth, and pest attraction. In humid climates or properties with poor drainage, crawl space encapsulation and dehumidification systems may be necessary, costing $3,000–$8,000+.
When to Order a Crawl Space Inspection
- For homes with crawl spaces showing moisture signs
- In humid climates where moisture is common
- If general inspection shows wood rot or pest activity
- Before purchasing older homes with crawl space foundations
- When planning renovation or structural work in crawl areas
Cost: $400–$800 | Time: 1–2 hours | When: If general inspection identifies moisture or pest concerns
Mold Inspections: When That Smell Won't Go Away
From the HouseProbe Community
"There's a musty smell in the basement but I can't see any mold. Is that normal for older houses or should I be worried?"
A musty smell almost always means moisture is present, even if you can't see visible mold. Mold often grows behind walls, under flooring, and in hidden cavities. A professional mold inspection with air quality testing can tell you exactly what's going on.
A mold inspection and testing involves comprehensive visual assessment and laboratory analysis to identify mold presence, type, and extent. While general home inspectors can identify visible mold, mold specialists provide detailed sampling, air quality testing, and moisture source identification. Mold testing is essential when water damage is present or when occupants report allergic reactions and respiratory issues.
What's Included in Mold Inspections
- Visual inspection of attic, basement, crawl space, bathrooms
- Moisture source identification and assessment
- Surface mold sampling (tape, swab, bulk samples)
- Air quality testing (spore count analysis)
- Humidity and moisture meter readings
- Laboratory analysis and interpretation
- Remediation recommendations and protocols
- Post-remediation verification testing
Mold Remediation Costs
Small mold remediation (under 10 sq ft) costs $500–$2,000, while extensive mold treatment affecting large areas can reach $10,000+. Mold inspections identify the extent and cost of remediation before purchase, allowing buyers to negotiate price reductions or require seller remediation.
When to Order Mold Inspection & Testing
- If general inspection identifies water damage or staining
- When property has history of water intrusion or flooding
- If occupants report allergies or respiratory issues
- When basements or crawl spaces show dampness or odors
- In water-damaged properties requiring full assessment
Cost: $500–$1,500 (testing only) | Time: 2–3 hours | When: If water damage or mold smell present
Radon Testing: The Invisible Hazard
Radon is a colorless, odorless, radioactive gas that seeps up from soil and rock beneath homes. It's the second leading cause of lung cancer after smoking, and the only way to know if your home has a problem is through testing. Professional radon testing measures indoor radon concentrations and helps determine if mitigation systems are needed.
Radon Testing Methods
- Short-Term Tests (2–7 days): Quick results for real estate transactions; measured in pCi/L
- Long-Term Tests (3–12 months): More accurate annual average; captures seasonal fluctuations
- Continuous Monitors: Real-time measurement; most accurate for detailed data
- DIY Kits: Budget option; requires careful placement and following instructions precisely
Radon Action Levels
- Below 2 pCi/L: Low radon; no action required
- 2–4 pCi/L: Moderate radon; consider mitigation if occupants are at higher risk
- 4–10 pCi/L: Elevated radon; mitigation recommended
- Above 10 pCi/L: High radon; urgent mitigation recommended
When to Order Radon Testing
- In areas with known high radon levels (EPA radon zones 1–2)
- For any home below grade level (basements, split-level)
- If building has cracks in foundation or crawl space
- Standard practice in many regions as part of home purchase
- Before closing on any home
Cost: $150–$500 | Time: 2–7 days (plus analysis) | When: Standard for most home purchases, especially in high-radon areas
Foundation Inspections: Is Your Home Sinking?
Foundation specialists provide detailed structural assessment including soil analysis, foundation type evaluation, crack assessment, settling evaluation, and waterproofing adequacy. This goes far beyond general inspector observations to include professional recommendations for repair and long-term monitoring.
What's Included in Foundation Inspections
- Structural crack analysis and severity assessment
- Foundation type and material condition evaluation
- Settling and deflection measurement
- Water intrusion and moisture assessment
- Drainage system adequacy
- Soil condition and expansive soil testing
- Structural stability recommendations
- Estimated remaining foundation life
When to Order Foundation Inspection
- If general inspection notes foundation cracks or settling
- For older homes (50+ years) with aging foundations
- In areas prone to foundation problems (clay soil, flooding)
- If basement shows water intrusion or damp conditions
- When signs of structural movement are visible
Cost: $400–$800 | Time: 2–3 hours | When: If general inspection flags foundation concerns
Electrical Inspections: Is This House a Fire Hazard?
Electrical specialists evaluate the entire electrical system including panel capacity, grounding, bonding, outlet safety, circuit protection, and code compliance. They identify outdated systems, safety hazards, and needed upgrades. This is more thorough than general inspector evaluation.
What's Included in Electrical Inspections
- Panel amperage and condition assessment
- Breaker evaluation and capacity
- Grounding and bonding verification
- Outlet and switch safety testing
- GFCI and AFCI protection adequacy
- Wiring method and insulation condition
- Code compliance assessment
- Load calculations and circuit analysis
When to Order Electrical Inspection
- For homes 50+ years old with original electrical
- If general inspection notes outdated systems
- For homes with cloth or knob-and-tube wiring
- If planning major renovations requiring new circuits
- When buying homes that previously experienced electrical fires
Cost: $300–$600 | Time: 2–3 hours | When: If general inspection identifies electrical concerns or system is very old
Plumbing Inspections: Are Your Pipes Corroding?
Plumbing specialists evaluate supply lines, drainage systems, water pressure, hot water capacity, and material condition. They can identify corroding pipes, inadequate drain slopes, and capacity issues before they become expensive emergencies. Camera inspection of drain lines reveals internal corrosion and blockages.
What's Included in Plumbing Inspections
- Supply line material and condition
- Water pressure testing
- Drainage slope and flow assessment
- Sewer line video inspection (when available)
- Water heater condition and capacity
- Fixture condition and function
- Code compliance verification
- Corrosion and material deterioration assessment
When to Order Plumbing Inspection
- For homes 40+ years old with original plumbing
- If water pressure is low or inconsistent
- When general inspection finds corroded pipes
- For homes with galvanized or poly-b pipes
- When purchasing older homes with unknown plumbing history
Cost: $300–$600 | Time: 2–3 hours | When: If general inspection notes plumbing concerns or system is outdated
Roof Inspections: How Much Longer Will It Last?
Roofing specialists provide detailed shingle/material condition assessment, remaining life estimation, structural integrity evaluation, and ventilation adequacy review. They climb on the roof and inspect closely, identifying damage, wear, and needed maintenance. General inspectors often view roofs from the ground only.
What's Included in Roof Inspections
- Shingle/material condition assessment
- Flashing inspection around penetrations
- Gutter and downspout evaluation
- Soffit, fascia, and ventilation assessment
- Attic ventilation and temperature review
- Estimated remaining roof life
- Maintenance and repair recommendations
- Structural support condition (if accessible)
When to Order Roof Inspection
- For homes with roofs 15+ years old
- If general inspection notes roof wear or damage
- When purchasing homes in harsh climates (hail, salt spray)
- Before insurance company renewal (some require recent inspection)
- When roof has visible damage or missing shingles
Cost: $300–$500 | Time: 1–2 hours | When: If roof is old or shows visible damage
How to Choose Which Inspections You Need
Start with the general inspection. Based on findings and your property's characteristics, decide on specialty inspections. Here's the decision tree:
General Inspection Shows Concerns?
- Moisture in basement/crawl space: Order crawl space and mold inspection
- Foundation cracks or settling: Order foundation specialist evaluation
- Old electrical system: Order electrical inspection
- Old plumbing, low pressure, or corrosion: Order plumbing inspection
- Roof is 15+ years old or shows damage: Order roof inspection
Regional Concerns?
- High-radon area: Always order radon testing
- Termite-prone region: Order pest inspection
- Area with expansive clay soils: Consider foundation inspection
Other Considerations
- Home age: Older homes (50+ years) warrant more specialty inspections
- Known prior issues: If seller discloses problems, get specialist evaluation
- Gut feeling: If something seems off, get it checked; peace of mind is worth it
Pro Tip
Ask your general home inspector to recommend specialty inspections. They've seen thousands of homes and know which issues are worth investigating further. Their recommendations are usually sound and economical.
Real questions from homeowners like you
“Our realtor said we should get a ‘general inspection’ and then maybe a separate mold and radon test. That’s three different inspectors? Is this normal or is she just trying to slow down our closing?”
It’s normal to use different specialists. One inspector does the general inspection, then you can add radon testing and mold screening if needed. Your realtor is protecting your interests, not delaying anything.
“There’s a musty smell in the basement but I can’t see any mold. Is that normal for older houses or should I be worried?”
A musty smell almost always means moisture is present, even if you can’t see visible mold. Mold often grows behind walls, under flooring, and in hidden cavities. A professional mold inspection with air quality testing can tell you exactly what’s going on.
“I noticed a crack running along the basement wall. It’s about 1/4 inch wide. Is that a deal breaker or am I panicking over nothing?”
A 1/4 inch crack isn’t automatically a deal breaker, but it does warrant a foundation specialist’s opinion. Hairline cracks are usually cosmetic. Wider cracks, especially horizontal ones, can indicate structural movement. A foundation inspection tells you whether it’s $300 to seal or $30,000 to repair.
“The water pressure at the house we’re looking at seemed fine during the showing. Do we really need a separate plumbing inspection?”
Water pressure during a showing only tells you what’s happening right now. A plumbing inspection checks pipe material (galvanized steel corrodes from inside), sewer line condition, and hidden leaks. If the home is pre-1980, a plumbing inspection can save you from a surprise $15,000 re-pipe.
“House is from 1952. Do I need a specialty inspection for the wiring or will the general inspector catch if something’s dangerous?”
A general inspector will flag obvious electrical hazards, but older homes benefit from a dedicated electrical inspection. For a 1952 home, definitely add that specialty inspection—it’s one of the most important for older properties.