How much does a home inspection cost in St. Louis?
A standard home inspection in St. Louis generally falls between $300 and $500 for a typical single-family home, though the final number depends on square footage, home age, and which add-on inspections you order. Buyers in Oakville, Arnold, Chesterfield, and Webster Groves routinely budget $400–$600 once sewer scope, radon, and termite are added to the base fee.
Key Takeaways
- A standard St. Louis home inspection for an average-sized house typically costs between $300 and $500 before add-ons.
- Sewer lateral scoping, radon testing, and termite/WDI inspections are the three most common add-ons St. Louis buyers order, and each carries a separate fee.
- Missouri does not have a state licensing program for home inspectors, so buyers should evaluate inspector credentials, experience, and sample reports directly.
- Termite and wood-destroying insect (WDI) inspections in Missouri are regulated under RSMo 281.116, meaning the inspector performing them must hold a qualifying Missouri pesticide/applicator credential.
- Older St. Louis homes, particularly those built before 1978, often cost more to inspect because of additional systems complexity, deferred maintenance patterns, and the time required to document them thoroughly.
What does a St. Louis home inspection cost by square footage?
Square footage is the single biggest driver of your base inspection fee. More square footage means more time on site, more systems to document, and a longer written report. Here's how pricing generally shakes out across the St. Louis market:
| Home Size (Approx. Sq. Ft.) | Typical Base Fee Range |
|---|---|
| Under 1,000 sq. ft. | $275 – $325 |
| 1,000 – 1,500 sq. ft. | $300 – $375 |
| 1,500 – 2,000 sq. ft. | $350 – $425 |
| 2,000 – 2,500 sq. ft. | $400 – $475 |
| 2,500 – 3,500 sq. ft. | $450 – $550 |
| 3,500+ sq. ft. | $525 – $700+ |
These are representative ranges based on quotes from inspection companies operating in the St. Louis metro. They are not a guarantee of what any one inspector will charge. I always tell my buyers to get two or three quotes and compare what's included in the base fee before deciding.
Age of home matters just as much as size. A 1,600-square-foot ranch built in 1955 in Oakville will almost always cost more to inspect than a 1,600-square-foot home built in 2005 in Chesterfield. Older homes have more to document: galvanized plumbing, knob-and-tube or aluminum wiring, older HVAC equipment, and decades of deferred maintenance patterns that a thorough inspector will flag in detail. Many St. Louis inspectors apply an age surcharge for homes built before the 1970s, typically adding $50–$100 to the base fee.
What's included in the standard inspection?
A standard general home inspection covers the major visible and accessible systems of the property. You can expect the inspector to evaluate:
- Roof(condition, flashing, gutters, visible penetrations)
- Foundation and structure(visible cracks, settlement signs, grading)
- Exterior(siding, trim, windows, doors, decks)
- Electrical system(panel, visible wiring, outlets, GFCIs)
- Plumbing(supply, drain, water heater, visible fixtures)
- HVAC(furnace, air conditioning, ductwork, filters)
- Insulation and ventilation
- Interior(walls, ceilings, floors, stairs, windows)
- Attached garage
The inspection does NOT include anything behind walls, inside buried pipes, or under concrete. That's exactly why the add-ons below matter so much for older St. Louis homes.
What do add-on inspections cost in St. Louis?
This is where your total inspection budget really takes shape. Most buyers I work with in the St. Louis area order at least one or two add-ons depending on the home's age and location. Here's what each typically costs and why it matters.
Sewer lateral inspection
Typical cost: $125 – $250. This is a camera scope of the underground sewer line running from the house to the municipal main. In older neighborhoods like Webster Groves, south St. Louis County, and parts of Arnold, many homes still have original clay or cast-iron sewer laterals that are 60 to 80 years old. Tree root intrusion, bellied pipe, and cracked sections are common findings. A sewer scope is one of the most valuable add-ons you can order in the St. Louis market because a lateral replacement can run several thousand dollars and is almost never visible during a standard inspection.
I walk every buyer through this decision before we schedule the inspection. If the home is pre-1980 and has mature trees on the lot, I strongly recommend the scope.
Radon testing
Typical cost: $100 – $175. Missouri sits in EPA Radon Zone 1 and Zone 2 across much of the St. Louis metro, meaning elevated radon levels are a real consideration. A radon test is typically a 48-hour passive canister or electronic monitor placed in the lowest livable area of the home. If results come back at or above 4.0 pCi/L, mitigation is recommended. Mitigation systems in St. Louis typically run $800–$1,500 and are often negotiated as a seller repair. Testing during the inspection period is the right time to get this done.
Termite and wood-destroying insect (WDI) inspection
Typical cost: $75 – $150. This one has a wrinkle specific to Missouri. Under RSMo 281.116, anyone performing a wood-destroying insect inspection for a real-estate transaction in Missouri must hold a qualifying Missouri pesticide/applicator credential. That means the person doing your termite inspection is not just any general home inspector who tacks it on. Many buyers order the WDI inspection through a separate pest control company, and some inspection firms bundle it only if they have a licensed applicator on staff.
Per NAR research, WDI inspections are among the most commonly required inspections in real-estate transactions nationally, and lenders on certain loan types may require a clear termite report before closing. Ask your lender early whether your loan type requires one.
Mold and air quality testing
Typical cost: $150 – $300+. Not every buyer orders this, but it becomes relevant when the general inspection turns up visible moisture intrusion, musty odors, or evidence of past flooding. St. Louis basements, particularly in older homes, are a common place where mold testing gets added after the general inspection reveals a concern. Full mold sampling with lab analysis runs on the higher end of this range.
Chimney inspection
Typical cost: $100 – $250. Many St. Louis homes have one or more fireplaces, and a Level 2 chimney inspection by a CSIA-certified chimney sweep goes beyond what a general inspector can document. If the home has a wood-burning fireplace or a gas insert, a dedicated chimney inspection is worth the cost.
How add-ons stack up for a typical older St. Louis home
Here's how a realistic inspection budget looks for a pre-1970 home in the 1,500–2,000 sq. ft. range:
| Inspection Type | Typical Cost Range |
|---|---|
| General home inspection | $375 – $475 |
| Sewer lateral scope | $125 – $250 |
| Radon test | $100 – $175 |
| Termite / WDI | $75 – $150 |
| Older-home age surcharge (est.) | $50 – $100 |
Your specific combination depends on the home's age, condition, and what turns up during the walkthrough. The only way to know exactly what you're looking at is to talk through the property with someone who knows this market.
How to choose a home inspector in St. Louis
Here's something that surprises a lot of buyers: Missouri does not have a state licensing program for home inspectors. According to the Missouri Division of Professional Registration, home inspectors are not among the professions licensed at the state level. That means you can't simply look up a Missouri home inspector license number the way you would for a contractor or real estate agent.
What this means for you as a buyer is that credentials, experience, and reputation carry more weight here than in states with mandatory licensing. When I refer inspectors to my clients, I look for:
- ASHI or InterNACHI membership, both the American Society of Home Inspectors (ASHI) and InterNACHI require members to meet training, exam, and continuing education standards
- Sample reports, ask to see a real report before you book; a thorough inspector's report runs 50–100 pages with photos
- Years of local experience, someone who has inspected hundreds of St. Louis-area homes will recognize patterns specific to local construction eras
- Errors and omissions (E&O) insurance, this protects you if something is missed
- Clear communication, the best inspectors walk you through the property during the inspection and explain findings in plain language
St. Louis County is the most populous county in Missouri, with a population estimate of 990,911 as of July 1, 2025 per the U.S. Census Bureau. That means there's no shortage of inspectors operating in this market, which is exactly why vetting them carefully matters.
This is one of those decisions where I tell my buyers: don't pick the cheapest inspector. Pick the most thorough one. The inspection fee is a few hundred dollars. A missed issue can cost tens of thousands.
Frequently Asked Questions
How much does a home inspection cost in St. Louis for a 1,500 sq. ft. house?
For a 1,500 sq. ft. home, expect to pay roughly $325–$425 for the base general inspection in St. Louis. If the home is older, add $50–$100 for an age surcharge. Most buyers in this size range budget $400–$600 total once radon, sewer scope, and termite are factored in.
Is a sewer lateral inspection worth it for older St. Louis homes?
Yes, for most pre-1980 homes in the St. Louis area, a sewer scope is one of the highest-value add-ons you can order. Clay and cast-iron laterals in neighborhoods like Webster Groves, south St. Louis County, and Arnold are decades old, and root intrusion or pipe failure is a common finding. A lateral replacement can cost several thousand dollars, so $125–$250 for a camera scope is well-spent insurance.
Do Missouri buyers need a licensed home inspector?
Missouri does not have a state licensing program for home inspectors, so there is no state license to verify. Buyers should instead look for inspectors with professional certifications like ASHI or InterNACHI membership, errors and omissions insurance, and verifiable local experience. Ask for a sample report before you book.
Is a termite inspection separate from the general home inspection in Missouri?
Yes, in Missouri a wood-destroying insect (WDI) inspection is a separate service regulated under RSMo 281.116, which requires the inspector to hold a qualifying Missouri pesticide/applicator credential. Many buyers order this through a separate pest control company, though some inspection firms can bundle it if they have a licensed applicator on staff. Your lender may also require a clear WDI report depending on your loan type.
Which inspections are most common for St. Louis buyers?
The three most common add-ons I see St. Louis buyers order alongside the general inspection are a sewer lateral scope, radon test, and termite/WDI inspection. For older homes with fireplaces, a chimney inspection is also common. The right combination depends on the home's age, condition, and what the general inspector flags during the walkthrough.
Why do older homes in St. Louis cost more to inspect?
Older homes take more time to inspect thoroughly because they have more complex and aged systems: galvanized plumbing, older electrical panels, aging HVAC equipment, and decades of repairs that need careful documentation. Many St. Louis inspectors apply an age surcharge for homes built before the 1970s, typically $50–$100 above the base fee, to account for the additional time on site.
Knowing what inspections to order, and in what order to prioritize them, is one of the first conversations I have with every buyer I work with. The total cost is real money, and it's money well spent when you understand what each inspection is actually telling you about the home.
If you're buying in Oakville, Arnold, Chesterfield, Webster Groves, or anywhere in the St. Louis metro and want to talk through your inspection strategy before you go under contract, call or text me at 314-374-3069 or send me an email. I'll walk you through exactly what I'd recommend for the specific home you're looking at.
Equal Housing Opportunity. Cheryl Carosone, Realtor, License #2024033029. Regulated by MREC, NAR, and MARIS. This article is general information only and does not constitute legal, tax, or financial advice. Confirm inspection requirements, costs, and contract terms with your inspector, closing agent, tax advisor, or lender.
