Home Inspection Cost Calculator

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Most buyers hear one number for a home inspection and have no idea if it is fair. The truth is that the price moves with the house: square footage, age, what is under the floor, where you live, and which extra tests you order.

This home inspection cost calculator does that math for you. Enter the property details, check any add-on tests you are considering, and you get an estimated total, a realistic high-low range, and how long the inspector will likely be on site.

A general home inspection on a typical 2,200 sq ft single-family home runs about $436 in an average U.S. market, and roughly $300 to $700 once you account for size, age, and location. Add-on tests like radon, sewer scope, or septic can add $110 to $350 each.

How to use this home inspection cost calculator

1. Pick the property type. Condos and townhomes price lower than detached homes because there is less exterior, roof, and mechanical equipment to inspect. Duplex, triplex, and fourplex add a fee per extra unit, since each unit has its own kitchen, furnace, water heater, and panel.
2. Enter heated or finished square footage. Use the number from the listing or county record. Do not count an unfinished basement, attic, or garage; those are inspected, but they are not priced as living area.
3. Choose the age band. Older homes take longer and carry more risk items, so the fee steps up.
4. Choose the foundation. A slab is fast. A crawl space means the inspector is physically going under the house, which is the single biggest time and hassle factor in a standard inspection.
5. Set your market. Pricing follows local labor costs, not national averages.
6. Check add-on tests. Only the ones you actually want. Each one has a real cost and a real reason.
7. Hit calculate, then use Copy Summary to paste the estimate into your notes or a text to your agent.

What a home inspection costs in 2026

Here is the base price the calculator uses for a standard single-family home in an average-cost market, before age, foundation, and add-ons:

Home size (heated sq ft)	Estimated base fee
Up to 1,000	$330
1,500	$373
2,000	$415
2,500	$468
3,000	$520
3,500	$583
4,000	$645
4,500	$708
5,000	$780
6,000	$925

Other property types start from a different base:

Property type	Typical estimate	Why it differs
Condo / apartment unit, 1,100 sq ft	~$283	No roof, no foundation, no exterior envelope in scope
Townhome, 1,800 sq ft	~$383	Shared walls, but you own the roof and mechanicals
Manufactured home, 1,600 sq ft	~$327	Smaller footprint, but skirting, tie-downs, and piers get checked
Duplex, 2,400 sq ft	~$592	Base fee plus $135 for the second unit
Triplex, 3,000 sq ft	~$790	Base fee plus $270 for two extra units
Fourplex, 4,000 sq ft	~$1,050	Base fee plus $405 for three extra units

Things that move your price are:

Square footage

Size is the main driver, but the rate is not linear. The first 1,000 sq ft carries the fixed cost of showing up, setting up, and writing the report. After that, each additional square foot adds a smaller amount, which is roughly 8.5 cents per sq ft between 1,000 and 2,000, rising to about 14.5 cents per sq ft above 4,500. Big houses cost more because of ladders, multiple HVAC systems, and extra bathrooms, not because of floor area alone.

Age of the home

Age band	Added cost	What the inspector is looking for
New construction (under 5 yrs)	$0	Builder shortcuts, missed punch-list items, grading and drainage
Modern (5–20 yrs)	$0	First-round wear: water heater, roof seals, HVAC capacitor life
Aging (21–40 yrs)	+$45	Original HVAC and roof near end of life, polybutylene or CPVC supply lines
Older (41–70 yrs)	+$85	Aluminum branch wiring, ungrounded outlets, cast iron drains, asbestos-era materials
Historic / pre-1950	+$145	Knob-and-tube remnants, galvanized supply, undersized panels, structural settling

Foundation type

Foundation	Added cost	Reality check
Slab-on-grade	$0	Fastest to inspect, but hides plumbing leaks under concrete
Finished basement	+$35	Finishes cover the framing, so less is visible
Unfinished basement	+$45	Best-case visibility for framing, plumbing, and wiring
Crawl space	+$80	Inspector suits up and goes under; moisture, vapor barrier, joist rot
Pier & beam / raised	+$60	Pier settlement, beam sag, sistered joists
Combination / multi-level	+$75	Two systems, two sets of transitions and failure points

Where the home is

The same 2,500 sq ft house does not cost the same everywhere:

Market	Multiplier	Estimate on a 2,500 sq ft home
Low-cost / rural	0.85×	~$398
National average / moderate metro	1.00×	~$468
High-cost metro (Seattle, Denver, Chicago)	1.20×	~$561
Very high-cost (SF Bay, NYC, Boston, Hawaii)	1.38×	~$645

The multiplier applies to add-on tests too, because lab fees and technician time scale with the same local costs.

Add-on inspections: cost and when they are worth it

This is where most buyers either overspend or leave themselves exposed. Use the middle column as a price check and the right column as a decision rule.

Add-on test	Cost (avg market)	Order it when…
Radon continuous test	$150	The home is in an EPA Zone 1 or 2 county, or has any below-grade living space. Mitigation runs $1,000–$2,500, so this is cheap information.
Sewer scope video	$235	The home is 25+ years old, has large trees near the lateral, or has cast iron or clay pipe. A collapsed lateral is a $6,000–$25,000 repair.
Termite / WDO pest	$110	Almost always in the Southeast, Gulf Coast, and Southwest. Often required for VA loans.
Mold sampling lab kit	$275	Only when there is visible growth, a musty smell, or a known past leak. Skip speculative testing.
Thermal infrared scan	$140	You suspect hidden moisture, missing insulation, or overheating breakers. Great value on newer builds and flip properties.
Well water lab test	$180	Any private well; non-negotiable. Test for bacteria, nitrates, and local contaminants.
Septic system inspection	$350	Any septic property. Drain field replacement runs $8,000–$20,000.
Pool & spa equipment	$160	The home has a pool. Standard inspections exclude pool equipment.
Level 2 chimney flue	$175	The fireplace has been used, or the home is 40+ years old with a masonry chimney.
Detached garage / ADU	$125	There is a second structure with its own roof, wiring, or plumbing.

Rule of thumb: an add-on is worth buying when its cost is under 5% of the repair it could uncover. A $235 sewer scope against a $12,000 lateral replacement is a 2% insurance premium. A $275 speculative mold test with no visible symptoms usually is not.

Real examples

Example 1: First-time buyer, suburban starter home

2,200 sq ft single-family, built 2004, slab, average-cost market, no add-ons.

Estimate: $436 (range $392–$501), about 2.5–3.25 hours on site.

Example 2: 1965 ranch in Denver with a crawl space

2,600 sq ft, older home band, crawl space, high-cost metro, plus radon, sewer scope, and termite.

General inspection: $772. Add-ons: $594.

Estimate: $1,366 (range $1,229–$1,571), about 4–4.75 hours on site.

Example 3: Bay Area condo

1,100 sq ft, built 2012, slab, very high-cost market, no add-ons.

Estimate: $391 (range $352–$449), under 2.5 hours.

Example 4: Small investor buying a duplex

2,400 sq ft duplex, built 1988, unfinished basement, average market, sewer scope plus thermal scan.

General inspection: $637. Add-ons: $375.

Estimate: $1,012, about 3–3.75 hours.

What the price does and does not include

Included in a standard general inspection:

• Roof coverings, flashing, and visible drainage
• Structure, framing, and foundation as visible
• Electrical panel, breakers, grounding, and a sample of outlets
• HVAC operation and temperature differential
• Plumbing supply, drains, water pressure, and the water heater
• Attic insulation and ventilation
• Interior doors, windows, stairs, and safety items
• Built-in appliances (most inspectors)
• A written report with photos, usually within 24 hours

Not included unless you add it:

• Anything behind a wall, under concrete, or below grade
• Radon, mold, asbestos, lead, or water quality lab work
• The sewer lateral past the cleanout
• Pools, spas, sprinklers, and detached structures
• Code compliance, permit history, and appraisal value
• Cost estimates for repairs (most inspectors deliberately do not price repairs)

How to lower the cost without lowering the quality

1. Bundle at booking. Most inspectors discount $25–$75 when radon, termite, or a sewer scope is scheduled with the general inspection instead of as a second trip.
2. Do not pay for a re-inspection you can avoid. Ask the seller for receipts and permits from licensed contractors instead of a $150 re-visit for minor items.
3. Skip speculative testing. Mold and asbestos testing without a visible trigger is usually money spent to confirm nothing.
4. Ask about a pre-listing inspection if you are selling. Same price, but it removes the buyer’s biggest negotiation lever.
5. Do not shop on price alone. A $250 inspection with a 12-page checklist report costs far more than a $500 inspection that finds a failing heat exchanger.

How to read the estimate you just got

• The total is the most likely price for that property profile in that market.
• The range (about 10% below to 15% above) reflects real quote spread between a solo inspector and a multi-inspector firm with same-day reporting.
• The on-site time matters more than most buyers realize. Under two hours on a 3,000 sq ft home is a red flag. Walk the home with the inspector if you can; the conversation is worth more than the PDF.
• If a quote comes in more than 20% under your range, ask what is excluded. It is usually the report detail, the crawl space entry, or the attic.

Questions to ask before you book

• Are you licensed in this state, and are you InterNACHI or ASHI certified?
• How many inspections have you done on homes of this age and foundation type?
• Do you enter crawl spaces and walk roofs, or do you inspect from the ground?
• How long is the inspection, and can I attend?
• When do I get the report, and does it include photos and a summary of major items?
• Do you carry errors and omissions insurance?
• Do you or your company also do repairs? (The answer should be no; that is a conflict of interest.)

Also See: Second Story Addition Cost Calculator

Frequently asked questions (FAQs)

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A Quick Note

This calculator is a planning tool, not a quote or an appraisal. It does not collect your information, and we do not sell leads to inspection companies. Prices are modeled on published fee structures from licensed inspectors across low, average, and high-cost U.S. markets, and are reviewed and updated as market rates change. If your local quotes consistently land outside the range shown, trust your local quotes.

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Technical Basis

This calculator uses published inspection fee structures from licensed inspectors, applying tiered square-footage pricing, documented surcharges for property age, foundation type, and extra units, and regional labor cost multipliers. Scope and add-on guidance follow InterNACHI and ASHI standards of practice, EPA radon zones, and state licensing requirements.

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Disclaimer

This tool provides cost estimates, not a quote, appraisal, or inspection report. Actual pricing varies by inspector, market conditions, property access, and local licensing rules. No personal information is collected or sold. Always confirm final pricing and scope directly with two or three licensed local inspectors.

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