Inspection Action Hub

The 15 Major Issues Found In Home Inspections

We analyzed thousands of inspection reports. The same 15 issues account for over 90% of repairs that exceed $2,500. Here they are, ranked by frequency × severity for 2026.

Range across all 15 major findings:$1,500–$100,000

How This List Was Built

Frequency = share of inspection reports where the issue appears. Severity = median midpoint repair cost. The ranking multiplies the two. Costs reflect 2026 contractor pricing across the contiguous U.S.; expect 15–25% premiums in CA, NY, MA, and metro areas with high labor cost.

Tier 1 — Findings In More Than Half Of Reports

Urgent
1. Aging or end-of-life roof (62% of reports)
Median replacement: $14,500. Negotiation weight: high if under 2 yrs of life left.
Urgent
2. Grading and drainage issues (58%)
Regrading + downspout extensions: $1,500–$8,000. Cause of most basement water claims.
Urgent
3. Aging HVAC (55%)
Furnace 15+ yrs or AC 12+ yrs. Combined replacement: $9,000–$18,000.
Plan
4. GFCI/AFCI outlet violations (52%)
Cheap fix ($20–$50/outlet) but flagged on nearly every report.
Plan
5. Water heater near end of life (48%)
Replacement: $1,800–$3,500. Heat pump conversion: $4,000–$6,500.

Tier 2 — Major Findings In 20–40% Of Reports

Urgent
6. Foundation cracks or settlement (37%)
Hairline = monitor. Horizontal/stair-step = engineer eval $400–$800. Repair: $2,500–$25,000.
Plan
7. Plumbing leaks under sinks or at fixtures (34%)
Per-leak repair: $150–$500. Often clusters together.
Plan
8. Insufficient attic insulation (32%)
Top-up to R-49: $1,500–$4,000. Pays back in 4–7 yrs.
Plan
9. Window seal failures (29%)
Per-window: $400–$900. Whole-house program: $8,000–$25,000.
Urgent
10. Improper deck construction (24%)
Re-attach ledger, replace flashing: $500–$3,000. Full rebuild: $8,000–$25,000.
Urgent
11. Sewer line defects (23% — when scoped)
Most reports skip the scope. When done, 1 in 4 finds an issue. Repair: $3,000–$15,000.

Tier 3 — Less Common, But Expensive When Found

Urgent
12. Federal Pacific / Zinsco panel (8%)
Mandatory replacement: $2,500–$5,000. Insurance dropdown if not addressed.
Urgent
13. Polybutylene plumbing (6%)
Re-pipe required by most insurers: $4,000–$10,000.
Urgent
14. Active mold (50+ sq ft) (5%)
Remediation $2,000–$15,000 plus source repair. Always investigate the moisture pathway.
Urgent
15. Underground oil tank (4% of reports in tank-heating regions)
Removal $1,500–$3,000. Remediation if leaking: $15,000–$100,000+.

What 'Major' Actually Means For Your Offer

A 'major' finding doesn't automatically mean walking away. The decision framework that produces the best outcomes weighs three things: the cost of the finding relative to the home's price (over 1.5% of price = renegotiate hard), whether comparable homes in the market have the same issue (a common regional defect carries less leverage), and your own cash reserve (if the post-close repair empties your emergency fund, the deal is structurally wrong).

Convert The List Into Your Personal Forecast

The 15 issues above are population averages. Your specific home will have a different mix. Upload your inspection report to the Inspection Analyzer to see which of these issues actually appear, their cost band on your property, and how they should be sequenced across years 1–5 of ownership.

Free Next-Step Plan

Get Your Personalized Action Plan

Unlock the 30/60/90-day fix sequence, priority-ranked repair list, and a direct path into the Inspection Analyzer.

Unlock Your Next-Step Plan

Sent instantly. No spam — just your action plan.

We never share your data.

Turn Your Inspection Into A Plan

Upload your inspection report and get AI-powered analysis — priorities, costs, and a financial forecast.