Why Inspections Matter

A home inspection costs $350-$600. Skipping it to make a competitive offer can cost $10,000-$100,000+ in hidden problems. Even in seller’s markets, an inspection contingency or at minimum an informational inspection is worth the investment.

Here are the findings that experienced inspectors flag as the most expensive.

Foundation Issues: $5,000-$50,000+

What to Look For

  • Horizontal cracks in basement/crawlspace walls (hydrostatic pressure — serious)
  • Stair-step cracks in brick or block foundation (differential settling)
  • Doors and windows that don’t close properly (structural movement)
  • Sloping floors (measure with a level — more than 1/2” over 20 feet is concerning)
  • Water staining or efflorescence on foundation walls

Cost to Fix

  • Minor crack repair: $500-$1,500
  • Carbon fiber strap reinforcement: $3,000-$8,000
  • Helical pier underpinning: $10,000-$30,000
  • Full foundation replacement: $30,000-$100,000+

Foundation repairs often require engineering assessment ($500-$1,500) before the scope of work can even be determined.

Roof: $8,000-$25,000

Red Flags

  • Age over 20 years (asphalt shingles)
  • Curling, buckling, or missing shingles
  • Daylight visible from attic
  • Multiple layers of shingles (indicates previous overlay, next repair requires full tear-off)
  • Sagging roof deck (structural issue, not just shingles)
  • Active leaks or water stains in attic

Roof age is the single most impactful finding for insurance. Many carriers won’t insure homes with roofs over 15 years old, or they’ll only offer actual cash value coverage instead of replacement cost.

Electrical: $3,000-$15,000

Dangerous Panels

  • Federal Pacific Stab-Lok: Known fire hazard, breakers fail to trip. Replace: $2,500-$4,000.
  • Zinsco/Sylvania: Similar failure issues. Replace: $2,500-$4,000.
  • Fuse boxes: Not a safety hazard per se, but insufficient for modern electrical loads. Upgrade: $2,000-$4,000.

Wiring Concerns

  • Knob and tube (pre-1950): Fire risk, no ground wire, incompatible with insulation. Rewire: $8,000-$15,000.
  • Aluminum wiring (1965-1973): Expansion/contraction at connections causes overheating. Remediation: $3,000-$8,000.
  • Ungrounded outlets: Safety hazard. Adding grounds: $150-$300 per outlet.

Plumbing: $2,000-$20,000

Material Red Flags

  • Polybutylene pipe (1978-1995): Known failure rate, may be uninsurable. Replace: $5,000-$15,000.
  • Galvanized steel (pre-1960): Corrodes internally, reducing flow and water quality. Replace: $5,000-$15,000.
  • Cast iron drain lines (pre-1970): Deteriorate over 50+ years. Replace: $3,000-$10,000.
  • Lead service line: Health hazard. Replace: $3,000-$8,000.

Active Issues

  • Low water pressure (may indicate corroded pipes or municipal supply problem)
  • Slow drains (tree root intrusion, bellied pipe, or buildup)
  • Water heater age (over 10 years = approaching failure)

HVAC: $3,000-$15,000

Concerning Findings

  • Age over 15 years (approaching end of life)
  • R-22 refrigerant system (phased out, refills cost $100+/lb)
  • Cracked heat exchanger (carbon monoxide risk — requires immediate replacement)
  • Undersized for the home (constant running, inadequate temperature control)
  • Poor airflow (ductwork problems, dirty coils, failing blower motor)

Moisture and Mold: $2,000-$30,000

Sources

  • Grading sloping toward foundation (water intrusion)
  • Missing or damaged gutters/downspouts
  • Bathroom exhaust venting into attic (moisture/mold risk)
  • Crawlspace without vapor barrier
  • Visible mold on framing, drywall, or insulation

Mold remediation costs depend entirely on extent. A small bathroom mold issue might be $500. Widespread attic or basement mold can run $5,000-$30,000.

What to Do With Red Flags

  1. Get specialist assessments for major findings (structural engineer, licensed electrician, licensed plumber)
  2. Get repair estimates from two qualified contractors
  3. Negotiate: Request seller repair, price reduction, or concession based on estimates
  4. Know your walk-away threshold. If total estimated repair cost exceeds 5-10% of purchase price, reconsider.
  5. Factor repairs into total ownership cost. HomeStats shows replacement reserves by state — add immediate repair needs on top of those ongoing costs.

The Resale Trap includes a pre-purchase inspection checklist and cost guide for every major system, helping you evaluate whether a home’s condition makes it a deal or a money pit.