Average Home Inspection Repair Costs: What to Expect

Foundation repairs have the widest cost range of any inspection category because the scope can vary enormously: Hairline crack sealing (cosmetic): $250-$800. Simple epoxy or polyurethane injection to seal non-structural cracks. This is a maintenance item, not a structural repair. Carbon fiber strap reinforcement: $500-$1,200 per strap. Used to stabilize bowing basement walls that have moved less than 2 inches. Typically 3-5 straps are needed per wall, totaling $2,500-$6,000. Helical or push pier installation: $1,000-$3,000 per pier. Piers are driven to stable soil or bedrock to support a settling foundation. A typical job requires 6-12 piers, totaling $6,000-$36,000. Full foundation underpinning: $20,000-$50,000+. Required when the foundation has failed to the point where piers alone cannot stabilize the structure. Crawl space structural repair: $2,000-$8,000. Replacing deteriorated support posts, beams, or joists in a crawl space foundation. The critical factor is diagnosis. A $300 structural engineer's assessment will tell you exactly which repair is needed and prevent you from either overpaying for an unnecessary repair or underpaying for an inadequate one.

Roofing costs depend heavily on the roofing material, pitch, and total square footage: Spot repair (missing shingles, small leak): $300-$1,500. Patching a localized area without replacing the entire roof. Full asphalt shingle replacement (most common): $8,000-$15,000 for a standard 1,500-2,500 sq ft home. This includes tear-off, new underlayment, new shingles, flashing, and cleanup. Metal roof replacement: $15,000-$30,000. Higher upfront cost but 40-60 year lifespan. Flat roof replacement (TPO/EPDM): $5,000-$12,000 depending on square footage. Flashing repair: $200-$600 per area. Flashing around chimneys, vents, and wall junctions is a common failure point. Gutter replacement: $1,000-$3,000 for a full set of seamless aluminum gutters. The age and condition of the roof are the most frequently negotiated items after a home inspection. If the roof has 5 or fewer years of remaining life, expect to negotiate 50-100% of the replacement cost as a seller credit.

Electrical repairs range from inexpensive outlet-level fixes to major panel and wiring overhauls: GFCI outlet installation: $150-$300 per outlet. Required in kitchens, bathrooms, garages, basements, and exterior locations. Double-tapped breaker correction: $150-$300 per breaker. A common finding that is easy and inexpensive to fix. Electrical panel replacement: $2,000-$4,500. Required for Federal Pacific, Zinsco, or undersized panels. Add $1,000-$1,500 if upgrading from 100-amp to 200-amp service. Aluminum wiring remediation: $3,000-$10,000. Installing COPALUM connectors at every junction point, or partial rewiring of the most critical circuits. Knob-and-tube wiring replacement: $8,000-$15,000 for a full rewire of a typical 1,500 sq ft home. This requires opening walls and ceilings, adding significant drywall repair costs. Full home rewire (any reason): $8,000-$15,000. The cost is primarily labor for running new wire through existing walls. Smoke/CO detector installation: $30-$50 per unit for battery-operated, $100-$200 per unit for hardwired. A home typically needs 6-10 detectors.

Plumbing costs depend on whether the work is accessible (under a sink) or buried (under a slab or in a wall): Fixture leak repair: $150-$400 per fixture. Faucet, toilet, or supply line leaks that are accessible. Water heater replacement: $1,200-$3,000 for a standard tank unit, $3,000-$5,500 for a tankless unit. Water line repair (accessible): $300-$1,500 for a section of visible pipe. Main water line replacement (yard): $2,000-$6,000. Replacing the line from the street to the house. Sewer line repair (spot repair): $1,500-$4,000. Digging up and replacing a short section of the sewer line. Sewer line replacement (full): $5,000-$25,000 depending on length, depth, and whether the line runs under a driveway or structure. Whole-house replumb: $4,000-$10,000. Required for homes with polybutylene or severely corroded galvanized piping. Typically done with PEX, which can be fished through walls with minimal drywall damage. Septic system replacement: $10,000-$30,000. Includes new tank and drain field.

HVAC costs vary significantly by system type and whether you are repairing or replacing: Minor repairs (capacitor, contactor, thermostat): $150-$500. Common maintenance items. Blower motor replacement: $400-$900. Compressor replacement: $1,500-$3,000. At this cost, replacement of the entire condenser unit often makes more sense. Furnace replacement: $3,000-$6,000 for a standard efficiency gas furnace, $5,000-$9,000 for a high-efficiency unit. Air conditioning condenser replacement: $2,500-$5,000. Complete HVAC system replacement (furnace + AC + coil): $5,000-$12,000. Heat pump system: $4,000-$8,000 for a standard air-source heat pump. Ductwork repair or replacement: $1,000-$5,000 depending on accessibility and extent. HVAC systems have a typical lifespan of 15-20 years. If the system in the home you are buying is past this age, budget for replacement within 1-3 years even if it is currently functioning.

Moisture-related repairs are particularly variable because the visible damage is often just the tip of the iceberg: Minor mold remediation (less than 10 sq ft): $500-$1,500. Small, accessible areas like a bathroom ceiling or under a sink. Major mold remediation (basement, crawl space, attic): $3,000-$15,000. Requires containment, HEPA filtration, removal of affected materials, and treatment of remaining surfaces. Basement waterproofing (interior drain system): $3,000-$10,000. Installing a perimeter drain and sump pump inside the basement. Exterior waterproofing: $5,000-$15,000. Excavating around the foundation and applying waterproof membrane. Crawl space encapsulation: $3,000-$8,000. Vapor barrier, dehumidifier, and drainage to eliminate moisture. Water damage repair (drywall, insulation, framing): $1,000-$5,000 depending on extent. Includes drying, demolition of damaged materials, and replacement. The critical question with moisture issues is whether the source has been identified and corrected. Remediating mold without fixing the water source is throwing money away.

Exterior items are generally less expensive than the major systems but can add up: Grading correction: $500-$3,000. Regrading soil around the foundation to direct water away from the house. French drain installation: $1,000-$4,000. A buried perforated pipe that redirects groundwater. Deck repair or replacement: $1,000-$5,000 for repair of structural members, $5,000-$15,000 for full replacement. Siding repair: $500-$3,000 depending on material and extent. Chimney repair: $500-$3,000 for crown, cap, and flashing repair. $5,000-$15,000 for structural chimney rebuild. Driveway replacement: $3,000-$8,000 for concrete, $2,000-$5,000 for asphalt. Retaining wall repair: $1,000-$5,000. Costs increase significantly if the wall is large or structural. Tree removal (if encroaching on structure): $500-$3,000 per tree including stump removal.