A home inspection can make or break your real estate deal—missing major red flags now could cost you tens of thousands in repairs later. During a typical 2–3 hour inspection, a qualified inspector checks everything from the foundation to the roof, but knowing which issues demand immediate attention separates informed buyers from those caught off guard. Understanding what to prioritize helps you negotiate confidently or walk away before you're legally bound.
Structural and Foundation Problems
The foundation is the house's backbone, and cracks or shifts signal expensive trouble ahead. Look for horizontal cracks wider than 1/8 inch, stair-step patterns in brick or concrete, or gaps between walls and the foundation—these aren't cosmetic. Bowing basement walls, uneven floors, or doors that stick in their frames often indicate settling or water damage that can require $10,000–$50,000+ in repairs depending on severity.
During your inspection walkthrough, ask the inspector to mark the location and direction of any cracks on a diagram. Request a structural engineer's report if the inspector flags anything beyond minor hairline cracks; this $300–$500 investment now prevents a $30,000 surprise later.
Roof and Water Intrusion Issues
A failing roof is one of the most expensive fixes in real estate. Inspectors check shingle condition, flashing around chimneys and vents, and signs of active leaks or rot. If the roof is nearing the end of its 20–25 year lifespan and shows worn, missing, or curling shingles, budget $8,000–$15,000 for replacement.
Water damage is the silent killer. Check attic insulation for dark stains, soft spots in ceilings or drywall, and mold growth. Any evidence of past or active leaks warrants a closer look—mold remediation alone runs $2,000–$6,000 depending on extent. Ask for documentation of previous repairs and whether the issue was actually resolved or just temporarily patched.
HVAC and Electrical Systems
Heating and cooling systems typically last 15–20 years. An aging furnace or air conditioner nearing replacement will cost $4,000–$8,000 to swap out. The inspector should verify the system runs and note its age; if it's 18+ years old, expect major work soon.
For electrical, watch for:
- Outdated knob-and-tube wiring (fire hazard; replacement costs $8,000–$15,000)
- Aluminum wiring (prone to overheating; requires special handling)
- Improper grounding or too few outlets for the home's size
- A breaker panel over 30 years old or showing rust/corrosion
These electrical issues aren't cosmetic and often require licensed electrician involvement, which adds $1,500–$5,000 minimum.
Plumbing Red Flags
Old galvanized pipes corrode from the inside out and can fail suddenly. If the home was built before 1960 and still has original plumbing, copper or PEX replacement might run $10,000–$25,000. During inspection, ask the plumber or inspector to run water from multiple fixtures simultaneously to check water pressure—low pressure suggests problems inside walls.
Watch for water stains under sinks, spongy flooring near bathrooms, or sewage odors. If the home uses a septic system, confirm the last inspection and pumping date; a neglected system costs $3,000–$5,000 to pump and potentially much more if the drain field has failed.
Hazardous Materials and Code Issues
Homes built before 1980 may contain asbestos in insulation, floor tiles, or roofing. Lead paint is common in pre-1978 homes. Neither is dangerous if undisturbed, but renovation or removal requires certified professionals and can add 10–20% to project costs. Request an environmental assessment if you plan renovations.
Also note any unpermitted additions, missing building permits for recent work, or code violations the inspector identifies. These create liability and can complicate future sales; some require formal correction by licensed contractors.
Frequently Asked Questions
Q: How much does a typical home inspection cost, and when should I schedule it? A: Most inspections run $300–$500 depending on home size and complexity; schedule one immediately after making an offer but before the closing deadline, typically within 7–10 days.
Q: Should I attend the inspection? A: Yes—walking through with the inspector lets you ask questions directly and see issues firsthand rather than relying solely on the written report.
Q: Can a seller be forced to fix inspection issues? A: Not automatically; most jurisdictions allow you to request repairs, renegotiate price, or cancel if major issues exist and the seller refuses to address them, depending on your contract terms.
Find trusted, vetted home inspectors in your area and compare credentials through Mercoly to ensure you're hiring someone experienced with your home's age and condition.