You’ll most often see issues tied to structural movement, water entry, and safety. Watch for foundation cracks (especially horizontal/diagonal or wide vertical), sloping floors, and sticking doors that signal ongoing settlement. On the roof, missing or curled shingles, failed flashing, soft decking, and poor drainage can mean leaks or replacement. Plumbing red flags include staining, damp odors, hidden leaks, and risky supply lines. Electrical defects like knob-and-tube, aluminum wiring, and missing GFCIs require correction. Keep going to learn how to assess severity and next steps.
Foundation Red Flags in a Home Inspection
Although some minor settlement is normal, your inspection should treat certain foundation symptoms as immediate red flags: horizontal or diagonal cracks in the foundation or walls, wide vertical cracks (large enough to fit a coin), noticeably sloping or sagging floors, doors and windows that bind or won’t latch, and gaps where walls meet floors or ceilings.
Document crack location, direction, and width; horizontal/diagonal cracking and large wall or slab breaks can indicate structural failure and warrant a licensed structural engineer. Treat old wooden foundations as higher-risk because repairs can be complex and costly. Verify floor levelness on multiple planes; a pronounced incline along one side or sagging at spans suggests instability beyond normal settlement, especially in older homes or clay-soil areas. Check openings: out-of-square frames and new gaps around doors/windows often track ongoing movement. Evaluate moisture drivers—wet basements or crawl spaces, efflorescence on masonry, and rotted or recently replaced trim near sills—then review grading, erosion, and pooling water. Repairs may run $5,000–$40,000.
Roof Problems That Fail a Home Inspection
When your inspector finds roof defects that compromise the water-shedding system, they’ll typically flag the condition as a major repair or a pre-closing replacement item. You’ll see this when shingles are missing, curled, cracked, or shedding granules, because gaps in the roof covering and popped nails let water bypass the underlayment. Widespread shingle failure from UV exposure, heat, wind, moisture, or age often triggers a recommendation for full replacement rather than spot repairs.
Inspectors also focus on flashing at chimneys, vent pipes, valleys, and wall joints, since it’s a primary failure point. If they document rusted metal, cracked sealant, or improperly installed step flashing (including a cracked vent-boot collar), they’ll call for licensed-roofer correction. You can also fail for soft decking: spongy areas and wood rot indicate structural deterioration. Heavy moss or debris-clogged gutters and misdirected downspouts get cited because they retain moisture and accelerate roof wear.
Plumbing Leaks and Water Damage Inspectors Cite
Roof defects often show up as visible water entry from above, but inspectors also trace moisture to plumbing leaks that soak walls, ceilings, cabinets, and subfloors. You’ll see yellow-brown staining that spreads, soft or swollen materials, and damp odors that suggest prolonged exposure and possible mold. You should also treat sudden water-bill spikes as a red flag; about 10% of U.S. homes leak, wasting roughly 90 gallons daily.
Inspectors focus on common sources first: leaky faucets, loose supply hoses, and running toilets that waste water over time. They’ll examine exposed piping under sinks and in basements for corrosion, active drips, and prior repairs, then verify pressure with a gauge; 40–60 psi is the target range. If pressure drops suddenly or you hear gurgling, you may have a hidden leak or flow restriction. Older polybutylene supply lines get flagged for failure risk and costly replacement. Additionally, understanding home systems is vital for effective long-term maintenance and prevention of issues.
Electrical Issues That Trigger Safety Repairs
Because electrical defects can overheat conductors or energize metal parts, inspectors treat them as immediate safety items rather than routine upgrades. If your home predates the 1960s, you may have knob-and-tube wiring without a grounding conductor or brittle insulation and taped/soldered splices; inspectors report it due to arcing and fire risk, and insurers may decline coverage. Aluminum branch wiring also triggers a deficiency because terminations can loosen and overheat, and replacement with copper is often recommended to meet current safety codes.
You’ll also see safety calls when circuits are overloaded or when multiple conductors are stuffed under one lug, both of which raise conductor temperature. Missing or nonfunctional GFCI receptacles in kitchens and baths violate wet-area protection requirements; you should see working “test” and “reset” buttons. Expect repairs for reversed polarity, exposed conductors, missing covers, ungrounded receptacles, and improper bonding/neutral isolation in subpanels.
Deal-Stoppers: HVAC, Pests, Radon, and Mold
Even if the rest of the report looks manageable, you should treat major HVAC failures, pest activity, elevated radon, and mold growth as potential deal-stoppers since they raise immediate safety, health, and cost-of-ownership risks. A broken furnace that warrants repair or replacement signals system failure; outdated heating equipment appears in 80%+ of inspections needing repair, and urgent HVAC defects often drive contract termination per NAR trends. You should also view pests as an environmental hazard: inspectors find evidence in hidden areas in 80%+ of homes, and termites or active infestations indicate structural risk, especially when poor DIY repairs create entry points. For radon, you should request testing, particularly in older properties; elevated results create a documented health hazard that can justify a walk-away or major concessions. For mold, treat visible growth or water-damage indicators as non-negotiable until you verify source control and remediation scope and clearance testing.
Frequently Asked Questions
Will My Home Inspection Report Affect the Final Purchase Price?
Yes—your home inspection report can affect the final purchase price because you can use documented defects to renegotiate. You’ll often request a credit, repairs, or a price reduction based on the inspector’s findings and estimates. Many buyers save around $14,000 on average, with major items like heating or roof defects driving larger concessions. If issues impact appraisal value, you may also need price adjustments to close.
Can I Attend the Inspection and Ask Questions in Real Time?
Yes—you can attend and ask questions in real time, and you’d be wildly unprepared not to. You’re typically permitted in standard scenarios, and you should observe conditions firsthand and learn system operation. Ask the inspector about defects, maintenance, and priorities, then take notes for negotiations. Bring your agent; some areas don’t allow unaccompanied buyers. Keep extra guests limited, and avoid seller attendance to prevent interference.
How Long Does a Typical Home Inspection Take to Complete?
A typical home inspection takes about 2–4 hours on-site, and you’ll usually receive the report within 24–48 hours (or 1–3 business days). For an 800–1,200 sq ft condo, expect 60–90 minutes; a 2,000–2,500 sq ft house runs 2.5–3 hours. Add roughly 30 minutes per extra 500 sq ft. Older, occupied, or hard-to-access homes take longer.
What’s the Difference Between an Inspection and an Appraisal?
An appraisal acts like a price compass, while an inspection works like a flashlight in the walls. You’ll use an appraisal to estimate fair market value using location, condition, and comparable sales; your lender typically orders it and you pay. You’ll hire an inspector to evaluate the home’s structure and systems, flag defects, and guide repairs. Appraisals affect loan approval; inspections drive renegotiation or exit.
Should I Order Specialized Inspections Beyond the General Inspection?
Yes—order specialized inspections when the home’s age, region, or the general report shows red flags. You’ll add mold testing for musty odors or stains ($300–$990), foundation evaluation for cracks/settling ($340–$720), radon in older or high-risk areas ($155–$700), asbestos in older builds ($230–$790), and termite/pest checks ($50–$280). You’ll pay separately, but you can negotiate repairs or price reductions.
