Home Inspection Tips: Pro Advice From 11 Years in the Field

After 2,750+ home inspections, patterns emerge. Certain defects show up again and again — and certain things get missed by buyers who don't know what to watch for. This article shares the field-tested insights that separate a good inspection from a great one.

Whether you're a buyer trying to understand the process, or an inspector looking to sharpen your craft, these tips are drawn directly from real inspections across all property types and ages.

1. GFCI Outlets — The $15 Life-Saver Inspectors Always Check

GFCI (Ground Fault Circuit Interrupter) outlets are required by modern building codes in kitchens, bathrooms, garages, basements, and any area within 6 feet of a water source. They detect tiny imbalances in electrical current and shut off power in milliseconds — preventing electrocution.

What inspectors look for:

• Missing GFCI protection in required locations (kitchen countertops, bathroom outlets, garage, exterior)
• GFCI outlets that trip and won't reset (sign of a wiring fault)
• Outlets that are GFCI-protected "downstream" from a single GFCI device but aren't labeled
• Two-prong outlets that were converted to three-prong without grounding

Cost to fix: A single GFCI outlet costs $15–$20 at any hardware store and takes 20 minutes to swap out. Replacing multiple outlets in a kitchen or bathroom typically runs $150–$300 with an electrician.

Buyer tip: During your walkthrough before closing, test every GFCI outlet. Press the TEST button — it should cut power. Press RESET — power should return. Any that don't respond need immediate attention.

2. Water Heater Red Flags Every Buyer Should Know

Water heaters are one of the most commonly flagged items on inspection reports — and one of the most misunderstood. Here's what inspectors evaluate:

Age

The average conventional tank water heater lasts 8–12 years. The serial number contains the manufacture date — most brands use the first letter (A=January, B=February... L=December) and the next two digits for the year. A heater entering its tenth year is living on borrowed time.

Temperature & Pressure Relief (T&P) Valve

This is a critical safety device. If the water heater overheats or over-pressurizes, the T&P valve opens to release pressure and prevent an explosion. The discharge pipe must run to within 6 inches of the floor or exit the structure — never terminate pointing upward where someone could be scalded.

Location Considerations

Water heaters in garages must be elevated 18 inches off the ground (or have an ignition source protection device) to prevent ignition of flammable vapors. Heaters in bedrooms or closets adjacent to living spaces require sealed combustion or proper venting.

Cost to replace: A standard 40-gallon gas water heater installed runs $800–$1,500. Tankless units run $1,500–$3,500 installed. Knowing the age and condition before buying can be a real negotiating lever.

3. Drip Edge & Roofing Details That Inspectors Don't Skip

Drip edge is a metal flashing installed along the edges of a roof. Its job is to direct water off the edge and into the gutters, away from the fascia board and soffit. It's a $200 item that prevents thousands in rot damage — and it's missing on a surprising number of homes.

What inspectors check along the roofline:

• Drip edge presence and condition — missing drip edge on rakes (sloped edges) is extremely common on older homes
• Fascia board condition — rot at the ends is often caused by missing drip edge
• Shingle overhang — shingles should overhang the edge by 1–1.5 inches; too little lets water wick back under
• Flashing at roof-to-wall transitions — step flashing, counter flashing, and kick-out flashing prevent water intrusion at the most vulnerable points
• Valley flashing — woven shingles vs. open metal valleys have different vulnerability profiles
• Chimney flashing — one of the most common leak sources on any roof

4. Gutters & Drainage — Often Overlooked, Always Important

More foundation damage starts at the gutters than most people realize. Gutters that overflow, disconnect, or drain too close to the foundation funnel water directly to where it can cause the most harm.

What inspectors evaluate:

• Slope — gutters should slope toward downspouts at roughly 1/4 inch per 10 feet
• Separation — gutters pulling away from the fascia create a gap that sends water behind the gutter
• Downspout extensions — water should discharge at least 6 feet from the foundation (ideally 10 feet)
• Missing downspouts — a gutter that drains at the corner with no downspout dumps water at a corner foundation
• Standing water in gutters — indicates improper slope; standing water causes early rust and mosquito breeding
• Splash blocks — should be present under every downspout and sloped away from the structure

5. Seasonal Home Inspection Tips

What an inspector emphasizes shifts with the season. Here's what to pay extra attention to based on when your inspection takes place:

Winter Inspections

• Snow covering the roof means limited visibility — a credit or re-inspection is reasonable to request
• Verify the heating system is fully operational and all registers deliver warm air
• Look for signs of ice damming (staining on interior walls, damaged soffits, missing shingles at eaves)
• Check for frost or condensation on windows indicating seal failure
• Frozen ground can hide grading and drainage issues — expect a limitation note in the report

Spring & Fall Inspections

• Best time to assess roof drainage — look for water staining in attic after recent rain
• Check basement for any moisture intrusion after spring thaw
• HVAC transition time — both heating and cooling can be tested in shoulder months
• Tree proximity: overhanging branches, root intrusion near foundation

Summer Inspections

• Air conditioning performance is fully testable — most important time to ensure proper operation
• Check attic temperatures — poorly ventilated attics can reach 150°F+ and dramatically shorten shingle life
• Look for evidence of wood-destroying pests (termite mud tubes, carpenter ant frass)
• Irrigation systems and exterior spigots can be fully tested

6. 10 Quick-Win Tips That Pro Inspectors Use

1. Run every faucet simultaneously to test water pressure under load. Low pressure suggests galvanized piping, partially closed shut-offs, or a failing pressure regulator.
2. Check the attic hatch for insulation and air sealing. A poorly sealed hatch loses heat equivalent to leaving a window open all winter.
3. Test garage door auto-reverse by placing a 2x4 flat on the ground. The door must reverse on contact — a failed auto-reverse is a child safety hazard.
4. Look at the circuit panel breakers for double-tapped breakers (two wires under one breaker terminal) — common and a fire risk.
5. Flush every toilet and watch the bowl. A toilet that "runs" after the flap closes is wasting $100–$200/year in water. One that doesn't fill completely has a fill valve issue.
6. Test the smoke and CO detectors. Smoke detectors more than 10 years old should be replaced; CO detectors more than 7 years old should be replaced.
7. Check window operation in every room — stuck windows are a fire egress issue in bedrooms. Look for broken sash locks, failed glazing, and painted-shut frames.
8. Look at the water stain record in the basement. Efflorescence (white mineral deposits) on the walls indicates past water intrusion. Fresh staining means active or recent.
9. Check the age of all major appliances — HVAC, water heater, dishwasher. The serial numbers tell you the manufacture date. Knowing what's near end-of-life helps budget for replacements.
10. Note the ceiling fan direction. Fans should rotate counterclockwise in summer (push cool air down) and clockwise in winter (pull warm air from the ceiling). Simple to change, often overlooked.

7. Tips for Buyers on Inspection Day

Attending the inspection is one of the best investments of time you'll make during the home-buying process. Here's how to get the most out of it:

• Show up for the last 30–45 minutes — don't shadow the inspector the whole time. Let them work. Join for the summary walkthrough where they explain findings in person.
• Bring a notepad and take notes. The written report comes later; your hand-written notes help you remember which specific window or outlet they were pointing to.
• Ask about the difference between safety issues and maintenance items. Not all defects are equal. An inspector's job is to find everything; your job is to prioritize with your agent.
• Don't panic at a long report. A 60-item inspection report on a 1970s home is normal. A 3-item report on any home should raise questions — either the inspector was thorough and found little, or they weren't thorough.
• Ask about life expectancy. "How old is this roof?" and "How many years does it likely have left?" are perfectly reasonable questions for your inspector to address.
• Get the utility bills if possible. An older HVAC system in a poorly insulated home might work fine but cost $300/month in winter. That's not in the inspection report but it's a real cost.