House Inspection Questions to Ask Your Inspector (And the Seller)

Most first-time buyers show up to a home inspection and watch. The inspector crawls through the attic, probes the electrical panel, runs every faucet, and two hours later presents a lengthy report. At some point someone asks "Is it a good house?" and the inspector gives a careful answer that does not quite answer the question.

The truth is, the inspection is most valuable when you are an active participant — asking the right questions at the right moments, and following up with the seller on things the inspector cannot answer. This guide gives you a complete list of questions to ask your inspector during the walkthrough, additional questions to raise after you receive the report, and the questions you should be asking the seller before and after the inspection.

Before the Inspection Starts: Questions for Your Inspector

The few minutes before the inspector begins working are a good time to calibrate expectations.

"How long have you been inspecting homes, and what is your background?" The most valuable inspectors typically have backgrounds in construction, contracting, or building trades — not just inspection certification. An inspector who spent 15 years as a master electrician before becoming an inspector brings insight to the electrical panel that no certification alone can replicate.

"Are you a member of ASHI or InterNACHI, and can you walk me through your report format?" ASHI (American Society of Home Inspectors) and InterNACHI (International Association of Certified Home Inspectors) are the two major US certification bodies. Both have rigorous standards. Knowing which your inspector belongs to helps you understand the lens they use. Ask them to briefly explain how they categorize severity in their report — different inspectors use different terminology.

"What tools and technology are you using today?" A visual inspection is the baseline. Many experienced inspectors also use moisture meters (to detect hidden water damage behind drywall), outlet testers, gas detectors, and infrared cameras (thermal imaging). Thermal imaging in particular can reveal missing insulation, active moisture behind walls, and overloaded circuits — all invisible to the naked eye. If the inspector uses thermal imaging, ask them to explain any notable thermal anomalies on the spot.

"Can I follow you through the inspection?" The answer should be yes. If an inspector objects to your presence during the inspection, find a different inspector. Shadowing the walkthrough gives you context that a written report cannot — you see the crack firsthand, you understand the inspector's tone when they describe it, and you can ask follow-up questions in the moment.

During the Inspection: Room-by-Room Questions

As you follow the inspector, here are the highest-value questions to ask at each stage. You do not need to ask all of them — focus on the areas that appear problematic or where you have specific concerns.

Roof and Attic

"How old do you estimate the roof is, and how much useful life is left?" The inspector will look at the type of shingles, the degree of granular loss, and any visible curling or cracking. A direct estimate — "I'd say 5-8 years left" vs. "This is at end of life now" — tells you whether to budget for a roof in two years or request a credit today.

"Is there adequate ventilation in the attic, and what does that affect?" Poor attic ventilation is one of the most consequential problems inspectors find, and it is also one of the most misunderstood. Inadequate ventilation causes heat and moisture to accumulate. In hot climates, it dramatically reduces the life of asphalt shingles. In cold climates, it causes ice dams. In all climates, it creates conditions for mold in the sheathing.

"Do you see any evidence of past roof leaks?" The inspector will look at the sheathing boards in the attic for staining, dark discoloration, and rusted roofing nails. Past leaks that have since been repaired may still leave evidence in the attic. This tells you whether the active roof is the only story, or whether there was a historic problem.

Foundation and Basement

"What type of foundation does this home have, and what are the specific concerns for that type?" Poured concrete, concrete block, stone rubble — each has its own failure modes. Block foundations develop stair-step cracks that follow mortar joints and can indicate settlement. Poured concrete develops vertical shrinkage cracks (usually benign) or horizontal cracks from soil pressure (more serious). Stone foundations in older homes are permeable by nature and nearly always show some moisture.

"Are these cracks structural or cosmetic?" When the inspector points at a crack in the foundation, ask this directly. Vertical and diagonal hairline cracks from concrete shrinkage are usually cosmetic. Horizontal cracks, cracks wider than 1/4 inch, or cracks with visible displacement — where one side of the crack is higher than the other — are more concerning. If the inspector uses the phrase "further evaluation," ask them to explain what specifically they are worried about before you leave the basement.

"Is there any evidence of past water intrusion?" Look for white chalky deposits on the walls (efflorescence, caused by water moving through the wall and depositing minerals), tide lines or staining, or patches of sealant that suggest someone tried to address a leak. Ask the inspector to interpret what they see.

Electrical

"What is the service size, and is it adequate for this home?" Modern homes need at least 100-amp service; 200 amps is standard for homes built in the last 30 years and is necessary for EV charging or significant electrical loads. A 60-amp service in an older home is undersized.

"Is there anything about the electrical panel I should be concerned about?" This question opens the door for the inspector to explain any panel brand concerns (Federal Pacific Stab-Lok, Zinsco), any double-tapping they observed, or any service entrance cable issues.

"What type of wiring is in this home?" The three wiring types that matter are: copper (standard, no concerns), aluminum branch circuit wiring from the 1960s-70s (fire hazard at connections — requires a fix called "pig-tailing" or full rewiring), and knob-and-tube (pre-1950, no ground wire — often uninsurable).

Plumbing

"What type of supply pipes does this home have?" This question gets at whether you have copper (standard, long-lived), CPVC or PEX (modern plastic, generally fine), polybutylene (1978-1995 vintage, prone to failure and often uninsurable), or galvanized steel (pre-1960s, corroding from the inside out and nearing end of life).

"Should I get a sewer scope inspection?" Ask this directly, especially on homes over 30-40 years old. A sewer scope sends a camera down the lateral sewer line (the underground pipe that connects the house to the municipal sewer or septic system). Root intrusion, collapsed sections, or failing Orangeburg pipe (a tar-based material used through the 1970s) are common findings. A sewer scope costs $250-$500. A collapsed sewer repair costs $5,000-$25,000.

"What is the age and condition of the water heater?" Water heaters typically last 8-12 years. If it is over 12 years old, budget for replacement regardless of current operation. Ask if the TPR valve has a discharge pipe (a safety requirement in all jurisdictions) and whether the unit shows any signs of rust or corrosion at the base.

HVAC

"How old are the heating and cooling systems, and what should I expect in terms of remaining life?" Gas furnaces typically last 15-20 years. Central air conditioning units and heat pumps typically last 10-15 years. Knowing the age against these benchmarks tells you what you should be budgeting in the next 5 years.

"Is the heat exchanger accessible, and did you see anything concerning?" In gas or oil furnaces, a cracked heat exchanger allows combustion gases (including carbon monoxide) to enter the living space. It is a life-safety issue requiring full furnace replacement. Some heat exchangers are accessible for visual inspection; many are not. If the inspector says it is not accessible, ask whether they recommend a specialist HVAC evaluation.

"What does the filter condition tell you about how this system has been maintained?" This is both practical and diagnostic. A severely clogged filter indicates the HVAC system has been neglected. An inspector who has been in thousands of homes can tell you whether the maintenance history suggested by the filter matches the overall condition of the house.

Exterior

"Does the grading around the house direct water away from the foundation?" Negative grade (ground sloping toward the house) is one of the most common exterior issues and one of the easiest to address — but only if you know it is there. The inspector will note whether the grade is adequate or whether there is evidence of water pooling near the foundation.

"Are there any concerns about the deck or porch structure?" Decks are one of the most frequently improperly built exterior features. Questions of concern: ledger board attachment to the house (this is the primary failure point in deck collapses), post-to-beam connections, guard rail height and spacing, and any signs of rot at the base of posts.

After You Receive the Report: Follow-Up Questions for Your Inspector

Once you have read the full report, call or email your inspector with any remaining questions. Specifically ask:

"Which items in this report are you most concerned about?" Let them prioritize. Inspectors write calibrated reports, but they sometimes bury the lead in careful language. A direct question about their biggest concerns often yields a more candid answer than the report itself.

"For the items flagged as 'further evaluation required,' can you give me any sense of the range of possible outcomes?" They cannot predict cost, but they can often give you a sense of best case vs. worst case. "Best case it's a $2,000 waterproofing job; worst case if the foundation wall needs rebuilding, you're looking at $20,000+" is useful even as a rough range.

"Is there anything about this home that you would want to know if you were buying it?" This is a permission-giving question. Some inspectors will answer honestly and usefully. Others will stay safely within the boundaries of the report. Either way, asking communicates that you want their full perspective.

Questions to Ask the Seller After the Inspection

Your real estate agent can relay these to the seller's agent, or they can be posed in writing as part of your repair request process.

• Have there been any past insurance claims on this property? (Particularly relevant for water damage, fire, or structural claims.)
• Is there a history of basement flooding or water intrusion?
• Have any renovations or additions been done, and if so, were permits pulled?
• When was the roof last replaced?
• Is there a service history for the HVAC system?
• Are there any known issues with the property that have not been disclosed?

In most US states, sellers have a legal disclosure obligation to reveal known material defects. Asking these questions creates a paper trail — if they deny knowledge of an issue that later turns out to be pre-existing and documented, that has legal implications.

The Checklist That Matches These Questions

If you want to walk into your inspection fully prepared — knowing which systems to prioritize, which rooms to focus on, and what to look for in each — our Home Inspection Checklist organizes all of this systematically. It is built to be used alongside your professional inspector, not instead of one. Get it at firsthometoolkit.com/home-inspection-checklist/ before your inspection day.

The difference between a buyer who asks the right questions and one who silently follows the inspector is often a difference of thousands of dollars at the negotiating table — and the confidence that comes from truly understanding what you are buying.