What Do Home Inspectors Do? A Plain-Language Guide
Home inspectors evaluate the condition of a property and tell the buyer what they found. That sounds simple, but the role carries specific boundaries that surprise many first-time buyers. A home inspector is not an appraiser, not a code official, and not a repair contractor. They perform a visual, non-invasive examination of a home’s readily accessible systems and produce a written report documenting defects and safety concerns. Knowing exactly what do home inspectors do — and what falls outside their job — helps buyers set realistic expectations, ask sharper questions, and use the report effectively during negotiations. This guide walks through the inspector’s tasks, limits, and the deliverable that defines the service.
The standards that define the job
A home inspector’s work is not improvised; it follows a written standard of practice that spells out what must be examined and what may be excluded. This framework is what makes inspections consistent from one professional to the next and what protects both parties from misunderstanding.
The standards published by ASHI and InterNACHI describe the systems an inspector must evaluate, the methods used, and the explicit limitations of the inspection. They establish, for instance, that the inspection is visual and non-invasive, that the inspector reports on readily accessible components, and that certain things — like operating shut-off valves or dismantling equipment — fall outside the scope. They also include a code of ethics prohibiting conflicts of interest, such as performing the repairs the inspector recommends.
For a buyer, the practical value of these standards is predictability. Hiring a certified inspector means hiring someone bound to a known scope and ethical framework, rather than relying on an individual’s discretion about what to check. It is also why certification matters so much in a state like Colorado that does not license inspectors — the standard, not the state, defines the job.
What a home inspector does, in plain terms
A home inspector conducts a systematic, visual walk-through of a property, operating systems normally and documenting their condition. They check the roof, exterior, structure, attic, plumbing, electrical, heating and cooling, interior, and built-in appliances, then deliver a report that lists defects, rates their severity, and recommends next steps.
The work is governed by a standard of practice published by associations like ASHI and InterNACHI. That standard defines the scope precisely, which protects both the buyer (who knows what to expect) and the inspector (who is not liable for things outside the agreed scope). For the wider context of when and why buyers engage one, the guide to hiring a home inspector covers the full process.
The systems an inspector examines
A typical inspection takes two to four hours and follows a consistent checklist. Here is what the inspector evaluates.
Roof and exterior
The inspector assesses the roof covering, flashing, gutters, and penetrations, along with siding, trim, windows, grading, and drainage. On the Front Range, hail damage and poor drainage into expansive clay soils are recurring findings.
Structure and foundation
Visible framing, foundation walls, and signs of movement get close attention. The inspector documents cracks, settlement, and moisture intrusion but refers active or severe movement to a structural engineer for load-bearing analysis.
Plumbing, electrical, and HVAC
The inspector runs water to check pressure and drainage, notes the water heater’s age and condition, opens the electrical panel to look for hazards, and cycles the furnace and air conditioner. Safety issues — missing ground-fault protection, improper venting, double-tapped breakers — are flagged as priorities.
Interior and appliances
Walls, ceilings, floors, stairs, railings, doors, and built-in appliances are checked for function and safety, with particular attention to water-staining patterns that hint at hidden leaks.
What home inspectors do not do
The limits are as important as the scope, because misunderstanding them is the main source of buyer disappointment.
- They do not open walls or move belongings. The inspection is non-invasive and limited to what is readily accessible. A defect hidden behind drywall or stored boxes falls outside the scope.
- They do not appraise value. Market value is the appraiser’s job, ordered by the lender. The inspector evaluates condition only.
- They do not certify code compliance. Inspectors evaluate against standards of practice, not current building code. Code enforcement belongs to local officials.
- They do not guarantee future performance. A working furnace on inspection day can fail later. Inspectors estimate remaining life but do not warranty it.
- They do not perform lab testing on the spot. Suspected lead paint, asbestos, mold, or radon are referred for specialized testing rather than confirmed visually.
That last point matters in older homes. An inspector will flag materials that may contain lead or asbestos, but confirming them requires the lab work outlined in the asbestos and lead guide. Similarly, radon requires a measurement device, not a visual check.
Specialty referrals: where the inspector hands off
A general inspector is broad but not deep. When a finding exceeds their scope, the professional move is to recommend a specialist. Common referrals include radon testing, a sewer-line camera scope, a structural engineer, an HVAC technician for a suspect heat exchanger, or a roofer for a damaged covering.
Radon referral is near-universal on the Front Range. Colorado’s geology produces high indoor radon, and the radon testing overview explains why a measurement belongs in nearly every inspection here. Many inspectors offer radon testing as an add-on so the referral happens during the same visit. Treating these referrals as a normal part of the process — not a sign the inspector fell short — leads to a more complete condition picture.
What home inspectors look for in each major system
Within the broad checklist, inspectors hunt for specific failure patterns. Knowing the targets helps buyers understand the depth behind a finding.
Roof
Missing, curled, or hail-bruised shingles; failed or absent flashing at penetrations and valleys; deteriorated sealant; and signs of prior repairs that may mask underlying problems. The inspector estimates remaining roof life, a major cost driver.
Electrical
An overloaded or improperly wired panel, double-tapped breakers, missing ground-fault and arc-fault protection, aluminum branch wiring, and reversed polarity at outlets. Electrical findings are weighted heavily because they are fire and shock hazards.
Plumbing
Low water pressure, slow drains, leaks under fixtures, an aging or improperly vented water heater, and outdated supply materials like galvanized or polybutylene piping that are prone to failure.
HVAC
A furnace or air conditioner near the end of its service life, a cracked heat exchanger, improper venting on high-efficiency units, and dirty or undersized systems. The inspector cycles the equipment to confirm it responds to the thermostat.
Structure and moisture
Foundation cracks and movement, water staining, efflorescence, and grading that directs water toward the home. On the Front Range, expansive soils make these especially common, and the inspector distinguishes cosmetic settling from active movement that warrants an engineer.
The report: the inspector’s real product
Everything the inspector does culminates in the report, typically delivered within 24 to 48 hours. A strong report runs 30 to 60 pages, includes a labeled photo for every significant finding, and sorts defects into safety hazards, major repairs, and minor or cosmetic items.
The report is what buyers actually use. It supports repair requests, price negotiations, and credit demands during the inspection objection period, and it doubles as a maintenance roadmap after closing. Because the report is the deliverable, evaluating an inspector means evaluating their reporting — which is why the guide to the best home inspectors emphasizes reviewing a sample report before booking.
What a home inspector does for the buyer’s decision
Step back and the inspector’s job is to convert uncertainty into documented fact. Before the inspection, the buyer is relying on a few showings and the seller’s disclosure. After it, they hold an independent assessment of the home’s condition, with the major systems’ ages, the safety hazards, and the looming repairs laid out in writing.
That conversion is the entire value. It lets buyers proceed with confidence, renegotiate with evidence, or walk away from a money pit before they own it. The inspector does not make the decision — they give the buyer the facts to make it well. For buyers weighing why the step matters at all, the importance of home inspections lays out the risk-and-leverage case in full.
A walk through the inspector’s day
Seeing the inspection as a sequence makes the inspector’s role concrete. A typical house call unfolds in a predictable order, though inspectors vary their routine.
The inspector usually starts outside, walking the perimeter to assess grading, drainage, siding, windows, and the foundation from the exterior. They evaluate the roof — from a ladder, on the surface, or with binoculars or a drone when the pitch or height makes walking unsafe. Inside, they move systematically through the home: testing a representative sample of outlets and switches, running faucets and flushing toilets to check pressure and drainage, cycling the furnace and air conditioner, and examining walls, ceilings, and floors for staining and damage.
The attic and crawlspace come next, where the inspector checks insulation depth, ventilation, visible framing, and signs of moisture or pest activity. Throughout, they photograph defects and take notes that become the report. The buyer who attends sees this process firsthand and can ask why a particular finding matters — turning a static document into a guided education about the home.
How an inspection differs from an appraisal and a code inspection
Three visits get confused because all involve a professional evaluating a property, but each serves a different master and answers a different question.
- Home inspection. Ordered by the buyer, it evaluates condition against standards of practice and reports defects. It offers no opinion on value or code compliance.
- Appraisal. Ordered by the lender, it estimates market value to protect the loan. An appraiser may note glaring safety issues on government-backed loans but does not test systems or crawl the attic.
- Municipal code inspection. Conducted by a local official, usually tied to permitted work or new construction, it verifies compliance with current building code at specific milestones — not overall condition.
A buyer who assumes the appraisal “checked the house” or that a passed code inspection means defect-free is mistaken on both counts. The home inspection is the only one of the three commissioned by and for the buyer to assess overall condition, which is exactly why it carries the weight it does in the transaction.
How to get the most from your inspector
Attend the inspection. Walking the property alongside the inspector turns a static report into a guided tour, and you will retain far more by seeing defects in person. Ask about system ages, maintenance priorities, and anything the seller’s disclosure flagged.
Match scope to the home: add radon, a sewer scope, and lead or asbestos screening for older properties. Read the full report rather than just the summary, and act on specialist referrals before closing, when you still have negotiating leverage. Used well, the inspector becomes the buyer’s most valuable advisor in the entire transaction.
References
- Residential Standards of Practice — InterNACHI
- Standard of Practice — American Society of Home Inspectors
- Codes and Standards Resources — International Code Council