What Does a Home Inspection Look For?
What does a home inspection look for is a question buyers ask the moment a contract goes under contract. The framing matters: the inspection is a defined service process, not the personal judgment of a single inspector. Trade associations like ASHI and InterNACHI publish Standards of Practice that spell out exactly which systems get inspected and which are excluded. Most reputable inspectors follow one of these standards, which means the scope is far more predictable than buyers realize. This guide walks through the ten typical categories a residential home inspection covers, frames the inspection as a service process, and explains how each category protects the buyer from the most common large-ticket repairs.
What does a home inspection look for at the highest level?
A standard residential home inspection examines the major systems and visible components of a single-family home to identify defects, safety concerns, and items needing immediate repair or maintenance. The inspection is non-invasive (no destructive testing) and visual-only, which means the inspector does not open walls, remove finished surfaces, or test systems beyond their normal operational range. The scope is defined by trade-association standards rather than individual preference.
ASHI and InterNACHI both publish Standards of Practice that list the systems an inspector must examine and the components explicitly excluded. Most working inspectors on the Front Range follow one of these standards. That alignment is why two qualified inspectors examining the same home should produce reports that overlap heavily on the major findings. The hiring-process guide for Front Range buyers covers how to verify which standard a given inspector follows.
The ten typical inspection categories
A standard inspection covers roughly ten major scope categories. Each category has its own set of components, defect patterns, and safety concerns. Together they account for the bulk of large-ticket repair costs that a home buyer might face during the first five years of ownership.
1. Roof and roof components
The roof inspection covers the roofing material (asphalt shingle, tile, metal, membrane), flashing around penetrations, gutters and downspouts, soffit and fascia, and visible chimney components. Inspectors look for missing or curled shingles, hail damage (especially common across the Front Range), flashing separation, and gutter slope problems. Roof replacement is one of the highest-ticket repair items in residential ownership, so the roof category often drives early negotiation in a Colorado transaction.
2. Exterior siding and trim
The siding inspection looks at the wall cladding (wood, vinyl, stucco, fiber-cement, brick veneer), trim boards, caulking at joints, paint condition, and any visible damage. Wood-rot patterns at trim corners and behind downspouts are common findings. Stucco inspection is more involved because hairline cracks can indicate either normal settling or active water intrusion, and the inspector typically flags larger patterns for further evaluation by a stucco specialist.
3. Foundation and structure
The structural inspection covers the visible foundation walls, footings (where accessible), structural framing, load-bearing walls, and any visible signs of movement. Cracks in foundation walls are classified by width, direction, and pattern. Hairline vertical cracks are usually settling and require monitoring. Horizontal cracks, stair-step cracks in masonry, and cracks wider than 1/4 inch can indicate active structural movement requiring an engineer’s evaluation.
4. Electrical system
The electrical inspection covers the service entrance, main panel, sub-panels, visible wiring, outlets, switches, and lighting fixtures. The inspector documents the panel amperage (typically 100, 150, or 200 amps in residential applications), checks for double-tapped breakers, missing knockouts, missing GFCI protection in wet areas, and aluminum or knob-and-tube wiring in older homes. Older Front Range homes (pre-1972) sometimes show federal-Pacific or Zinsco panel issues that warrant a licensed-electrician review.
5. Plumbing system
The plumbing inspection covers visible supply lines, drain lines, water heater, fixtures, and exposed shut-off valves. Inspectors test water pressure at multiple fixtures, look for active leaks under sinks, check water heater age and condition (typical lifespan 8 to 15 years), and document any galvanized supply lines or polybutylene piping. Polybutylene piping (gray plastic supply lines from the 1980s and 1990s) is a known failure pattern and almost always becomes a negotiation item.
6. HVAC system
The heating and cooling inspection covers the furnace or boiler, air conditioner condenser, ductwork, thermostat, and visible refrigerant lines. Inspectors note equipment age (most furnaces last 15 to 25 years, AC condensers 10 to 18 years), test for normal operation, and document any visible condition issues. Inspectors do not perform combustion-analysis testing or refrigerant-pressure testing, which require specialty equipment and licensing.
7. Insulation and ventilation
The insulation inspection examines attic insulation depth and type (fiberglass batt, cellulose, spray foam), wall insulation where visible, and ventilation pathways. Inspectors document attic R-values where measurable and flag inadequate ventilation that can drive moisture buildup or ice damming. Front Range homes with original 1970s insulation often have R-19 attic insulation against a modern energy-code recommendation of R-49 or higher.
8. Interior rooms
The interior inspection covers walls, ceilings, floors, windows, doors, and built-in appliances. Inspectors document cosmetic damage, settlement cracks, window operation, door alignment, and any visible water-staining patterns. Built-in appliances are tested for basic operation but not exhaustively (the inspector does not run a full dishwasher cycle or test every oven element).
9. Attic and crawlspace
The attic and crawlspace inspection looks at structural framing, insulation, ventilation, moisture indicators, and any signs of pest activity. Inspectors enter the attic and crawlspace where safe and accessible. Limited access is documented in the report. Crawlspace issues common on the Front Range include moisture buildup, vapor barrier failure, and visible plumbing damage that is not visible from the living space above.
10. Garage and detached structures
The garage inspection covers the garage door operation, auto-reverse safety functions, fire-separation wall between garage and living space, and any electrical or plumbing components in the garage. Detached structures are inspected when included in the scope and when safely accessible. The fire-separation requirement (typically a 5/8-inch Type X drywall on the garage-to-living-space wall) is a common finding when homeowners have replaced drywall without restoring the rated assembly.
What a home inspection does NOT look for
The scope exclusions matter as much as the inclusions. A standard inspection does not include destructive testing, sampling for hazardous materials, code compliance verification, or pest-control identification beyond visible signs. Specific exclusions almost always include:
- Lead-paint testing (requires EPA-certified lead-paint inspector)
- Asbestos testing (requires accredited laboratory and certified sampler)
- Radon testing (separate ancillary service, often by the same inspector)
- Mold air sampling (separate ancillary or specialty service)
- Termite or wood-destroying organism identification (often a separate WDO inspector)
- Sewer-scope line inspection (separate ancillary)
- Swimming pool and spa equipment (separate specialty inspection)
Buyers in pre-1978 homes should specifically arrange for lead-paint and asbestos screening alongside the standard inspection because those hazards are explicitly excluded from a normal home inspection’s scope.
How the home inspection service process flows
The inspection itself is just one step in a structured service process. A typical Front Range inspection follows this sequence:
- Buyer schedules inspection within the inspection-objection deadline in the purchase contract
- Inspector confirms scope, ancillaries, and access requirements
- On-site inspection takes 2 to 3 hours for a typical 2,500-square-foot home
- Buyer is encouraged to attend the final 30 minutes for a walkthrough summary
- Written report delivered within 24 to 48 hours, typically 40 to 80 pages with photos
- Buyer reviews report, prioritizes findings, and discusses with real-estate agent
- Inspector available for follow-up questions throughout the inspection-objection window
That service process is the difference between an inspection that is “just a checklist” and an inspection that meaningfully protects the buyer through the closing process. Looking at what an inspector personally looks for covers the same ground from the inspector-as-person perspective rather than the service-process perspective.
How buyers should use the report findings
The inspection report typically classifies findings into safety concerns, items needing repair, items needing further evaluation by a specialist, and general maintenance items. Buyers should focus negotiation energy on the safety and immediate-repair categories rather than the maintenance items. Cosmetic findings and standard wear-and-tear items are rarely productive negotiation points and can damage the buyer’s standing with the seller during a tight transaction.
A practical prioritization habit is to mark the report’s top three to five items by repair cost. Items costing $1,000 or more often justify either a price reduction, a seller credit at closing, or a request for the seller to complete the repair prior to closing. Items below $500 typically belong on the buyer’s first-year maintenance list rather than the negotiation table. The buyer’s agent usually has strong opinions on which items will resonate with the listing agent and which will be dismissed, so most successful inspection-objection responses are shaped by that local-market knowledge as much as by the report itself.
Why the service-process framing matters
Treating the home inspection as a defined service process rather than a single inspector’s personal judgment changes how a buyer reads the report. The process framing puts the focus on the scope categories that should be covered, the standards of practice that govern the work, and the deliverables (written report, walkthrough summary, follow-up availability) the buyer should expect. That framing turns vague impressions into a checklist a buyer can use during the inspection-objection window. A buyer who notices an entire scope category is missing from the report can ask the inspector to clarify before the deadline passes.
The service-process framing also helps buyers compare inspectors fairly. Two inspectors who follow the same Standard of Practice and run the same defined process should produce similar reports for the same home. Differences usually trace to the depth of narrative writing, the number and quality of photos, the use of infrared or moisture-meter tools, and the inspector’s willingness to spend extra time on the buyer’s walkthrough. Treating those differences as service-level variables rather than personality traits makes the hire decision clearer.
How specialist follow-ups fit into the process
Many inspection reports recommend a follow-up evaluation by a licensed specialist for specific findings. A foundation crack with horizontal displacement warrants a structural engineer’s review. An older electrical panel of a brand known for failure patterns warrants a licensed-electrician inspection. A water-staining pattern on the ceiling under a bathroom warrants a plumber’s investigation before closing. The home inspector is the generalist who flags the issue; the specialist is the licensed professional who diagnoses the cause and quotes the repair.
Buyers who treat the home inspection as the final word miss the next layer of due diligence. A 60-page inspection report with five recommended specialist follow-ups is not a failure of the inspector to render judgment. It is the inspector doing exactly the job the Standards of Practice define: identifying concerns and routing the buyer to the right specialist when a finding exceeds the generalist scope. Budgeting time and dollars for two or three follow-up evaluations during the inspection-objection window is a normal part of a thorough closing process.
References
- ASHI Standards of Practice — residential scope — American Society of Home Inspectors
- InterNACHI Residential Standards of Practice — InterNACHI
- ICC residential inspection professional development — International Code Council