Residential Home Inspection Checklist: Property-Type Scope Guide

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The phrase residential home inspection checklist gets used as if all residential buildings share a single inspection scope. They do not. A single-family detached house, an attached townhouse, a condominium unit, and a duplex each present different walls, different roof assemblies, different shared systems, and different boundaries between owner responsibility and association responsibility. The checklist that works for a 1980s ranch on a quarter-acre lot does not transfer cleanly to a fifth-floor condo unit. This guide walks through how property type changes the residential inspection scope and which line items move on, off, or sideways as the building configuration changes.

Why “Residential” Is Not One Inspection

“Residential” is a regulatory and zoning category that covers anything intended for personal dwelling use up to roughly four units. Beyond four units, most jurisdictions treat the property as commercial multifamily, with a different code chapter and a different inspection scope. Within the residential category, however, sub-types diverge sharply. The ASHI Standard of Practice and InterNACHI Standards both define a baseline of systems to inspect: structure, exterior, roof, plumbing, electrical, HVAC, interior, insulation, fireplace. The standards apply to all residential property, but how each system is accessed and what counts as “the property” varies.

For the underlying format every inspector follows, our home inspector checklist breakdown covers the field-tool perspective. The property-type adjustments layer on top.

Single-Family Detached: The Default Case

A single-family detached house is the default case the standards were written around. The inspection covers everything from the property line to the chimney cap. The owner is responsible for everything visible. Scope includes the lot grading, exterior siding and trim, full roof assembly from rafters to shingles, foundation walls, all interior partitions, complete plumbing from meter to fixtures, complete electrical from panel to outlets, HVAC equipment and ductwork, attached garage, deck and porch, and detached outbuildings if included in the sale.

Inspection time runs three to four hours for a typical thirty-five-hundred-square-foot home. Defects can appear in any system, and the inspector has full access to inspect each one. The report covers the full property without scope carve-outs.

Townhouse: Shared Walls Complicate Scope

A townhouse is a single-family-style unit attached to one or more neighboring units by shared walls. Ownership typically extends from the exterior wall in, plus a portion of the roof above and the foundation below. The yard and exterior surfaces may be owned individually or by the homeowners association. Scope adjusts to reflect that.

The inspector covers everything inside the unit at single-family depth: plumbing, electrical, HVAC, interior, attic if accessible. Exterior scope depends on the HOA documents. If the unit owns its own roof section, the inspector inspects that section. If the HOA owns the roof, the inspector typically notes condition from the ground but does not climb the roof or assess maintenance responsibility. Shared party walls are inspected at the unit side only. The inspector cannot enter the neighboring unit to look at the other face of the shared wall.

Townhouse buyers should obtain the HOA’s reserve study and recent inspection records separately. Those documents reveal upcoming assessments for shared-component replacement that an inspector cannot otherwise observe.

Condominium: The Walls-In Inspection

A condominium unit is the most scope-restricted residential inspection. The unit owner typically owns from the interior surfaces of the walls in. The HOA owns the structure, the roof, the building exterior, common areas, and often plumbing and electrical lines outside the unit walls. The inspection scope follows that ownership line.

A typical condo inspection covers: interior walls, ceilings, and floors visible to the unit; plumbing fixtures and visible supply or drain lines within the unit; electrical outlets, switches, and the unit panel if there is one; HVAC equipment located in the unit and the visible ductwork; appliances; windows and patio doors as they appear from inside; and the unit-side of entry doors. The inspector may walk the common areas and note general condition observations as a courtesy, but those areas are not part of the inspection liability.

Inspection time for a typical thousand-square-foot condo runs an hour and a half to two hours. The fee runs lower than a single-family inspection because the scope is narrower. Buyers should pair the inspection with a careful review of HOA financials and master insurance policy. The narrower scope is also why our comprehensive home inspection guide distinguishes between full and limited inspection scopes.

Duplex, Triplex, and Fourplex: Multi-Unit Within Residential

Small multi-family properties up to four units typically count as residential under the standards. The inspection covers each unit individually plus all shared systems. Time scales accordingly: a duplex inspection runs four to five hours; a fourplex can run six to eight.

Scope additions over a single-family include: separate utility services if metered individually; shared plumbing stacks and vents; common-area electrical panels and metering; fire-separation walls between units required by code; common stairs, hallways, and entries; and shared mechanical rooms. The inspector documents condition of each system separately for each unit.

Buyers should expect a longer report and a higher inspection fee. The investment-grade scope often adds rent-roll documentation review, lease analysis, and operating expense reconstruction, though those are typically handled by a commercial appraiser or investment advisor, not the home inspector.

Manufactured and Mobile Homes

Factory-built housing requires inspection knowledge that overlaps with site-built residential but adds specifics. The HUD code governs manufactured homes built after 1976. Inspectors check the data plate, foundation system, tie-downs, and skirting. Older mobile homes built before 1976 fall outside the HUD code and have higher rates of electrical and plumbing nonconformity. Most state-licensed inspectors do inspect manufactured homes; some specialize.

Older Housing and Pre-1978 Considerations

Residential homes built before 1978 carry lead-based paint risk under federal law. The EPA’s Renovation, Repair, and Painting rule applies to certain disturbances during work. Pre-1980 housing also raises asbestos concerns for popcorn ceilings, vinyl floor tiles, pipe wrap, and siding. The inspector documents the age of the home and notes suspect materials but typically does not sample. Buyers who want sampling can hire a separate testing service. For details on that scope, our asbestos and lead pre-1978 hazard guide covers what testing involves.

Front Range Property-Type Notes

Denver metro and Front Range housing stock skews to single-family detached in the suburbs and townhouse or condo in the urban core. Newer master-planned communities mix townhouses and detached homes within the same HOA. Buyers should verify which structures the HOA covers before assuming exterior scope. Boulder and Denver have a meaningful percentage of pre-1978 housing where lead and asbestos screening matters. All Front Range counties sit in EPA Radon Zone 1, so radon testing should be added to the inspection regardless of property type.

Common Inspection Scope by Property Type

Buyers comparing inspection quotes across property types should expect: single-family detached, full scope; townhouse, full unit scope plus partial exterior; condo, walls-in scope only; duplex and small multi-family, full scope per unit plus shared systems; manufactured home, full scope with HUD-code awareness. Inspection fees scale with time and complexity, not just square footage.

How to Read a Residential Report by Property Type

The summary section of every report flags safety issues and significant defects regardless of property type. Where reports diverge is the depth of system reporting. A single-family report has full system sections. A condo report may have very short exterior and roof sections noting only what was visible from grade or common areas. A duplex report has parallel sections per unit. Buyers should match expectations to property type before reading the report, or a short condo report can feel incomplete when it is in fact correctly scoped.

Specialty Inspections Layered Onto Residential

Several specialty inspections layer onto any residential type. Radon testing, sewer scope, well water testing, septic certification, structural engineering review, and chimney inspection each get scheduled separately. The general residential inspector flags conditions warranting these specialties but does not perform them. Buyers should coordinate scheduling across vendors during the inspection contingency period, which typically runs ten to fourteen days from offer acceptance.

When the Property Crosses Categories

Some properties sit at the boundary between categories. A “carriage house” detached unit on a single-family lot may or may not count as a separate residence depending on local zoning. A converted four-unit building larger than the four-unit residential limit may require a commercial-scope inspection. Buyers in these situations should ask the inspector before booking whether the property fits a standard residential checklist or needs an expanded scope. Quoting accurately requires knowing the structure.

References

• ASHI Standard of Practice for residential inspection — American Society of Home Inspectors
• InterNACHI Residential Standards of Practice — International Association of Certified Home Inspectors
• HUD manufactured home standards — U.S. Department of Housing and Urban Development
• International Residential Code reference — International Code Council