Commercial vs Residential Inspections: What's Different

If you’re buying your first small commercial property — a retail building, a small office, a mixed-use building — the inspection process looks different from a residential purchase. Here’s what changes, and what it means for your timeline and budget.

The standards are different

Residential inspections in Illinois follow the InterNACHI or AHIT Standards of Practice plus the Illinois Home Inspector License Act. There’s a clearly defined scope.

Commercial inspections follow the ASTM E2018 Standard for Property Condition Assessments — and the scope is negotiated. You decide, with your inspector, what gets covered before the inspection happens.

This means commercial inspections range from a basic walkthrough (similar to a residential inspection) all the way up to a full ASTM E2018 Property Condition Assessment with a 5-year capital needs analysis. The price scales accordingly.

What’s typically included

For a basic small-commercial inspection on a building under 10,000 sq ft:

• Roof — type, age, drainage, flashing, ponding
• Building envelope — masonry, cladding, windows, doors, sealants
• Structural — visible foundation, framing, signs of settlement or movement
• HVAC — equipment age, condition, capacity vs. building load
• Electrical — service capacity, panel condition, lighting, exit signs
• Plumbing — supply, waste, water heater(s), restroom fixtures
• Life safety — fire suppression presence, egress, accessibility approach
• Site — parking, drainage, signage support, accessibility from public right-of-way
• Interior finishes — overall condition, ADA considerations

For a full ASTM E2018, add:

• Capital reserve study (5-year capital needs forecast)
• Environmental Phase I screening (separate vendor)
• ALTA survey coordination (separate vendor)
• Detailed photographic documentation suitable for lender underwriting

The report is structured differently

A commercial inspection report leads with an executive summary that your lender, insurer, and attorney can read in 5 minutes. It then provides the detailed findings, photo documentation, and capital recommendations.

The report is written in language a lender expects — quantified observations, estimated remaining useful life of major systems, and prioritized capital recommendations.

Timing and cost

• Small commercial walkthrough: $650–$1,200, 2–4 hours on site
• Full ASTM E2018 PCA: $2,500–$5,000+ depending on size and complexity, 1–2 days on site plus document review

For most small-commercial purchases under $1M, the basic walkthrough is sufficient. Full PCAs are typically required by lenders for transactions over $1M or for commercial mortgage-backed securities.

What to send your inspector ahead of time

To make the inspection efficient, gather and send:

• Building age, size, construction type
• Most recent roof, HVAC, and electrical service records
• Any prior inspection or PCA reports
• ALTA survey if available
• Current rent roll if multi-tenant

With these in hand, your inspector can focus on-site time on what matters most.

A few things commercial buyers underestimate

• Roof remaining life — a single-ply membrane near the end of life can be a $50,000+ surprise
• HVAC commercial-grade replacement costs — rooftop units run $15,000–$50,000 each
• ADA compliance — older buildings often have grandfathered non-compliance that gets triggered when you do tenant improvements
• Underground utilities — visual inspection only; consider a separate utility locate if you’re doing site work
• Environmental — even if your lender doesn’t require Phase I, ask whether prior site uses (auto, dry cleaner, gas station) merit one

Get a commercial inspection quote — tell us the property type, size, and your timeline and we’ll quote within one business day.