Key Takeaways
- Follow a consistent path in each unit for completeness—front door through living room, kitchen, bath, bedrooms, closets.
- Record equipment data (manufacturer, model, serial number) for every HVAC unit, water heater, and electrical panel.
- Rate each unit on an A-D scale (move-in ready to major renovation) for quick portfolio-level condition assessment.
- Photograph every piece of equipment, every defect, and every room of each inspected unit for post-inspection reference.
A systematic walk-through methodology ensures every building system is evaluated thoroughly. This lesson provides the step-by-step walk-through procedure for each major system, with specific items to check, photos to take, and questions to ask during the field inspection.
Exterior and Site Walk-Through
Start from the outside and work inward. Begin by walking the property perimeter: inspect foundation walls for cracks, displacement, or water staining. Check siding for damage, rot, paint failure, or pest entry points. Examine windows for seal failure (fog between panes), frame rot, and caulking condition. Inspect the roof from the ground (binoculars help) and request roof access for flat roofs. Check gutters and downspouts for proper connection, slope, and discharge away from the foundation. Evaluate the parking lot for cracking, potholes, drainage, and striping. Check site grading—water should slope away from the building at 6 inches per 10 feet minimum. Photograph: every building elevation, any visible damage, the roof surface, and the parking lot condition.
Mechanical Room and System Walk-Through
Mechanical rooms contain the building's vital systems. Record every piece of equipment: manufacturer, model number, serial number (for age verification), capacity, and fuel type. For HVAC: check air filters (dirty filters indicate poor maintenance), inspect ductwork for damage or disconnection, verify thermostat operation, and listen for unusual sounds during operation. For water heaters: record age (from serial number), capacity, temperature setting, and look for corrosion or water stains at the base. For electrical: photograph every panel (cover off), note the manufacturer (flag Federal Pacific and Zinsco), record total service amperage, and note any double-tapped breakers or missing knockouts. For boilers: check for the inspection certificate (required annually in most jurisdictions), note water treatment equipment, and inspect for leaks.
Unit Interior Walk-Through Protocol
For each inspected unit, follow a consistent path: start at the front door, proceed to the living area, then kitchen, bathrooms, bedrooms, and closets. Kitchen: check under the sink for leaks, test all appliances, inspect countertops and cabinetry, check ventilation (range hood venting to exterior). Bathrooms: check for moisture around the tub/shower (soft floors indicate subfloor rot), test faucets for pressure and temperature, check for mold on caulking, inspect toilet for stability and leaks, verify exhaust fan operation. Throughout: test all outlets (especially GFCI in wet areas), check for adequate heating/cooling, inspect windows for operation and seal condition, note flooring condition, and look for evidence of pests. Record the overall condition rating for each unit: A (move-in ready), B (minor cosmetic refresh), C (moderate renovation), D (major renovation).
| System | Key Inspection Items | Remaining Useful Life | Replacement Cost Range |
|---|---|---|---|
| Roof | Age, material, drainage, flashing, penetrations | 20-30 years (shingle); 30-50 (metal) | $8K-$15K (SFR); $5-$12/SF (commercial) |
| Foundation | Cracks (width/direction), settling, water intrusion | 75-100+ years | $5K-$50K+ (repair); $75K+ (replacement) |
| HVAC | Age, capacity, efficiency, ductwork condition | 15-20 years (furnace); 10-15 (AC) | $5K-$12K per unit |
| Plumbing | Pipe material (copper, PEX, galvanized, polybutylene), water pressure, sewer scope | 40-70 years (copper); 25-40 (PEX) | $8K-$25K (repipe SFR) |
| Electrical | Panel capacity, wiring type, GFCI compliance, grounding | 25-40 years (panel); 30-50 (wiring) | $3K-$15K (panel upgrade) |
| Windows/Doors | Seal integrity, frame condition, hardware, energy rating | 20-30 years | $300-$800/window; $1K-$3K/exterior door |
| Structural | Framing, load-bearing walls, floor joists, subfloor | 50-100+ years | $10K-$100K+ (major structural) |
| Exterior | Siding condition, paint, grading/drainage, driveway | 15-30 years (siding varies by material) | $5K-$25K |
Physical due diligence inspection matrix with remaining useful life and replacement cost benchmarks. Always hire a licensed inspector for professional assessment. Source: ASHI Standards of Practice, RSMeans, 2024.
Schedule & Milestones
Day 1 (8am-4pm): exterior walk-through of all buildings (2 hours), mechanical room inspection (1 hour), common area inspection (1 hour), inspect 6 units (30 minutes each, 3 hours). Debrief notes (1 hour).
Day 2 (8am-1pm): inspect remaining 4 units (2 hours), roof inspection with roofing specialist (1 hour), sewer scope with plumber (1 hour), compile photo log and preliminary findings (1 hour).
Unit selection: 2 units from each of the 4 buildings, plus 2 vacant units. Mix of 1BR and 2BR floor plans, ground floor and upper floor.
Critical findings from walk-through: 7 of 10 units have galvanized supply pipes with visible corrosion at joints. 3 of 10 units show evidence of bathroom ceiling moisture. All units have original 1972 electrical panels (60-amp Zinsco brand).
Pattern recognition: galvanized pipe corrosion is systemic (affecting 70%+ of units sampled). Bathroom moisture traces to missing exhaust fans (systemic 1972 construction). Zinsco panels are a known hazard affecting all 32 units.
Preliminary cost estimate: galvanized pipe replacement ($3,500/unit x 32 = $112,000), bathroom ventilation ($400/unit x 32 = $12,800), electrical panel replacement ($3,000/unit x 32 = $96,000). Total systemic items: $220,800.
Key Takeaways
- ✓Follow a consistent path in each unit for completeness—front door through living room, kitchen, bath, bedrooms, closets.
- ✓Record equipment data (manufacturer, model, serial number) for every HVAC unit, water heater, and electrical panel.
- ✓Rate each unit on an A-D scale (move-in ready to major renovation) for quick portfolio-level condition assessment.
- ✓Photograph every piece of equipment, every defect, and every room of each inspected unit for post-inspection reference.
Sources
- ASHI — Multifamily Inspection Standards(2025-01-15)
- InterNACHI — Commercial Property Inspection Standards(2025-01-15)
Common Mistakes to Avoid
Inspecting only the units the seller or property manager suggests
Consequence: Biased sample misses units with known issues that the seller wants to conceal
Correction: Select inspection units randomly, plus all vacant units and any units with work orders or tenant complaints
Rushing through units without documenting conditions photographically
Consequence: Verbal descriptions lose specificity; without photos, findings cannot be effectively used in renegotiation
Correction: Photograph every significant finding with a reference marker for scale, and maintain a running photo log tied to unit numbers
Test Your Knowledge
1.What is the recommended sequence for a system-by-system walkthrough?
2.What percentage of units should be inspected in a multifamily property?
3.What should be documented during the unit interior walkthrough?