Embarking on a home buying journey in Washington State? Congratulations! Before you finalize your purchase, it's crucial to conduct a thorough home inspection to ensure you're investing in a safe and sound property. This comprehensive Washington State home inspection checklist will guide you through the process, helping you identify potential issues and make informed decisions.
Understanding Washington State Home Inspection Standards
Washington State follows the InterNACHI (International Association of Certified Home Inspectors) standards, which cover over 1,600 items in a typical home inspection. The checklist ensures that the home's major systems and components are functioning correctly and are in good condition. Always hire a licensed home inspector to perform the inspection and provide a detailed report.
Pre-Inspection Preparations
Before the inspection, ensure the home is accessible, and all utilities are turned on. Notify the seller or their agent about the inspection, and request a copy of the inspection report. Familiarize yourself with the Washington State home inspection standards and the InterNACHI checklist to understand what to expect.

What's Included in a Washington State Home Inspection?
- Roof, exterior, and structure
- Electrical system
- Heating and cooling systems
- Plumbing and water heating
- Interior and exterior walls, ceilings, and floors
- Windows and doors
- Insulation and ventilation
- Foundation, basement, and crawlspaces
- Grading and drainage
- Deck, porch, and patio
- Miscellaneous items, such as smoke detectors and safety features
Washington State Home Inspection Checklist: Key Areas to Inspect
Roof, Exterior, and Structure
| Component | Inspection Items |
|---|---|
| Roof | Roof covering, flashing, chimneys, vents, and gutters |
| Exterior | Siding, trim, eaves, soffits, and fascias |
| Structure | Foundation, basement, and crawlspaces; walls, columns, and piers; and floor structure |
Electrical System
The home inspector will examine the electrical system, including service entrance wires, service panel, and main disconnect. They will also check all visible branch circuits, outlets, switches, and light fixtures. Ensure the electrical system is up to code and safe for use.
Heating and Cooling Systems
The inspector will assess the heating and cooling systems, including the type, age, and overall condition. They will also check for proper ventilation, insulation, and safety features. Ensure the systems are functioning correctly and are energy-efficient.
Plumbing and Water Heating
The home inspector will examine the plumbing system, including water supply and distribution, drainage, and venting. They will also check the water heater, including its type, age, and energy source. Ensure there are no leaks, clogs, or other issues that could lead to costly repairs.

Post-Inspection: Reviewing the Report and Negotiations
After the inspection, review the report thoroughly and discuss any findings with your real estate agent. If necessary, negotiate with the seller to address any issues or repair costs. Keep in mind that minor issues are common in older homes, and it's essential to focus on significant problems that could impact your safety or budget.
By following this comprehensive Washington State home inspection checklist, you'll be well-equipped to make an informed decision about your potential new home. Don't hesitate to ask your home inspector for clarification or additional information to ensure you fully understand the property's condition.