7 Home Inspection Red Flags I Look For First
Last updated July 19, 2026

Quick answer
The costliest home problems are usually structural, electrical, roofing, drainage, or permit-related, not cosmetic. Before you fall for finishes, check the panel, roof age, grading and moisture, foundation, plumbing, and whether additions were permitted. These are the issues I inspect first.
Beautiful kitchens sell homes; hidden systems cost you money. My background in electrical work and home inspection shapes how I tour a property, I look past the staging at the things that actually drain bank accounts. Here are seven I check first.
1. The electrical panel
Outdated or overloaded panels, certain recalled brands, and amateur wiring are safety and cost issues. On homes being modernized for EV charging and heat pumps, capacity matters more than ever.
2. Roof age and condition
A roof near the end of its life is a five-figure conversation. I note the material, visible wear, and signs of past leaks so we can factor it into value and negotiation.
3. Grading and drainage
Water should flow away from the house. Poor grading, short downspouts, and pooling near the foundation lead to the most expensive problems in any home.
4. Foundation and structure
Stair-step cracks, sloping floors, and sticking doors can be cosmetic, or they can signal movement. I flag anything worth a specialist's eye before your money is at risk.
5. Plumbing and water heater
Old galvanized pipes, past leaks under sinks, and an aging water heater are common and negotiable. Knowing about them early keeps them from becoming surprises.
6. Unpermitted work
That "bonus room" or garage conversion may not be permitted, which affects value, insurance, and your ability to resell. I check what's on record versus what's on site.
7. Signs of moisture and pests
Staining, musty smells, and evidence of termites or rodents point to issues behind the walls. In our climate, moisture intrusion deserves special attention.
None of these should necessarily scare you off a home, every property has something. The point is to know before you commit, so we can price the risk or negotiate for it. That's the protection a thorough inspection, and an agent who understands it, provides.
About the author
Rob Pelayo is a licensed Sunnyvale REALTOR® (DRE #02195342) with Momentum Realty and an InterNACHI Certified Professional Inspector (NACHI26011524). With a background in electrical work, he helps buyers and sellers across Sunnyvale and Silicon Valley make evidence-based decisions.
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