What a Former Construction Superintendent Looks For When

Open houses are designed to look their best. Fresh paint, good lighting, and staged furniture make a home feel ready to move into. But the problems that cost buyers the most money are rarely the ones you can see from the doorway.Before I became a real estate agent, I spent five years as a construction superintendent on residential and commercial projects. My job was to find problems before they became expensive. I still walk every home that way. This is the checklist I use when I tour Bay Area homes with my buyers, and what each warning sign usually means.One important note: I am not a licensed home inspector or structural engineer. A tour is about spotting red flags early, so you know which questions to ask and which professional inspections to order before you remove your contingencies.

1. Foundation and settling

The foundation is the most expensive part of a house to fix, and many Bay Area homes are 60 to 100 years old. When I walk through, I look for:

Doors that stick or won't latch, and gaps above doors that are wider on one side
Floors that slope noticeably, especially toward the middle of the house
Diagonal cracks running from the corners of windows and doors
In the garage or crawlspace: wide or uneven cracks in the concrete, crumbling or brick foundations, and wood posts sitting directly on dirt

Small hairline cracks in concrete are normal. Cracks that are wide, uneven on each side, or that have clearly grown are worth a structural engineer's opinion.Earthquake readiness matters here too. Many older homes were never bolted to their foundations or braced at the short walls under the floor. Ask whether a seismic retrofit was done and permitted. California's Earthquake Brace + Bolt program offers grants for this work in eligible zip codes. In San Francisco, many older wood-frame apartment and condo buildings with parking on the ground floor were required to complete a soft-story retrofit, so ask for that paperwork if you are buying in one.

2. Water and drainage

Water is the most common source of hidden damage I see. It is also the easiest to cover up before a sale. Signs I look for:

Stains on ceilings, especially below bathrooms, or one patch of fresh paint on an otherwise older ceiling
A musty smell in the basement, garage, or closets
White, chalky mineral deposits on concrete walls and floors, which show that water has been moving through them
Warped or soft flooring around toilets, tubs, and dishwashers
Soil that slopes toward the house, and downspouts that empty right next to the foundation

On hillside homes in places like the Oakland Hills or the hills of San Francisco and the Peninsula, I also look at retaining walls. A wall that leans, bulges, or has no visible drainage behind it can be a very expensive repair.

3. Roof and gutters

I ask how old the roof is and whether it was replaced with a permit. On sloped roofs, curling or missing shingles and heavy moss are signs of age. Many San Francisco homes have flat roofs, where the bigger risk is water pooling and an aging membrane. Overflowing or sagging gutters often point to drainage problems on the ground below. If the roof is near the end of its life, it should be part of your negotiation, not a surprise after closing.

4. Electrical

Older electrical systems are a safety issue and can also make homeowners insurance harder to get. I look for:

Two-prong outlets, which often mean the wiring is not grounded
Signs of knob-and-tube wiring, common in homes built before the 1950s
Older panel brands that inspectors often flag, such as Federal Pacific and Zinsco
A small main panel. Many older homes have 100-amp service or less, which may not be enough if you want to add an EV charger, a heat pump, or an induction range

5. Plumbing and the sewer lateral

Many older homes still have galvanized steel water pipes, which corrode from the inside. Low water pressure or rusty water can be a clue. The bigger item is the sewer lateral, the pipe that carries waste from the house to the city line. In older neighborhoods these are often clay pipes that crack or fill with tree roots. A sewer camera inspection is one of the most valuable few hundred dollars you can spend. In parts of the East Bay, a sewer lateral compliance certificate is also required when a home is sold, so ask whether one has been issued.

6. Unpermitted work

In-law units, garage conversions, extra bathrooms, and finished basements are common in the Bay Area, and many were done without permits. Signs include low ceilings, rooms reached only through the garage, unusual wiring, and square footage that does not match public records. Unpermitted work can affect safety, insurance, financing, and the price you should pay. It may also need to be legalized or removed later. Ask for the permit history, and check it with the city's building department.

7. Water heater, heating, and safety basics

California requires water heaters to be strapped for earthquakes, and sellers must certify smoke and carbon monoxide detectors when they sell. I also check the age of the water heater and furnace, look for rust or scorch marks, and note single-pane windows, which affect both comfort and energy bills.

How to read the inspection reports

Many Bay Area sellers provide inspection reports up front. They are useful, but they are written by inspectors the seller hired, so read them closely. A few tips:

**Separate safety, water, and structure from cosmetic items.** A long report full of small items is normal. Three serious items matter more than thirty minor ones.
**Understand the pest report sections.** In California, Section 1 items are active problems, such as current infestation or dry rot, and Section 2 items are conditions likely to lead to them.
**Follow every recommendation for further evaluation.** When an inspector writes "recommend evaluation by a licensed specialist," that specialist's report is where the real cost shows up.
**Order your own inspections when it matters.** For older homes, a sewer camera, roof, or structural inspection of your own is often worth it.

What to do when you find something

Finding problems does not mean you should walk away. Every older home has something. The goal is to understand the cost before you commit. During your contingency period, I help my buyers get contractor estimates for the major items. With real numbers, you can decide whether to ask for a price reduction, a credit at closing, repairs by the seller, or, sometimes, to move on. A credit is often easier for both sides than asking the seller to manage repairs.

Let's walk it together

Buying an older Bay Area home can be a great decision when you know exactly what you are getting. If you are touring homes in San Francisco, the Peninsula, or the East Bay, I am happy to walk through them with you and point out what to look at more closely, in English or Mandarin.Sky Lin | Mosaik Real Estate | DRE #02253259

Sky Lin Real Estate Agent Area served: San Francisco, CA, Alameda County, CA, San Mateo, CA, San Mateo County, CA, Redwood City, San Mateo County, CA, Berkeley, Alameda County, CA, Oakland, Alameda County, CA, Millbrae, San Mateo County, CA, Palo Alto, Santa Clara County, CA, Burlingame, San Mateo County, CA, Foster City, CA, San Carlos, CA Expertise: International Buyers, First-Time Buyer