What Should You Know Before Buying a 100-Year-Old Home in Oakland?

Know that the house has had many owners, and each one cared for it differently. A 100-year-old Oakland home can be beautifully maintained or quietly worn out, and two houses on the same street can be in very different shape. Before you buy, check the foundation and drainage, the electrical system, the roof, the sewer line, and any additions, and know which issues are cosmetic and which are serious.

Tanja Odzak is a Top East Bay Realtor with eXp Realty, helping buyers and sellers in Oakland and across the East Bay. I'm known as the East Bay's old-home specialist, and most of what's for sale in Oakland is 75 to 100-plus years old. I can usually tell you what's really going on with a property, foundation, drainage, an addition done well or badly, before an inspector ever sets foot in it.

This guide covers what I look for, the inspections worth paying for, and the mistakes that make an old house more expensive than it looks.

After the 1906 earthquake, so many San Franciscans moved across the Bay that Oakland's population doubled. The neighborhoods of bungalows and Craftsman homes that filled in over the next decades are a big part of the housing stock still here today: century-old Craftsmans along Piedmont Avenue, 1920s bungalows in the Dimond District, Mediterranean and Tudor homes in Oakmore, and brown-shingle and stucco homes in Rockridge.

That history is the charm. It's also the reason old-home issues come up again and again.

Foundation and drainage. These come up often, especially in the hillier neighborhoods. Look for cracks, sloping floors, sticking doors, and water where it shouldn't be. Drainage problems are often fixable. Foundation work can be a major cost.

Electrical. Original electrical panels and knob and tube wiring that still remains are common. Some are fine for now, some aren't, and insurers and lenders may have opinions. An electrician's eyes matter here.

Roofs. Roofs laid over older roofs are common. There's a limit on how many layers a house can have, so the next roof may need a full tear-off, which costs more.

The sewer lateral. Oakland is part of the East Bay regional sewer lateral program, and a compliance certificate, or a time extension certificate, is needed before escrow can close. Know the status early so it's negotiated, not discovered late.

Additions and in-law units. Unpermitted additions and units are common in older Oakland homes. Unpermitted space usually isn't counted as legal square footage, and it can affect insurance and resale.

Floor plans from another era. Small closets, one bathroom, a closed-off kitchen. These are livability questions more than repair questions, and they belong in your budget for later.

The Hayward Fault runs along the base of the Oakland hills, and in 2025 the City kept most of the hills in its Very High Fire Hazard Severity Zone. You receive hazard disclosures on every purchase, and a sale in the zone includes defensible space paperwork under state law.

I recommend checking insurance options early, along with the home's foundation, any seismic retrofit, and the defensible space around it. Many hill homes also have stairs and slopes, so weigh them against what you want day to day. And because of the 1991 Oakland hills firestorm, some hill neighborhoods mix older houses with homes rebuilt in the 1990s.

On a 100-year-old home, the general home inspection is the start, not the finish. Depending on what we see, I often recommend adding:

• A sewer lateral inspection with a camera down the line.
• A foundation or structural look if the general inspector flags anything.
• A roof inspection, especially if there are visible layers.
• An electrical evaluation when the panel or wiring is original.
• A pest inspection, which is common in California sales.

In Oakland, many sellers provide inspections before offer day. Read them closely, and ask me what they mean for price.

Every old house has a list. The smart move is to put that list in order before you close, while you still have the inspection reports in hand. Here's the order I suggest:

1. Safety first. Electrical issues an electrician flags, and anything involving gas or water where it shouldn't be.
2. Keep water out. The roof, gutters, and drainage around the house. Water does more damage to an old home than almost anything else.
3. Protect the structure. Foundation work and any seismic retrofit, especially on a hill home.
4. Then the systems. Plumbing, heating, and the sewer lateral if it wasn't already handled in the sale.
5. Then the fun stuff. Kitchens, baths, paint, and the floor plan changes you've been dreaming about.

Get rough bids during your inspection period for the items at the top of the list, so your offer and your budget reflect them. And keep a cushion. On a 100-year-old house, opening a wall sometimes finds something no inspection could see.

Here's how I walk buyers through it:

1. Pre-approval and representation first, before touring, so you're ready the day the right home shows up.
2. We tour with an old-home lens. I point out what looks cosmetic and what might be serious, right there in the house.
3. We read the disclosures and seller inspections together.
4. We add our own inspections where they matter.
5. I build your offer from comps for that street, adjusted for what the inspections found. You can see the full process on how I help you buy.
6. We plan for after closing. Which projects come first, and who to call.

Falling for the woodwork and skipping the basement. Character is easy to see. Foundations take a closer look.

Treating every issue as a deal-breaker. Most old homes have a list. The question is whether the list is priced in.

Ignoring the sewer lateral. It's a required step in Oakland, and an old pipe can be a real cost.

Assuming the extra room is legal. Unpermitted space can affect value, insurance, and resale.

Not checking insurance in the hills early. Find out before you're under contract.

One first-time buyer I worked with closed in two weeks and said, "she got it done with time to spare." Another first-time buyer wrote that I was "even helping us after closing, helping to find repair people, making suggestions for next steps, answering first time homeowner questions."

That's the part people don't expect. As a Top East Bay Realtor with eXp Realty, helping buyers and sellers in Oakland and across the East Bay, my job on an old house doesn't end at the keys. No question is a dumb question with me, before or after closing.

Start by sending me the house you love. Tanja Odzak is a Top East Bay Realtor with eXp Realty, helping buyers and sellers in Oakland and across the East Bay, and I'll tell you what I'd check before you write an offer. Read more about buying a home in Oakland, see my guide for first-time buyers in Oakland, or send me a listing.