Torrance Expansive Soil: What Home Buyers and Sellers Should Know
Every so often I'm touring a home with buyers and someone stops in the hallway, points at a thin crack in the wall, and whispers, "Is that the foundation?"
Nine times out of ten it's a hairline crack, and in parts of Torrance, hairline cracks come with the territory. The reason is the dirt. Let's talk about it, because it's not scary once you know what you're looking at.
What is expansive soil?
It's clay soil (the city also calls it "adobe") that swells when it's wet and shrinks when it dries out. Think of a sponge under your house. It's a natural thing, not a flaw anyone caused.
The City of Torrance maps it. Expansive soil areas cover much of North Torrance (north of 190th Street) and part of southwest Torrance around Hawthorne Boulevard and Pacific Coast Highway, near the old Walteria Lake area. There's also a smaller "Expansive Soil Study Zone" near Anza Avenue and Pacific Coast Highway, where the city has special foundation requirements.
What it can look like in a house
Because the ground moves a little as it wets and dries, the footings can settle unevenly over the years. According to the city, homes on this soil tend to have more hairline cracks in walls and slabs than homes on sandy soil. Other signs are doors and windows that stick, and floors that start to slope.
Minor movement can't be fully prevented, but major damage can be limited. A fresh coat of paint or stucco won't fix a soil problem, so if something is moving, cosmetic repairs are just a cover-up.
What I look for when we tour
Here's my quick list for homes in these areas:
Drainage. Does water pond near the house after a storm? The city suggests checking an hour or two after rain.
Downspouts. Do they send water away from the house, toward the street?
Trees. Big ones planted close to the house pull a lot of moisture out of the soil. The city suggests keeping trees about ten feet away, and farther for larger ones.
Cracks. Thin and old is one thing. Wide, growing, or showing up in a hurry is another.
Leaks and water use. Plumbing leaks soak the soil, and an unexplained jump in the water bill can be a clue.
If anything looks off, we bring in a professional. A geotechnical engineer can inspect the site and test the soil, and that gives you real answers before you decide.
If you're selling a Torrance home
Please don't paint over it. Buyers (and their inspectors) are going to look at the drainage and the cracks anyway, so it's much better to be the one with the answers. Pull together your repair records, any past inspection reports, and notes on drainage or landscaping work. Tell me what you know before we list, and we'll figure out the best way to present it. A home with a clear paper trail feels calmer to a buyer than a home with a mystery.
So, is it a dealbreaker?
Usually not. Lots of well-loved Torrance homes sit on expansive soil, and the people who live in them do a few simple things: keep the drainage working, water evenly, and fix leaks quickly. The goal is to know what you're getting into, not to avoid it.
I'm a Realtor, not an engineer, so for anything specific to a house, we'll lean on the pros. But I'll help you ask the right questions and know when to call them.
Questions I Get Asked a Lot
Where is expansive soil in Torrance?
North Torrance (north of 190th Street) and part of southwest Torrance around Hawthorne Boulevard and Pacific Coast Highway. The city's map above shows the exact areas.
Is expansive soil a dealbreaker when buying a home in Torrance?
Usually not. Many well-loved Torrance homes sit on expansive soil. The goal is to know what you are getting into: check drainage, trees, cracks, and repair records, and bring in a geotechnical engineer if anything looks off.
Who do I call about a specific address?
The city's Grading Division can help with a specific property: (310) 618-5910. And you can always call me.
Want to talk it through?
Looking at homes in Torrance, or thinking about selling one? Call or text me, and we'll go through it together. No pressure, no pitch. I've got your back.
Call or text 310.995.2310Sources: City of Torrance Expansive Soil Guidelines · City of Torrance Expansive Soil Guide (PDF) · City of Torrance Expansive Soil Foundation Map for Residential Construction (Community Development GIS).