Thinking about building your dream home in Los Altos? Before you break ground, there’s something critical you need to know: setbacks. No, not emotional ones (though you might have those too)—I’m talking about the city-mandated invisible lines that tell you where you can’t build. Let’s break it down.
What Exactly Is a Setback?
A setback is the minimum distance your home (or any structure) must be from your property lines. They apply to the front, sides, rear, and sometimes even second-story additions.
Setbacks are designed to protect things like:
Light and airflow between homes
Privacy
Fire safety
The overall “look” of the neighborhood
They’re not suggestions—they’re non-negotiable. Build over a setback, and you’ll be tearing that wall down faster than you built it.
Los Altos Setback Rules by Zoning
| Zoning District | Front Setback | Side (1st Story) | Side (2nd Story) | Rear Setback | Corner Side |
|---|---|---|---|---|---|
| R1-10 | 25 ft | 10 ft | 17.5 ft | 25 ft | 20 ft |
| R1-H / R1-20 | 30 ft | 20 ft | 25 ft | 35–50 ft | 25 ft |
| R1-40 | 50 ft | 30 ft | 30 ft | 50 ft | 30 ft |
Always double-check your parcel’s zoning—these numbers aren’t universal.
What About Corner Lots?
Corner lots are treated a bit differently. Both street-facing sides are considered front yards, meaning you’ll need to comply with two front setbacks, not just one. Yup, double the space you can’t build on.
But hey—corner lots are also prime for creative landscaping and curb appeal.
Setbacks for ADUs (Accessory Dwelling Units)
Building an ADU? Here’s what you need to know:
Detached ADU: Must be at least 4 feet from rear and side property lines
Attached ADU: Follows the main home’s setbacks
JADU (Junior ADU): May be exempt from some setbacks but must still comply with other building codes
And of course, you’ll need separate permits and plans reviewed by the City.
Pro Tips to Make Setbacks Work for You
Know your zone – Confirm if you’re R1-10, R1-H, etc.
Use setbacks creatively – Outdoor seating, gardens, art walls.
Schedule a pre-submittal meeting – Los Altos Planning can flag red zones early.
Hire a local architect – They already know the city quirks and codes.
Don’t assume ADU = freedom – Setback rules still apply.
Final Takeaway
Setbacks aren’t here to ruin your dream home—they’re here to protect the neighborhood vibe, your privacy, and future property values. In Los Altos, they’re strict—but workable. Plan ahead, get professional help, and build smart.
DRE ID: 02194323 | NRDS#: 198039676 | MLS ID: 02194323
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