LOTCHECK

Free Tool

Setback Calculator

Q: How do I find my lot dimensions?

Check your property survey, title report, or county assessor website. You can also use Google Earth or LotCheck's parcel search to find lot area.

Q: Do ADUs have different setback requirements?

In many cases, yes. Some states reduce ADU setbacks by law. For example, California requires only 4-foot rear and side setbacks for detached ADUs. Other states defer to local codes.

Q: Can setbacks change based on building height?

Yes. Many cities increase side setbacks for two-story construction by 1–3 additional feet.

Q: What's the difference between setback and buildable area?

Setbacks define minimum distance from property lines. Buildable area is what remains after subtracting all setbacks — the space where your building can go.

Calculate your buildable area based on your city's setback requirements. Every city defines minimum distances your structure must be from each property line — front, side, and rear. Enter your lot dimensions and zone code to see an instant visual diagram of your buildable envelope, maximum footprint, and whether your coverage exceeds zone limits.

✓ Visual lot diagram showing setback lines and buildable area
✓ City-specific setback values for 30 cities across CA, FL, and TX
✓ Lot coverage percentage calculated automatically
✓ Height limits and zone notes included in results

City

Lot Width (ft)

Lot Depth (ft)

Zone Code (optional)

How the Setback Calculator Works

Enter your lot dimensions

Provide your lot width and depth in feet. You can find these on your property survey, title report, or county assessor records.

Select your city and zone

Choose from 30 supported cities across California, Florida, and Texas. If you know your zone code (R1, R2, etc.), enter it for precise setback values from your city's municipal code.

See your buildable area

Get an instant visual showing your buildable envelope — the area remaining after setbacks. See max footprint, coverage percentage, and height limits.

What Are Building Setbacks?

Building setbacks are the minimum distances your structure must be from each property line. Every city defines setbacks by zone — residential zones like R1 typically require larger setbacks than commercial zones.

There are three types of setbacks:

Front setback — distance from the street-facing property line. Usually the largest, often 15–25 feet in residential zones.
Side setback — distance from each side property line. Typically 3–5 feet for single-story, sometimes more for two-story structures.
Rear setback — distance from the back property line. Usually 15–25 feet, though ADUs may have reduced setbacks depending on your state and local rules.

Setbacks affect your buildable envelope — the area of your lot where construction is physically allowed. Understanding your setbacks before you design saves time, avoids plan check rejections, and prevents costly redesigns.

Common Residential Setbacks

While setbacks vary by city and zone, here are typical residential setback ranges:

Front:15–25 ft (some infill zones allow 10 ft)
Side (interior):3–10 ft per side (increases with building height in some cities)
Side (corner):10–15 ft on the street-facing side
Rear:15–25 ft (ADUs may have reduced rear setbacks under state or local law)

These are starting points — your specific zone may differ. Always verify with your city's municipal code or run a full plan check before submitting plans.

Frequently Asked Questions

How do I find my lot dimensions? +

Check your property survey (from when you purchased), title report, or your county assessor's website. You can also measure using Google Earth or search your address on LotCheck's parcel search to see lot area. For exact dimensions, a licensed surveyor can provide a certified lot survey.

What happens if I build within the setback area? +

Building within a setback without a variance is a code violation. Your city can require you to demolish the encroachment, deny a certificate of occupancy, or issue fines. Some cities allow setback exceptions through a variance process (typically $5,000–$15,000 in fees and several months of hearings).

Do ADUs have different setback requirements? +

In many cases, yes. Some states have laws that reduce ADU setback requirements. For example, California state law requires only 4-foot rear and side setbacks for detached ADUs, regardless of local zoning. Other states defer to local city codes. Check your eligibility with our ADU Eligibility Checker.

Can setbacks change based on building height? +

Yes. Many cities increase side setback requirements for two-story construction — often by 1–3 additional feet. Some cities also have "transitional height" rules that increase setbacks when your building is significantly taller than neighbors. This calculator uses standard single-story setbacks as a baseline.

What's the difference between setback and buildable area? +

Setbacks define the minimum distance from property lines. Your buildable area (or buildable envelope) is what's left after subtracting all setbacks — it's the rectangle where your building footprint can go. Note that your actual building may be smaller than the buildable area if lot coverage limits apply. Use our FAR Calculator to check floor area limits.