How Close Can I Build to My Property Line in San Bernardino?

You bought a piece of vacant land in the California High Desert.

You know approximately where the property lines are.

Now you're looking at the perfect spot for your house and wondering:

How close can I build to the property line?

The answer depends on something called a setback.

A setback is the minimum distance a building or other development feature must generally be separated from a property line, street, another structure or certain other features.

And unfortunately, there isn't one universal San Bernardino County answer like:

“Every house must be 10 feet from the property line.”

Your required setback can depend on:

• Your zoning
• Which property line you're measuring from
• Whether the property line borders a street
• The type of street
• The type of structure you're building
• The width and configuration of your lot
• Your subdivision
• Easements
• Other development standards
• Special overlays or property-specific requirements

So before positioning your future house based on where you think the property line is:

Find out what setback actually applies to your parcel.

What Is a Building Setback?

San Bernardino County defines a setback as the distance by which a structure, parking area or other development feature must be separated from a lot line, another structure or development feature, or a street centerline.

Most residential properties have several different setbacks:

Front setback

Rear setback

Interior side setback

Street-side setback

These aren't necessarily the same distance.

That's why asking:

“What's my setback?”

isn't quite enough.

We also need to ask:

“Setback from what?”

How Close Can I Build to a Side Property Line?

It depends on the zoning.

For example, under San Bernardino County's standard Desert Region development standards, an RS — Single Residential — property generally has interior side setbacks of:

5 feet on one side and 10 feet on the other.

There are exceptions and special standards.

RL — Rural Living — property is different.

For standard RL parcels:

• Lots 75 feet wide or less generally use 5 feet on one side and 10 feet on the other.
• Other RL lots generally have a 15-foot interior side setback.

Already you can see the problem with saying:

“The setback in San Bernardino County is 5 feet.”

Sometimes it is.

Sometimes it isn't.

What Is the Front Setback?

For standard RS and RL zoning in the County's Desert Region, the general front setback is:

25 feet.

But even that number isn't universal.

For certain RS parcels created through a Final Map or Parcel Map, the map may establish front-yard setbacks of no less than 22 feet if applicable County requirements are satisfied.

Other zoning districts have their own standards.

The parcel itself may also be subject to subdivision requirements or other development standards.

So don't measure 25 feet from what you think is the front property line and start pouring concrete.

Verify first.

What Is a Street-Side Setback?

This matters on corner lots.

A corner parcel can have an interior side and a side that borders another street.

Those aren't necessarily treated the same way.

For standard RS zoning in the Desert Region, the street-side setback is generally:

15 feet along a local street

or:

25 feet along a collector or wider street.

For standard RL zoning, the street-side setback is generally:

25 feet.

That can significantly affect a corner lot's building envelope.

The parcel may look enormous on Zillow.

Then you apply:

Front setback.

Street-side setback.

Interior-side setback.

Rear setback.

Suddenly your giant brown rectangle has gotten considerably smaller.

What Is the Rear Setback?

For standard RS and RL zoning in the Desert Region, the general rear setback is:

15 feet.

Again, that's a general zoning standard.

Property-specific requirements may change the answer.

How Do I Know Which Side Is the Front?

Don't necessarily assume it's obvious.

On a simple rectangular lot with one road frontage, identifying the front may be straightforward.

But vacant desert land can get interesting.

You might have:

• A corner lot
• Multiple road frontages
• An unusual parcel shape
• An easement providing access
• An unnamed dirt road
• A parcel that doesn't physically resemble the assessor map
• Roads that appear on maps but aren't developed on the ground

Determining which property line is considered the front for setback purposes can matter considerably.

If the answer affects your building design, verify it with San Bernardino County rather than making the determination yourself.

Does My Zoning Determine My Setbacks?

Yes, zoning is one of the primary factors.

That's another reason you need the complete zoning designation before buying vacant land.

RS, RL, RC and other zoning districts can have different development standards.

And map suffixes or other property-specific requirements may modify the general standards.

When someone tells me:

“It's residential zoning.”

that's useful.

But if we're trying to determine where a house can actually sit on the property, I want more information.

What Is a Building Envelope?

Think of your property as a piece of paper.

Now draw lines inward from each property boundary based on the required setbacks.

What's left inside those lines is part of your potential building envelope.

That's the area where structures may potentially be placed, subject to all the other requirements affecting the property.

But here's the important part:

Setbacks don't necessarily define your entire usable building area.

You may also need room for:

• Septic system
• Replacement leach area
• Well
• Driveway
• Fire access
• Utility equipment
• Drainage
• Easements
• Protected plants
• Grading
• Other required improvements

So the mathematical building envelope and the practical building envelope aren't always the same thing.

Can I Build Right Up to an Easement?

Don't assume you can.

A utility, access, drainage or other easement can affect where you can place structures even when the easement lies within the zoning setback or apparent building envelope.

That's why reviewing the preliminary title report matters when buying vacant land.

You don't want to design your house first and discover later that Southern California Edison, a neighboring property owner or another party has rights through the middle of your proposed building site.

Property line ≠ only line that matters.

How Do I Know Where My Property Line Actually Is?

Excellent question.

And:

Zillow's parcel outline is not a survey.

Neither is Google Maps.

Neither is walking around until you find a suspicious-looking piece of rebar and declaring victory.

Online parcel maps are useful for understanding the approximate location and shape of property.

But if the exact boundary matters to your construction project, you may need a licensed land surveyor to identify it.

This becomes especially important when you're planning to build close to a required setback.

If you need to maintain a five-foot setback, being wrong about the property line by six feet creates a rather significant math problem.

Will the County Verify My Setbacks When I Build?

Setbacks aren't merely theoretical lines on a zoning chart.

During the County's building inspection process, measurements from building forms to property lines are checked to verify that approved setbacks are maintained.

The County may also require setback certification in appropriate circumstances.

In other words:

“I thought the property line was over there”

isn't a particularly useful construction strategy.

Do I Need a Survey Before Building?

Not every project automatically requires the same survey work.

But San Bernardino County can require survey information when property boundaries need to be established for the proposed construction.

If you're building anywhere close to a setback, a survey can become particularly important.

The closer you build to the minimum allowable distance, the less room you have for boundary error.

That's why the question:

“How close CAN I build?”

is sometimes less useful than:

“How close SHOULD I build?”

Just because zoning might allow you to build five feet from a property line doesn't necessarily mean five feet is the best design decision.

Can My Neighbor's Fence Tell Me Where the Property Line Is?

No.

Please don't use a fence as your land surveyor.

Fences can be:

• Inside a property line
• Outside a property line
• Built based on an old assumption
• Built around terrain
• Built around existing improvements
• Wrong

The same applies to:

• Roads
• Driveways
• Utility poles
• Landscaping
• Old sheds
• Rock piles
• Somebody's collection of tires

The desert has accumulated a lot of stuff over the years.

Stuff isn't a boundary survey.

Does a Small Shed Have to Meet Setbacks?

Yes.

This is a particularly useful thing to know.

San Bernardino County currently allows certain one-story detached tool sheds, storage sheds, playhouses and similar structures of up to 120 square feet without a building permit when they meet applicable requirements.

But:

No building permit doesn't mean no setback.

The County specifically states that qualifying permit-exempt accessory structures still need to remain within the minimum required setbacks.

That's an important distinction.

Permit exempt ≠ zoning exempt.

What About a Garage or Workshop?

Garages, barns, workshops and other accessory structures can have additional standards.

San Bernardino County's general residential development table directs accessory structures to the County's separate accessory-structure regulations.

So don't automatically use the primary-house setback to position every other structure on the property.

The answer can depend on:

• Structure type
• Structure height
• Location
• Primary use
• Zoning
• Other applicable development standards

If you're planning a house, detached garage, workshop, barn and ADU, investigate the layout as a complete project.

Can an ADU Be Closer to the Property Line?

Potentially, yes.

ADUs are subject to specific California and San Bernardino County development standards that can differ from the ordinary setbacks applicable to a primary residence.

That's why you shouldn't automatically apply the setback from your primary house to a proposed ADU.

Likewise, don't assume that because an ADU may qualify for a reduced setback, your garage or primary residence receives the same treatment.

Different structure. Different rules.

What About Septic?

This is where High Desert land starts becoming a puzzle.

Your house has setbacks.

Your septic system has requirements.

Your leach field needs appropriate placement.

Your replacement area may need to remain available.

Your well, if applicable, needs appropriate separation.

Your property boundaries exist.

Your driveway needs somewhere to go.

Maybe there are Joshua trees.

Maybe there's drainage.

Maybe there's an easement.

And somehow you're supposed to fit everything on one parcel.

This is why I keep saying:

Don't price the dirt. Price the project.

A parcel may technically have enough acreage to build.

The real question is whether everything required for your project can fit together economically and legally.

What If I Have Five Acres?

Five acres gives you substantially more room than a conventional residential lot.

But acreage doesn't eliminate setbacks.

A five-acre RL parcel still has property boundaries and development standards.

Usually, the setbacks themselves won't consume a huge percentage of five acres.

But other constraints might.

For example, imagine that your five acres has:

• A drainage area through one side
• A utility easement across another
• A steep slope at the rear
• Joshua trees in the center
• A septic system and replacement area
• A driveway entering from the road

Now the question isn't:

“How much land do I own?”

It's:

“Where can I actually put everything?”

That's the question that matters.

What If I Have a Very Narrow Lot?

Now setbacks can become extremely important.

The same setback that barely matters on five acres can dramatically affect a narrow parcel.

That's why buyers should pay attention not only to:

lot area

but also:

lot dimensions.

Two parcels can contain exactly the same number of square feet and have very different development potential because they're shaped differently.

A nice rectangle and a long desert spaghetti noodle are not necessarily equivalent building sites.

Can I Get a Setback Exception?

San Bernardino County's Development Code contains provisions addressing setback exceptions, reductions and allowed encroachments in certain circumstances.

But don't buy a property assuming you'll receive one.

If your project only works if the County lets you build closer than the ordinary setback:

Investigate that before purchasing.

A possible exception shouldn't become the foundation of your entire investment strategy unless you've determined that your project actually qualifies.

Do Setbacks Apply if I Don't Need a Building Permit?

Yes.

This is worth repeating because it's easy to misunderstand.

San Bernardino County expressly states that all building setbacks must be maintained whether or not a building permit is required.

So:

“I don't need a permit.”

does not mean:

“I can put it wherever I want.”

Those are two completely different questions.

How Can I Find the Setbacks for a Particular Parcel?

Start by identifying the exact zoning designation.

Then review the applicable San Bernardino County development standards.

But if you're planning an actual construction project, the County recommends contacting Land Use Services to determine the setbacks applicable to the specific property.

County staff can consider:

• Proposed structure type
• Zoning
• Overlays
• Subdivision requirements
• Composite development plans
• Other property-specific factors

That's much better than relying on a generic internet answer.

Including mine.

Before Buying Land, Ask More Than “Can I Build?”

Ask:

Where can I build?

That's a much better question.

Before purchasing a vacant parcel for development, investigate:

• Exact zoning
• Required front setback
• Required rear setback
• Interior-side setbacks
• Street-side setbacks
• Lot dimensions
• Easements
• Survey/boundary issues
• Septic placement
• Well placement
• Fire access
• Drainage
• Utilities
• Protected plants
• Other site constraints

Then start thinking about where your project fits.

Found a Parcel You're Considering?

Send me the APN or listing link.

Tell me what you want to build.

A house?

Manufactured home?

ADU?

Garage?

Workshop?

Barn?

Maybe all of the above?

Then we can identify the questions you'll want answered before deciding whether the property actually has enough usable space for the project you have in mind.

Because:

Owning five acres doesn't mean you can build on every square foot of five acres.

And:

The property line tells you what you own.

The setback helps tell you where you can build.

Looking for High Desert Land?

Tell me what you want to do with the property—not merely how many acres you want.

A national real estate website can show you what's listed.

I can help you understand the landscape.

Dawn Anderson is a California real estate broker serving buyers and sellers in the High Desert. This information is provided for general educational purposes and is not legal, planning, zoning, surveying, engineering, building, environmental, wastewater or permitting advice. San Bernardino County setback and development requirements can change and may vary based on zoning, structure type, overlays, subdivisions, easements and parcel-specific conditions. Buyers and property owners should independently verify current setback requirements and their proposed project with San Bernardino County Land Use Services and appropriately qualified professionals before purchasing, designing or developing property.