Build a Garage on Vacant Land Before I Build a House?

You found five acres in the California High Desert.

Your long-term plan is to build a house.

But you're not ready for the house yet.

So you're thinking:

“I'll build the garage or workshop first. I can store my tools, vehicles and building materials there, and then I'll build the house later.”

That sounds reasonable.

But if the property is in unincorporated San Bernardino County, there's an important land-use rule you need to understand before buying the property:

A residential garage or workshop is generally considered an accessory structure.

And an accessory structure is normally supposed to exist in conjunction with a legally established primary structure or primary use.

So can you build the garage first?

Potentially—but don't assume you can simply build an accessory garage or workshop on otherwise vacant residential land.

San Bernardino County states that where the primary use has not yet been established, an accessory structure may only be built subject to issuance of a Temporary Use Permit.

That's a very different answer from:

“Sure. It's your land.”

Why Can't I Just Build the Garage First?

Because of one important word:

Accessory.

San Bernardino County defines residential accessory structures to include things such as:

• Garages
• Workshops
• Storage sheds
• Studios
• Gazebos
• Greenhouses
• Swimming pools
• Other structures customarily incidental to a residence

The concept is pretty straightforward.

A residential garage is normally accessory to a residence.

A residential workshop is normally accessory to a primary residential use.

If there isn't yet a legally established primary structure or use, the County doesn't simply pretend one exists because you're planning to build it someday.

What Does San Bernardino County Actually Say?

The County's Development Code provides that an accessory structure or use shall exist in conjunction with a legally established primary structure or primary use under the same common ownership.

It further states that:

Where the primary use has not yet been established, an accessory structure may only be built subject to issuance of a Temporary Use Permit.

That's the sentence vacant-land buyers need to know.

Because I've heard versions of this plan many times:

“I'll buy the land now.”

“I'll build the shop next year.”

“Then I'll build the house when I retire.”

Maybe.

But investigate the sequence before purchasing.

Does That Mean I Can Never Build a Garage Before the House?

Not necessarily.

The County specifically provides a mechanism for situations where the primary use hasn't yet been established:

Temporary Use Permit.

Whether your particular project qualifies, what conditions apply, and how the garage or workshop relates to the future primary development are questions to discuss with San Bernardino County Land Use Services before you start designing or purchasing buildings.

The important point is:

Don't assume the garage can automatically become Phase One simply because the house is Phase Two.

The sequence matters.

What Is a Temporary Use Permit?

A Temporary Use Permit, commonly called a TUP, is a County approval used for qualifying temporary structures and uses.

In the accessory-structure situation, it's the mechanism specifically referenced by the Development Code when someone wants to construct an accessory structure before the primary use has been established.

That does not mean every proposed garage-first project will automatically be approved.

It means:

There is a process you need to investigate.

If your entire land-purchase plan depends on building the garage first, contact the County before buying and explain exactly what you're proposing.

What If I'm Going to Build the House at the Same Time?

That's a different situation.

If the garage is being permitted and constructed as part of an overall residential project, you're establishing the primary residential use rather than simply putting a standalone accessory building on otherwise vacant land indefinitely.

For example:

House + attached garage

is clearly different from:

Vacant five acres + detached 2,500-square-foot workshop + maybe a house someday.

And that's why telling Planning your entire project is so important.

Don't ask:

“Are workshops allowed?”

when your actual plan is:

“I want to buy five vacant acres, build a large workshop first, store vehicles and equipment there, and build a residence five or ten years from now.”

Those are different questions.

Can I Build a Workshop Instead?

Calling it a workshop instead of a garage doesn't necessarily solve the issue.

San Bernardino County specifically includes workshops within its definition of residential accessory structures.

So:

“It's not a garage. It's my workshop.”

isn't a magical zoning spell.

If the proposed workshop is accessory to a future residence, the same basic primary-use issue can arise.

What If It's a Really Big Workshop?

Now we need even more information.

The larger and more intensive the proposed structure or use, the more important it becomes to determine exactly how the County classifies your project.

A buyer might say:

“I just want a shop.”

That could mean:

600-square-foot hobby workshop

or:

6,000-square-foot metal building where I intend to restore cars, store heavy equipment and operate a business.

Those aren't necessarily the same land-use question.

Size, zoning, intended use, building design, utilities and commercial activity can all matter.

Don't describe your project using the smallest possible word.

Tell the County what you're actually planning.

Can I Run a Business From the Workshop?

Don't automatically assume that because a workshop can be built, any business can be operated from it.

Residential zoning and home-occupation rules can regulate business activities separately.

There's a substantial difference between:

building furniture for yourself on weekends

and:

operating a commercial cabinet shop with employees, customer traffic and delivery trucks.

The building itself and the activity inside the building are separate questions.

If your land purchase depends on operating a business from the property, investigate both.

What If I Want a Garage for My RV?

Again, tell the County what you're actually proposing.

An RV garage associated with a residence may potentially be treated as a residential accessory structure.

But don't assume:

“I own an RV, therefore I can build an RV garage on vacant residential land before I have a residence.”

The vehicle doesn't establish the primary residential use.

And building an RV garage doesn't necessarily give you permission to live in the RV inside it.

Those are separate issues.

Can I Live in the Garage Until the House Is Built?

This is where plans can go sideways quickly.

A garage or workshop is not automatically a legal dwelling.

Building codes and land-use regulations distinguish between residential living space and structures intended for vehicle storage, workshops and other accessory purposes.

So don't create a plan that goes:

Step 1: Build garage.

Step 2: Put bed and refrigerator in garage.

Step 3: Congratulations, house.

That's not how legal occupancy works.

If you want temporary living arrangements while constructing your residence, investigate the County rules specifically applicable to temporary occupancy during construction.

Can I Put a Bathroom in My Workshop?

Potentially, depending on the permitted project, but adding plumbing introduces additional considerations.

Now we're potentially talking about:

• Water supply
• Wastewater
• Septic capacity
• Plumbing permits
• Building requirements
• Intended use of the structure

And once buyers start adding:

bathroom + shower + kitchenette + sleeping area

the question starts changing from:

“Can I build a workshop?”

to:

“What exactly am I building?”

That's a question the County is also likely to ask.

What About a Metal Building?

The construction material doesn't eliminate the land-use rules.

Whether your proposed building is:

• Wood framed
• Steel
• Prefabricated
• Pole-barn style
• Metal shop
• Another construction system

you still need to determine what the structure is legally being used for and what permits and development standards apply.

Metal building describes construction.

It doesn't necessarily describe land use.

Can I Put Up a Small Shed Before Building the House?

Be careful here too.

San Bernardino County says certain one-story detached tool sheds, storage sheds, playhouses and similar structures of up to 120 square feet may be exempt from a building permit when they satisfy applicable requirements.

But there's an important distinction:

Building-permit exempt does not mean zoning exempt.

The County's accessory-structure rule still says an accessory structure is supposed to exist with a legally established primary structure or primary use.

The County also requires applicable setbacks to be maintained whether or not a building permit is required.

So don't assume:

“It's under 120 square feet, therefore I can put it anywhere on vacant land.”

The 120-square-foot rule addresses whether a qualifying structure needs a building permit.

It doesn't erase land-use requirements.

Do Garages and Workshops Require Building Permits?

Generally, yes.

San Bernardino County specifically lists carports, garages and barns among structures requiring permits and inspections.

The County also identifies new detached buildings and detached accessory structures greater than 120 square feet among projects requiring permits.

Depending on the project, additional permits or reviews may also be necessary for:

• Electrical
• Plumbing
• Mechanical systems
• Grading
• Septic
• Other site improvements

Don't order the giant metal building first and investigate permits after the truck arrives.

What About Setbacks?

Your garage or workshop also has to comply with applicable development standards.

Those can depend on:

• Zoning
• Structure type
• Structure height
• Location on the property
• Lot configuration
• Other applicable County requirements

This is where our earlier question becomes important:

How close can I build to my property line?

The answer for an accessory structure isn't necessarily identical to the answer for your primary residence.

So before choosing the perfect corner of the property for your shop, determine the applicable setback.

What About Easements?

This is another reason not to start construction planning from an online parcel map.

You may have:

• Utility easements
• Access easements
• Drainage easements
• Road easements
• Other recorded rights

affecting the location where you want to build.

A five-acre parcel may look enormous until you start overlaying:

setbacks + easements + septic + driveway + drainage + future house + garage.

Then suddenly you're playing desert Tetris.

Think About the Future House Before You Place the Garage

This is probably the practical advice I'd emphasize most.

Even if the County allows you to construct your garage or workshop before the house through the appropriate approval process, think carefully about where you put it.

The shop you build today can affect:

• Where the future house fits
• Your views
• Driveway layout
• Septic placement
• Utility routing
• Fire access
• ADU placement
• Outdoor living space
• Future subdivision plans

Don't place a building simply because:

“There's a nice flat spot right there.”

That nice flat spot may also be exactly where your future house should go.

What If I Want to Build the Garage Now and the House in 10 Years?

This is precisely the kind of plan I would investigate before purchasing the land.

Ten years isn't:

“We're building the house right behind it.”

It's a long-term land-use strategy.

Ask the County how your proposed accessory structure would be treated during that period and what approval would be necessary.

Don't build your financial plan around:

“They'll probably let me.”

“Probably” is an expensive word when you're buying land and constructing buildings.

Does My Zoning Matter?

Absolutely.

Your zoning determines the land uses permitted on the property and provides development standards that affect your project.

That's why understanding whether your property is:

RL — Rural Living

RS — Single Residential

RC — Resource Conservation

or another zoning designation matters.

A workshop associated with a rural residence is one thing.

A commercial or industrial operation is another.

If your real goal is:

“I need land where I can build a giant shop and operate my business,”

tell me that before we start looking at parcels.

That's far more useful than:

“I want five acres.”

What Should I Ask Before Buying Vacant Land for a Workshop?

Start with your actual plan.

For example:

“I want approximately five acres. I want to build a 2,000-square-foot detached workshop first. I eventually plan to build a 1,800-square-foot house. I need power for the shop, I want a bathroom in it, and I expect to build the house about three years later.”

Now we have something useful to investigate.

Before purchasing, determine:

• Whether the zoning accommodates your intended uses
• Whether the accessory structure can precede the primary use
• Whether a Temporary Use Permit would be required
• What building permits are required
• Applicable setbacks
• Water availability
• Wastewater requirements
• Electrical availability and cost
• Legal and physical access
• Grading requirements
• Fire access
• Easements
• Future house placement
• Future ADU or other accessory-development plans

That's how you buy land for a project.

Don't Buy the Dirt and Hope the Sequence Works

This is really the entire lesson.

There's nothing unusual about wanting to build in stages.

Land is expensive.

Construction is expensive.

People have budgets.

A buyer may very reasonably want to:

Buy land → build garage/workshop → build house later.

But the fact that the sequence makes financial sense to you doesn't automatically mean it works under the applicable land-use rules.

Investigate the sequence before buying.

Because the worst time to discover that your Phase One isn't permitted the way you expected is:

after you've already purchased the property.

Considering Land for a Garage or Workshop?

Tell me what you actually want to build.

Not just:

“I want some land.”

Tell me:

• How large is the garage or workshop?
• What will you use it for?
• Do you need electricity?
• Do you need plumbing?
• Will you operate a business?
• Will you store an RV?
• When do you plan to build the house?
• What else do you eventually want on the property?

Those details help determine what kind of land you should be looking for.

The right acreage with the wrong zoning or development sequence can still be the wrong property.

Looking for High Desert Land?

Tell me what you want the property to do for you.

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, building, engineering, environmental, wastewater, business-licensing or permitting advice. San Bernardino County development standards and permit requirements can change and may vary based on zoning, structure type, proposed use and parcel-specific conditions. Buyers and property owners should independently verify their proposed construction sequence and project with San Bernardino County Land Use Services and appropriately qualified professionals before purchasing or developing property.