How to Evaluate a Property for Development Potential

What Real Estate Investors and Property Owners Should Look for Before Assuming They Know What a Property Is Worth

When most people evaluate a property, they look at what is already there.

A house. A garage. An apartment building. A vacant lot. A struggling commercial building.

They look at the sale price, comparable properties, rents, condition, and maybe the zoning.

Those things matter. But if you are buying property with investment or development in mind, there is another question that can be far more important:

What could legally and realistically exist here that does not exist today?

That is development potential.

And in California, where state housing laws have changed dramatically, development potential is increasingly easy to miss if you evaluate a property based only on its current use or the basic zoning designation.

The best opportunities are often properties where the next buyer sees something the current owner - and sometimes even the listing agent - does not.

Start With the Property, Not the Idea

One of the easiest ways to waste money in development is to decide what you want to build before determining what the property can support.

Someone sees a large backyard and decides they want three additional units.

Someone buys acreage assuming they can subdivide it.

Someone purchases an old garage planning to convert it into an ADU.

Someone buys a commercial property assuming it can become apartments.

Sometimes those ideas work.

Sometimes one constraint changes the entire project.

A better approach is to start with the property and ask:

What opportunities does this particular site give me?

Zoning Is the Beginning - Not the End

The zoning designation is still one of the first things to investigate.

You want to know what uses are allowed, what density applies, and what development standards normally govern the property.

But California investors should not stop there.

State housing laws can create development rights that are not obvious from the local zoning map. Depending on the site, those rights may involve ADUs, SB 9, Density Bonus, streamlined housing approvals, affordable housing incentives, or residential development on certain commercial properties.

The question is not simply:

What is this property zoned?

It is:

What can actually be approved here under local and state law?

Look at the Existing Improvements

Existing buildings can create opportunities that vacant land does not.

When I evaluate a property, I want to know what is already there and whether those improvements are legal.

The primary residence.

Garages.

Carports.

Barns.

Workshops.

Guesthouses.

Storage buildings.

Existing second units.

Commercial buildings.

Other accessory structures.

An existing garage may have ADU conversion potential.

An apartment building may contain non-livable space that could potentially be converted into additional units.

An older second dwelling may have a legalization pathway.

An underused commercial building may sit on property with residential potential.

Existing improvements should not simply be viewed as what you are buying today. They should be evaluated for what they might become.

Then Check the Permit History

Never assume that because a building exists, it is legal.

And never assume that because something does not appear immediately in an online permit search, it was necessarily built illegally.

Older records can be incomplete, archived, filed under different parcel numbers, or stored outside modern online systems.

The goal is to establish as much as possible about:

What was originally permitted.

What additions were permitted.

What the legal use of each structure is.

Whether bedrooms or dwelling units were added.

Whether a garage or accessory building was converted.

Whether there are open permits or unresolved code issues.

An unpermitted structure can be a serious liability.

It can also sometimes be a development opportunity.

You need to know which one you are dealing with before you buy.

Find the Building Envelope

The parcel is the entire legal lot. The building envelope is the portion of that parcel where development can actually fit after setbacks and other site constraints are applied.

That distinction matters because a parcel can technically allow housing while having much less usable building area than the parcel size suggests.

Depending on the property, the usable building envelope may be affected by:

Front, side, and rear setbacks.

Easements.

Lot coverage.

Floor Area Ratio (FAR).

Height limits.

Open-space requirements.

Parking requirements.

Creeks and riparian setbacks.

Topography.

Fire access.

Other objective development standards.

A simple statement such as 'the zoning allows four units' is not enough.

You still have to determine whether those units can physically fit within the building envelope and satisfy the other standards that apply.

Look for State-Law Opportunities

This is where California property analysis has changed dramatically.

Depending on the property, state law may create opportunities beyond conventional local zoning.

Examples include:

An ADU or JADU.

Multiple ADUs on qualifying multifamily property.

An SB 9 two-unit development.

An SB 9 Urban Lot Split.

Density Bonus development.

Ministerial or streamlined housing approval.

Affordable-housing incentives.

Housing on certain commercially zoned properties.

Not every property qualifies.

But investors who do not check these pathways may be evaluating a property using an outdated set of assumptions.

SB 9: Four Units Means Four Units

SB 9 is particularly easy to misunderstand, and I have heard people incorrectly describe it as creating eight or even twelve units by stacking primary residences, ADUs, and JADUs.

That is not what SB 9 requires.

For a qualifying SB 9 Urban Lot Split, the original parcel can be divided into two parcels. State law requires the local agency to allow up to two units on each resulting parcel.

Those units can be different combinations of primary residences, ADUs, and JADUs. For example, each resulting parcel could potentially contain two primary residences, giving you four full primary residences total across the original lot area.

Another configuration could include primary residences and accessory units.

But under the SB 9 framework, the important number is:

Four units total - not four primary residences plus an ADU and JADU for each residence.

On an SB 9 lot split, primary units, ADUs, and JADUs all count toward the two-unit limit on each resulting parcel. A local jurisdiction may choose to allow more, but SB 9 itself does not require eight or twelve units.

Without a lot split, SB 9 can also be combined with ADU/JADU law to reach up to four units in qualifying circumstances.

For investors, this distinction matters enormously. 'Four units under SB 9' should not be interpreted as four units that each independently generate another right to add accessory units.

Infrastructure Can Make or Break the Deal

Legal development rights are only half of feasibility.

The property also has to support the project.

Investigate infrastructure early.

Depending on the site, that may mean:

Public sewer capacity.

Septic capacity.

Public water service.

Private wells.

Electrical service.

Gas service.

Road access.

Fire access.

Storm drainage.

Utility easements.

A property may have the legal right to another dwelling but need a major electrical-service upgrade.

A rural property may have enough acreage for additional housing but no suitable septic area.

A development may be allowed at a certain density but require expensive water or sewer improvements.

The development right has value only if you understand what it will cost to use it.

Rural Property Requires Another Layer of Analysis

Acreage is one of the easiest things for investors to overvalue.

Twenty acres sounds like enormous development potential.

It may be.

Or much of the property may be constrained by:

Septic limitations.

Private-well capacity.

Wildland fire requirements and defensible space.

Emergency access and private-road requirements.

Water storage and fire-flow requirements.

Streams, wetlands, and riparian areas.

Sensitive habitat or endangered species.

Biological surveys and seasonal survey requirements.

Archaeological and cultural resources.

Tribal consultation or cultural-resource review.

Agricultural restrictions.

Conservation easements.

Timberland or forest-related regulations.

On rural land, the question is rarely just how many acres you own.

It is how much of that land can actually support the development you are considering.

A Flood Zone Is a Constraint - Not Automatically a No

Flood hazards are a good example of why feasibility analysis should identify constraints without automatically treating every constraint as fatal.

A property in a flood zone may still be developable.

Depending on the flood zone, site conditions, and local floodplain regulations, a project may be able to use an elevated foundation, engineered fill or grading, or another flood-resistant design strategy to place the required floor elevation above the applicable flood elevation.

California's Department of Water Resources specifically recognizes properly designed and compacted fill as one method that can be used to raise ground above flood elevation in appropriate Zone A/AE situations.

But this is not universal. Fill can create drainage problems, floodways are substantially more restrictive, and local communities can adopt standards that are stricter than the federal minimum.

The right question is therefore not simply:

Is the property in a floodplain?

It is:

What does the flood designation require, and can the project be designed to comply with it?

Access and Easements Matter More Than People Think

A parcel can have a beautiful building site and still have a major access problem.

You need to understand:

How the property legally reaches a public road.

Whether access is owned or easement-based.

Who maintains a private road.

Whether the easement is wide enough for the proposed use.

Whether emergency vehicles can reach the building site.

Whether utilities have the easements they need.

Whether existing easements cross the best building area.

These are not glamorous questions.

They are the questions that can determine whether a development concept works.

Environmental Constraints Can Change the Entire Project

Environmental constraints should not automatically be translated into 'you cannot build.'

A creek, wetland, protected tree, sensitive habitat, endangered species, archaeological site, or cultural resource may affect where development can occur or what studies and mitigation are required.

Sometimes the answer is moving the building.

Sometimes it is maintaining a required setback.

Sometimes it is completing a biological or archaeological study.

Sometimes a seasonal survey means the project schedule itself needs to change.

And sometimes a constraint really does make the proposed development infeasible.

The point of early analysis is to determine which situation you have before you spend heavily on design.

Do Not Forget the Economics

A project can be legally possible and still be a terrible investment.

Once you identify the development opportunity, you still need to ask what it costs to capture it.

That includes:

Design and engineering.

Permit and impact fees.

Utility upgrades.

Road or driveway improvements.

Septic or sewer work.

Water improvements.

Grading and flood-elevation work where applicable.

Retaining walls.

Environmental studies.

Financing and holding costs.

Construction.

Then compare those costs with the value created.

A $300,000 development opportunity that costs $400,000 to unlock is not an opportunity.

The point of feasibility work is not to prove that something can be built.

It is to determine whether building it makes sense.

Look for What Other Buyers Miss

This is where development knowledge creates an advantage.

One buyer sees a house with a detached garage.

Another sees a house plus a potential rental unit.

One buyer sees an aging apartment building.

Another sees unused space and possible additional ADUs.

One buyer sees an oversized single-family lot.

Another investigates whether SB 9 could potentially create two legal parcels and four primary residences total.

One buyer sees a tired commercial property.

Another asks whether state law creates residential potential.

One buyer sees a flood-zone designation and walks away.

Another investigates whether elevation, grading, engineered fill, or another compliant design approach could make the site workable.

The property did not change.

The information did.

And information can change value.

A Simple First-Pass Development Checklist

Before getting emotionally or financially committed to a property, I would want answers to at least these questions:

What is the zoning and General Plan designation?

What residential uses are allowed?

Do any state housing laws create additional development rights?

Could SB 9 apply, and if so, is the opportunity two units, a lot split, or both?

What structures legally exist on the property?

What does the permit history show?

What is the actual building envelope?

What are the setbacks, height, lot coverage, FAR, and parking rules?

Are there easements affecting development?

Is sewer available?

If not, what is the septic capacity?

Is adequate water available?

Is the electrical service adequate?

Does the property have compliant access?

Are there wildfire constraints?

Is the property in a flood zone or floodway, and can the project be designed around those requirements?

Are there streams, wetlands, habitat, endangered species, archaeological, tribal cultural, or other environmental issues?

What outside agencies may have jurisdiction?

What would the infrastructure improvements cost?

What is the likely permitting path?

What value would the additional development create?

You do not necessarily need every answer before making an offer.

But the more expensive the property - and the more your investment thesis depends on future development - the more dangerous it is to buy without understanding them.

Common Mistakes

'The listing says it is developable.'

That is not a feasibility analysis.

'The zoning allows it.'

Maybe. Now determine whether the building envelope, infrastructure, site constraints, and current state law support the project.

'SB 9 means I can split the lot, build four houses, and then add ADUs and JADUs to get eight or twelve units.'

No. SB 9 requires a maximum of four units under its framework. On an Urban Lot Split, all primary residences, ADUs, and JADUs count toward the two-unit-per-resulting-parcel limit. Four primary residences can potentially be the four units, but they do not become a base for stacking additional SB 9 units.

'There is already a second unit, so it must be legal.'

Not necessarily. Verify the permit history and legal use.

'It is in a floodplain, so I cannot build there.'

Not necessarily. The flood zone, required elevation, floodway status, local ordinance, drainage impacts, and available design solutions all matter.

'It has plenty of acreage.'

Acreage does not equal buildability.

'The city told the owner years ago that they couldn't do it.'

That answer may have been correct then and wrong now. California housing law has changed repeatedly.

'If it can be permitted, it must be a good investment.'

No. Permitting feasibility and financial feasibility are two different questions.

Why This Matters

Real estate investors make money when they understand value that the market has not fully recognized.

Sometimes that value comes from renovation.

Sometimes it comes from better management.

Sometimes it comes from changing the use.

And sometimes it comes from understanding development rights and site solutions that other buyers never investigated.

California's changing housing laws make that last category especially important.

You do not need to develop every property you buy.

But you should understand the development potential you are buying - because it may influence what the property is worth, how you use it, how you finance it, and how you eventually sell it.

The Bottom Line

Do not evaluate a development property based only on what is standing there today.

Look at:

The zoning.

State housing law.

Existing structures.

Permit history.

The building envelope.

Infrastructure.

Access and easements.

Flood requirements.

Wildfire requirements.

Environmental and cultural-resource constraints.

Outside agencies.

Construction economics.

Then ask the question that matters:

What can this property realistically become?

That is where hidden development potential lives.

And finding it before everyone else does can be the difference between buying an ordinary property and buying an opportunity.

Looking Ahead

In the next article, we'll look at The Zoning Map Is Only the Beginning and explain why the zoning designation is just one layer of a California property's development potential.

If you're evaluating a property before purchase, planning an ADU or additional units, or trying to understand what development rights a site may have, Buchanan Land Use Consulting can help evaluate the permitting path, identify constraints, and uncover opportunities before you commit significant money to a project.

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Next: The Zoning Map Is Only the Beginning