How to Qualify a Multifamily ADU Lead in California Before You Quote the Project

A property owner tells you they have a ten-unit apartment building and want to add eight ADUs. They have already read about California's multifamily ADU rules, they believe there is room on the property, and they want to know what your firm would charge to handle the permitting.

You can learn quite a bit from that first explanation, but there are still several things you would want to establish before attaching a price to the project. The existing unit count needs to be confirmed. You need to understand whether the owner is talking about detached construction, conversions inside the existing building, or some combination of the two. The property itself needs to be reviewed, along with whatever work has already been done by architects, engineers, surveyors, contractors, or previous consultants.

California's current ADU rules create meaningful opportunities on multifamily properties.

An existing multifamily site can qualify for as many as 8 detached ADUs under Government Code section 66323, subject to the number of existing units on the lot.

Existing multifamily buildings can also qualify for conversion ADUs within certain non-livable areas. The California Department of Housing and Community Development's March 2026 ADU Handbook explains both pathways in detail.

Those rules are useful during qualification because they tell you what may be legally available. They still leave plenty of project-specific work to do before you understand what the owner wants, what the property can support, and what your company is actually being asked to provide.

This article covers the sales and intake side of that process. For single-family properties, including JADUs, see our single-family ADU and JADU qualification guide.

What Counts as a Multifamily Property Under California ADU Law?

The property description is worth confirming before getting into unit counts.

For State ADU Law, HCD defines a multifamily dwelling structure as a structure containing two or more attached dwelling units on a single lot. Several detached single-family homes located on the same parcel are not automatically considered a multifamily dwelling structure for these provisions.

That can create confusion during intake because property owners may use "multifamily" more broadly. A real-estate listing may describe the property one way, while the permit history or legal configuration tells a more complicated story.

If the proposed ADU strategy depends on the multifamily provisions of Government Code section 66323, confirm the property classification instead of relying on the caller's description alone.

JADUs should also come out of the conversation here. HCD's current guidance states that JADUs are limited to sites with a proposed or existing single-family dwelling and cannot be created on a multifamily site.

For this type of lead, the discussion is about ADUs.

Get the Address and Confirm What Legally Exists

The address should come early in the conversation because most of the useful qualification work starts there.

Once you know the property, you can identify the jurisdiction and begin reviewing the records that are reasonably available. Depending on the city or county, that may include permit history, assessor information, previous plans, GIS information, certificates or other records that help establish the current property configuration.

The number of legally existing units deserves particular attention because it can affect the detached ADU allowance.

Under section 66323, an existing multifamily property can qualify for up to eight detached ADUs, but the number of detached ADUs cannot exceed the number of existing units on the lot. HCD's current handbook gives the same interpretation.

Existing units on the multifamily property	Detached ADUs potentially available under §66323
2	Up to 2
4	Up to 4
6	Up to 6
8 or more	Up to 8

This table describes the state-law ceiling for that particular pathway. It does not tell you how many units will fit on a specific property.

That distinction is useful when an owner calls after reading about the eight-unit rule. If the property is actually a fourplex, section 66323 does not give that owner eight detached ADUs simply because eight is the statewide maximum for qualifying existing multifamily properties.

You also want some confidence in the existing unit count itself. If someone describes the building as a sixplex but the available records suggest a different legal configuration, that question should be resolved before the project is priced around six existing units.

Existing and Proposed Multifamily Properties Follow Different Rules

The next issue is whether the multifamily building already exists.

For an existing multifamily dwelling, section 66323 allows up to eight detached ADUs, subject to the existing-unit cap.

For a lot with a proposed multifamily dwelling, the same section provides for up to two detached ADUs.

A developer preparing a new apartment project therefore has a different ADU conversation from an owner looking at unused portions of an existing twenty-year-old apartment property.

This information should surface early because it affects how you interpret the owner's expectations. If they have been researching the eight-unit rule but are actually planning a new multifamily development, the qualification call should correct that assumption before the proposal is built around it.

Understand Which ADU Path the Owner Is Considering

Once the property type and existing unit count are reasonably clear, find out what the owner actually has in mind.

California's multifamily rules allow more than one type of ADU project, and those paths can create very different scopes for the professionals involved.

Detached ADUs

For existing multifamily properties, the detached pathway is the one behind the widely discussed "up to eight ADUs" rule.

The exact allowable number depends on the existing unit count, and the ADUs must be detached from the primary multifamily structure. HCD also clarifies an interesting point that is easy to miss: those ADUs do not have to be detached from one another or from other accessory structures on the lot.

That gives the design team more than one potential way to organize the new units, but the sales conversation still needs to establish what the owner is considering.

Maybe they have open land behind the building. Maybe they are looking at an existing parking area. Maybe they are picturing several units arranged together in a new detached structure. At this stage, you are trying to understand the direction of the project well enough to determine what research and professional work still needs to happen.

Conversion ADUs

Existing multifamily buildings also have a conversion pathway.

Government Code section 66323 allows ADUs to be created within portions of an existing multifamily structure that are not used as livable space. HCD identifies examples including storage rooms, boiler rooms, passageways, attics, basements and garages. At least one conversion ADU must be allowed, with the potential for up to 25 percent of the existing multifamily unit count under the conditions in the statute.

That introduces a different set of questions because the project is now tied to an existing building interior rather than only to available land around it.

You may need plans or measurements of the space. The owner may already know that a garage or storage area is underused, but that does not tell you whether anyone has evaluated the area for a dwelling conversion or what building work would be required.

More Than One Path May Apply

The current law allows the section 66323 categories to be combined. HCD also explains that, in addition to the units available under section 66323, a local agency must allow at least one ADU described under section 66314, which follows a separate set of standards.

This is one of the reasons multifamily ADU qualification can become confusing when someone tries to calculate the entire project from a short phone call.

Several statutory pathways may be relevant, but the salesperson does not need to turn the first conversation into a legal arithmetic exercise. The useful next step is to identify the pathways worth investigating on the actual property and make sure the proposal covers the work required to do that.

Translate the Owner's Unit Count Into an Actual Project

Owners often arrive with a number before they arrive with a scope.

Someone may say they want six ADUs because their building has six existing units.

Another owner may simply ask for "the maximum." That tells you something about their objective, but there are still many ways the project could develop.

Ask where they expect the units to go and whether anyone has already studied the property. Find out whether they are thinking about detached construction, existing building space, or both. If they have sketches, feasibility work, plans, surveys, correspondence with the jurisdiction, or previous consultant work, those materials can quickly show how developed the idea already is.

The number matters, but the proposal needs to describe actual professional work.

A firm being hired to process permits for four fully designed detached ADUs has a different assignment from a firm being asked to determine how many units a property can accommodate and then coordinate the design and permit process.

Both callers may initially ask the same question about price.

Review the Property Before Pricing Around the State Maximum

A property can have a strong legal ADU allowance and still require substantial work before anyone knows how the units should be arranged.

For detached ADUs, look at the overall site and what occupies it today. The location of the multifamily building, existing garages, accessory structures, driveways, parking areas, open space and other improvements all help explain what the owner is proposing.

Available records and aerial imagery are useful during early intake. When precise property boundaries, easements or site dimensions become important to the project, professional survey information may be necessary rather than relying on online mapping alone.

Parking is a good example of why the legal rules and site review should be considered together.

Current California law prevents local agencies from requiring replacement of off-street parking spaces when a garage, carport, covered parking structure or uncovered parking space is demolished in conjunction with ADU construction or converted to an ADU. Section 66323 units are also exempt from local parking requirements.

An owner may therefore see an existing parking area as an obvious ADU location. It may turn out to be a good location, but the parking rule alone does not resolve site planning, access, building-code, utility, drainage, fire-safety or other project conditions.

Those questions belong in the feasibility and design work, and the sales process should recognize when that work is still outstanding.

Find Out How Existing Conversion Space Is Being Used

Conversion ADUs deserve some additional intake questions because "non-livable" does not necessarily mean "unused."

A storage room may be assigned to tenants. A garage may provide parking that the owner still relies on operationally. Mechanical equipment can occupy areas that look open on a basic floor plan. A leasing office may be actively used by property management.

HCD's current handbook specifically says that a leasing office within an existing multifamily dwelling structure can qualify for conversion under the multifamily provisions if the applicable requirements are satisfied.

During qualification, ask the owner to describe the space as it exists today. If plans are available, review them. If the project is developed enough to have measurements or an architectural survey, those materials will give the team a better basis for understanding the conversion.

You do not need the sales rep to determine building-code compliance during intake. You do want to uncover enough about the existing use that the proposal does not assume the conversion is straightforward when nobody has examined the space.

There can also be operational or tenant issues outside the permit professional's scope. If existing tenant areas, leases or occupied facilities are affected, those questions may need to be handled by the owner's property-management or legal team rather than being quietly folded into a permitting proposal.

Establish How Far the Project Has Progressed

The project stage tells you a lot about what the client actually needs.

Some multifamily owners will be at an early feasibility stage. They know there may be an ADU opportunity and want someone to study the property.

Others may already have a survey, conceptual layout or architectural plans. The team may have begun engineering, contacted the jurisdiction, or even submitted an application.

A project already sitting in corrections needs a different intake process. Before quoting a takeover, ask for the current plans, correction comments, application history and whatever agency correspondence is available. The existing work needs to be understood before a new consultant estimates what remains.

The same applies when another architect, engineer, contractor or permit professional is already involved. Find out what they were hired to do and whether they are staying on the project.

A clean understanding of the current team makes the eventual proposal easier to define because everyone knows which pieces are already covered.

Clarify What the Client Wants Your Firm to Provide

One of the most useful questions during multifamily ADU intake is simply to understand what the owner expects from the company they are talking to.

Consider a property owner asking:

"How many ADUs can I add here?"

They may need a feasibility study before anything else can be responsibly scoped.

Someone has to review the property, confirm the applicable ADU paths, understand the existing configuration and determine what deserves further design work.

Another client may already have that answer. Their architect has designed four detached ADUs and they need someone to manage permitting and corrections.

A different owner may need design and engineering coordination as part of the engagement. Another may be replacing a consultant midway through review.

Permit expediters, engineers, architects, design firms, contractors and full-service permitting companies do not all sell the same combination of work, so the proposal should reflect the services this particular client still needs.

When feasibility remains the major unanswered piece, it may make more sense to price that work first and reserve the broader permitting scope until the project has been defined.

That is often more useful to the client than giving them a large proposal built on assumptions that may change as soon as the property is studied.

Identify Technical Questions That Could Change the Scope

Multifamily ADU qualification can reach technical subjects fairly quickly. The salesperson does not need to answer all of them personally.

What matters is recognizing when those subjects are unresolved enough to affect who needs to be involved or what the proposal should include.

Utilities are an obvious example. Adding several dwelling units may require review of water, sewer, electrical service and other building systems. Fire access, drainage, civil work and construction access can also become relevant depending on the site and proposed configuration.

If consultants have already evaluated these conditions, ask for their work when appropriate. If nobody has studied them and the owner wants the maximum possible density on a constrained site, the project may still be at a feasibility stage.

This is also where a well-run sales process avoids making promises on behalf of the technical team.

You can explain the current state-law allowance accurately while leaving engineering, building-code and site-specific determinations with the people responsible for them.

When Is the Lead Ready for a Proposal?

A multifamily ADU lead does not need every technical detail solved before a proposal can be sent. It does need enough definition for the firm to understand what it is agreeing to provide.

Before we would consider the project sufficiently defined for a meaningful proposal, we would normally want to know:

• the property address and jurisdiction

• the current legal multifamily configuration, including the existing unit count

• whether the primary multifamily building exists today or is proposed

• which ADU path or combination the owner is considering

• the approximate number of units being discussed

• where those units are expected to go

• what plans, surveys, feasibility work or permit activity already exist

• which professionals are currently involved

• what the client wants the firm to handle

That is an operating standard for qualification, not a statutory California checklist.

There will be projects where some of those answers cannot be confirmed until a professional performs additional research. In that situation, the uncertainty itself helps define the next service.

A feasibility proposal can be completely appropriate when the client is not yet ready for a full permit-management proposal.

When More Information Is Needed Before You Quote

Certain gaps can materially affect pricing, so it is worth addressing them before sending a proposal simply to keep the sales process moving.

If the owner will not provide the address, there is very little basis for property-specific research.

If the existing unit count is unclear and the proposed ADU strategy depends on it, confirm the legal configuration before pricing around the section 66323 maximum.

If the owner wants conversion ADUs but cannot provide useful information about the existing space, you may need plans, measurements or further investigation.

Takeover projects should come with the current drawing set, application information and correction comments. Otherwise, the new firm is being asked to price remaining work without seeing the work that has already been reviewed and what is pending.

Site conditions can create the same issue. If the owner wants multiple detached ADUs on a constrained property and no reliable site information exists, somebody may need to verify dimensions, boundaries or other physical conditions before the project can be defined.

Expectations around approval also deserve careful handling. State ADU Law provides a ministerial approval process for qualifying ADUs and places meaningful limits on what local agencies can require, but the project still has to satisfy the requirements of the applicable pathway and the building and health-and-safety standards that apply.

The proposal should reflect what the team can reasonably commit to after reviewing the property rather than trying to settle every entitlement and building question during the sales call.

Good Qualification Connects the Law to the Work Being Sold

A ten-unit apartment property may have a strong multifamily ADU opportunity under current California law. It may qualify for up to eight detached ADUs under section 66323, and qualifying non-livable areas in the existing building may create additional conversion opportunities. HCD also recognizes an additional section 66314 pathway that may apply beyond the section 66323 units.

For the person responsible for sales, those rules should guide the questions rather than replace them.

The owner still has a particular building, a particular site and a particular idea for what they want to develop. Some projects will already have architects and engineers working from a defined concept. Others will begin with little more than an address and a desire to understand the property's development potential.

A useful qualification process works out where the project sits between those two points and what needs to happen next.

By the time a detailed proposal is sent, the company should have a reasonable understanding of the property, the likely ADU path, the work already completed, the unresolved questions and the services the client expects from the team.

That gives the client a proposal tied to the project they are actually considering and gives the delivery team a much cleaner starting point if the work moves forward.

Conclusion

California's multifamily ADU laws give property owners more development options than many people realize, particularly on existing multifamily sites. The current rules for detached units, conversions and combinations can create several possible directions on the same property.

That flexibility makes the intake conversation more important because the first idea the owner mentions may only represent one of those directions.

Start by confirming the property and its existing legal configuration. Understand whether the owner is working with an existing or proposed multifamily building, what type of ADUs they are considering, what the property looks like, and how much professional work has already been completed. From there, determine what service is actually being requested and whether the project is ready for a full proposal or needs feasibility work first.

The state rules provide the legal starting point. Good qualification turns that starting point into a project your company can actually scope and price.