Accessory Dwelling Unit (ADU) Frequently Asked Questions

Top questions

Do I need to have a primary residence before adding an ADU?

In most cases yes. An ADU is meant to be an add on to your existing home or multi-family dwelling. Some jurisdictions will allow you to build an ADU

Do all ADU’s require a building permit?

In California the answer is yes. Many states now offer accelerated review processes, and even financial assistance to minimize the administrative hurdle to getting your project approved. Ikkonic’s team will handle all these entitlements as part of the standard purchase of your ADU.

Who pays for the building permits?

Building Permit fees are the clients responsibility. Each locale around the country will have unique building fees based on a variety of factors. Our permit team will present these fees to you as part of the contract process. Rest assured, there will be no surprises, as we capture and relay these costs as soon as there is enough information available about your project.

What do I need to do to prepare for delivery of my ADU?

Sit back and relax, and enjoy the show! Our expert logisticians handle all the red tape and jump through every necessary hoop to make sure your delivery is handled with care and precision. No two deliveries are alike, and our team is battle tested to ensure a seamless process.

Getting a model

How long does it take to build an ikkonic ADU Model?

Our production process in unique. The parts of our  frame system are built in advance and assembled in 1-2 days once production starts. The complete build out of your ikkonic model takes 2-3 weeks after frame is complete. Once your production begins it moves through our production line until complete.

What design options are available?

ikkonic models are available in a variety of design packages, which allow for a broad selection of grouped finishes sleceted by our interior designers. Exterior cladding, flooring and trim colors of fixtures can be interchanged with any package. Upgrade options  are available with all packages. All items available for the model you select will be visible in the design configurator with transparent pricing available upfront.

When is payment due?

A small reservation fee is due once you have approved the design and budget. Once a site analysis has been completed and site costs confirmed, we move to final contract. A formal payment schedule is presented as part of the contract for approval. Payment schedules may vary based on your method of payment, as clients using various forms of financing may have specific lender requirements. We do our best to accommodate lender draw schedules. Cash buyers are presented a specific schedule.

How long does it take to receive my ikkonic ADU?

Our models are produced on a very strict schedule. You select your production slot at the time of contract signing. We have specific number of production slots available in each month which you choose from. This ensures your model is produced on time. Delivery is scheduled based on your site work completion date. We offer free storage of your model at our fulfillment center for up to 90 days, after which storage fees may apply.


How much does it typically cost to build an ADU?

Costs vary based on size, design, and location, but generally range from $100,000 to $350,000.

Are there additional costs to consider when building an ADU?

Yes, including permits, utility connections, landscaping, and potentially upgrading existing infrastructure.

Does building an ADU increase property taxes?

Typically, yes, as adding an ADU can increase your property's assessed value.

Can I get a loan for building an ADU?

Yes, loan options include home equity loans, personal loans, and specialized ADU financing.

Is building an ADU a good investment?

Often, yes. ADUs can provide rental income and increase property value.

Permitting & Regulations

What permits are required for building an ADU in California?

Generally, a building permit and possibly others for electrical, plumbing, and mechanical work.

Are there size restrictions for ADUs in California?

Yes, size limits are set by local jurisdictions and typically range from 800 to 1,200 square feet.

Can I build an ADU on any property in California?

Most residential properties are eligible, but local zoning and lot size requirements apply.

How long does it take to get an ADU permitted in California?

Permitting times can vary, typically taking several weeks to a few months.

Do ADUs need to comply with specific building codes?

Yes, ADUs must adhere to state and local building codes, including safety and accessibility standards.


What are common financing methods for ADUs?

Home equity loans, cash-out refinancing, personal loans, and specialized ADU loans.

Can I use the equity in my main home to finance an ADU?

Yes, many homeowners use home equity lines of credit for ADU construction.

Are there government programs to help finance ADUs?

There are some state and local programs offering grants or low-interest loans for ADUs.

How does financing an ADU compare to financing a primary residence?

Financing terms can be similar, but options like home equity and specialized ADU loans are more common.

Is it more difficult to get financing for an ADU compared to a traditional home?

It can be, due to the unique nature of ADU projects, but there are increasingly more financing options available.

Home Value

How much can an ADU increase my property value?

ADUs can significantly increase property value, depending on the market and the ADU's size and quality.

Do ADUs appeal to homebuyers?

Yes, ADUs can be attractive to buyers looking for rental income or multi-generational living options.

Can I rent out my ADU?

Yes, and rental income can increase the overall value of your property.

What factors impact the value addition of an ADU?

Location, size, design, and the local rental market are major factors.

Prefab vs Site Built

Are prefab ADUs cheaper than site-built ADUs?

Prefab ADUs can be more cost-effective due to standardized designs and efficient construction processes.

How long does it take to install a prefab ADU compared to building a site-built ADU?

Prefab ADUs are generally faster to install, often within a few weeks, compared to months for site-built ADUs.

Can prefab ADUs be customized?

Yes, many companies offer customization options for prefab ADUs.

Is there a difference in quality between prefab and site-built ADUs?

Prefab ADUs are built to high standards in controlled factory environments, often resulting in consistent quality.

Are there any size limitations for prefab ADUs?

Yes, prefab ADUs are often subject to size limitations due to transportation and design constraints.


Accessory Dwelling Unit (ADU)

A secondary housing unit on the same property as a primary residence, potentially including detached units, basement apartments, or converted garages.

Site-Built ADU

An ADU constructed entirely on-site, following traditional building processes.

Prefab ADU

A prefabricated ADU built in sections at a factory and then assembled on-site.

Granny Flat

A colloquial term for a small ADU, typically meant for one or two occupants, often used for aging family members.

Zoning Ordinances

Regulations set by local governments dictating land use, including where ADUs can be built and their specifications.

Building Codes

Rules and standards that dictate how a structure must be constructed and maintained for safety and habitability.

Construction-to-Permanent Loan

A loan that covers the construction of an ADU and converts to a standard mortgage after completion.

Property Setback

The required distance between the ADU and the property boundaries, as specified by local zoning completion.


A requirement in some areas where the property owner must live in either the primary residence or the ADU.

Lot Coverage

The portion of a property that can be covered by buildings, including the primary residence and the ADU.