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ADU | Accessory Dwelling Unit

Building an ADU

Accessory Dwelling Units can provide an easy source of rental income for homeowners and low-cost housing for renters. Aside from its financial benefits, many homeowners seek ADUs to expand their home for personal or professional use.

We’ll help you identify if expansion makes sense for your home, and what legal and development factors to think about, including managing the entire construction process.

Type of Accessory Dwelling Units

Attached Unit

These additions adjoin the primary home - to the side or rear of the home, or constructed on top of an attached garage.

Detached Unit

A stand-alone structure separate from the primary home. A detached ADU can be built as entirely separate unit or constructed over an existing accessory structure, such as a detached garage.

New Construction

These additions adjoin the primary home - to the side or rear of the home, or constructed on top of an attached garage.


An ADU (also referred to as a backyard home, granny flat, in-law suite, guest house, back house, etc.) is a separate living unit complete with its own entrance, living space, kitchen, and sleeping areas.


There are a lot less restrictions (lower permit fees, easier parking requirements, fewer building restrictions, etc.) for building ADUs than conventional additions. An ADU is the most convenient way to increase living space on your property. In addition, it is the most cost-effective way to increase the value of your home. An ADU can be rented out for monthly rental income or house a family member.

An ADU can be either attached or detached from the main house.

We are a one-stop shop offering all necessary services for your ADU project starting with a (free) in-person home evaluation to help you figure out the best options for your specific property. We work with an established team of bankers, architects, designers, engineers, permit expeditors, and construction teams. We are a one-stop-shop for everything you need to build an ADU.

Yes! Your garage can be legally converted into an ADU. Other options including keeping your garage and adding a second story ADU to your garage, or leaving your garage as is and building a new detached ADU, and several other options.

Yes, you can rent it out! Starting in 2020, there are no longer owner-occupancy requirements. The ADU as well as the main house can both be rented out.

There are several options to consider. The simplest and fastest is a garage conversion, other options include building a detached ADU, attached ADU, or a junior ADU (JADU).

A JADU is like an ADU however it has a smaller maximum size and utilizes existing structures. Junior ADUs are allowed to be up to 500 sq ft. and are exempt from parking requirements.

There are many factors to consider for the cost of an ADU. A typical garage conversion will overall be cheaper than new construction. Homes requiring high-end finishes can be significantly more expensive than homes with simple design and basic features. Two-story structures will also be more expensive. The cost can vary anywhere from $75-$400 per sq ft.

The permitting process can take 2-3 month. Construction on an easy garage conversion can take as little as 2 to 3 months and a more complicated larger project can take up to 5 months.

We work with bankers/brokers that will evaluate your property and specific situation and help you figure out the best financing options for your specific needs. We have access to private/hard money loans, $0 down payment loans, conventional line of credit loans,, cash out refinancing loans and more. We even have lenders that will lend you money based on improved future value of your property.

We begin with a free in-person consultation and home evaluation. This will help us see your vision, weigh your options, and plan your project. Next we will discuss possible financing options. Once you have decided to move forward with your project we will go over design and put together architecture and engineering plans. The plans will be submitted to the city and permits will be obtained. We will begin construction as soon as permits are obtained. After construction is complete we will have a final inspection and your ADU will be ready to enjoy! Either move in yourself or rent it out to tenants! We can even help with that!

Call (818)975-2310 or email to set up a free in-person consultation and home evaluation.

Or click here to book your appointment online

Some of our ongoing projects


Make an appointment for a free evaluation. We do pre-approval qualification and guarantee 100% financing with $0 down. *Terms apply.



We come to you for an evaluation of the property and zoning. Documentation for project scope and cost is provided.



We conduct a site survey analysis and begin preliminary planning, design, and engineering involving scope, and schedule to build on time and in control.


We project manage the entire design and construction process. On completion, we perform post-construction quality testing and maintenance.

Customer Stories

Pleasant hill, CA

A wonderfull experience.

Roberto Sanchez Build and ADU

Pacoima, CA

“Professional, reliable and organized. The whole project finished on time.

Carla Gomez Build a detached ADU

People Like You Love Us

Sire energy completed the project. Provided city permits as promised and was fair with job cost. The project was not without it's struggles, but construction is not always straight forward and easy, especially when building something from the grown up. The project came out as expected and for that I am happy.
Amazed how professional and seamless my 2nd story ADU is coming along - I love it and its dream come true. Ask for Pablo or Sebastian. ROCKSTARS!!! I highly recommend them ANYDAY!!!!! Pablo Sire, the owner was always super approachable and easy to talk to. Call them today if you need any renovations done to your home.
They were great! The project has made an amazing difference for us. New driveway new sidewalk and new design patio...they worked quickly, every day arrived at 7 am. The team cleaned up after very professional. The contractor were good at communicating.


Elevate your lifestyle with extra living space or see immediate value with competitive rental income. Build your opportunity today.

Let us know about your next project!

Our Pledge

“...I take full responsibility for every project done under my license, and will personally pursue after complete satisfaction from each one of our clients...”
Pablo Sire
CEO | Sire Energy Construction

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