Lars Architecture & Construction

Trusted ADU & Granny Flat Builders in San Diego, CA

Use your property to the fullest

Accessory dwelling units (ADUs) are becoming increasingly popular as a way to add living space to a property for your family, in-laws, and guests or as a place to pursue your hobbies, relax, or work. Our ADU builders in San Diego have the knowledge and expertise to help you make the most of your project. We’ll bring your vision to life and create a space that is both beautiful and functional. Feel free to reach out to us today and find out more about our expert house addition services from our professionals!

Gather ideas for your ADU project

Pacific Beach

Second-Story Addition

Ocean Beach

Second-Story Addition

Point Loma

Suite Addition

Point Loma

Room Additions

Bay Park

Bathroom Additions

Our fast-tracked design-build process

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Our ADU contractors start with an in-person consultation to assess your property in San Diego and discuss your wishes and ideas. This way, we get to learn more about your unique vision and come up with ways to make it a reality.


You can expect 3D virtual design and detailed architectural plans from our reliable and talented professionals. Every member of our team works together to create the design of your dream accessory dwelling unit.


We use BuilderTrend, our project tracking tool to ensure every stage, including construction, runs smoothly. Our crew uses top-quality materials and professional equipment to build your stunning house addition.

04_Move In

Once the ADU construction is complete, let us walk you through your brand-new living space. It comes with our home warranty, so feel free to get in touch with us if you have any questions or concerns once you move in. We’re always at your disposal.

Frequently Asked Questions

How can you expand your house?

If your home no longer meets your needs but you and your family would rather not move, a home addition project may be just what you need. Here are some options to consider:

  • Go with a bump-out. If adding a whole floor or room to your home is not a viable option for you, a bump-out may be the perfect solution. For instance, you might have a small kitchen that needs just about 40-50 extra square feet to become a fully functional and comfortable space.
  • Opt for a full house addition. This is one of the most popular options among San Diego homeowners, despite being the most time-consuming and expensive of the lot. This is because a full home addition can add substantial resale value to your home, whether you decide to get a new garage, master bedroom, or dining room. 
  • Convert a room. If you have an extra attic or garage that you don’t use for anything other than storage, converting this space into a more useful room may be a good choice. You can choose to convert your unused room into a craft room, bedroom, or workshop and get that extra square footage and functionality.
  • Go big with an ADU. Whether you’d like to have extra renting space or a starter property for your kids, adding an accessory dwelling unit is a great idea. You can choose to add a detached garage with a rented apartment above or create a modern backyard cottage as a convenient space for your close family.

What is considered an accessory unit?

An accessory dwelling unit or ADU is a term used to describe an additional, or secondary home that is built within or adjacent to a primary residence in San Diego and the region. Examples include guest houses, office rooms, detached garages, and similar.

If you’ve been thinking about improving your home with an ADU construction, you’ll first have to check if you’d be able to add to your home. As municipal and city permitting requirements and zoning ordinances can sometimes get in the way of these types of house additions, it is essential that you consult with your local architects, builders, or zoning office to check if your project would be doable.

Whether you need more information on ADU building or house addition services or wish to entrust the process to experienced contractors, Lars is your best choice. Let us add value, beauty, and functionality to your residence – contact us today.

What are the types of accessory dwelling units?

You could use the term accessory dwelling unit to describe a wide range of house addition projects. Here are some popular types of ADUs: 

  • Backyard rooms: This type of ADU is great to have in your backyard as a quiet space to relax, read, and enjoy some quiet time. 
  • Hobby rooms: In some cases, San Diego homeowners want to take up or go back to an old hobby they used to enjoy. These can be custom-made to fit that need. 
  • Office rooms: Offices are making a huge comeback in homes and outside of homes. If you need some quiet time in a productive space, an outdoor office ADU can be the perfect solution to get some work done. 
  • Converted garages: If you have a detached garage that you would like to convert to an ADU, this is a great option because now your ADU has some bones to it. The structure can then be remodeled to fit a more comfortable life.
  • Backyard cottages: A small ADU can become anything you’d like. Some ADUs create a cottage feel that makes it appear not only homey but also cozy. These ADUs have stylish kitchens and living space, perfect for inlaws, or using it as a guest room.


What are the benefits of accessory dwelling units?

Well-designed and constructed ADUs can bring a multitude of benefits to homeowners. If you depend on Lars Architecture & Construction, the preferred house addition company in San Diego, you’ll get to enjoy the following perks:

  • Added rental income from an ADU can help you offset your property taxes and mortgage cost.
  • An ADU can be customized to offer affordable, and properly-sized housing that meets the needs of renters.
  • These house additions can be a starter property for your children or elderly family members.
  • ADUs are a great option if you want to adapt your space to changing needs and lifestyles.
  • Investing in quality construction can help reduce urban sprawl through urban infill.

Does an ADU add value to your home?

An Accessory Dwelling Unit can boost both the quality of your life as well as the value of your property. The added value may come from newly acquired rental income or boosting the resale value of your home. And if you pick the right house addition contractors to enhance your home, your ADU is sure to be a worthwhile investment.

What is the best house addition & ADU construction company in San Diego?

Lars Architecture & Construction is a long-standing name in the design and remodeling industry, known for bringing top-quality house additions to homeowners across San Diego. In addition to designing and constructing value-boosting ADUs, we are also at your service for: 

Our expertise-based services are available to homeowners across the area, so don’t hesitate to get in touch whether you’re looking for a way to improve upon your home in Downtown San Diego or boost the value of your La Jolla residence. Contact Lars today!

Come to our design center and showroom

Inspiring design-build showroom in San Diego.

Visit us and get inspired for your next project.

Count on us across San Diego County

Lars Architecture and Construction offers tailored accessory dwelling units across San Diego County, including La Jolla, Carlsbad, North Park, Oceanside, Ocean Beach, and other communities. We provide lasting quality to the residents of Rancho Santa Fe and Rancho Penasquitos, transform homes in Encinitas and Escondido, and enhance your comfort in Santee and Vista alike, as well as across the region. We’re your shortcut to beautiful and functional construction that stands the test of time.

We’re the leading accessory dwelling builders in La Jolla?

Hire us for your house expansion in La Jolla and get a more spacious and more functional home hassle-free. We’ll work out comprehensive architectural plans bearing in mind your specific requirements and build your ADU or another house addition in line with stringent standards.

We’re Carlsbad’s top experts in accessory dwelling units?

Our design-build team will handle every stage of your addition project in Carlsbad, making sure that your ADU is beautiful and fully personalized. Have a rewarding experience and reap the benefits of a home improvement project carried out by top experts.

Create a custom ADU in North Park?

We perform different types of home builds in North Park, which will elevate the look and improve the functionality of your property. Reach out to us to set up your initial consultation and start creating a brand new ADU that will seamlessly match your home in North Park.

Our ADU contractors in Oceanside are seasoned experts?

With the help of experienced house addition contractors in Oceanside, your ADU will merge contemporary design and sturdy construction. We manage the process in full to ensure your peace of mind and provide you with a seamless experience.

Your project in Ocean Beach will be a success?

Partner up with Lars Architecture and Construction to spruce up your home in Ocean Beach with an accessory dwelling unit that’s both stylish and practical. Our advanced methodology, consistent dedication, and client-oriented approach yield excellent results.

Depend on us for stylish expansions in Rancho Santa Fe?

You can have greater comfort, enhanced functionality, and higher quality if you embark on a sleek project in Rancho Santa Fe. Your new ADU will bring you multiple handy perks, including extra space for guests or in-laws, allowing you to enjoy your time at home more than you ever have.

We’re the favorite AUD contractors in Rancho Penasquitos?

Set up your free on-site consultation, share your ideas with our experienced accessory dwelling unit builders, and see your project unfold quickly and efficiently. We’ll make sure that your new house addition in Rancho Penasquitos meets your family’s needs and preferences.

We’ll design your unique accessory dwelling unit in Encinitas?

Whether you have a senior family member moving in with you or want to provide your guests with a luxury experience, building a new dwelling unit on your property in Encinitas is a great idea. With our steady guidance, your ADU will bring you important advantages in both aesthetics and practicality.

Your sleek ADU in Escondido will wow you?

Impress your guests and give your family a more comfortable living environment with our streamlined accessory buildings in Escondido. We’ll outfit your new accessory dwelling unit with elegant interior design and equip it with durable fixtures and materials.

We’re trustworthy ADU builders in Santee?

Create a beautiful addition to your house in Santee that will conform to your needs in all aspects, from a functional layout to stylish fixtures. Our trained team will breathe life into your ideas, giving you a stylish ADU with a striking look and modern features.

Our expertise in accessory dwelling units is well-known in Vista?

With Lars Architecture and Construction, your personalized ADU in Vista will offer added convenience complete with top-quality materials, enhanced storage, and timeless design. Your family will enjoy the property more and have extra convenience thanks to this modern project.