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How it Works
  • Free Consultation

    To start, a Design Everest associate schedules a consultation with you to fully understand your needs.

  • Quick Turnaround

    Once we understand your needs, we deliver Architectural Plans and Structural Engineering Drawings for your project. We have quick turnaround time, with the option to track your project in real-time

  • Easy Permit Process

    We will provide a set of drawings of the Accessory Dwelling Unit that you may submit to the Thousand Oakscity to obtain the required ADU permits. Our fixed fee includes addressing all city comments that are part of our scope (if any) on our plans until the permit is approved. Next, we can connect you with reputable ADU builders in your area, so you can get started with your ADU construction right away. Read more

A Leading Architecture, Engineering and Energy Services Provider for ADUs in Thousand Oaks, California

Our team of engineers and architects are well aware of requirements to Design and Build an ADU on your property in Thousand Oaks, California.Thousand Oaks has its own ADU which they released as per the ADU ordinance released by California Jan 2020. This Code shall be known as the “Thousand Oaks Municipal Code.” It shall be sufficient to refer to this Code as the Thousand Oaks Municipal Code in any prosecution for the violation of any provision thereof. It shall also be sufficient to designate any ordinance adding to, amending, or repealing this Code, or portions thereof, as an addition or amendment to, or a repeal of, the Thousand Oaks Municipal Code, or a portion thereof Except as otherwise herein or hereinafter provided, this Code consists of all the regulatory, penal, and administrative laws of general application of the City of Thousand Oaks, for further information visit

Accessory Dwelling Units (ADUs) Thousand Oaks, California

In Thousand Oaks ADUs are a secondary dwelling unit with complete independent living facilities for one or more people. They are an innovative, affordable, effective option to increase the value and space of your home or multi-family buildings. Today, ADUs are known by different names: granny unit, granny flat, in-law unit, in-law cottage, mother-in-law apartment, sidekick home, laneway home, backyard guesthouse, backyard cottage or secondary dwelling unit, conversions in multi-family units. ADUs are affordable in Thousand Oaks, California as they do not require paying for land, major new infrastructure, structured parking, or elevators. Further, they can provide an additional source of income for homeowners in Thousand Oaks, California.The City may not require fire sprinklers for ADUs if they are not required for the primary dwelling.The application for the ADU must be processed ministerially regardless of the approvals required for the dwelling. State law requires that ADUs be approved within 60 days of a complete application being submitted. An ADU may not be rented for a period of less than 30 consecutive days

If you are planning to build an Accessory Dwelling Unit for your home or multi-family building in Thousand Oaks, California, we can provide the following services for:

  • ADU Plans
  • Floor plans
  • Home plans
  • Modular ADUs
  • ADU architects
  • ADU blueprints
  • ADU consultant
  • Civil engineering
  • Garage ADU plans
  • ADU cost per unit
  • ADU estimate
  • JADU Plans
  • Multi Family ADU
  • Foundation for Prefab ADU
  • ADU Permit Sets
  • Garage Conversions Plans
  • ADU Permit Sets
  • Structural Engineer ADU

We provide these services for all types of Accessory Dwelling Units

  • Detached: Detached ADU is the additional spaces that are not attached to the home but are in your property area in City Thousand Oaks, California. These Detached ADU are many types of Tiny backyard home, Backyard Cottage, etc. Design Everest helps in design, Engineering, ADU permit process and construction administration support for your tiny backyard home or any detached ADU.
  • a detached ADU requires a separate building permit. Additionally, a final building inspection will not be granted for the ADU until the new house is completed.
  • The maximum allowed size for detached ADU is 850 square feet for a studio or 1- bedroom unit and 1,000 square feet for a 2- bedroom or larger unit:
  • Attached: The unit is attached to the primary structure to your home in Thousand Oaks, California.Junior and attached ADUs have the same maximum height as the primary dwelling unit.
  • The maximum allowed size for attached ADU is 50% of primary residence area.Junior and attached ADUs are subject to the same setbacks as the primary residence. Side and rear setbacks for detached ADUs are 4 ft.
  • Repurposed Existing Space: Space (e.g., garage) within the primary residence is converted into an independent living unit

Some Examples of Accessory Dwelling Units

Garage Conversions Thousand Oaks, California

Garage Conversion in Thousand Oaks is a great way to increase your home’s value or increase the house living space and this new space can be used in a variety of ways. For homeowners, adding a room is less cost-efficient and stressful than having to sell their home and move to a bigger home. Design Everest in Thousand Oaks, California can help you with the ADU design and ADU permit for your garage conversion into ADU and will help you navigate choices and decisions to find the balance of form, function, and budget.
ADU parking spaces are in addition to those required for the primary dwelling on the lot. Provided however that when a garage, carport, or covered parking structure is demolished or converted in conjunction with the construction of an ADU, those parking spaces are not required to be replaced.

Multi-Family ADUs Thousand Oaks, California

    The new ADU laws in place since January 2020 in Thousand Oaks now allow such dwelling units to be added to your multi-family buildings like condos and apartments with following specifications.

  • In Thousand Oaks, California, New units can be added within the existing non-living space of a building (e.g., storage rooms, basements, or garages). At least one unit and up to ¼ of the existing unit count may be created this way.
  • Two new homes can be built on the same lot as the multifamily building but detached from it, with 4-foot side and rear setbacks and a 16-foot maximum height.
  • Multifamily lots may have 2 detached ADUs and attached ADUs equal to 25% of the multi-family units.
Junior Accessory Dwelling Unit- JADUs Thousand Oaks, California

Thousand Oaks City has its own JADU law, A Junior ADU (or JADU) is a new category of dwelling units created by the State of California. The main difference is that a JADU is not required” with “accessory dwelling units that do not require a dedicated bathroom. On a lot with a Junior ADU, the property owner must occupy either the primary dwelling or the Junior ADU. The City may require a covenant to be recorded on the property to provide notice and disclosure to future owners of the owner occupancy requirement.
Junior and attached ADUs have the same maximum height as the primary dwelling unit. Detached ADUs are limited to a maximum height of 16 feet. No parking is required for studio units or junior ADUs.
Junior and attached ADUs are subject to the same setbacks as the primary residence. Side and rear setbacks for detached ADUs are 4 ft.

Granny Flat Thousand Oaks, California

A granny flat in Thousand Oaks, California is a self-contained living area for one or two persons usually located on the grounds of a single-family home. A granny flat can be detached and independent or it can be attached to the other dwelling in Thousand Oaks, California. It is called a granny flat because it is a popular way for families to accommodate aging parents. Other terms include granny pod, mother-in-law unit, in-law apartment, bonus unit, casita, carriage unit, and ohana unit. Most granny flats fall into the tiny house category and the surge in interest in tiny house living.

As multigenerational housing becomes more accepted, granny flats are likely to become more prevalent. Realtors and builders report that they are already a good selling point.

Services for Prefabricated ADU Units( Prefab ADUs) in Thousand Oaks, California

If you are looking to build a new accessory dwelling unit in Thousand Oaks entirely from scratch, prefabrication of your entire ADU, Design Everest Provides Foundation Engineering, for Prefab ADUs Plans to get them permitted and manufactured.

Please check out the Thousand Oaks ADU Law For More Information:
Please check out the Thousand Oaks ADU Law For More Information:
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Quality Architecture, Engineering and Energy Services For ADUs in Thousand Oaks, California
Grow your space with affordable home additions through ADUs in Thousand Oaks, California

We have huge experience in the ADU space in Thousand Oaks, California and have helped many of our clients by transforming their current house into their dream space with ADU additions. Each ADU we create is custom-built and tailored to your specific needs by our trusted team of engineers.

Get Started With Your Project Success!

Design Everest has more than a decade of experience in city Thousand Oaks, California, and has used the knowledge gained over the years to streamline the process and increase the approval rate of our blueprints for garage conversions. Our team of engineers, designers, and architects are well informed about the city guidelines and limitations for the area.

Why Design Everest?

Design Everest's list of projects, services, and clients highlight the breadth of 15+ years of experience. Our local structural engineers are committed to providing solutions that fulfill the aspirations of our clients. Clients repeatedly come back to us for our quality structural engineering design services renowned for analytical creativity and cost-effective solutions.

  • Highly experienced &
    value engineering

    We are a true one-stop -solution for Architecture and Engineering with experience in a wide range of specializations in home ADU Services as listed above in Thousand Oaks, California. Our licensed Engineers and Architects design efficient ADUs and are always looking for value engineering solutions so that customers pay less in construction, materials costs,

  • Responsiveness and
    quick turnaround

    Unlike most firms in Thousand Oaks, we leverage technology and make every effort to get quality plans delivered in weeks -- not months. Hey, who said construction has to be painful?

  • Ability to take
    on a project anytime

    Our proprietary data system. The ‘Design Hub’ allows us to efficiently forecast and optimize our resources. This means our architects & engineers in California can take on a project of any size at any time while maintaining quality and schedule.

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