What Is an Accessory Dwelling Unit?

An Accessory Dwelling Unit (ADU) is a secondary housing unit built on the same lot as a primary residence. Also known as granny flats, in-law units, or backyard cottages, ADUs provide homeowners with additional living space that can be used for various purposes such as renting out for extra income, accommodating family members, or simply enhancing property value. 


As a fully licensed ADU building contractor, we understand the growing demand for ADUs and the benefits they bring to homeowners. With our expertise and experience, we can guide you through the entire process of building an ADU, from design and permitting to construction and finishing touches. Our goal is to help you create an affordable ADU that not only adds value to your property but also enhances your lifestyle by providing flexible living space that suits your specific needs. Whether you’re looking to generate rental income, accommodate aging parents, or create a private workspace, we’re here to turn your ADU dreams into reality.

Call us today for a free quote and we’ll match any price you find elsewhere.

Increase your home's value by close to 30%. Spread the cost of your ADU over time.

Our flexible financing options ensure that you can achieve your project goals, providing financial stability and peace of mind while you enhance your home’s value.

Multigenerational ADU

Multigenerational Living

With thoughtful design and meticulous planning, our team can create comfortable and functional living spaces equipped with amenities such as kitchens, bathrooms, and living areas. These ADUs can serve as self-contained living spaces, providing privacy and independence for your older relatives—while fostering close proximity to the rest of your family (should they need your support).

Home Office ADU

Home Office or Studio

Looking for a secluded and conducive environment for work or artistic pursuits? We can optimize the layout and functionality of your ADU, incorporating ample natural light, ergonomic features, and soundproofing elements to enhance productivity and creativity. With your work space on your own property, you can wave “goodbye” to the commute and say “hello” to comfort and convenience!

Rental property ADU

Rental Property

The MasterCraft team can help you capitalize on your property by building an ADU tailored for rental or Airbnb purposes. By leveraging our expertise, we can create functional and inviting spaces equipped with modern amenities and stylish finishes. These turnkey properties can be built for immediate occupancy, attracting tenants or guests seeking a premium lodging experience. 

Our Expertise in ADU Construction Encompasses a Wide Range of Solutions, Including Detached ADUs, Attached ADUs and Garage Conversions

With our commitment to quality craftsmanship and attention to detail, you can expect:






Search through our photo gallery of past projects for inspiration. We can help make your dream a reality!

ADU’S Under Construction

Why MasterCraft for Your ADU Remodel?

With over 20 years of experience, MaterCraft Home Improvement is your reliable ADU specialist.

Commitment to Quality

Quality is at the heart of everything we do. From the finest materials to meticulous craftsmanship, we are committed to delivering ADUs of the highest caliber.

Flexible Financing Options

We understand that building an ADU can be a significant investment, both financially and emotionally. That’s why we offer flexible financing options to suit your budget and lifestyle.

Price Match Guarantee

We believe that quality should never come at a premium. If you find a lower price for the same product or service, we’ll match it, no questions asked.

Commitment to Quality

Unlike larger contractors, we don’t believe in charging exorbitant fees. Our pricing is upfront and transparent, with no hidden costs or surprises along the way.

Areas we serve: We serve both San Diego and Riverside Counties
with showrooms in Murrieta and Carlsbad, CA.

Our clients love ❤️ MasterCraft and so will you!

We have built a reputation for excellence and customer satisfaction with well over 100 5-star reviews.

  •   We had a pretty great experience with Mastercraft! They added a shower to our half bath and re did the flooring in that bathroom and our kitchen. Everything turned out... read more

    thumb Chelsea W.

      Thank you, MasterCraft for refreshing our kitchen. It is beautiful. MasterCraft was the only contractor we spoke to that did not try to upsell us, did not try to talk... read more

    thumb Judy B.

      Mastercrafthi remodeled our 22 year old kitchen and laundry room from ground up. Overall project was executed well. 4.5* would have been more appropriate but I decided to give 5*... read more

    thumb Aja A.
  •   We saved for years for our remodel and are thrilled with the job from MasterCraft Home Improvement. Gabe and Kayla and the team were so knowledgeable, patient, and kind. They... read more

    thumb Michelle C.

      The kitchen floor of my mobile home developed a bulge that clearly indicated water damage. I took my best shot on finding a construction company to deal with this. I... read more

    thumb David W.

      I worked with MasterCraft earlier this year to remove the staircase wall, build out the master bath and do some other plumbing, electrical and remodel work.

    They are... read more

    thumb Laura F.
  •   Do not trust all of these positive reviews like I did. Completely regret choosing this company. They took 3 times longer to complete the project than estimated with zero explanation... read more

    thumb Steve J.

      Our drains were having issues, and Bryson and Michael were at our place within an hour. They quickly fixed both sinks and were incredibly friendly and polite. 45 minutes after... read more

    thumb Peter L.

      We went with Mastercraft for a large renovation of our kitchen and two bathrooms, plus a few other things. The whole team was awesome. Gabe was really communicative as our... read more

    thumb Nicole G.


We’ll help you compare pre-qualified rates in less than 2 minutes and offer helpful tips to match you to the right financing. Try our monthly payment estimator to see what you could get within your budget.


With an ADU, your property resale value will increase by roughly 30% (depending on size and location). By renting out your ADU, you can make a passive income and earn back the cost of the project. With the increasing demand for housing in many urban areas, ADUs can offer a viable solution to address housing shortages, while providing a great return on investment. there’s typically a brief phase dedicated to design and material selection. During this time, homeowners have the opportunity to ask questions about the aesthetics of their new space and receive guidance on suitable materials to use.

We recognize that cost plays a significant role in the decision to build an Accessory Dwelling Unit (ADU). However, homeowners often discover that ADU construction can be surprisingly affordable with the appropriate resources and guidance. At MasterCraft, we offer a variety of packages tailored to different budgets and requirements. Our team collaborates with you to create a personalized plan that aligns with your financial constraints and objectives.


Moreover, many homeowners perceive ADU construction as a savvy long-term investment, whether through generating rental income or enhancing property value. If you’re apprehensive about the expenses associated with building an ADU, please reach out to us for a discussion on potential solutions. We’re committed to assisting you in navigating the process and finding a suitable arrangement that meets your needs.

Constructing an Accessory Dwelling Unit (ADU) can be a daunting endeavor, often leaving homeowners feeling overwhelmed and uncertain about where to begin. At MasterCraft, we specialize in providing comprehensive guidance throughout the entire ADU process, from initial design concepts to the completion of construction and beyond. While it’s feasible to undertake ADU construction independently, collaborating with a partner like MasterCraft can ensure that your project progresses smoothly and meets your expectations. Leveraging our proprietary process and established partnerships with reputable contractors, architects, and designers, we’re dedicated to bringing your vision to fruition. Our flexible range of packages caters to various budgets and requirements, allowing you to select the level of assistance that best suits your needs.


If you’re contemplating ADU construction and are uncertain about the necessity of partnering with MasterCraft, we invite you to schedule a complimentary consultation. We’re here to address your concerns, provide expert guidance, and assist you in making well-informed decisions.

Building an Accessory Dwelling Unit (ADU) offers numerous potential advantages, such as expanding living space for family members or tenants, boosting property value, and generating extra income through rental opportunities. Additionally, ADUs present a more economical and environmentally friendly housing alternative by leveraging existing resources and infrastructure.

There are several options available for financing an ADU, including:

  • Personal savings or funds: You may choose to finance the construction of your ADU using your own personal savings or funds. This can be a good option if you have sufficient savings and are comfortable using your own money to pay for the project.
  • Home equity loan: A home equity loan allows you to borrow against the equity in your home in order to finance the construction of your ADU. This can be a good option if you have built up equity in your home and are comfortable taking on additional debt.
  • Personal loan: A personal loan is a type of unsecured loan that can be used to finance the construction of your ADU. Personal loans may be available from banks, credit unions, or online lenders, and may have fixed or variable interest rates.
  • Construction loan: A construction loan is a type of loan specifically designed to finance the construction of a new building or home. Construction loans may be available from banks or other financial institutions, and may require that you provide a detailed construction plan and budget as part of the application process.

The cost of building an ADU can vary widely depending on factors such as the size and complexity of the unit, the materials used, and the local cost of labor. In Boise the range averages from around $150,000-$250,000.

The time it takes to build an ADU, like any construction project, depends on factors like size and complexity, contractor schedules, and material availability. On average, ADUs take between three to six months to complete. Weather conditions are also an important variable, and jobs may finish slower or faster depending on the time of year.

Yes, building an ADU can increase your property value. On average, an ADU can add anywhere from 10% to 25% to a property’s overall value, depending on a variety of factors such as location, size, and amenities. In fact, a recent study showed that properties with ADUs improved their resale value by more than 50%. ADUs are very attractive to prospective home buyers, as they offer additional living space and can be used for a variety of purposes, such as housing extended family members, generating rental income, or providing flexible space for work or hobbies.

The guidelines and regulations governing the construction of an ADU differ depending on the specific location and municipality. MasterCraft can help you every step of the way.

Schedule a FREE Estimate and Consultation for Your ADU Project

Ready to start your home improvement journey? Take the first step by scheduling a free estimate and consultation with our experienced team. We’ll discuss your vision, provide expert advice, and outline a detailed plan tailored to your needs and budget. Get in touch today to transform your house into the home of your dreams!

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