#1 General Contractor in Northern California

Rio Oso ADU Builders

Serviced ZIP codes: 95674
Awards Logos Best ADU Builder 2023 in California
Awards Logos №1 Constraction Company in Sacramento
Awards Logos №1 Constraction Company in Sacramento
Awards Logos №1 Constraction Company in Sacramento
Awards Logos #25 in California’s Top list of the fastest private growing companies #25 in California’s Top list of the fastest private growing companies
#1 General Contractor in California

Rio Oso ADU Builders

Serviced ZIP codes: 95674
Total Rating
Total Rating
Based on 826 reviews
Google Rating
Google Rating
Based on 179 reviews
Facebook Rating
Facebook Rating
Based on 143 reviews
Yelp Rating
Yelp Rating
Based on 81 reviews

Rio Oso ADU Design & Build

We take care of everything from plans and permits to construction, simplifying ADU development and guaranteeing your peace of mind.

Studio ADU

The 400 sq ft studio ADU offers an efficient open layout, seamlessly combining living, sleeping, and dining spaces. With a full bathroom and energy-efficient design, it's ideal for a minimalist lifestyle or an excellent rental opportunity.

1-Bedroom ADU

The 520 sq ft 1-bedroom ADU provides versatile living solutions. Ideal for long-term rentals, it offers a self-contained space for tenants or serves as a comfortable in-law suite, ensuring independence for extended family.

2-Bedroom ADU

The 570 sq ft ADU maximizes functionality with a full-size kitchen, two bathrooms, and two bedrooms, perfect for small families. Its thoughtful design optimizes every square foot for comfortable
living and privacy.

Custom ADU

Tailor your living experience with our fully custom ADU option. Dictate the layout, size, and features to meet your unique needs, whether it's adapting to a growing family, crafting the perfect home office or building a rental unit.

Cost Calculator

Turnkey Custom ADU

Package Details
Calculator Background Calculator Background
Monthly Payment i
Total Price i
Price/SF i
Choose Your ADU Size:



The calculations are approximate, based on A+ Construction Big Data Research 2023 Ⓒ
The calculations are approximate, based on A+ Construction Big Data Research 2023 Ⓒ

Our Latest ADU Projects

Our Process

A stress-free experience from start to finish

1. Consultation

Schedule a Virtual or an In-House Consultation with our Remodeling Consultants to discuss your project.

2. Estimate

Come in for an appointment to our Designer Showroom to go over the quote аnd pick out materials.

3. Contract

We sign a contract and get the ball rolling. You will meet with our Designer to finalize the designs.

4. Construction

We incorporate digital technologies into our construction processes to be more efficient.

Book Your Free Consultation Now

Get Financing
for Your ADU Project


Contact Solano Mortgage for a free consultation.

With 30+ years of experience, we ensure no negative impact on your FICO scores or data privacy. Solano Mortgage: your trusted lender, broker, and ally with California's largest credit unions.

Reach out to Our Experts
to Discuss Your Financing Options
Why Choose
A+ Construction & Remodeling?


We provide clear estimates that tell you exactly where your money is going.

Timeframe & Schedule

We provide an easy-to-follow schedule so you can see where your project is at and what is next, in real time.

License & Warranty

We are licensed, bonded and provide warranty on labor and materials because we believe it’s important for you to have a peace of mind.


We have a streamlined communication system that includes your own personal chat with your entire team ready to answer your questions at any time.

A+ Construction & Remodeling ADU Builders Proud to be recognized by

BBB A+ Rating
NKBA - The National Kitchen & Bath Association
NARI - National Association of the Remodeling Industry
Yellow Pages
EPA - United States Environmental Protection Agency
DR - Daily Republic News
The Sacramento Bee News
GoodDay Sacramento - CBS News
YEC - Young Entrepreneur Council
Renovate America
The Original Sacramento Home & Garden Show
Chamber of Commerce
GC Magazine
GuildQuality Member
Made In USA
ADU Calculator

What type of ADU Construction are you looking for?

Structure conversion
Please select what the ADU will contain:
Living room
Walk-in closet
Master bedroom
Raised foundation
Sliding doors
Craft room
Slab foundation
Choose at least one item
Average ADU
Price In
This field is required

Homeowners for many years have been looking for ways to get more space on the territory of their property and do not even realize that among all the options, the most affordable and perfect is the construction of an Accessory Dwelling Unit or ADU.

This is an autonomous residential unit, which is equipped with all basic life support systems and is characterized by increased functionality and comfort. ADU can serve any household purpose; with its help, you can receive guests at any time of the day, spend more time with your family, or just relax.

In this review, we will talk about the types of ADUs, present a full list of their advantages, and also share information about a professional team that can build accessory dwelling units in Sutter, California, at the highest level.

ADU Builders Rio Oso, CA

There are a large number of different configurations of accessory dwelling units. All of them differ in functionality and layout and have unique characteristics that attract the attention of every homeowner in Sutter, California. We have collected the most in-demand options for you.

Attached ADU

This accessory dwelling unit differs in the fact that it has a common border with the primary residence, passing through the wall; in addition, the points of contact can be on the roof and foundation. The main goal of attached ADUs is to expand existing space in a situation when, for example, your children have grown up and need different rooms or when you have switched to a remote work format, and you cannot do without a home office. The range of applications of attached ADUs is limitless and is determined by your imagination and needs.

Detached ADU

This type of ADU is located separately from the main house and can be placed both in the backyard and in the foreground; however, in this case, it is necessary to attach the parking lot by all the laws of the city. Most often, detached ADUs are used to accommodate guests who have decided to come for a weekend or as a permanent home for age-related parents since this is the most preferred option when relatives live on the same territory but keep their borders intact. Detached ADUs are equipped with all the necessary life support systems to maintain living standards at a high level.

Garage Conversion

Most property owners will tell you that the existing garage is the most cluttered place in the house, which is regularly filled with boxes of old things or books. This situation will not bring any benefit, unlike the garage conversion project. In place of the old parking zone, you can create a home gym, an art studio, or any additional room, be it a bedroom or a laundry.

Basement Conversion

The essence of this accessory dwelling unit is very similar to the previous position because, from a little space, builders create an authentic and aesthetically beautiful place that you will want to visit every day. It can be a relaxation room after a hard day’s work, a space for family pastime, or yoga classes. In addition, the basement can be equipped with some unusual chips, for example, an artificial waterfall from ceiling to floor, a small fireplace, or neon lighting.

Junior accessory dwelling unit

From the name, we can conclude that this project has the smallest area, and it is true. Most often, the minimum lot size of junior ADU is 200 square feet, and the maximum value rarely exceeds the threshold of 500 square feet. However, this does not negate the fact that a junior accessory dwelling unit is one of the best ways to get more space quickly and at a bargain price and solve one or several household tasks at once.

All in all, the list of projects is not limited to these five positions. However, to be fully satisfied with the quality of the constructed building, you need the services of a general contractor, and in the next part, we will tell you how to choose the ideal company.

ADU Contractor Rio Oso, CA

In various resources, you can find many examples of how one amateur builder does major repairs alone. Some homeowners have an idea that they will also build an entire project without outside help; however, this is not the case. The construction process is like a clockwork mechanism, and if at least one cog is out of place, then nothing will work.

Repair, as well as the implementation of the draft ADU, cannot do without the services of high-class craftsmen who will save you from losing emotional and physical strength, help you preserve money, and at the same time, make an ideal ADU.


ADU Contractor Rio Oso

Many property owners think that choosing a remodeling company is one of the most difficult stages of implementing an ADU project; however, if you have certain knowledge, then it will be easier for you.

It is enough to analyze the following three parameters:

  • Study the background. Before you hire a contractor and sign a contract, it is necessary to review the portfolio to assess the quality of completed projects. At the same time, pay attention to those buildings that are similar in structure and layout to your future ADU.
  • Check for a license. The activities of each contractor must be regulated by the laws of the city or state. You cannot do business with a company that does not have a permit to provide construction services, so check for a license.
  • Talk to neighbors and residents of the area. The opinion of people who have already interacted with a particular company in the past speaks best about the quality of services. Visit your friends, colleagues, or neighbors who have recently implemented an ADU project to learn about the manners and professionalism of builders and clarify the monetary issue.

Overall, surprisingly not many companies meet all three criteria. To save you time, we will say that in Sutter, California. You will not find a better contractor than A+ Construction & Remodeling, which is famous for the top level of completed projects.

ADU Unit Construction Rio Oso

The construction of accessory dwelling units should be allowed by state law. However, there is a small snag here. The fact is that, in most cases, an ordinary homeowner does not know all the nuances of state law because different rules apply to each ADU project. For example, in the case of basement conversion, it is necessary to fit into the framework of the minimum and maximum lot size, install fire sprinklers in the right places, zone the room, and adjust the ceiling height.

If we are talking about detached ADUs, then for single-family and multi-family houses, different rules apply from city to city. All this leads us to the conclusion that it is crucial to interact with lawyers. The A+ company employs highly qualified specialists who will help to issue all building permits, protect against construction bans and conduct free consultations.

Benefits of ADU Building

With all the agendas which are dedicated to deciding on the construction of an ADU, the question arises of what advantages this building has. Here we can say that the list of privileges is so long that it is not possible to mention everything at once.

We have selected five of the coolest benefits for you:

  1. Increasing the monetary value of the property. All kinds of ADU projects mentioned above can upgrade the value of your entire property by several tens or thousands of dollars. Buyers like everything that differs from standard plots, so the presence of ADU as part of the property will make your house a tasty morsel in the real estate market.
  2. A win-win investment. From the point of view of arithmetic and numbers, buying a new house or a long repair with your own hands are unprofitable investments, unlike ADU. For a relatively low price, the construction team will build an ADU, which you can use for many decades.
  3. Getting rental income. If your ADU stays without constant use, then you can rent it out. The money that tenants will pay will permit you to quickly recapture construction costs and receive passive income.
  4. Realization of dreams. In the past, each of us dreamed of some unusual room in the house, for example, for hobbies, displaying a collection of paintings, or watching movies on the big screen. ADU allows you to make a dream project out of existing space.
  5. Strengthening the family. A single-family home in the backyard will be the space that every family member will like. Here you can have fun together, communicate, and have a great time, which will undoubtedly have a positive effect on strengthening family ties.

In total, in the following parts, we will tell you even more about the advantages of ADU. However, it is important to understand that to use them; you need to find a good building company that can complete construction on the top level. In Sutter, California, such a team is A+ Construction & Remodeling.

Rio Oso ADU Construction Company

When building accessory dwelling units, it is very important to form a trusting relationship between builders and the client, which has a very positive effect on the final result. However, contrary to this axiom, some companies do not seek to work closely with homeowners.

A+ Construction & Remodeling think differently:

  1. Productive free consultation. Usually, a free consultation is limited to getting to know the team and presenting a price list. However, in the case of A+ during the initial negotiations, you can present all your ideas about the draft and share any worries. In turn, representatives of the company will help to plan the budget correctly and give valuable advice, for example, where it is better to buy materials.
  2. Individual approach. The A+ team consists of architects, designers, planners, and builders with a high level of skills in their profile. Each person can get help from a specific specialist. For example, if you can not decide on bedroom wallpaper, then our designer will always respond to your dilemma.
  3. Making adjustments. At any stage of the project, you can contact the builders with a request to make changes. If the proposal improves the final version of the ADU, then the specialists will be happy to implement your idea.

On the whole, you will not find more professional and at the same time responsive builders who will help you create your dream ADU from the unsightly existing space. You can visit the A+ office to get a free estimate or call a phone that can be found online on the web page.

Looking for More ADU Options?

Tiny Homes

TinY Homes

Experience tiny living with our innovative designs and unmatched quality

Prefab ADU

Prefab ADU

Streamlined elegance: Discover our cost-effective prefab ADU solutions

ADU Design Build

ADU Design Build

From concept to completion: Superior design, rapid construction, and cost-effective solutions

Backyard Cottage

Backyard Cottage

Seamless blend of rapid construction and superior design in your outdoor space.

Detached ADU

Detached ADU

Seamless integration of space and style with expertly crafted detached ADUs

Tiny House With Garage

Tiny House With Garage

Innovative solutions for compact living with convenient garage space

In-law Suite

In-law Suite

Superior in-law suites built with excellence and craftsmanship.

Garage Conversion

Garage Conversion

Redefining your space with innovative design, rapid execution and superior craftsmanship.

Custom Tiny Homes

Custom Tiny Homes

Your vision, our expertise: Creating custom tiny homes with superior quality

Tiny Office

Tiny Office

Elevate your productivity in custom tiny offices built with excellence and craftsmanship

ADU Estimator

ADU Estimator

Get an average price for an ADU in your area or talk to our expert to get a detailed quote.

Granny Flat

Granny Flat

Redefining independent living with top-notch design and innovative solutions.

A+ Construction & Remodeling Certifications

INC. 5000 Ranking

INC. 5000 Ranking

EPA Certification

EPA Certification

LIC #1007869 CSLB

LIC #1007869 CSLB

Accreditation with BBB

Accreditation with BBB

Member of NKBA

Member of NKBA

Member of NARI

Member of NARI

What Makes A+ Construction & Remodeling Unique


Our process is organized, streamlined and designed with you in mind.


We hold many awards and certifications in the industry.


In-house team means vendor savings passed on to you.


Professionally designed showroom with you in mind.


We provide detailed estimates showing you what you get for your money.


Furniture-grade quality products at affordable prices.


Our showroom carries the latest materials from trusted brands.


Our materials are eco-friendly and green certified.


We want you to be confident in your decision, no pressure sales.


ADU Building Rio Oso

A little earlier, we mentioned that ADUs have the widest range of advantages, and now it’s time to prove it. In addition to the positions that we presented, it is worth mentioning, firstly, a home theater. In place of the old basement, you can create a home theater with surround sound and even a 3D format.

Secondly, ADU can be an ideal place for children’s educational games. After purchasing a Swedish wall, a small trampoline, and board games, children will communicate more with each other and explore the world more actively.

Finally, one of the variants of ADU is the man cave. You can equip the space with a billiard, mini-bar, table football, or tennis, hang posters of your favorite sports teams, and organize a place to play computer games.

Prefab ADU Construction

If you are looking for an ADU construction option that does not require additional costs for replacement parking or the services of architects and designers, then we recommend taking a closer look at such a variant as prefab ADU. This is the same ADU, with the only difference being that it is fully or partially assembled at the factory and then delivered to your site, and all that remains for the builders is to put all the details together, as in the Lego constructor.

Prefab ADUs are distinguished by a fast installation period, low construction costs, and increased safety, as durable panels can withstand any abnormal weather without damage. In prefab ADUs, all family members will feel as comfortable and safe as possible.

ADU Housing

If a person decides to get an ADU on the site, then this may be the best decision in his life. ADU will permit you to take the comfort of living conditions to a new level and open up many household opportunities. For the ADU to meet all your expectations, it is best to contact professional employees from the A+ team who perform an amazing job. Call our managers by phone or visit the office in Rio Oso city to get a free estimate.

ADU Building Process Steps

Our comprehensive ADU construction process includes permit ready set of plans, interior design, submittal services, removal of debris. We are committed to using only the highest quality materials, ensuring the longevity and value of your ADU. With our ADU Building Services: From initial design consultations to the final touches, we’re with you every step of the way.

ADU Construction Process Steps

Step 1. Permit ready set of plans: Architectural plans and engineering calculations, ready for a permit application.
Step 2. Interior Design: Our expert team offers personalized design consultation to create a functional and stylish interior space.
Step 3. Permit Submittal Services: We handle the hassle of permit submissions on your behalf, ensuring compliance with local regulations.
Step 4. Removal of debris: Our efficient crew takes care of removing construction debris, maintaining a clean and safe work environment.

ADU Construction Includes

Please note that the contents of the package may vary depending on the specific terms outlined in the contract. While we strive to provide accurate and consistent packages, certain variations may occur based on the agreed-upon terms and conditions.
  • Concrete slab foundation: Enjoy a durable concrete slab foundation with proper grading and excavation for structural integrity.
  • Exterior covered porch: Create an inviting outdoor space for relaxation and entertainment.
  • Walls, partial vaulted/flat ceilings, 9′: Experience open and spacious living areas with customizable ceiling styles.
  • Gable style roof: Benefit from a classic and durable roof design that adds timeless appeal to your home.
  • Shingle type roof: Our high-quality shingles, along with gutters and downspouts, provide excellent protection and drainage.
  • Mini-split Dual zone: Achieve optimal comfort and energy efficiency with our dual-zone mini-split system.
  • Tank water heater: Enjoy a reliable water heater, conveniently housed in an outdoor galvanized water heater closet.
  • Electrical sub-panel: Ensure efficient power distribution with our electrical sub-panel, meeting all safety and code requirements.
  • Switches and outlets per code: We install switches and outlets throughout your home, adhering to electrical code standards.
  • Exterior entry doors 36×80: Enhance security and aesthetics with our high-quality exterior entry doors.
  • Standard-sized swing doors: Seamless transitions between rooms with stylish and functional doors.
  • Standard-sized interior closet doors: Maximize storage space with our efficient and visually appealing closet doors.
  • White vinyl windows: Enjoy energy-efficient windows that allow natural light to brighten your home while providing insulation.
  • Insulation per T24: Our construction includes energy-efficient insulation for optimal comfort and reduced energy loss.
  • Drywall & Orange peel or knockdown texture: Smooth and visually appealing finish with texture options.
  • Interior paint: Choose from a wide range of premium paint colors to personalize your interior space.
  • Painted exterior lap siding: Enhance curb appeal with professionally painted lap siding that withstands the elements.
  • Luxury vinyl planks: Experience the durability and low-maintenance benefits of luxury vinyl planks for your flooring.
  • Shaker style/European style cabinets: Enjoy the elegance and functionality of our shaker style or European style cabinets.
  • Tile backsplash, 18″: Add a stylish and practical element to your kitchen or bathroom with an 18″ tile backsplash.
  • Natural stone countertops: Elevate your kitchen and bathroom spaces with luxurious and durable natural stone countertops.
  • Closet and pantry shelving: Maximize storage efficiency with our customizable shelving solutions for closets and pantries.
  • Pre-assembled vanity cabinet: Our pre-assembled vanity cabinet comes complete with a countertop and splash piece backsplash.
  • Acrylic shower enclosure: Experience the beauty and low-maintenance benefits of an acrylic shower enclosure.
  • Plumbing fixtures and light fixtures: Our package includes high-quality plumbing fixtures and light fixtures as per the plan.

  • Frequently Asked Questions

    What is the need for legal services in the construction of ADU?

    A professional lawyer will help you get a building permit asap and avoid a ban on construction. In addition, the lawyer knows the details of each state law regarding ADU, for example, the difference in the permissible height of single-family and multi-family houses, which will help to properly conduct property lines and comply with all requirements.

    What are the advantages of owning an ADU in Rio Oso city?

    Even the minimum size ADU can significantly increase the cost of private property, make the living space more functional, add coziness and comfort, and also allow you to receive passive income for renting out the premises.

    How much does ADU construction in Sutter, California, cost?

    It is impossible to give an unambiguous answer to this question because the final price tag is formed, first of all, from the size of the ADU and the complexity of its design. We can only indicate approximate figures; for example, the cheapest option is junior ADU, the most expensive two-story detached ADU, and somewhere in the middle is attached ADU.

    Other Renovation Services in Rio Oso

    Serviced ZIP codes: 95674

    #1 ADU Builder with the most permits in the Sacramento area

    Thousands of Customers Can't be Wrong!

    Robert & Clara H.
    A+ Construction & Remodeling really nailed it with our detached ADU! Their team's always-on attitude was a lifesaver, and the pros at A+ not only answered all our questions, but made the whole process a breeze. From plans to final inspection - 100% great work. Plus, having a chat where we could go over pictures and get quick answers.
    Peter D.
    A+ Construction & Remodeling helped me turn my property into a profitable investment with their ADU designed for Airbnb. The well-planned design and top-notch construction attract guests, and the extra income has been a game-changer. I highly recommend their services to anyone looking to add value to their property through short-term rentals.
    Testimonial Jerry & Sheron S
    Jerry & Sheron S.
    We hired A+ Construction & Remodeling to convert our garage to an ADU. Both our project manager and the construction team were pleasant to work with. They were always on time and managed to finish the project even before the deadline they set for it. We are extremely pleased with the outcome. We would recommend A+ to anyone considering a home remodel or new construction.
    Bill W.
    A+ Construction & Remodeling did an excellent job building an ADU for my parents. The construction team was efficient and attentive, ensuring that the project was completed on time. A+ is an ideal choice for anyone looking to build an ADU for their family. I highly recommend them.
    Nancy B.
    Our 2-story ADU by A+ Construction & Remodeling is great! These team is total professionals, always ready to help. They not only had all the answers to our questions but also guided us through the details of plans and permits.
    Michael & Karen M.
    A+ team build an ADU that we turned into a home office. Their construction approach maximizes functionality and creates a productive and inspiring workspace. We highly recommend A+ as the top choice for those looking to build an ADU.