#1 General Contractor in Northern California

Grass Valley ADU Builders

Serviced ZIP codes: 95945
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

Grass Valley ADU Builders

Serviced ZIP codes: 95945
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

Grass Valley 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
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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

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Our homes are like our little personal projects that can always reflect our current state of life, style preferences, creativity, and so on. Hence, there can never be too many improvements made to them!

One of the changes that some of us will need to make at a certain time in life will be related to the increase in the amount of living space that we have. But what to do in case you cannot simply sell your current home and buy a new one? Build Accessory Dwelling Units (ADUs)! ADUs are a great solution to add extra living space to your property. If you’re considering building an ADU, it’s essential to work with an experienced ADU builder who can guide you through the process and ensure a successful outcome.

ADU Builders Grass Valley, CA

As Accessory Dwelling Units are considered to be tiny homes built on your property land, many homeowners think that it is easy to build them and that a simple Youtube tutorial could cover all the steps that need to be done.

Unfortunately, this is not true. Yes, ADUs are much smaller than your primary house, but they still require all the same knowledge and skills in order to be built safely and beautifully, which is why you should hire professional home builders to do the project for you!

That way, you can ensure that the whole project is done within the budget that you can afford, without any mistakes, and within a time frame that is as small as possible! Contact A+ today and find out more details about the project that could take place in Grass Valley or any other city!

ADU Contractor Grass Valley, CA

Now that you understand the importance of home builders in ADU projects, you can actually start looking for one. However, this is not a simple task, and you should take it seriously so that the new construction that would take place on your land would not bring any danger to your family.

And in order for you to ease this burden, the following list was made so that you would find decent home builders in a much shorter period of time:

  1. Consider several contractors at once so that you can compare them to each other. That way, you will increase your chances of finding the perfect home builders for your granny flat, as well as ensure that the business company hired by you will do the whole job just as you want it! Check portfolios of other contractors before you make the call to the first company that you have liked;
  2. Home builders that you will hire should be extremely honest with you from the very start. You will trust your property and money to these people, which is why you have a right to know in advance about every type of solution and service that would be required for your project. A decent business company will always provide you with a free estimate of a project; remember that;
  3. Online reviews are a good thing that will give you a basic understanding of the home builders that you are going to deal with, but you will always benefit from digging a little bit deeper. Ask around your friends, relatives, and neighborhoods about their experience with their crew of general contractors so that they can give you good advice about the whole search process, as well as tell you about companies that should be avoided;
  4. Any contractor that you will consider should always have a valid license; this is a must! Without it, you can never be sure of the quality of services provided to you, as well as about the integrity of the business company that you are dealing with. A license is your guarantee that any granny flats built by this company will be safe for your family to dwell in for many years, so search for information about them very thoroughly!

ADU Unit Construction Grass Valley

Anyone who is new to the whole ADU construction process thinks that after the business company is chosen and the design is decided upon, the building process could take place on the construction site. However, this is not entirely true.

Another crucial reason why you absolutely need to hire general contractors for your granny flats is the legal aspect of the whole process. ADU construction should always be made in sync with local jurisdiction regulations. And unfortunately for us, building codes are not universal for the entire country or even for one state law, which is why local contractors are a must so that your project would not be shut down the minute you send your documents for a building permit.

There are parking requirements, minimum and maximum square foot sizes, and many other law regulations that you need to find and implement into your project, which is why hiring A+ Construction & Remodeling or any other builder would only benefit you!

Benefits of ADU Building

By now, you already know that building an ADU in California can bring you additional living space, as well as the possibility of receiving additional income. However, these are not the only benefits that you can obtain from your ADU in Grass Valley or any other location.

Here is the list of some of them that are not as known by the public but still can be crucial to some of you:

  • During the time that the contractors will work on your construction site, your overall property land will be improved. It is common for new construction projects to require some preparation work to be made, such as land alignment, lawn improvement, and lots of other cosmetic shortcomings that your Grass Valley property might have. You might even ask for some landscaping services;
  • It is usually the case that when we finally understand that we need some additional living area for our family, we need to receive it quickly. Fortunately for you, ADUs are exactly the type of projects that would allow you to receive a fully completed new construction project after about six months from the start of the construction done by your helpful contractor, designer, and architect;
  • Even if you do not plan to rent out your ADU, you will still end up with a bigger property value once your backyard cottage is built. The more the square footage of your property, the bigger the payment that you could receive when selling your land;
  • In addition, as ADU are small in size and built on an already existing property land, they are much more environmentally friendly! ADUs leave a smaller carbon footprint, do not create a lot of industrial waste, and can be equipped with energy-efficient panels!

An Accessory Dwelling Unit or an ADU is an independent dwelling that you can build on the same property land that you have right now. It is capable of providing you with the same amount of new living space as the new house would have, but you will not need to move to another area or spend an enormous amount of money on buying a bigger property!

Hence, if you want to learn more about types of Accessory Dwelling Units and why one might need them, then we would suggest to keep on reading this article!

ADU Contractor Building Types

There are many different types of Accessory Dwelling Units that you can build in Grass Valley, California! And although this might mean that you would need to spend more time considering the options that you are provided with, this fact also allows you to find the most appropriate Accessory Dwelling Unit for the needs that you have, as well as spend just the right amount of money on its construction!

Here are the most popular choices of Accessory Dwelling Units in California that you might want to consider building as well:

  • Junior ADU

This is the smaller type of Accessory Dwelling Unit that you can create in Grass Valley or any other city, and it would involve a reconstruction of your already existing pieces of property, such as your basement or attic. Yes, it is not common for us to think of these places as the ones that could actually give us that little amount of additional space in the house, but it is possible when the project is done by a professional general contractor like A+ Construction & Remodeling!

For instance, your basement could act as a perfect place to pursue some hobbies or spend some quality time with the family. You can turn it into a small gym, an art station, or even into a home cinema!

  • Attached ADU

The attached ADU is definitely a much bigger area than the previous one, and it would not include a reconstruction of your already existing living area. The Attached Accessory Dwelling Units are independent dwellings that are built near your main residence and share one wall with it.

Such projects are perfect for those people that do not really need their new living area to be a place where some loud extracurricular activities could be pursued. For instance, you should choose an Attached Accessory Dwelling Unit in case you simply need some additional space that would allow your kids to have separate rooms or for you to have a personal office.

Yes, attached ADUs could also be used as a rental place, but they would not provide your tenants with much privacy and hence, would bring you a lower rental income.

  • Detached ADU

A detached ADU is the biggest and most independent project that you can do in California. They will not share any walls with your primary home and will not be placed inside of it as well. Detached ADUs are also often called backyard cottages or granny flats.

Such Accessory Dwelling Units would need to be built from scratch, from the foundation and plumbing placement to the wall paints and furniture orders. And because of that, a lot of mistakes will be made in case the construction is done by homeowners themselves.

Hence, you would want the help of a general contractor for this job so that no mistakes would be made and the project would be finished within the shortest period of time possible! Contact A+ Construction & Remodeling today and learn more about your ADU possibilities in California with the budget that is available to you!

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.

Grass Valley ADU Construction Company

Homeowners do not usually like collaborating with professional contractors, not only because they think that the job can be done without any help, but also because trusting your land, the house where your family lives, into the hands of unknown people is scary.

And because of that, A+ always makes sure to continue the conversation flow with the homeowners throughout the whole project in Grass Valley or any other location so that they can feel involved in the process and receive information about each step that is made!

You might want to start your search for contractors by considering A+ Construction & Remodeling as the company that could do your project. Here are some reasons why many other people come to us with their projects:

  1. The first consultation you will schedule with A+ will always be free. That way, you could easily talk with our team and receive answers to your questions without feeling like you are being ripped off for money;
  2. A+ has a huge portfolio of already completed projects throughout California. By looking at examples of our work, you could see for yourself what kind of quality is provided to our clients, and what types of projects can be done by us. No matter whether you need a simple loose tile fixture, a kitchen remodel, a plumbing replacement, or an ADU construction, A+ has got you covered;
  3. All of the employees that A+ has are highly experienced in their field. What is more, this business company ensures that all of its workers update the knowledge and skills that they have on a yearly basis so that you would receive the highest quality of services within the shortest period of time;
  4. A+ is a client-oriented business that is always focused on the needs and desires of its clients. That way, each step of the project done on the construction site will be initially considered and planned in sync with your budget possibilities and the vision that you have for the project.

A+ has proven to be the top builder in Grass Valley and California county, which is why you would only benefit from contacting us today and scheduling your first free consultation with our team in your city!

ADU Building Grass Valley

Aside from the most popular purpose of ADU to provide you with some additional living area, you can use this space for many different reasons throughout your life. In the summer, this little house can serve as a great place to rest near the pool, grill some veggies and play basketball with kids.

During the work days, this place could play the role of your home office, which is something that many adults will appreciate after COVID. Think about it, no crying kids would disturb you there, no dogs would bark in the background, and no fighting teenagers would make you angry. And once your working days are over, you can easily remodel your ADU and create your own hobby corner where you can be as loud and artistic as you want to, and no one could say a word about it!

Prefab ADU Construction

Although you already know about attached, detached, and junior ADUs, there is still one kind of backyard cottage that we have not covered: prefab ADUs.

Prefab ADUs are built not on your land directly but in a professional factory that specializes in ADU building processes. This option is perfect for those people who need to receive a new dwelling as fast as possible for a minimal price and do not care about custom design possibilities. There will be a list of options created by a designer for you to choose from, but you will not have a chance to add something of your own.

Therefore, opt for a prefab ADU in case you don’t really care about the originality of its design and want to receive the result in the quickest manner! And fortunately for you, A+ Construction & Remodeling can provide you with this type of ADU as well!

ADU Housing

Once the ADU is built, you no longer need to feel doubts its usefulness to your family! It does not matter what your initial purpose for building an ADU was; you will always have a piece of property that can be as versatile as you need it to be!

Hence, you will not only receive an increase in your property value, but you will also improve the quality of life that your family has!

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

    How much does it cost to build ADU CA?

    The final cost of building an ADU on your property would depend on multiple criteria, such as the pricing of the company that you hired, the cost of the materials that you want to use, the size of a building that you will create, and so on. Custom design ADUs will always cost you more than prefab ADUs. But on average, you can expect your ADU to cost you around 300,000 dollars, so prepare a decent budget in advance!

    How much would it cost to build a garage with ADU on top?

    On average, an above-garage ADU costs homeowners about 200,000 dollars. But, of course, the final pricing would depend on the size of an ADU that you will create, the current condition of your garage, the materials that you would like to use, and the budget that you have.

    Is it worth it to build an ADU in California?

    Yes, it absolutely is! As we have mentioned in the article above, ADU is a versatile building that you can use for many different reasons throughout your life. It can be a helpful rental place, a cozy guest house for your friends and relatives, a comfortable home for the elderly, a personal office, or a simple pool house. You can even later remodel it into a place for you to pursue your hobbies!

    How long does it take to build an ADU in California?

    The building process itself usually does not take more than six months. However, aside from the construction period, there will also be the ones related to creating plans for your future home and receiving approval for those plans from your local authorities. Lots of things need to be taken care of for the project to be approved by the law; even parking requirements could be a problem!

    Other Renovation Services in Grass Valley

    Serviced ZIP codes: 95945

    #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.