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

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Vallejo Solano ADU Design & Build

We take care of everything from plans and permits to construction and comprehensive project management, simplifying ADU development and ensuring your peace of mind


A fully-custom design to give you a truly unique space that matches your style, budget, and vision for new space.


Offering multiple architectural plans for detached ADUs that have already gone through the building permit review


Our selection of expert-designed, ready-to-build ADU plans. Talk to our expert to find the perfect plan.

Garage Conversion

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

Cost Calculator

Turnkey Custom ADU

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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.

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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
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One day you may understand that your existing living space is not enough and you need to enlarge it somehow. If so, there is one proven and convenient way to do that: you can build an accessory dwelling unit, shortly called an ADU.

If you reside in Vallejo or any other area of Solano county, you might have seen such buildings around. They are typically smaller than primary housing and can be attached to houses or stand separately. Homeowners build them for different reasons and often prefer their creation to sell their existing property and buy new homes.

We have prepared this guide for you so that you receive all the necessary information about building a Vallejo ADU, finding a professional company that will become your builder for the project, and the benefits that accessory dwelling units bring into your life. Whether you want to increase your living space, accommodate family members, or generate rental income, ADU in Sacramento can be a valuable addition to your property.

ADU Builders Vallejo Solano, CA

In California, there are four types of ADUs allowed and common. When you start thinking of an accessory building next to your primary home, the first thing you should do is define the type that suits your needs and preferences.

You can select from the following types for your unit in Vallejo:


Detached ADUs are those built separately from primary housing. If you have a single-family home with no spare rooms but need some extra living space (for instance, for your parents), a detached unit is a fantastic option for you. People often call them “granny flats” because they build and use them for their parents and other senior relatives.


On the contrary, an attached ADU shares a wall with your existing home. It works perfectly if your family is expecting a child and you want to create a separate room for them right away.


This type’s name gives us a hint — when we say converted ADU, we mean that it used to have other functions and looks before but has existed as a structure for quite a while. Normally, a garage becomes a converted accessory unit because it is so easy to remodel it.


These units have certain size requirements: no more than 500 square feet. If a unit is bigger, it cannot be considered a junior one.

Generally, ADU is a rather affordable housing that can help you in numerous situations. To make your unit solid and reliable, you’d better find a professional builder that will be responsible for the whole project. Check our recommendations below.

ADU Contractor Vallejo Solano, CA

A qualified builder is essential when we talk about creating a Vallejo ADU in your property line. Hiring a team of specialists who know what they are doing is much better than trying to figure out your ADU project step by step and complete each stage on your own.

The property owner gets plenty of benefits when they sign a contract with a construction company for an accessory unit creation. The company takes full responsibility and builds the structure from scratch — and the property owner does not have to worry about it.

Here are some vital points you have to check before you sign a contract to build a unit in Vallejo city, Solano county:

Recommendations from people you know

Construction and remodeling works are quite common because people often wish to change something in their existing housing or build something new. Probably, during the last couple of years, someone you know has done some renovations. Try asking them for advice regarding a company they have worked with and its building division expertise.

Online reviews

Another way to find a trustworthy company in your city is to check various comments online. Pay attention to the negative ones: it will help you avoid the tragedy of hiring inexperienced or dishonest businesses.

Gallery of completed works

Remember to check a company’s portfolio to ensure that the team has enough expertise to provide you with top-notch service. Also, it might happen that your vision and style do not coincide with the company’s views and opinion on design, and you will understand that from looking at their gallery.


Businesses that work in engineering and construction fields in California must have certain permits and a license so that they operate lawfully. Do not forget to ask about it before signing a contract. Without permits, it will be impossible to complete your structure creation.

All these factors affect the success of your project and its completion, so do not neglect to check the above-mentioned information about each company you consider for your remodeling and construction projects in California.


ADU Contractor Vallejo, Solano

Among a wide range of contractors that operate in California and Vallejo city, one has proven its skills for many decades now. The A+ Construction & Remodeling company has worked with dozens of clients in the area and has helped them implement their most unbelievable construction and renovation dreams.

The company has careful managers who are willing to listen to the customers attentively; your ADU building will be accompanied by a professional designer, a skilled architect, and a team of talented construction workers who will provide you with the best service.

The A+ company gives you an opportunity for affordable housing and lets you be free from all worries tied to accessory dwelling unit creation. Do not hesitate to ask for a consultation and meet with the company’s reps to discuss your property improvement.

ADU Unit Construction Vallejo, Solano

Because an ADU is normally a residential property, there are certain regulations that residents should obey when they start their projects in California (and Vallejo city, particularly).

For instance, in most cases, the maximum height of an ADU in the state should be 16 feet (there are exceptions — you can check them with local authorities). A residential ADU must have a minimum lot size of 150 square feet; however, it cannot be over 1000 square feet.

There are more rules regarding setbacks, parking, and other aspects; we will not define them in this review, but you must keep in mind that they exist and familiarize yourself with them.

Another essential thing is that you have to get a permit for your ADU regardless of the town in California you reside in. Although it might seem a hard task, if you hire a company that will build your unit, it will assist you with getting a permit. Also, it will construct your unit in accordance with fire safety rules and other regulations.

If you hire a team of professionals to complete your project, you will surely get a unit that will be built properly and there will not be any problems in the future.

Benefits of ADU Building

Building an accessory unit is extremely beneficial, and here is why:

You enlarge your living space

This factor always gives you more opportunities for yourself, your family, and your friends. Many families build ADUs in Vallejo city because they feel a lack of space. A well-made unit solves the problem perfectly.

Your custom unit can be used as a home office where no one disturbs you or a room where you spend time blissfully with your favorite hobby (like painting or sewing, which often requires additional space); you can also host a long-term party, and your unit will become a guest house.

Lastly, a unit is perfect for your parents or grandparents to move in and reunite with your family. If you have a single-family home without many rooms, having a spare property for seniors makes a lot of sense. Their proximity to you will ensure that you will be able to care about them anytime.

You can organize long or short-term rentals with bigger fees

Renting out is becoming more and more popular among those who can afford more real property. If you are tired of your existing home or wish to move out and change your address due to other reasons, you can rent it and make the rent price higher with a good-quality custom unit.

Your residential space becomes attractive for sale

A residential property sale is another level where you get benefits. It is a serious event, and owners normally want to make the deal extremely profitable — an ADU will help you with that.

In all cases, the A+ Construction & Remodeling company will provide you with the best service and construct a delectable accessory unit for 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 For Every Family Change

Granny Flat For Every Family Change

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.


Vallejo, Solano ADU Construction Company

So, what does A+ suggest? With the company’s team, where all the qualified specialists have gathered, you are all set.

The company’s background is rather impressive, with over a dozen years of experience and plenty of completed projects of any complexity. The company uses the best quality materials and the newest technologies; it will also help you get your project approved by the local government and get the required permit.

With A+, you can not only build a unit from scratch but also give your single-family home a massive remodel. The company’s specialists are ready to suggest you various options that will fit your budget.

Besides Vallejo, A+ operates in other Californian cities, so if you plan to buy or build some real property in other regions, you can save the contact for the future.

ADU Building Vallejo, Solano

So, when you have your first consultation with a company that will build your project, and both parties sign the contract, your construction will officially start.

The plan is the following:

  1. On-site meeting

In the beginning, experts from the team arrive on-site to see what they will work with. Depending on the soil and surroundings, they decide what materials to use and how to build your unit and make it solid.

  1. Design planning

Designers, together with architects, will develop your unit’s plan.

  1. Building

After the plan is approved, a team will construct your unit in accordance with the designer’s offerings.

  1. Final check

When the work is done, you will be able to inspect the results.

Hiring professionals means that your unit will be built easily and in the shortest terms. Trust your property to the A+ experts, and you will not regret it!

Prefab ADU Construction

Recently, prefab ADUs have become popular among Vallejo city residents. The point is that you can order a ready unit instead of building a detached ADU from scratch. Normally, it is much cheaper than creating something new.

So, if you feel like your budget is limited, consider ordering this option. Consult with A+ managers to see if you can get your prefab unit right away.

ADU Housing

Building an ADU can significantly improve your life, and finding a good contractor to build a unit is essential. The A+ team has dozens of ADUs built behind its back and operates not only in Vallejo and Solano but also in other Californian cities and counties like Napa Valley, Santa Rosa, San Rafael, and so on.

The company’s managers will be happy to help you with your ADU. We wish you a pleasant journey in the construction world!

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

    Why should I build an ADU in Vallejo city?

    Getting an ADU will help you enlarge and improve your living space; it can solve many problems that modern families have. For example, you can use a unit as a place where you will work instead of going to the office if your boss allows you to work remotely. Also, you can ask your parents or grandparents to move in with you if you worry about them. These are just examples; there are many other benefits of ADUs for homeowners.

    How long does it take to finish an ADU project in Vallejo?

    The term depends on the unit you build. If it is something massive, you should plan at least a year to complete it. Moderate units will take about six or eight months. If you opt for a prefab unit, the term will be smaller.

    How much does an ADU in Vallejo city cost?

    On average, you should be prepared to pay 200,000-300,000 US dollars. There is no uniform number that answers this question: each unit has unique features, size, and, therefore, cost. When you turn to your local contractor, normally, its managers are capable of counting the approximate price for you; remember that it will probably grow because some details might not be considered from the start.

    Other Renovation Services in Vallejo Solano

    Serviced ZIP codes: 94592, 94591, 94589, 94590

    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.