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The price per square foot provided is an average and may vary depending on project-specific details such as materials, location, complexity, and other factors. Actual costs may differ from the average provided.
It is recommended to obtain a detailed quote based on the specific requirements of your project.
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for Homeowners
Looking to build an ADU or tackle another home improvement project? As a trusted California contractor with over 30 years of experience, we’ll help you explore financing options while safeguarding your FICO scores and data. Count on us as your ally, working closely with reputable lenders and California’s largest credit unions to find the best financing solution for your needs.
California homeowners may also qualify for the CalHFA ADU Grant Program, which provides up to $40,000 toward pre-development costs such as design, permits, site prep, and impact fees when funding is available. Learn more on our financing page.
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ADU construction costs in Hartley Solano typically range from $110,000 to $290,000, depending on size, layout, and site conditions.
| ADU Type | Size | Typical Cost |
|---|---|---|
| Studio ADU | 150–450 sq ft | $110,000 – $140,000 |
| 1-Bedroom ADU | 300–800 sq ft | $125,000 – $210,000 |
| 2-Bedroom ADU | 450–1,000 sq ft | $145,000 – $275,000 |
| 3-Bedroom ADU | 750–1,200 sq ft | $210,000 – $290,000 |
Want numbers for your property? Estimate your Hartley Solano ADU project in a few clicks.
Final pricing depends on several factors, including site preparation, utility hookup fees, design complexity, and material selections. In some cases, ADUs under 750 sq ft may qualify for impact fee exemptions, which can reduce overall project costs.
A+ Construction provides detailed, property-specific estimates so you understand exactly what your project will require before moving forward.
Most ADU projects in Hartley Solano take 6 to 10 months from start to finish, depending on permitting timelines and project complexity.
| ADU Project Stage | What Happens During This Phase | Timeline |
|---|---|---|
| ADU design and planning | Site feasibility analysis, zoning review, initial layouts, and budget planning | 3–6 weeks |
| ADU plans and engineering | Drafting plans, structural engineering, and Title 24 documentation | 4–8 weeks |
| ADU permit approval | Plan review, corrections, and final permit approval | 2–4 months |
| ADU construction | Site work, foundation, framing, utilities, inspections, and final completion | 3–4 months |
A+ Construction manages each stage of the process and works directly with local agencies to keep projects moving and minimize delays.
Do you own a home in California and want to update it? Perhaps you need a silent place for visitors, an inviting workplace, or a comfortable place for an elderly relative to live. A practical solution to these changing requirements is the construction of an accessory dwelling unit. ADUs, including prefab ADU, will increase the value of your property and give you a steady stream of extra money.
Building an ADU in California is not a do-it-yourself job; rather, professional general contractors like A+ Construction & Remodeling crew should be hired to ensure legality, compliance with building permits, and superior outcomes. You may relax and let local contractors manage every part of your new home, from developing a precise architectural plan to carrying out the works in a step-by-step manner within a predetermined timeline.
Here are some guidelines we’ve compiled to help you find reliable general contractors in Solano County:
A+ Remodeling & Construction is dedicated to providing excellent service at competitive rates. To help middle-class families in Solano County and the surrounding areas have access to luxury amenities without breaking the bank, our skilled team builds ADUs at affordable prices.
In Solano County, there are several different types of accessory dwelling units. For instance:
The detached ADU, sometimes called a backyard cottage, is the most flexible and practical option available among all additional dwelling units on the market today. It is a distinct, standalone building that can serve as a guest house, summer home, private workshop, rental property, or simply a tranquil place to unwind.
Because it is frequently the largest type of ADU, future residents will enjoy a great deal of privacy. But, creating a brand-new construction on your property, complete with its utility lines and parking requirements, is the most expensive option.
The attached ADUs are great for homeowners looking to expand their living space without building a separate home. ADUs of this type are a useful and inexpensive housing choice because they are connected to the main house by one or more walls.
This style of ADU is quite popular because individuals prefer larger bedrooms, home offices, and several bathrooms. It might work as a beneficial replacement for families with teenagers who require more privacy or want to have a master bathroom.
Junior ADUs, commonly referred to as JADUs, are a common option for homeowners with smaller lot sizes or underutilized interior spaces. Junior accessory dwelling units are smaller than standard ADUs and can only be built through conversion, with a maximum size of 500 square feet.
Yet, because of their lower size and the laxer building codes that result, JADUs offer a space and money-saving answer to the housing shortage in major California cities, including the Tahoe region. JADUs have all the components of a typical ADU, despite being smaller. A standard ADU, in contrast, may be 850–1000 square feet in size and calls for more paperwork for permits.
Basements are frequently used as simple storage facilities, but with a little imagination, they may be made into comfortable and useful living spaces. A personal theater is a common application for a basement that has been transformed since it offers space for a big screen, a dark environment, and seclusion from other parts of the house.
Even though this kind of ADU is only permitted for family use, it is still a great method to repurpose wasted space. Those looking to increase their living space or find a place for everything in a smaller home can also profit greatly from basements.
Converting the garage into habitable space will increase the usable square footage of your property. This foresighted choice affords a variety of avenues for expanding the home’s footprint. Depending on your situation, the garage could serve as an ADU (accessory dwelling unit), a guest house, or something else entirely. If you add at least one room to your garage, you can use it as an accessory dwelling unit without having to build anything more.
Whatever type of ADU you plan to construct, we at A+ would be happy to share our innovative approaches to project development and design with you. Our business also offers free consultations and cost estimates for all ADU construction projects.
Adding a new construction, like an ADU to a primary residence, must be completed under regulations that can differ by city and state. This makes hiring a trustworthy contractor, like A+ Construction & Remodeling, necessary.
We can help you inspect your property, decide on the materials and lot size, and complete the project efficiently.
The following advantages of building ADUs might be of interest to you:
So why not consider an ADU as your next home improvement project instead of a kitchen remodel or pool addition? Call A+ now and get a free estimate.
If you have decided to build an accessory dwelling unit on your property, then you might want to consider hiring A+ Construction & Remodeling as your contractor. This professional and experienced team can guide you through every stage of the construction process, and they have a track record of satisfied customers who have been impressed with their efficiency and prompt service.
Here are some reasons why A+ Construction & Remodeling is the right choice for your ADU construction project:
To sum up, A+ Construction & Remodeling is a top-notch construction company that can help homeowners build accessory dwelling units with ease. In addition to their reasonable costs and amazing job, they put the house owner first. If you’re interested, contact A+ right away to set up a time for them to evaluate the financial feasibility of your proposal.






There are many other advantages to building an ADU in Solano County. The absence of distractions in an ADU creates a conducive setting for productivity, enhancing work-life balance.
It might be a useful alternative for families looking for a quiet getaway over the holidays, or for professionals looking for a dedicated workstation. The adaptable building can be utilized as a guest house for out-of-town guests, a recreational space for family vacations, or a detached home office for remote workers.
Prefab ADUs are a quick and cost-effective solution without compromising quality. Made in professional factories, they have a shorter on-site construction period and can be up to five times cheaper than custom ADUs. These units undergo rigorous inspections and can be ordered as finished buildings in panels or modules, with logistics taken care of by the manufacturer. Opting for a prefab ADU can save you money without sacrificing quality, with clients paying three times less than for custom ADUs.
In terms of financial input, having an ADU is essential to increase the value of your home, as market research shows that houses with ADUs sell at higher prices than regular homes. Building an ADU is a wise long-term investment, and A+ Construction and Remodeling can help you achieve this by not only increasing your quality of life but also by ensuring a huge payback in the future.
ADU construction costs can vary based on several factors, including the size of the ADU, the quality of the building materials, the contractors, and the duration of the construction process. From $250,000 and $400,000, or between $300 and $500 per square foot, is the price range for a detached ADU in Hartley Solano. Whereas prefabricated ADUs cost between $60,000 and $100,000, junior ADUs can be built for between $20,000 and $100,000.
There are many benefits to hiring an ADU builder. Starting, your ADU will be constructed safely and by regulations thanks to their experience and knowledge in handling challenging projects. By coordinating and setting up the many subcontractors, they can also hasten the construction process.
General contractors can also assist you in identifying a design and materials that fit your budget and aesthetic standards. Last but not least, they assume some level of accountability for bringing the project to a timely and financially successful finish. Hiring an ADU builder will yield the best outcomes and cause the least amount of stress during the ADU construction process.
Building an ADU in California could take two to twelve months, depending on the homeowner’s schedule, the contractor’s availability, and fees. Obtaining a building permit takes around two weeks, and erecting an extra housing unit takes another two to four months.
Prefabricated accessory dwelling units are often built faster and can be ready for occupants in as little as six weeks. Keep in mind, though, that local and state rules will affect the type of accessory dwelling unit you can build.
Every accessory dwelling unit in Hartley Solano needs a building permit. Applications are reviewed by the Solano County Building & Safety Division (or your city building department for incorporated areas), which checks your plans against California’s statewide ADU law and the local zoning, building, and fire codes for Solano county. As a full design-build contractor, A+ Construction & Remodeling prepares the drawings, structural calculations, and Title 24 energy documents, then submits and manages the permit on your behalf so you don’t have to navigate the counter alone.
Under current California rules, most ADUs are approved ministerially - meaning no public hearing - and the jurisdiction must act on a complete application within 60 days. Key statewide standards that apply in Hartley Solano include:
Local factors in Solano county - such as septic vs. sewer connections, fire-hazard zones, well water, slope, and utility upgrades - can still affect your design, timeline, and cost. We evaluate these during a free site review and build them into your estimate up front, so your permit moves through the Solano County Building & Safety Division (or your city building department for incorporated areas) without surprises.
Ready to start? Get a detailed number with our ADU cost calculator, review your funding options on our financing page, or see all the communities we serve on our ADU builders page.