ADU FAQs

An ADU is a small, separate living space that is built on the same property as an existing single-family home. ADUs are also known as granny flats, in-law units, or secondary units.

We understand that cost is a major consideration when it comes to building an ADU. However, many homeowners find that an ADU is surprisingly affordable when provided with the right resources and guidance. Alley Homes offers a range of packages to fit different budgets and needs, and we can work with you to develop a customized plan that meets your budget and helps you achieve your goals.

​

Additionally, many homeowners find that building an ADU can be a smart investment that pays off in the long run by generating rental income or increasing the value of their property. If you're concerned about the cost of building an ADU, please don't hesitate to contact us to discuss your options. We're here to help you navigate the process and find a solution that works for you.

Building an ADU is a complex process, and it's not uncommon for homeowners to feel overwhelmed or unsure about where to start. At Alley Homes, we specialize in guiding homeowners through every step of the ADU process, from design to construction to move-in day. While it's possible to build an ADU on your own, working with a partner like Alley Homes can help ensure that your project stays on track and meets your expectations. We have a proprietary process, as well as established relationships with trusted contractors, architects, and designers who can help bring your vision to life. We also offer a range of packages to suit different budgets and needs, so you can choose the level of support that works best for you. 

​

If you're considering building an ADU and are unsure whether you need a partner like Alley Homes, we encourage you to reach out to us for a free consultation. We're here to answer your questions and help you make an informed decision.

If you live in the Treasure Valley (Boise, Eagle, Meridian, Nampa, Caldwell, Kuna, Star, Middleton) the simple answer is: yes! With very few exceptions, all residential zones allow the placement of an accessory or secondary dwelling unit. However, each municipality has its own set of rules. Learn more.

There are several potential benefits to building an ADU, including providing additional living space for family members or renters, increasing the value of your property, and providing a source of additional income through rental. ADUs can also be a more affordable and sustainable housing option, as they allow homeowners to utilize existing resources and infrastructure.

It's a common misconception that building an ADU means losing your garage space. While some ADUs are built by completely renovating a garage, there are actually several ways to build an ADU without sacrificing your garage. Alley Homes offers plans for building both above-garage units and 2nd story units with a carport underneath. These options allow you to build an ADU while still retaining your garage space for parking and storage.

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.

Our current service area is the Boise city metro. ADUs are allowed in most residential zones of Meridian, Eagle, Nampa, Caldwell, Kuna, Star, and Middleton, but each municipality has its own rules and regulations. We'll soon be expanding to the rest of the Treasure Valley soon. Contact us to be added to the waitlist!​

The rules and regulations for building an ADU vary depending on your location and municipality. The basic zoning rules and guidelines for Boise can be found on the city's Planning and Zoning website.

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. Read our Pricing page for a more comprehensive breakdown.

Treasure Valley residents (Boise, Eagle, Meridian, Nampa, Caldwell, Kuna, Star, Middleton) are allowed to build an ADU on their property, following their city's zoning guidelines, including lot size and setback requirements.

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.

There are several ways to find a contractor to build your ADU, including researching and comparing estimates from multiple contractors, consulting with a construction broker, or asking for referrals from friends or family members who have built an ADU. It is important to carefully research and compare contractors in order to find a qualified and reputable professional who is able to deliver high-quality work at a fair price.

There are several ways to finance the construction of an ADU, including using savings or personal funds, taking out a loan or mortgage, or using a combination of these methods. It may be helpful to research and compare financing options, such as home equity loans, personal loans, or construction loans, in order to find the option that best fits your needs and budget.

An accessory dwelling unit—different from an accessory structure like a shed or dedicated home office—is a living space that requires a certificate of occupancy from the city inspector. In Boise, ADUs are required to have a kitchen, full bath, and separate address from the main house.

Ongoing costs may include property taxes, insurance, utilities, and maintenance costs. It is important to research and budget for these costs in order to understand the full financial impact of building and owning an ADU.

In short—yes. However, it is important to research and understand the specific rules and regulations of your local jurisdiction, as well as any tax implications. It may also be helpful to consult with a legal or financial professional to ensure that you are in compliance with all applicable laws and regulations.

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.