house planning and architectural drawings on a table, with a small model house, key, and protractor laying on top of them

Working on a floor plan is a vital step towards getting an Accessory Dwelling Unit (ADU). Whether you are building an attached or detached ADU or simply converting a part of your existing home, you will need ADU plans.

To Buy or Design ADU Plans?

There are plenty of ADU plans that you can find on the internet. But is it really a good idea to buy those plans and not design one yourself? 

Well, that entirely depends on your needs and requirements. Here are some reasons why you should buy ADU plans and some reasons why you should design them. 

Reasons to Buy ADU Plans

The first step of any ADU project starts with planning and design, which can be quite challenging and complicated. By buying a pre-made plan, you can simplify this step and free yourself from the stress that comes with this task. 

Moreover, purchasing a stock plan from the sites listed above can help you save hundreds of dollars and weeks of waiting if you were to hire a company to draw a custom plan. 

Additionally, most companies listed below offer ADU plans that adhere to both state and municipal codes, meaning you don’t need to worry about getting approvals. 

Reasons to Design ADU Plans

Even though there are plenty of plans to choose from online, you might not be able to find one that fits your specifications. For instance, a snug place for your parents to live has different requirements than a place for a family with young children.

Before buying an ADU plan, think about your needs and constraints first. If you are not able to find a ready-made plan, it might be wise to design one yourself to ensure that all your requirements are effectively met. 

Where to Find ADU Plans?

If you have limited knowledge of the industry, finding ADU plans can be a daunting task. However, if you’ve carefully considered your specifications, finding the right choice from the top sites for ADU plans listed below should be a breeze. 

ADU Building Plans

Over the past two decades, ADU Building Plans has designed hundreds of residential and commercial projects. It helps clients find “ready-made” plans that meet their needs and offer all the resources needed for building a new ADU. 

Exterior rendering of a ADU Building Plans ADU
Courtesy of ADU Building Plans

The company aims to make the once-complex and expensive process of designing your ADU affordable and simple. It offers customizable and functional plans and guides you through the design process so that you can build the ADU of your dreams. 

What We Like About It

ADU Building Plans currently has 55 different ADU plans for you to choose from. The company offers design and construction plans for different styles, including contemporary, traditional, and modern, in both single-story and two-story builds. 

An overhead rendering of the interior of an ADU Building Plans' ADU
Courtesy of ADU Building Plans

Plans start at $49 and go up to $149. Thus, you will surely find a plan that fits your budget and requirements. All plans for purchase come with a complimentary cost to build form for collecting contractors’ bids. 

Architectural Designs

Architectural Designs offers house plans from more than 200 designers and architects. The family-owned business has been selling home plans to homeowners and builders all over North America (and even internationally) for generations. Designs include everything from ADUs and starter homes to fancy luxury houses.

An exterior front view rendering of an Architectural Designs ADU
Courtesy of Architectural Designs

What We Like About It

Architectural Designs offers ready-made plans for purchase. However, if these designs don’t match your needs, you can modify them to suit your specific requirements.

The company allows you to choose from more than 300 floor plans ranging from 298 sq feet to 7,164 sq feet for a variety of building types, including single-family homes, garages, pool houses, offices, and sheds.

Interior fitness room view of an Architectural Designs ADU
Courtesy of Architectural Designs

You can filter your choices according to the number of bedrooms, bathrooms, and floors you want in your home. In addition, you can even choose according to the type of foundation, exterior walls, and garages you want. What’s best is you can also add special features such as a loft, home office, or elevator. 


HOUSEPLANS offers a range of ready-made architectural designs. Since 2004, the company has helped thousands of people find their dream home layouts.

Interior living room rendering of a HOUSEPLANS ADU
Courtesy of HOUSEPLANS

Its goal is to provide pre-drawn blueprints to help clients save money and time. Many professional home builders depend on HOUSEPLANS for the right floor plans at the appropriate price. 

What We Like About It

HOUSEPLANS has almost 100 ADU plans and designs for you to choose from, including garage apartment plans, granny pods, and more. 

Exterior front view of a HOUSEPLANS cabin ADU
Courtesy of HOUSEPLANS

The size of these plans range from 192 sq feet to 2,313 sq feet and are priced from $305 to $1,820. You can customize your choice according to the number of beds, baths, stories, and garages you want. 

Along with a low-price guarantee, the great thing about HOUSEPLANS is it offers free ground shipping – within the continental US – on plans. 

ROST Architects 

Based in Southern California, ROST Architects is a licensed design and architectural firm committed to the philosophy of environmental sensitivity, clarity, and simplicity. 

Exterior front view of a ROST Architects ADU
Courtesy of ROST Architects

It creates architecture that’s site-specific and integrated into the local cultural and environmental conditions of the site. The company aims to integrate technology at the forefront of sustainability with every project while preserving a high degree of attention to detail and design. 

The company has also developed close relationships with local contractors, engineers, and builders who share their similar vision for the built environment and bring projects to life. 

What We Like About It

ROST offers ADU plans for studio houses, one-bedroom, and two-bedroom homes. You can also buy ROST Architects’ preliminary site analysis package to see the size, location, architectural size, and orientation it recommends for your ADU. 

We like this company because its team will review your property and offer various options for your ADU plans, accounting for your individual site circumstances, relevant codes, and your desired use of the structure.

Interior living room view of a ROST Architects' ADU
Courtesy of ROST Architects

It will present the advantages and drawbacks of every option so that you can make the right choice. Depending on your level of satisfaction, you can either continue with the project or discuss alternative options. 

Modern ADU Plans

Exterior front view of a Modern ADU Plans ADU
Courtesy of Modern ADU Plans

Modern ADU Plans offers a range of plans that you can use to convert your backyard into an oasis of excellent design. These plans allow you to generate rental income, increase your space, or bring your family together in a beautifully designed ADU. 

What We Like About It

Modern ADU Plans has a number of different ADU plans, all completely different from one another. For instance, they have the Farmhouse ADU, the Home Office ADU, the Suncatcher ADU, the Butterfly ADU, and the Stilts ADU. 

Interior bathroom view of a Modern ADU Plans' ADU
Courtesy of Modern ADU Plans

All plans include a cover sheet, terms and condition document, floor plans, roof plan, elevations, building sections, sectional and plan details, enlarged kitchen and bathroom plans, and interior elevations. 

However, if you want something beautiful and unique, you can opt for their custom-designed ADUs that are developed to your preferences and specifications. You can use their fixed price model to determine exactly how much you need to pay for the design work. 

True Built Home 

True Built Home was founded by Lewis Mann when he realized that certain home builders focused on overselling rather than actually building the homes. Thus, his focus was to build the best quality homes at the lowest cost. 

Exterior front view of a True Built Homes ADU
Courtesy of True Built Home

All in all, True Built Home aims to provide the best value homes with quality products rather than offering the cheapest square foot cost. 

What We Like About It

True Built offers 13 different ADU plans, ranging from 495 square feet to 1,199 square feet. You can either use the ready-made plan for building or get it customized to suit your needs.

Last Few Words

ADUs are an excellent way to maximize your usable living space, increase the value of your property, and simply do more with what you have at your disposal. We believe it is best that you take the burden off your shoulders using the designs that the companies listed above offer, which will definitely transform your space. 

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