As Montana communities continue to grow and evolve, the need for flexible, affordable housing options is more important than ever. At Larch Architecture, we’re proud to be part of that solution by offering ready-to-build Accessory Dwelling Unit (ADU) plans—crafted specifically for life in Montana.

Whether you're looking to create a backyard cottage for aging parents, a rental unit for extra income, or a cozy guest retreat, our pre-designed ADU plans are a smart, streamlined path to getting your project off the ground.

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​Built for Montana, By Montanans

At Larch, we don’t just design for Montana—we live here. Our team understands the nuances of the state's unique building codes, climate demands, and architectural character. We've designed our ready-to-build ADU plans with all of this in mind, ensuring your project meets both aesthetic and practical needs while remaining compliant with local requirements.

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Our plans include:

• Thoughtfully designed layouts from 400–900 square feet

• Efficient use of space with natural light and storage in mind

• Energy-efficient systems and Montana-ready insulation standards

• Modern or rustic exterior options to suit urban or rural settings​​

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Need Something More Custom? We’ve Got You Covered.​

If you have a specific vision or site challenge, we also offer custom ADU design services. From modifying one of our base plans to starting from scratch, our team will work closely with you to bring your ideas to life. Customizations are available at an hourly rate, giving you the flexibility to tailor your project while staying within budget.

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Let’s Get Started​

If you're ready to explore adding an ADU to your property, Larch Architecture is here to help. With pre-designed plans, customization options, and deep expertise in Montana’s building landscape, we make the process clear, approachable, and designed for success.

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Let's Talk  reach out today to see our current plan offerings and schedule a consultation. Let’s build something that fits your life—and your land.