Custom Accessory Dwelling Unit (ADUs) in Corvallis, OR

Offering Tailored ADU Solutions for Families and Homeowners in Corvallis, Philomath, Albany, and Lebanon.

Whether you're thinking about a guest suite, a creative she-shed, a personal workshop, or a private space for an aging parent, we help you design and build custom Additional Dwelling Units (ADUs) that fit your life. We plan everything with your requirements, existing setup, and budget in mind.

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What Makes Our ADU Builds Different

No two families or backyards are the same, and neither should your ADU. Every ADU we build is customized to meet your specific plan, usage, and budget. After all, what's the point of an ADU if it doesn't work for you?

Personalized Designed Just for You

While some families need a quiet escape, others want a place for the family to stay. We adapt every ADU project to your unique use and lifestyle.

Work with A Clear Budget

Leave the stress behind with a crystal clear, upfront budget. From start to finish, we’ll help you understand your options, stay within budget, and avoid surprise costs.

Endless Design Possibilities

Get your ADU designed and built the way you imagined it. We build ADUs in all shapes and sizes, including mother-in-law cottages, creative studios, rentals, and everything in between.

One Team for Everything

Manage your ADU project easily with only one team to handle. We’ll take care of everything, including design, permits, carpentry, trades, and cleanup.

Types of Accessory Dwelling Units (ADUs) We Build

Since 2013, we’ve served homeowners in Corvallis, Albany, Philomath, and Lebanon, looking to expand with functional and beautiful ADUs. Instead of offering traditional options, we specialize in bringing your dream ADU to life. But here are a few ideas to get you started:

Purpose-Based ADUs:

Close-up of a bedroom corner showing part of a bed with a red quilt and green pillow, a nightstand with a black lamp, a window with closed blinds, a wall with a framed floral painting, and a warm yellowish wall light.

Guest & In-Law Rooms

Create a cozy and private spot for family or friends to stay. Perfect for welcoming loved ones without sacrificing your own space.

Living room with white and red walls, hardwood floor, green sofa, orange chair, brick fireplace with a fire, large windows showing outdoor greenery, a painting on the wall, and a vase with flowers on the mantel.

Storage & Hobby ADUs

Keep your home organized with a dedicated space for tools, crafts, or storage. It’s the extra room you didn’t know you needed.

Two workers installing plywood on the roof of a house during daytime. One worker is standing on a ladder, cutting plywood, while the other is bent over, working on the roof surface. The roof has some existing shingles and a chimney is visible in the background.

Detached ADU (DADU)

Create a separate building on your property that offers full privacy and flexibility. It’s great for families who want their own space.

A house under construction with wood framing and exterior sheathing, set against a backdrop of green trees and distant mountains, under a blue sky with scattered clouds.

She Sheds & He Sheds

Need a quiet place to unwind, work on hobbies, or get creative? These custom sheds are made just for your personal escape.

A two-story house painted in gray and yellow with a gabled roof, surrounded by a garden with green grass, yellow flowers, bushes, trees, and a stone pathway.

Rental Property Units

Generate extra income with a fully equipped detached rental on your property. A smart way to boost your income right at home.

Structural ADUs:

A mountain range with patches of snow on the peaks and dark green trees at the base, under a partly cloudy sky. In the foreground, there is a modern house with a metal roof, wood siding, large windows, and a small wooden balcony, surrounded by a grassy yard and a wooden fence.

Attached ADU

Connect an ADU to your home, complete with a private entrance, for the best of both worlds. It’s close but independent.

Wooden staircase with metal railings leads up along a stone wall of a building with large windows. The sky is clear and blue.

Garage Conversion ADU

Easily turn your garage into a livable unit. A budget-friendly way to add space without building something new.

A backyard wooden deck with outdoor furniture, potted plants, and a garden on the right, surrounded by lush green trees with dense foliage, under bright sunlight.

Backyard Offices & Studios

A home office or studio just steps away lets you focus without distractions. Ideal for working remotely or pursuing your passions.

People working on a construction project on a house roof, with one person using a power tool and others assisting, surrounded by roofing materials and scaffolding, under a partly cloudy sky.

Young Adult Housing

Give grown kids or family members a place nearby where they can have privacy but still be close when needed.

Worker installing wooden beams on a construction site with scenic rural landscape and mountains in the background.

Over-Garage ADU

Utilize the space above your garage to add comfortable living quarters without occupying your yard.

A yellow two-story house with gray shingle roof, multiple windows, surrounded by green trees and bushes, with sunlight casting shadows.

Junior ADU (JADU)

Build a small, cozy unit inside your home, usually under 500 square feet. It’s perfect for guests or affordable housing needs.

Need something more unique? Let’s talk

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Our ADUs Portfolio

  • A mountain landscape with snow-capped peaks, a wooden house with a metal roof, surrounded by trees and a wooden fence, under a partly cloudy sky.

  • A yellow house with a steep gray roof and multiple windows, surrounded by greenery and trees.

  • Construction house in a rural area with wooden framing, partially covered with Tyvek house wrap, set against a backdrop of hills and a blue sky with scattered clouds.

  • Two construction workers are working on the roof of a building, installing wooden framing for a new dormer window. One worker is standing on a ladder, while the other is bending down. The roof is partially covered with plywood sheathing. There is a brick chimney and a chimney cap visible on the roof. The sky is clear with some clouds and trees in the background.

  • A house with yellow and gray siding, multiple windows, and a gabled roof surrounded by trees and a garden with green grass and yellow flowers.

Our ADU Construction Process

A two-story house with a grey and yellow exterior, featuring multiple windows and a front porch, surrounded by a garden with green grass, flowering bushes, and a tree-lined yard under a partly cloudy sky.
Two people sitting at a table having a conversation, with a speech bubble above one person.

1. Consultation: We visit your home to discuss your ideas, budget, and goals.

Icon of a rolled blueprint with a floor plan and a pencil.

2. Design & Planning: You receive a detailed plan that accurately reflects your vision and complies with all local codes.

Icon of a check, a receipt, a smartphone, and a tablet with a stylus, all representing financial or payment processes.

3. Estimate: We provide a clear, line-by-line breakdown with no room for guesswork.

Icon of a calendar with a clock in front of a green and gray background.

4. Scheduling: Once approved, we’ll set the start date and get to work.

Icon of a construction worker wearing a safety helmet with a building and an arrow surrounding the person.

5. Construction: Our crew handles every part of the construction.

Icon of a document with check marks and a ribbon badge, symbolizing certification or achievement.

6. Final Check: We match every detail to your expectations.

Meet Our Happy Clients

  • Michael Boock

    ⭐️⭐️⭐️⭐️⭐️

    “Crowsfoot Carpentry did an outstanding job on our kitchen remodel. From start to finish, their communication was honest, straightforward, and clear. Their timing was impeccable—they met every deadline! Great bunch of guys and every subcontractor they brought in was top-notch, reflecting their commitment to quality and professionalism. We couldn’t be happier with the final result.”

  • Deanna Brooke

    ⭐️⭐️⭐️⭐️⭐️

    Our remodel project finished on time, on budget, and ended up better and more beautiful than we could have imagined. And the extra benefit of a great bunch of guys! We thank you and the whole crew for a great job and just a really great experience. Thank you, thank you, thank you.

  • Elisa D.

    ⭐️⭐️⭐️⭐️⭐️

    Frank and his team built our home from the ground up. He stuck it out with 3 years of planning with us and later the permitting process. We now have our dream home with the personal touch and attention that Frank and his crew provide. The project could not have been completed without them!

  • Jeff Rodgers

    ⭐️⭐️⭐️⭐️⭐️

    Crowsfoot Carpentry has done a number of projects for us ranging for building a wine cellar to a custom deck. They are extremely competent, friendly, and willing to take on adventurous projects. I would not hesitate to hire them for any remodeling or building project.

Building ADUs in the Willamette Valley Since 2013

For over a decade, we’ve been helping homeowners expand their living space in Corvallis, Philomath, Albany, Lebanon, and surrounding communities. Our team is familiar with local building codes and ADU trends, and we bring your idea to life without exceeding your budget.

Certifications and Memberships:

  • BBB Accredited 

  • NARI Member (National Association of the Remodeling Industry) 

  • Western Oregon Builders Association Member

  • EPA RRP (Renovation, Repair, and Painting) Certified 

  • Licensed with the CCB 

  • Approved Builder with Oregon State Credit Union

Learn More About Us

FAQs about Our ADUs

  • The cost varies depending on size, design, materials, and site conditions. On average, ADU construction in Corvallis can range from $100,000 to $250,000. We provide a detailed and transparent estimate during your consultation to ensure it fits your budget.

  • You can build guest cottages, mother-in-law suites, backyard offices, studios, storage units, or rental-ready tiny homes. We customize every ADU to meet your specific needs and property space requirements.

  • Yes, most ADUs require permits and must comply with local zoning and building codes. We can guide you through the process and coordinate with your local city office to ensure a seamless experience.

  • We build virtually anything from guest cottages to she-sheds to rental-ready tiny homes. Our forte is to turn your dream project into a beautiful, functional ADU.

  • Yes, existing garages, basements, or outbuildings can often be converted into ADUs with remodeling. We assess your space and advise on the best approach.

  • Our process includes consultation, design and planning, permitting, construction, and a final walkthrough. We handle everything to ensure your ADU matches your vision and needs.

  • We specialize in designing for both small and large properties, maximizing the use of your space.

  • ADUs must follow Corvallis zoning rules, setback requirements, height limits, and safety standards. We stay updated on codes and ensure your project is fully compliant.

  • A professional builder ensures your ADU meets all codes, stays on schedule and budget, and is built with quality craftsmanship. We handle permits, inspections, and manage the entire project for a stress-free experience.

  • Like the cost, the timeline also depends on factors such as size, design, finishes, and site conditions. We’ll keep you informed of the progress and finish the work on time.

Build Your Dream ADU Today

Get expert insights, transparent pricing, and a plan that brings your dream ADU to life. Schedule your no-pressure consultation and explore what’s possible for your property.