Expand What’s Possible on Your Property
Sometimes moving isn’t the answer. It’s making better use of the space you already have.
An accessory dwelling unit (ADU) can be a “granny flat” that makes room for aging parents to have their own space, a dedicated place for guests, a home office, or even just extra living space. Whatever the reason, your ADU should feel like a natural extension of your property, not an afterthought squeezed into your backyard.
ADU construction involves many moving parts. From zoning requirements and design decisions to permitting, budgets, and construction, our role at Petra is to make sure you never have to make these decisions alone.
That’s why thoughtful planning is everything. Whether you have your sights set on ADU plans for a detached guest house, garage apartment, backyard cottage, or multi-purpose living space, we’ll explore the possibilities together and guide you every step of the way.
Why Choose Petra for Your ADU Project?
The ADU builder you trust to guide you through the process matters just as much as the building itself. That’s what sets PCB apart from other contractors: relationships are at the heart of everything we do.
From the first conversation through the final walk-through and beyond, you’ll work with people who listen carefully, communicate openly, and truly care about helping you make the most informed decision.
When you work with The Pack, you can expect:
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A collaborative process and a plan shaped around your vision
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Guidance through complex ADU zoning, permitting, and planning requirements
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Clear communication so you always know what’s happening, what’s next, and who to call with questions
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A relationship that lasts beyond construction, supporting you even after your project wraps up
If you’re ready to explore the possibilities with an ADU builder who gets it, contact us to start with a quick conversation.
Why Choose Design-Build for Your ADU Project?
Want a smooth, straightforward experience? We’ve got you covered. One of the biggest advantages of a design-build ADU project is having design and construction working together from start to finish.
A traditional approach begins with hiring a designer first, then bringing a builder into the process later. Can it work? Sure, but it can also lead to budget surprises, redesigns, or difficult compromises once construction planning kicks off.
A design-build approach brings everyone to the table at the beginning. At PCB, our design and construction pros collaborate through every step of the process to help align your vision, budget, timeline, and property requirements from day one.
The benefits of design-build include better budget alignment, faster decision-making, greater accountability, shorter timelines, and a more united process. Want a better ADU and a better building experience? Choosing design-build is a no-brainer.
Frequently Asked Questions
What is an ADU?
An accessory dwelling unit (ADU) is a secondary living space that sits on the same property as your main home. ADUs can be detached backyard cottages, garage apartments, guest houses, or attached independent living spaces with a separate entrance, kitchen, bathroom, and sleeping area.
People build ADUs for many reasons. Maybe you want a comfortable place for aging parents or affordable housing for adult children. Or you want a private home office, space for long-term guests, or flexible space to support changing needs over time.
A well-designed ADU can make your property more functional, hike up your property value, and help you enjoy your space to the max.
How much does it cost to build an ADU in Boulder County?
In Boulder County, most ADU projects range from $250,000-$600,000. The actual cost depends on factors like size, site conditions, design complexity, utility connections, and permitting requirements.
Budget is important, but you should also think about how you plan to use your new digs. A simple guest house will come with different requirements (and costs) than an ADU designed for full-time living, multi-generational housing, or a tricked-out work-from-home space.
If you want a realistic range for your project, the best move is to bring us your wish list and let us help evaluate your space.
Can I build an ADU on my property?
Maybe. The real answer depends on your property's zoning, lot size, setback requirements, utility access, and local regulations.
Many Boulder County communities have expanded opportunities for ADU construction recently, but every property is different. That's why the best first step is determining what's actually feasible on your lot.
Don't worry, we're here to help with that. During the planning phase, we'll help evaluate your property's unique constraints and opportunities, walk you through the regulations, and find solutions that fit your goals. You might be surprised by how much is possible once you understand your options.
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Sarah
“The team was excellent to work with from start to finish and they helped educate us on the best way to approach the evolving project. We couldn’t be more pleased with how everything turned out and wouldn’t recommend anyone else if you want the highest quality work, skill, and attention to detail!”
Brandon
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Petra specializes in building homes, additions, renovations and basements. Proudly serving the Boulder County area and beyond.