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In Longview and across Cowlitz County, homeowners are transforming their properties by adding accessory dwelling units—better known as ADUs. Whether it’s for aging parents, rental income, or just more room to live, ADUs offer huge flexibility and long-term value. But getting one built right means choosing experienced ADU contractors in Longview, WA who understand local codes, permitting, and building options.
An ADU is a second, smaller home built on the same property as your primary residence. These can be detached backyard cottages, converted garages or basements, or additions with private entrances. They’re designed to be self-contained—complete with a kitchen, bathroom, and sleeping area.
ADUs have taken off in Longview, WA for good reason. Home prices are rising, multi-generational living is more common, and rental demand continues to grow. ADUs allow you to:
Many properties in Cowlitz County already have large yards or detached garages that are ideal for conversion or construction. A well-built ADU is a smart way to make your land work harder for you.
Yes, but your property must meet Cowlitz County zoning and development standards. The county’s ADU FAQ confirms that ADUs are legal when specific rules are followed. These include lot size, structure placement, utility connections, and design compatibility.
To review the full ordinance, see the Cowlitz County ordinance or view the municipal code section 18.10.585 on accessory dwelling units.
In general, your property must:
There’s no one-size-fits-all ADU design. At High Cascades Construction, we’ve helped Longview homeowners build:
Each option has its pros and cons in terms of cost, privacy, and zoning restrictions. We guide homeowners through design choices that maximize their property and budget.
Yes—with the right planning. Pole buildings (also known as post-frame structures) are a fast, affordable way to create strong and stylish ADUs. Our team at High Cascades Construction specializes in building pole barn ADUs with custom layouts, insulated interiors, full plumbing, and energy-efficient systems.
Visit our project gallery to see completed pole building ADUs in the Longview area.
Permitting is handled by the Cowlitz County Building and Planning Department. The application process typically requires:
Costs vary depending on size, finishes, and site conditions. Detached ADUs in Longview typically range from $90,000–$200,000, but budget-friendly builds (like garage conversions) can be lower. For a broader national perspective on costs and strategies, check out this ADU financing guide by RenoFi.
Construction time depends on permitting, utility availability, and site conditions. Most detached ADUs take 4–6 months from start to finish.
Many Longview homeowners are now interested in net-zero or low-impact ADUs. For tips on sustainable features—like solar panels, insulated SIP panels, or high-efficiency HVAC—visit Attainable Home’s ADU guide.
We help clients incorporate green features from the start, and we stay up-to-date on Washington’s energy code updates and rebate programs.
Building an ADU can be overwhelming. Permits, codes, setbacks—it’s a lot. But that’s why working with experienced ADU contractors in Longview, WA like High Cascades Construction makes the process smoother. We’ll help you:
We also provide full remodeling services for homeowners turning existing buildings into permitted, rentable ADUs.
We’re based right here in Cowlitz County and know the unique rules, property types, and construction needs of the region. From our residential building background to our hands-on service, we’ve built a reputation for quality and transparency.
We also know how to spot red flags—like septic limitations or setbacks—and guide you toward smart solutions. Every ADU is different, and we make sure yours fits your property and goals perfectly.
If you’ve been searching for reliable ADU contractors in Longview, WA, now’s the time to act. Permits take time, schedules fill quickly, and material costs continue to rise. Don’t let another building season pass you by.
📞 Call 360-218-0602 or contact us online to schedule your free consultation. We’ll walk your property, answer your questions, and provide a quote to get your project moving.
Whether you live in Longview, Kelso, Castle Rock, Kalama, or a rural property in Cowlitz County, High Cascades Construction is here to help you build smart, legal, and lasting ADU structures that enhance your home’s value and function.
