It depends on whether you want to build one of our popular stock models or go fully custom. Stock model ADUs typically start around $150,000–$200,000. Custom ADUs generally run $250,000–$350,000+, depending on size, site conditions, and finish level. Either way, the only way to get a real number is a site-specific estimate.
From signed contract to move-in, most ADUs take about 6–9 months. Stock plans are typically on the faster end since the design is already complete. Custom ADUs may take a few weeks longer to design upfront, as we tailor the layout to your property and goals. Permitting timelines are generally similar in both cases, but can vary depending on the jurisdiction and zoning requirements.
The most common challenges: underestimating total costs (permits, utilities, and landscaping add up); choosing a builder based on price alone; starting the process too late when a family situation becomes urgent; skipping the site assessment; and choosing a company that isn’t well-versed in every aspect of an ADU build. Starting early, before you need the space, and understanding the full scope of your project can help avoid delays and unexpected costs.
Hiring your own GC may involve sourcing an architect, managing permits, and coordinating multiple subcontractors yourself, often without a single point of accountability. My ADU’s design-build approach brings everything under one point of contact, handling design, permitting, and construction under one contract to keep the process more streamlined and turnkey. For most families managing real lives, that clarity and accountability is worth it.
We do our part to keep permits moving — filing thorough, code-compliant applications and staying in regular contact with permitting offices throughout the process. But we don’t ultimately control the review timeline. What we can promise is that we’ll be upfront with you about where things stand and why.
Size limits and setback requirements vary by city, zoning, and lot conditions.. In Vancouver/Clark County, detached ADUs can be up to 1,000 sq ft, with typically a 5-foot rear and side setbacks. . In Portland, ADUs are generally limited to 800 sq ftADU rules vary by zone — use our site tool to see how a model fits your property, or book a free assessment.
Less than some people expect — but it is a major construction project. Site prep, foundation work, framing (4–6 weeks) brings the most activity: equipment, noise, and real disruption to your yard. After that, the build quiets down considerably. We are respectful of neighbors, keep the site clean, and schedule loud work during weekday daytime hours.
Yes. We have a portfolio of completed projects across SW WA and NW OR, ranging from compact 400 sq ft units to larger custom homes. We can connect you with past clients who are willing to share their experience — and, in some cases, walk you through their finished ADU in person. We also host open houses, so you can walk through a finished ADU and picture how it could work for your own family.
Yes. ADUs are flexible by design and can be used in different ways over time. A space that works for a parent today can later be used as a rental home, a guest suite or a home office, often without any major changes.
Assisted living in the Portland/Vancouver area averages $5,500–$6,000/month — that’s $66,000–$72,000 per year, going up annually. An ADU built for $250,000-$350,000 can reach break-even in 4-5 years. Throughout that time, you’re building equity instead of writing monthly rent checks. and your loved one stays close.
Manufactured ADUs are built to federal HUD standards and are typically delivered as a complete unit, and depreciate over time.
Prefab or modular ADUs are built in sections off-site and assembled on your property, often reducing construction time.
Stick-built ADUs are constructed on-site and offer the most flexibility in design, layout, and integration with your existing property. They are built to the same standards as a primary home, are viewed as part of the real property, and hold their value consistently over time.
Drawing on our custom homebuilding background, My ADU builds stick-built for lasting quality.
Most single-family residential properties in these areas qualify. Washington’s HB 1377 (effective July 2025) reduced barriers statewide, and Portland has long been ADU-friendly. Eligibility depends on your specific zone, lot size, slope, and utility capacity. We pull your zoning information and walk your property at the free consultation.
In Clark County, well-built ADUs typically rent for $1,200–$2,200/month. In Portland, that range is closer to $1,400–$2,500/month. A 700–800 sq ft unit at $1,500/month generates $18,000 annually. Over 10 years, that’s $180,000+ — a meaningful return on a $250,000-$350,000 $ build.
Most families use a home equity loan, HELOC, or cash-out refinance. Construction loans and renovation products like Fannie Mae HomeStyle are also common. We work with local lenders who specialize in ADU projects — some can lend against the ADU’s appraised value, which helps even if your available equity feels limited.
Yes. In our experience, resale value typically increases by roughly the cost of the build itself — which can mean $250,000 or more for a custom ADU. A well-built, properly permitted ADU is an asset. ROI also depends on how you use the space and how long you stay in the home.
The hardest part of most ADU projects isn’t the construction — it’s the conversation. Nobody wants to feel like they’re losing independence, and nobody wants to feel like a burden. We created a free guide to help families think it through together before any decisions are made.
ADU stands for Accessory Dwelling Unit. They are also commonly referred to as a “Tiny Home”, “In-Law Suite”, “Granny Flat”, “Backyard Home” and many other names.
Use Our Free Property Eligibility Calculator and/or contact our team for a free in person site visit.
Anyone is allowed to live in an ADU. This makes it great for yourself or family to live in. You can also use it as a long-term rental unit or a short-term rental (Airbnb/VRBO) to generate extra income. Some jurisdictions require the property owner to live on site, whether that be in the main house or in the ADU, while other jurisdictions allow both the house and ADU to be used as rentals.
We work hard to design products/layouts that our clients will love for years to come. Many features are customizable in our ADUs. Owners have the option of customizing colors and certain finishing materials. Ask us! We want to work with you!
Each city and county has specific regulations that determine what size ADU you can build on your property. In most cases, your ADU can be 40%-50% the size of your main house (up to 800 sq. ft.).
Each ADU comes move-in ready with a full kitchen, full-size appliances, a full bathroom, and laundry center. We handle everything from the permitting process, site work, building process and utility connections. Once we pass the final inspection by your local building department, your ADU is ready to use!
Our clients enjoy the convenience of living close to family. Using the ADU for multigenerational living or just extra living space are both great options. Renting the unit is also a great way to add revenue to your existing property. With rising housing costs, our ADUs make more financial sense than ever.
My ADU has developed plans and procedures that coordinate with the requirements from the local jurisdictions. This helps us get through permitting quicker and easier, saving you time and money.
Know more about our permitting process
Jeff, Luke, Amanda and the rest of the team were fabulous to work with. They have amazing customer service and communication. They made the process of building our ADU very enjoyable and we are incredibly happy with the outcome and product. We highly recommend them!
We needed to remove an old Garage and turn it into an ADU for mom in-law in downtown Vancouver, WA. MyADU worked with us – and for us – on planning, designing, permitting and construction. MyADU did everything they committed to at the highest quality and in less time than expected. This is a contractor that you can trust and they know the ADU market / industry well!
When we decided to build a granny flat in our backyard, we researched builders in the area and selected MyADU as our general contractor. It turned out to be an excellent choice for us. Luke Shaffer and the MyADU team provided high quality guidance and coordination from start to finish, astutely man…
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My ADU was founded as an answer to a growing demand in 2019. After over 30 years in business building custom homes, we saw the opportunity to bring clarity to the updated Accessory Dwelling Unit laws locally.
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