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Serving States — WA & OR
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Expand your Portland, OR property with a thoughtfully designed Accessory Dwelling Unit, built for flexibility, value, and long-term use.
An Accessory Dwelling Unit (ADU) is more than just additional space, it’s a flexible solution that adapts to your lifestyle and long-term goals. Whether you’re creating a private living area for family, generating rental income, or simply adding functional space, an ADU offers lasting value.
With changing zoning opportunities across Washington and Oregon, homeowners now have more flexibility than ever to build secondary living spaces on their property. A well designed ADU not only enhances usability but also increases overall property value
At Nick and Sons, we approach every ADU in Portland, OR with a focus on smart design, efficient use of space, and seamless integration with your existing property ensuring it looks, feels, and functions like a natural extension.
Nick and Sons is built on quality, craftsmanship, and years of hands-on experience. We create functional, durable, and thoughtfully designed spaces with precision and care. Every project reflects our commitment to exceptional workmanship and lasting results.
ADUs in Portland, OR offer both immediate benefits and long-term value. With the right design and execution, they can transform how your property is used and significantly increase overall functionality and appeal.
Separate structure for full privacy
Connected to your existing home
Transform unused space into living space
Maximize underutilized space with smart design
Optimized for efficient everyday living
We understand your goals, budget, and property conditions while evaluating zoning and site feasibility for a smooth ADU plan.
We create efficient ADU layouts and detailed designs tailored to your space, needs, and long-term use, ensuring maximum functionality.
We handle all required permits with the city and manage the full construction process with regular updates, supervision, and quality control.
We complete interior detailing, final inspections, and deliver a fully ready ADU that is functional, compliant, and built to last.
ADU projects in Portland, OR involve more than just construction — they require careful planning, zoning knowledge, and precise execution. Without the right team, small mistakes can quickly turn into costly delays.
Our team handles the entire process with clarity and experience, so your ADU is built efficiently, meets all requirements, and delivers long-term value without unnecessary complications.
We plan every detail from layout to permits to avoid delays and surprises.
Clear communication keeps your project on track at every stage.
From smart layouts to quality construction, your ADU is built to perform and last.
Building an ADU is a smart investment but it doesn’t have to feel overwhelming. With flexible financing options, you can move forward sooner and spread the cost over time.
At Nick and Sons, we help you explore financing solutions that fit your budget, so you can confidently plan your ADU without unnecessary stress. Our goal is to keep the process simple, clear, and accessible from day one.
Whether you’re planning a compact unit or a fully custom ADU we’ll guide you through options that make your project achievable without unnecessary financial pressure.
One of the first questions every homeowner asks is: what’s this going to cost? The honest answer is that ADU pricing in Portland, OR isn’t one-size-fits-all — and anyone who gives you a flat rate without understanding your project is guessing. Here’s a straightforward breakdown of what drives cost so you can plan with confidence.
The size and type of ADU you build is the biggest cost driver. A small space ADU or garage conversion costs significantly less than a fully detached ADU built from the ground up. Attached ADUs and basement conversions fall somewhere in between. Larger scope means more cost — but also more value and income potential added to your property.
The category of ADU directly affects budget. A detached ADU on your property involves its own foundation, framing, roofline, and full utility connections. An attached ADU shares a wall with your existing home, reducing some structural costs. A garage or basement conversion works with an existing structure, which can lower costs but still requires plumbing, electrical, and insulation work. We’ll walk you through realistic numbers for your specific project from the very first conversation.
The materials you choose — from siding and roofing to flooring and fixtures — have a direct impact on cost. We offer options at multiple price points without compromising structural quality. Whether you want budget-friendly finishes or premium custom materials, we’ll match the ADU to your existing property and your investment goals.
All ADUs require permits, We handle the full permitting process, but these fees are part of your project budget. Site conditions — soil, slope, utility access, and existing structures — can also affect cost. We identify these factors during the planning phase so there are no surprises mid-project.
The only way to give you a number we’ll actually stand behind is to understand your specific property and project. We offer free consultations and detailed written estimates with no hidden fees. No guesswork, no lowball bids followed by change orders. Contact us today to get started.
One of the biggest concerns homeowners have before building an ADU is the permitting process. The city have specific zoning codes and building requirements that must be met for any ADU — and navigating them on your own can be time-consuming and confusing.
At Nick and Sons, we manage the entire permitting process for your Portland, OR ADU. That includes:
You don’t need to become an expert in Portland, OR building code. That’s our job. We handle permits and compliance so you can focus on planning your new space — not the paperwork.
There’s no shortage of contractors in Southwest Washington. So why do homeowners keep choosing Nick and Sons for ADU? It comes down to a few things that matter when you’re investing in a major project.
From design through final inspection, Nick and Sons manages the entire ADU process. You won’t be handed off to subcontractors you’ve never met or left to coordinate between multiple companies. One team, one point of contact, one accountable contractor from start to finish.
We Know Portland, OR
Local knowledge matters in ADU construction. We understand zoning requirements, permit timelines, neighborhood architectural styles, and the Pacific Northwest climate conditions that affect how we build. That expertise shows up in every project we complete.
Transparent Communication — No Surprises
The number one complaint homeowners have about contractors is communication — or the lack of it. At Nick and Sons, we set clear timelines, provide regular updates, and tell you the truth about what’s happening on your project. If something changes, you hear it from us first.
Every ADU starts with a reason. Here are the most common ones we hear from Portland, OR homeowners:
Whatever your reason, Nick and Sons has the experience to help you plan it, permit it, and build it right.
Nick and Sons Design Build is an ADU contractor serving the surrounding Southwest Washington area. We specialize in detached ADUs, attached ADUs, garage conversions, basement conversions, and small space ADUs — for homeowners who want to expand their property without the stress of managing it themselves.
Our team handles everything from the initial consultation through final walkthrough, so you have one point of contact and no surprises mid-project. We show up on schedule, communicate clearly, and don’t consider the job done until your ADU looks and functions exactly as promised.
We offer free estimates with a quick turnaround. Call us at +1 (360) 703-7510 or submit our online form by clicking here.
Request a free, no-obligation quote for your ADU in Portland, OR
We show up, we do the work right, and we build additions that feel like they were always part of your home.
Yes, ADUs require permits and must follow local zoning regulations set by the city. Our team handles the entire permitting process for you, ensuring everything is compliant and approved before construction begins.
The timeline depends on size, design, and permit approvals from the city. On average, most ADU projects take a few months from planning to completion. We provide a clear timeline before starting.
Yes, many homeowners use ADUs as rental units to generate additional income. We design ADUs with functionality and efficiency in mind to maximize their rental potential.
Absolutely. We design every ADU to blend seamlessly with your existing property, both in structure and style, so it feels like a natural extension of your home.
Costs vary based on size, design, and site conditions. After understanding your goals, we provide a detailed estimate so you know exactly what to expect before starting.
Let’s design and build a space that adds value, flexibility, and long-term potential to your property, with a team you can trust from start to finish.