ADU Building Company in Seattle, Washington

An Accessory Dwelling Unit (ADU) isn’t just an extra building — it’s a smart way to create more room for the people and moments that matter. Whether you’re thinking of a cozy backyard cottage, a space for aging parents, or a modern rental unit, an ADU gives you flexibility, comfort, and long-term value.
At DM Construction Group, we design and build ADUs that blend perfectly with your main home — both in look and in lifestyle. For over 15 years, we’ve helped Seattle homeowners add functional, beautiful spaces that feel like home from day one. Every project we take on is personal, built with care, precision, and pride.

TURN A HOME INTO YOUR SPACEExpanding Space, Building Possibilities

Seattle homes have their own character, and so should yours. Our ADU builders know how to make the most of every yard, slope, and lot — creating spaces that look natural and work beautifully year-round.

From the first conversation, we listen to what you need: space for guests, family, or an extra income stream. Then we handle everything — design, permits, construction, and finishing. You’ll always know what’s happening and when.

Whether it’s a granny flat, a backyard studio, or a modern DADU, we make the entire process simple, clear, and exciting.

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Our advantages

Our process

Step 1
Consultation. We start with a friendly chat about your vision, budget, and how you plan to use the space.
Step 2
Design & Planning. Our ADU contractors create detailed layouts, timelines, and permit-ready plans that fit your property perfectly.
Step 3
Construction. Once approved, we bring your ADU to life — handling every stage from foundation to final paint.
Step 4
Final Stage. We walk through every corner with you to make sure it looks amazing and feels just right.

Our portfolio

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WHAT ABOUT YOUR PROJECT?Project related questions

How long does it take to build an ADU?

Most projects take about three to six months, depending on size, design, and permits. We’ll give you a clear schedule from the start.

Can I rent my ADU after it’s finished?

Yes! Seattle allows homeowners to rent their ADUs once approved, giving you an extra source of income.

Do you handle permits and city approvals?

Absolutely. Our ADU construction company takes care of all the paperwork, inspections, and final sign-offs.

Can you convert my garage or basement into an ADU?

Definitely. Our team also specializes in ADU remodeling, transforming existing structures into stylish, livable spaces.

Let’s Build TogetherFiil the form

Your backyard has more potential than you might think. With DM Construction Group, you get a team that listens first, plans carefully, and builds with genuine care.
We’ve become one of Seattle’s most trusted ADU home builders because we believe in honesty, craftsmanship, and homes that simply make life better.
So whether you’re dreaming of a small guest suite or a sleek rental unit, we’ll help make it real — beautifully and stress-free.
Contact us today to start your ADU journey and see what your property can become.


    ADU Building Company in Seattle, Washington

    An Accessory Dwelling Unit, or ADU for short, is an additional living space built adjacent to the main home. This type of housing is becoming increasingly popular in Seattle and the surrounding suburbs.

    In fact, an ADU is a versatile solution. It helps increase living space, increase property value, and, incidentally, create a source of additional income.

    Options vary, including granny flat construction, backyard cottages, and modern designs from ADU manufacturers. Surprisingly, interest in such structures is growing not only among investors but also among families seeking comfortable space for parents or adult children.

    Why Homeowners Look for ADU Builders Near Me

    Local contractors are especially trusted. This is because they are more familiar with city regulations, respond more quickly to requests, and take into account the specifics of a particular neighborhood. This makes it easier for the client to communicate and monitor the process.

    Indeed, proximity to the company plays a significant role, particularly in regular meetings and approvals. Seattle has no shortage of ADU builders, and homeowners usually decide who to work with by looking at their budget, schedule, and the kind of outcome they want.

    Main Services Offered by Contractors

    The construction of an accessory dwelling unit involves more than just installation and finishing. Design and documentation preparation are also crucial. Many accessory dwelling unit builders offer a full range of services.

    Here's a list of services most often included in the package:

    • ADU design and planning;
    • code and code consultations;
    • assistance with ADU permitting and inspections;
    • construction of additions or separate buildings;
    • interior and exterior finishing;
    • utilities and utilities.

    This comprehensive approach allows the homeowner to avoid unnecessary worries and achieve the finished product within the agreed-upon timeframe.

    ADU Project Implementation Stages

    Construction of accessory dwelling units involves several mandatory steps. First, property owners contact ADU contractors. The contractors then conduct a site assessment and discuss the project's feasibility. Next come design and cost estimates.

    Construction begins after approval, with small home builders and secondary dwelling unit contractors playing active roles. The specific services required and the desired result will determine the approach.

    Quality control and adherence to deadlines are crucial. For a reliable result, it is essential to complete all steps consistently.

    On average, construction takes three to six months. This depends on the project's complexity, the materials chosen, and the site's readiness. Regardless, a pre-agreed schedule allows clients to plan for family and financial matters.

    Popular Types of Accessory Dwelling Units

    Demand for ADUs in Seattle varies. Some want to build a compact cottage or a backyard addition, while others are looking to renovate a granny flat. In any case, the search begins with the query “ADU builders near me”.

    Analyzing recent customer requests, it's clear that they often request the following options:

    • separate backyard cottage for rent;
    • granny flat for parents to live in;
    • modular solution from manufacturers;
    • secondary dwelling unit with a garage;
    • compact apartment for guests;
    • small studio for students.

    The choice depends on your goals: additional income, expanding family space, or an investment in the future. Specialists, in turn, can provide professional recommendations to optimize your design.

    The Role of Design and Planning

    Without thorough preparation, successful construction is impossible. Design and planning help to consider every detail in advance, from location to utility connections. This may seem obvious, but it's at this stage that key decisions are made.

    ADU construction company provides consultations and visualizations, making the choice easier. Truth be told, a high-quality design saves time and money in subsequent stages. Therefore, it's better to spend a little more time on the preparation stage. But then, you'll be confident that everything will turn out perfectly.

    Benefits of Working with Local Companies

    A local ADU company understands the region's unique legal and climatic conditions. Indeed, such contractors are familiar with the best materials for Seattle's rainy climate. At the same time, backyard cottage builders help quickly pass official inspections and obtain permits.

    One example of a local contractor is DM Construction Group. The company’s been operating for over 15 years, taking on projects of all sizes. That kind of experience, combined with local know-how, makes the whole building process much smoother.

    What to Look for When Choosing a Contractor

    The contractor market is all over the place, and homeowners need to look at more than just the price. Experience and being upfront really matter more. If a company offers ADU construction services, you should inquire about their completed projects. You should also request examples of their work.

    Here are some key factors to consider when making your decision:

    • company experience in the market;
    • examples of completed projects;
    • transparency of estimates and timelines;
    • licenses and insurance;
    • testimonials from real clients;
    • understanding of local regulations.

    This approach ultimately reduces risks and helps you find a reliable partner who will deliver a high-quality project on time and with guarantees.

    Opportunities for Remodeling and Additions

    It isn't always necessary to construct a new home. Sometimes ADU remodeling and additions are the easier route, letting you upgrade an existing space or expand your home without starting from scratch. In many cases, remodeling is more cost-effective than building from scratch.

    This option is chosen by families who want to preserve the architecture of their primary home while gaining additional space. On the other hand, additions offer the flexibility to adapt a home to new needs.

    How the Seattle ADU Market Is Developing

    The demand for accessory dwelling units in the region is steadily increasing. This is driven by high land values, rental demand, and families' desire to maximize the efficiency of their properties. Technological advances and the emergence of modular ADU manufacturers have naturally made the process more accessible.

    DM Construction Group and other local contractors demonstrate that the market is gradually evolving around versatile solutions. As a result, homeowners have more choices, and the city is enjoying new, modern living spaces.

    Trends and Development Prospects

    Looking ahead, we see that ADU construction in Seattle is becoming an integral part of the urban environment. Residential density is increasing, while demand for housing remains strong. In the near future, accessory dwelling units are likely to appear on almost every other property.

    City officials are also supporting this trend. They are simplifying the permitting process and even offering programs for homeowners. This type of housing is becoming increasingly energy-efficient, which reduces family costs and helps the environment.

    Conclusion

    Accessory dwelling unit construction in Seattle has become an essential trend in the housing sector. This approach opens up opportunities for renting, expanding families, or increasing home value. Choosing reliable ADU home builders is crucial, as the quality, timeliness, and reliability of the project depend on them.

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