Haas Development and Construction
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Haas Development and Construction is a Seattle-based contractor that has been operating since 2016, bringing a practical, hands-on approach to ADU and DADU construction across the Puget Sound region. The company holds Washington contractor license number HAASDDC842QA and operates a dual-track service model: it provides full-service DADU construction alongside a custom cabinetry shop in Seattle that crafts bespoke millwork and cabinetry for residential projects. By combining construction with an in-house cabinetry operation, Haas is able to deliver custom woodworking and finish work that many general contractors must outsource or source from cabinet suppliers. The company serves Seattle, Edmonds, Lake Forest Park, Shoreline, Lynnwood, Bellevue, Kirkland, Redmond, Sammamish, Issaquah, and surrounding communities throughout the greater Puget Sound region, indicating broad geographic coverage and established relationships with planning departments across multiple jurisdictions.
Haas Development's approach to DADU construction emphasizes prefabricated floor plans that have been pre-approved by the City of Seattle. Rather than designing every DADU from scratch, the company has worked with the city to pre-approve a set of plans that meet Seattle's code, permitting, and design guidelines. When a homeowner in Seattle or a nearby jurisdiction selects one of these pre-approved plans, the permitting process is substantially shortened because the city has already vetted the design and confirmed compliance. This approach is particularly valuable for homeowners who want predictability in their timeline and cost, because pre-approved plans eliminate the back-and-forth revision cycle that can extend permitting timelines by months. Homeowners who need a fully custom design outside the pre-approved plans can still work with Haas, but they should expect a longer permitting timeline and potentially higher design fees to develop and shepherd that custom design through city approval.
The construction process with Haas Development unfolds through planning, permitting, design, and construction phases. During planning, the Haas team reviews the homeowner's lot, intended use of the DADU, budget, and timeline to ensure alignment and feasibility. The company can then recommend one of its pre-approved plans or discuss the path to a custom design. Once a plan is selected, the company prepares permitting documents and coordinates submissions with the city. Unlike some builders that hand off permitting to a third-party expeditor, Haas handles city coordination directly, giving the company control over timing and communication. After permits are issued, the construction phase begins with site preparation, foundation, framing, and all mechanical and finish work. The company coordinates trades and maintains the construction schedule to ensure the project stays on track. Once the unit is framed and mechanically rough, the Haas cabinetry shop can step in to craft custom cabinetry, built-ins, or millwork that brings distinctive details and superior finishes unavailable in off-the-shelf solutions. Final inspections and a Certificate of Occupancy complete the process.
A completed Haas DADU project exemplifies the firm's capabilities: a two-story, 1,000 square foot Seattle DADU featuring full kitchen, bathroom, bedrooms, and living space. This project demonstrates that Haas has the crew depth and skill to execute full-scale DADUs with all the complexity of utility connections, permitting coordination, and multi-phase construction. The company's portfolio also includes custom kitchen and bathroom remodels, full home remodels, and cabinetry work, indicating that it draws on the same crew and vendor relationships for each project type. This depth of portfolio and experience reduces risk for homeowners, because Haas is not a one-project-type contractor, but rather a full-service builder that can integrate DADU work into a broader home improvement strategy.
Haas Development does not publish pricing on its website, instead offering estimates based on the specific plan selected and the project scope. Pre-approved plans are less expensive and faster to permit than custom designs, but pricing depends on factors including site conditions, utility access, foundation requirements, and finish selections. Homeowners interested in Haas should contact the company directly at 206.494.3369 or info@haasbuilding.com to discuss their project, request details on the pre-approved plans, and receive a custom estimate. The company's ten-year track record and Seattle base provide confidence that pricing will reflect current market rates and that the firm understands the specific permitting and code environment in the cities it serves.
Haas Development's competitive position rests on several distinct strengths compared to other Eastside and Seattle DADU builders. First, the pre-approved plans with the City of Seattle represent a significant permitting advantage, because homeowners can sidestep the design review and revision cycles that plague custom designs. Second, the in-house cabinetry shop allows Haas to deliver custom finishes and millwork without outsourcing, which translates to better control over quality, aesthetics, and scheduling. Third, the company's ten-year tenure in the market and its diverse portfolio (DADUs, remodels, custom cabinetry, custom homes) signal that it has weathered market cycles and retained a stable crew. Some competitors focus exclusively on DADUs and may have higher volume; Haas's broader service mix means slightly lower specialization but also access to deeper construction expertise and a more diversified business model.
Haas Development and Construction is best suited for homeowners in Seattle and the surrounding Puget Sound region who want to build a DADU and value a shorter permitting timeline through pre-approved plans. Homeowners in Seattle particularly benefit from Haas's relationship with the city and its pre-approved design library. Owners who care about custom cabinetry and bespoke finishes will appreciate Haas's in-house woodworking capability, because it allows the company to craft built-ins and millwork that stock cabinets cannot deliver. Homeowners who want to see a completed, full-scale DADU example before committing should request the details on the two-story, 1,000 square foot Seattle project, because it demonstrates Haas's execution quality and attention to detail. The company's willingness to also handle custom home remodels and kitchen and bathroom work also makes it a good fit for homeowners who are bundling a DADU with concurrent improvements to the primary residence.
Haas Development and Construction has built a solid regional presence through a combination of pre-approved DADU plans, in-house cabinetry expertise, and a diverse portfolio spanning new construction and remodels. For Seattle-area homeowners who want to accelerate their DADU permitting process and access custom finish work from a single contractor, Haas represents a knowledgeable and capable choice.