New Day Construction — ADU Builder Serving Bellevue and the Greater Seattle Area
New Day Construction is a licensed ADU contractor based in the Bellevue area, specializing in the design and construction of accessory dwelling units for homeowners across Bellevue, Redmond, and the greater Seattle region. With over 21 years of combined industry experience and more than 250 completed projects, they offer a range of ADU types suited to different property sizes, budgets, and goals.
Their services cover the full spectrum of ADU construction, including detached ADUs, attached ADUs, garage conversions, basement ADUs, above-garage units, and custom ADU designs. Whether a homeowner is looking for a backyard cottage, an in-law suite, or a converted garage apartment, New Day Construction handles the project from initial consultation through to completion.
New Day Construction is licensed, bonded, and insured, operating in compliance with Washington State regulations. Their Washington State Contractor License number is NEWDADC823QR.
Types of ADUs New Day Construction Builds
Every property is different, and New Day Construction tailors their ADU designs accordingly. The types of accessory dwelling units they build include:
- Detached ADUs: Stand-alone backyard cottages or small homes with full kitchens, bathrooms, and living areas — suitable for rental use or guest accommodation.
- Attached ADUs: Home additions that expand existing living space while integrating with the current structure.
- Garage Conversions: Transforming underused garages into functional studios, apartments, or in-law suites.
- Basement ADUs: Converting basements into private living spaces with independent entrances.
- Above-Garage Units: New living spaces built above garages or carports, a practical option for smaller lots.
- Custom ADU Designs: Personalized floor plans with premium finishes and energy-efficient features.
For each project, their design team produces detailed 3D renderings and floor plans, giving homeowners a clear picture of the finished unit before construction begins.
Building an ADU in Bellevue involves navigating local zoning and permitting requirements. New Day Construction manages the entire permitting process with the City of Bellevue, handling compliance with size limits, setback and height rules, parking requirements, and owner-occupancy conditions where applicable. Bellevue generally allows ADUs up to 1,000 square feet or 60% of the primary home's size, whichever is smaller.
ADU Construction Costs and Process
The cost of building an ADU in Bellevue typically ranges from $150,000 to $350,000, depending on the type, size, materials, and site conditions. Factors that influence the final cost include:
- ADU type — detached units generally cost more than garage conversions or basement ADUs
- Size and layout complexity
- Choice of materials and finishes
- Site preparation needs, such as sloped terrain
New Day Construction provides itemized estimates during the initial consultation, so homeowners have a clear understanding of projected costs before committing to a project.
Their construction process follows a structured sequence: a free in-home consultation, custom design and permitting, construction, and a final walkthrough. All work is backed by a warranty, and the team maintains clean job sites throughout the build.
Most ADU projects in Bellevue take between 4 and 8 months from design to completion, depending on the scope of work and permitting timelines. New Day Construction serves homeowners throughout Bellevue, Redmond, and the broader Seattle Eastside area.
