ADU Construction in Bellevue, WA: Trusted DADU Builder for Backyard Cottages and Rental Units

New Day Construction works with Bellevue homeowners planning accessory dwelling units, including attached ADUs, detached ADUs (DADUs), garage conversions, and backyard cottages. If you are comparing ADU builders in Bellevue, our team can help evaluate the site, intended use, design requirements, and construction scope.

Accessory dwelling units (ADUs) can provide additional living space on an existing residential property. New Day Construction serves Bellevue and nearby King County communities with ADU planning and construction.

What Is an ADU or DADU?

There are two unit forms: a detached one (DADU) is like a backyard cottage or an attached one (ADU), sharing a wall with the main house. For Bellevue homeowners key purposes are additional living space, rental purposes, or housing for aging family members. ADU/DADU gives property owners flexibility in living arrangements without the need for a larger property.

Types of ADUs We Build in Bellevue

New Day Construction builds ADUs and DADUs in various formats, with the approach depending on lot size and budget:

• Detached ADUs (DADUs): backyard cottages and standalone units
• Attached ADUs: home additions that expand existing living spaces
• Garage conversions: turning underused garages into livable units
• Basement ADUs: private units with a separate entrance, etc.

Bellevue ADU Rules and the Permit Process

In Bellevue, ADU rules impose various size, zone, and setback limits. New Day Construction manages the permitting process from start to finish, including design and final inspection:

• Size limits (up to 1,000 sq ft or 60% of the main house)
• Zone and setback requirements (vary by lot)
• Parking requirements (vary by ADU type)
• Owner-occupancy rules (for some ADU types)

Cost of ADU Construction in Bellevue

What drives ADU costs? There are several factors, such as type of ADU, size/layout, materials/finishes, and site prep for challenging lots. Detached ADUs typically have higher construction costs than garage or basement conversions, but both types will increase the value of your home over time.

Get a Free Consultation for Your Bellevue ADU Project →

Choosing the Right ADU Builder in Bellevue

Look for an ADU contractor with real local regulations experience. Also, take into consideration a track record of ADUs and DADUs completed nearby and transparent pricing. New Day Construction combines design and build under one roof, which means hiring separate ADU contractors isn't necessary. Homeowners get one point of contact and the same construction services for any future home renovation.

Why Bellevue Homeowners Choose New Day Construction

Bellevue homeowners rely on New Day Construction for quality ADU work, compliant construction, and clear communication on every project:

• Licensed, bonded, and insured under WA contractor license NEWDADC823QR
• Custom ADU design with 3D renderings to suit your home
• Transparent pricing with no hidden costs

And not just ADU work. Our team can do kitchen, bathroom, and even entire home renovations. Just bring us the project, and we handle the rest.

Serving Bellevue and the Eastside

We build ADUs all over Bellevue, WA, and other King County towns like Redmond and Kirkland. 

Frequently Asked Questions

Do I need a permit to build an ADU in Bellevue?

Yes. New Day Construction manages the full permit process, including inspection, to keep your project compliant with Bellevue's construction code.

Can I rent out my ADU?

Rental eligibility and occupancy requirements depend on current Bellevue rules. Property owners should confirm the intended use with the City of Bellevue before construction.

How long does ADU construction take?

Most Bellevue ADU projects take up to 8 months from design to completion, depending on scope and permissions.

What's the difference between an ADU and a DADU?

A DADU is detached from the main home. An attached ADU shares a wall with the existing structure. Both add value to your property.

Ready to Build Your Bellevue ADU?

Contact New Day Construction for a free consultation on your ADU or DADU project in Bellevue, WA.

Request Your Free Consultation → | Call (425) 584-2936