ADU & DADU Contractor — King County, WA

Add a Legal Dwelling Unit
to Your King County Property

From permit application to final walkthrough — Prolific handles design-build ADU and DADU projects across Federal Way, Issaquah, Renton, Kent, and greater King County.

$180KAverage ADU Cost (King County)
6–12moTypical Timeline Permit to Move-In
$1,800+Monthly Rental Income Potential
3–5yrAverage ROI Payback Period

What We Build

Every ADU project is custom-designed for your lot, your goals, and King County code.

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Detached ADU (DADU)

A standalone dwelling in your backyard. Most flexible for rental or multigenerational living. Requires setback compliance and separate utility connections.

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Attached ADU

Connected to the primary home via a shared wall. Lower cost than detached, faster permitting. Ideal for in-law suites or long-term rental income.

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Junior ADU (JADU)

Converted from existing interior space — garage, basement, or bonus room. Lowest cost entry point. Limited to 500 sq ft per King County code.

The King County Permitting Process

Prolific handles every step. Most homeowners have never pulled a permit — we've done hundreds.

1

Site & Zoning Review

We verify your parcel's zoning, setbacks, lot coverage, and utility capacity before design starts. Catches 80% of project-killers on day one.

2

Design & Engineering

Architectural plans drawn to King County standards. Structural engineering included where required. Typical design phase: 3–6 weeks.

3

Permit Submission

We submit to King County DPER or the applicable city (Federal Way, Renton, Issaquah, Kent). Electronic submission with full plan set.

4

Review & Corrections

County review typically takes 6–12 weeks. We respond to all correction requests and manage the back-and-forth until permit issuance.

5

Build & Final Inspection

Construction with milestone inspections. Final inspection and certificate of occupancy required before the unit can be rented or occupied.

Cost Ranges for King County ADUs

Rough estimates — every project varies by site, size, and finish level. Free estimate available after a site visit.

ADU TypeSize RangeTypical Cost Range
Junior ADU (JADU)Up to 500 sq ft$60,000 – $120,000
Attached ADU400–800 sq ft$120,000 – $200,000
Detached ADU (DADU)400–1,200 sq ft$160,000 – $320,000

Ready to Add a Unit to Your Property?

Free site consultation. We'll tell you what's possible on your lot before you spend a dollar.

Get Your Free ADU Estimate

Prolific's Differentiator

While We're Restoring Your Home, Let's Make It Better Than Before

Most contractors patch the damage and leave. We use the restoration as a launchpad — pairing insurance coverage with a remodel that upgrades what you had.

Storm + Remodel

Federal Way — Hail Damage + Kitchen Upgrade

Insurance covered the roof and siding. While we had the crew on-site, the homeowners financed a kitchen remodel they'd been putting off for years. One mobilization, two wins.

Water + Addition

Renton — Burst Pipe + Primary Bath Expansion

A burst pipe triggered an insurance claim for the subfloor and drywall. We rebuilt the bathroom larger than it was — same timeline, carrier paid the base, owner paid the delta.

Fire + Rebuild

Issaquah — Garage Fire + ADU Conversion

Garage total loss became a permitted two-car garage with a studio ADU above. Insurance rebuilt what burned. The ADU now generates rental income to offset the mortgage.

Insurance Claim? We Handle Everything.

Your Insurance Company Has Adjusters.
Now You Have Us.

STORM DAMAGE RESPONSEthousands more for homeowners just like you.

Kitchen Remodeling in Issaquah, Sammamish & Bellevue: Costs, Trends, and What to Expect in 2026

Planning a Kitchen Remodel on the Eastside?

A kitchen remodel is one of the highest-return investments you can make in your home — and here in Issaquah, Sammamish, and Bellevue, homeowners are investing in kitchens that blend modern functionality with Pacific Northwest style. Whether you’re updating a dated layout or doing a full gut renovation, understanding costs, timelines, and local trends will help you make smart decisions.

At Prolific Design-Build and Restoration, we handle kitchen remodels from concept to completion — including design, permitting, demolition, structural work, plumbing, electrical, cabinetry, countertops, and finishing touches. As a licensed and insured contractor serving King County, we bring the same precision to remodeling that we bring to insurance restoration projects.

What Does a Kitchen Remodel Cost in King County?

Kitchen remodel costs in the greater Seattle and Eastside area vary widely depending on scope, materials, and layout changes. Here’s a general breakdown for 2026:

Minor kitchen refresh ($25,000–$45,000): New cabinet fronts, countertops, backsplash, fixtures, and paint. The existing layout stays the same, and no walls are moved.

Mid-range kitchen remodel ($50,000–$90,000): Custom or semi-custom cabinetry, quartz or granite countertops, new appliances, updated lighting, and possible layout tweaks. This is the most popular range for Eastside homeowners.

High-end kitchen renovation ($100,000–$200,000+): Structural changes like removing walls, relocating plumbing and gas lines, premium appliances (Sub-Zero, Wolf, Thermador), custom cabinetry, large islands, and luxury finishes throughout.

Permitting in Issaquah, Sammamish, and Bellevue typically adds $500–$2,000 depending on the scope of work. Structural, plumbing, and electrical changes all require permits — and working with a contractor who handles permitting ensures you stay code-compliant.

Top Kitchen Remodeling Trends for 2026

Eastside homeowners are gravitating toward designs that prioritize both aesthetics and functionality:

Open-concept layouts continue to dominate, with kitchen islands serving as the central gathering point. Many homeowners are removing walls between kitchens and living areas to create seamless entertaining spaces.

Warm, natural tones are replacing the all-white kitchen trend. Think warm wood cabinetry, earthy stone countertops, and matte brass or black hardware. Pacific Northwest homeowners especially love incorporating natural materials.

Smart storage solutions including pull-out pantry systems, drawer organizers, and appliance garages help maximize every inch — especially important in older Issaquah and Sammamish homes where kitchen footprints may be smaller.

Integrated smart home features such as touchless faucets, under-cabinet lighting controls, and smart appliances are becoming standard in higher-end remodels.

Kitchen Remodel Timeline: What to Expect

A typical mid-range kitchen remodel in King County takes 8–14 weeks from demolition to completion. Here’s a rough timeline:

Weeks 1–2: Demolition and rough framing. If walls are being moved or removed, structural engineering and framing happen here.

Weeks 3–5: Rough plumbing, electrical, and HVAC work. Inspections happen at this stage.

Weeks 6–8: Drywall, painting, flooring installation, and cabinet installation.

Weeks 9–12: Countertop fabrication and install, backsplash, appliances, fixtures, and final details.

Weeks 13–14: Final inspections, punch list items, and project completion.

Delays can happen due to material lead times (custom cabinetry often takes 6–10 weeks to fabricate), permit processing, or discovery of hidden issues like water damage or outdated wiring — which is where our insurance claims expertise becomes a real advantage.

Why Choose a Design-Build Contractor?

The design-build model — where one company handles both design and construction — streamlines communication, reduces costs, and keeps your project on schedule. Instead of coordinating between a separate designer, architect, and general contractor, you have a single point of contact managing everything.

At Prolific Design-Build and Restoration, our team coordinates all trades in-house: demolition, framing, plumbing, electrical, cabinetry, tile, and finishing. We also handle all permits and inspections with the City of Issaquah, City of Sammamish, and City of Bellevue building departments.

If your kitchen has existing damage — water damage under the sink, mold behind cabinets, or outdated electrical — we can address those issues as part of the remodel and even help you file an insurance claim if the damage is covered.

ADU Kitchens and Accessory Dwelling Units

Building an ADU or DADU? The kitchen is often the most complex part of an accessory dwelling unit build. We design and build efficient, code-compliant ADU kitchens that maximize functionality in compact spaces — a specialty that’s increasingly important as Issaquah and Sammamish expand ADU-friendly zoning.

Get a Free Kitchen Remodel Estimate

Ready to transform your kitchen? Prolific Design-Build and Restoration offers free in-home consultations and detailed estimates for kitchen remodels in Issaquah, Sammamish, Bellevue, Renton, and throughout King County.

Call us at (425) 800-4775 or request a free estimate online. As a Black-owned and Latino-owned business, we’re committed to delivering 5-star craftsmanship and transparent communication on every project.

Related reading: Why High-Value Homes in King County Need Specialized Insurance Restoration | Storm Damage Restoration on the Eastside

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Prolific Design-Build & Restoration — Federal Way, WA

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