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.

Storm Damage Repair Bellevue, WA

← All Bellevue Insurance Restoration Services

Storm Damage Repair in Bellevue, Washington

24/7 Emergency Storm Damage Response in Bellevue — We Handle Your Insurance Claim From A to Z

When a storm hits your Bellevue home, the damage can be overwhelming — torn shingles, broken siding, water pouring through your ceiling, fallen trees on your roof. You need a contractor who shows up fast, stops the damage from getting worse, and knows how to get your insurance company to pay for every dollar of repairs you’re entitled to. That’s exactly what Prolific Design-Build and Restoration does.

We’re not just a repair crew. We’re a full-service insurance restoration contractor that handles your entire storm damage claim from the first phone call to the final inspection. We document the damage, write Xactimate estimates, meet with your adjuster, file supplements for hidden damage, and complete every repair to pre-loss condition.

Why Bellevue Homes Are Vulnerable to Storm Damage

Bellevue’s position between Lake Washington and the Cascade foothills channels Pacific storms through the city. High winds funnel through the I-405 corridor, and elevated Somerset and Cougar Mountain neighborhoods take the brunt of hail and wind-driven rain.

Common Storm Damage We Repair in Bellevue

We regularly repair wind-lifted shingles across Crossroads, replace hail-damaged siding in Factoria, and address water intrusion from ice dams in Somerset and Lakemont hillside homes. Mature trees create additional risk for roof strikes during windstorms.

Our Storm Damage Repair Services

  • Emergency Board-Up & Tarping — Property secured within hours
  • Roof Repair & Replacement — Missing shingles to full tear-off
  • Siding Repair & Replacement — Wind, hail, and impact damage
  • Gutter & Downspout Repair — Crushed, detached, blocked systems
  • Window & Door Replacement — Broken glass, warped frames
  • Water Damage Mitigation — Extraction, drying, mold prevention
  • Fallen Tree & Debris Removal — Safe removal, structural assessment
  • Interior Damage Repair — Drywall, ceiling, flooring, paint

How We Handle Your Insurance Claim

Most Bellevue homeowners have never filed a storm damage claim. Insurance companies know this and use it to minimize payouts. We level the playing field.

  • Free Storm Damage Inspection — Photos, measurements, detailed documentation
  • Xactimate Estimate — Industry-standard software your insurer uses
  • Claim Filing Assistance — Avoid mistakes that delay claims
  • Adjuster Meeting — We walk through every line item on-site
  • Supplement Filing — Recover money for hidden damage
  • Complete Restoration — Every repair from roof to foundation

Bellevue Neighborhoods We Serve

We serve all of Bellevue including Downtown Bellevue, Crossroads, Factoria, West Bellevue, Eastgate, Newport, Somerset, Lakemont, and Cougar Mountain. Emergency response within 1-2 hours.

Why Choose Prolific Design-Build and Restoration?

As an independent contractor, we work for you — not the insurance company. Our clients receive higher payouts because we document thoroughly and fight for every dollar. Washington law gives you the right to choose your own contractor.

Call (425) 800-4775 for a free storm damage inspection in Bellevue. Emergency services 24/7.

Related Resources

Dealing with storm damage? We're here — call now or submit your info and we'll call you within the hour.

We Got Your Request

We respond within 2 business hours — same day for emergencies.

A member of our team will reach out shortly to schedule your free estimate or inspection. Here's what to have ready when we call:

What to Have Ready

  • Photos of the damage or area of concern (phone photos are fine)
  • Your insurance carrier name and claim number (if applicable)
  • Best time and number to reach you
  • A rough idea of when the damage occurred or project timeline
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Prolific Design-Build & Restoration — Federal Way, WA

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