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.

Emergency Roof Repair — King County, WA | 24/7 Response

Emergency Roof Repair — King County, WA | 24/7 Response

When your roof is damaged and water is coming in, you need help now — not tomorrow. Prolific Design-Build and Restoration provides 24/7 emergency roof repair throughout King County. We respond quickly to secure your home, stop active leaks, and prevent further damage to your property.

Immediate Emergency Response

Call (425) 800-4775 any time — day or night, weekends and holidays included. When you call for an emergency, here’s what happens:

  1. Rapid dispatch — Our emergency crew heads to your location immediately
  2. Emergency tarping and board-up — We stop water intrusion and secure exposed areas
  3. Water mitigation — We address any active water entering your home to prevent mold and structural damage
  4. Damage documentation — We photograph and document everything for your insurance claim while securing the property
  5. Permanent repair plan — We provide a detailed scope of work for the full repair or replacement

Common Emergency Roof Situations We Handle

  • Tree falls on roof — Removal of tree/debris, structural assessment, emergency tarping, and full repair
  • Active roof leak during storm — Interior water mitigation, emergency patching, and permanent repair
  • Wind blows off shingles or sections — Emergency tarping and shingle replacement
  • Hail punches through roofing — Assessment, tarping, and insurance-covered replacement
  • Ice dam causing interior water damage — Ice removal, leak sealing, and ice dam prevention
  • Chimney or vent damage — Emergency sealing and flashing repair

We Handle Your Insurance Claim

Emergency roof damage is almost always covered by homeowners insurance. We document the damage during our emergency response and help you file your claim immediately. Our documentation meets insurance industry standards, and we coordinate directly with your adjuster to ensure your claim covers the full scope of repairs needed.

You pay only your deductible. We handle everything else — the paperwork, the adjuster meetings, the repairs, and the final inspection.

Why Response Time Matters

Every hour that a damaged roof goes unprotected, the damage multiplies. Water entering through a compromised roof can damage insulation, drywall, electrical wiring, flooring, and personal belongings. Within 24-48 hours, mold can begin growing in wet building materials. The longer you wait, the more expensive the repair becomes — and your insurance company may not cover secondary damage caused by delayed response.

When you call Prolific Design-Build and Restoration, we treat your emergency like our own. We arrive prepared with emergency tarping materials, tools, and equipment to secure your home on the first visit.

After the Emergency: Full Restoration

Emergency tarping is a temporary fix. Once your home is secured, we work with your insurance company to complete permanent repairs. Whether you need a section of shingles replaced, new flashing installed, or a complete roof replacement, we handle the full restoration using premium materials backed by manufacturer warranties.

We also address any secondary damage caused by water intrusion — including drywall repair, insulation replacement, interior painting, and mold remediation. One contractor, one point of contact, one insurance claim.

Serving All of King County — 24/7

Our emergency response covers all of King County including Issaquah, Bellevue, Sammamish, Renton, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, Covington, Enumclaw, Black Diamond, and surrounding areas.

Roof Emergency? Call Now

Call (425) 800-4775 for immediate emergency roof repair. We respond 24/7, 365 days a year. We’ll secure your home, document the damage for your insurance claim, and restore your roof to pre-damage condition.

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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