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.

Fire Damage Restoration King County WA

Frequently Asked Questions

What should I do immediately after a house fire?

First, ensure everyone is safe and the fire department has cleared the property. Then call your insurance company to report the claim, and contact a restoration contractor like us before re-entering. Soot and smoke can cause ongoing damage every hour.

Does insurance cover fire damage restoration?

Yes — fire damage is one of the most commonly covered insurance perils. Most homeowner policies cover structural repair, smoke/soot cleanup, odor removal, and temporary housing. We work directly with your insurer to maximize your claim.

How long does fire damage restoration take?

Minor fire damage can be restored in 1–2 weeks. Major structural fires can take 3–6+ months for full rebuild. We provide a detailed timeline after our initial assessment and keep you informed throughout.

Can smoke and soot damage be fully removed?

Yes. Professional smoke and soot removal uses industrial-grade equipment including thermal fogging, ozone treatment, and HEPA air scrubbing. DIY cleaning often spreads soot and makes it worse — professional restoration is essential.

Do you handle both structural and content restoration?

We specialize in structural restoration — framing, drywall, roofing, siding, flooring, and painting. For content (furniture, electronics, clothing), we can recommend certified contents restoration partners in King County.

Get a Free Estimate Today

Serving all of King County — available 24/7 for emergencies.

📞 (425) 800-4775Contact Us Online

Cities We Serve

IssaquahRentonBellevue

Complete Fire Damage Restoration — King County, WA

Fire damage is devastating, but recovery is possible. Prolific Design-Build and Restoration provides complete fire damage restoration for King County homeowners — from emergency board-up and smoke remediation to full structural rebuild and interior finishing. We handle the entire insurance claims process so you can focus on your family while we restore your home.

Full-Scope Fire Damage Services

Emergency Securing & Board-Up

After a fire, your home is vulnerable to weather, theft, and additional damage. We provide immediate board-up and tarping to secure the property. This emergency response is documented for your insurance claim and typically covered in full.

Smoke & Soot Damage Cleaning

Smoke travels far beyond the fire area, leaving soot residue and odor throughout your home. We clean and deodorize affected surfaces, HVAC systems, and contents. Different types of smoke (wet, dry, protein, fuel) require different cleaning approaches, and our team uses the right methods for each situation.

Water Damage from Firefighting

The water used to extinguish a fire often causes significant secondary damage — soaked drywall, waterlogged insulation, damaged flooring, and potential mold growth. We provide complete water mitigation and drying as part of the fire restoration process.

Structural Repair & Rebuild

Fire can compromise framing, roofing, load-bearing walls, and foundation elements. Our team assesses structural integrity, removes damaged materials, and rebuilds to current building codes. We handle framing, roofing, siding, windows, doors, drywall, flooring, painting, and trim — the complete rebuild.

Odor Removal

Smoke odor penetrates deep into building materials, furniture, and personal belongings. We use professional-grade ozone treatments, thermal fogging, and hydroxyl generators to eliminate odor at the molecular level — not just mask it.

Insurance Claims for Fire Damage

Fire damage claims are among the most complex insurance claims a homeowner can file. The damage spans multiple systems (structural, mechanical, electrical, cosmetic), involves secondary damage (water, smoke, mold), and requires detailed documentation at every stage. We’ve managed numerous fire damage claims and know how to document the full scope so nothing is missed.

We coordinate with your insurance adjuster through every phase, file supplements for additional damage discovered during restoration, and ensure your claim covers the true cost of returning your home to pre-fire condition.

Serving All of King County

We provide fire damage restoration throughout King County including Issaquah, Bellevue, Sammamish, Renton, Kirkland, Redmond, Kent, Auburn, Federal Way, Maple Valley, Covington, Enumclaw, Black Diamond, and surrounding communities.

Need Fire Damage Restoration?

Call (425) 800-4775 for immediate emergency response and a free damage assessment. We’ll secure your home, document the damage, and guide you through the insurance process. We understand how overwhelming fire damage is — let us handle the restoration while you focus on recovery.

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

📋 Get a Free Estimate