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 Bellevue, WA

← All Bellevue Insurance Restoration Services

Fire Damage Restoration in Bellevue, Washington

Complete Fire & Smoke Damage Restoration in Bellevue — Emergency Response, Insurance Claims, and Full Reconstruction

A house fire turns your life upside down in minutes. Beyond the flames, you’re dealing with smoke damage in every room, water damage from firefighting, structural concerns, and an insurance company that needs to be managed carefully to cover the full scope of repairs. Prolific Design-Build and Restoration handles all of it — from emergency board-up the night of the fire to the final coat of paint on your restored home.

We’re a full-service insurance restoration contractor. That means we don’t just repair fire damage — we manage your entire insurance claim, write Xactimate estimates, meet with your adjuster, file supplements for items they miss, and ensure your Bellevue home is restored to pre-loss condition.

Fire Damage Risks in Bellevue

Bellevue’s mix of high-density downtown condos and large single-family homes across neighborhoods like Somerset, Crossroads, and West Bellevue creates varied fire risk profiles. Electrical fires from aging wiring in older Crossroads and Eastgate homes, kitchen fires in residential areas, and wildfire interface risk along the eastern hillside neighborhoods near Cougar Mountain all contribute to Bellevue’s fire damage landscape.

Our Fire Damage Restoration Services in Bellevue

Our Bellevue fire restoration team handles everything from minor kitchen fires to major structural losses. We coordinate with Bellevue Fire Department investigators, assess structural integrity, and develop a complete restoration plan that addresses fire, smoke, water, and structural damage — all documented for your insurance claim.

  • Emergency Board-Up & Securing — Protect your property from weather, theft, and further damage
  • Smoke & Soot Removal — Professional cleaning of walls, ceilings, HVAC systems, and contents
  • Odor Elimination — Thermal fogging, ozone treatment, and hydroxyl generators
  • Water Damage Mitigation — Address firefighting water damage before mold develops
  • Structural Assessment & Repair — Evaluate and rebuild fire-compromised framing and structural elements
  • Electrical & Plumbing Restoration — Full system inspection, repair, and code-compliant replacement
  • Drywall, Flooring & Paint — Complete interior rebuild and finishing
  • Content Cleaning & Restoration — Professional restoration of salvageable belongings

Fire Damage Insurance Claims in Bellevue

Fire damage claims are complex — they involve structural damage, smoke damage, water damage from firefighting, temporary housing (ALE), content replacement, and code upgrades. Insurance companies frequently underestimate the scope. We ensure nothing is missed.

  • Comprehensive Damage Documentation — Every room, every surface, every affected system photographed and catalogued
  • Xactimate Estimating — Detailed line-item estimates matching insurance industry standards
  • Adjuster Meetings — We walk your adjuster through the full scope of damage on-site
  • Supplement Filing — Hidden smoke damage, code upgrades, and missed items recovered through detailed documentation
  • ALE Coordination — We help document your Additional Living Expenses claim
  • Contents Inventory — Room-by-room inventory of damaged personal property

Bellevue Areas We Serve

We provide fire damage restoration throughout Bellevue including Downtown Bellevue, Crossroads, Factoria, West Bellevue, Eastgate, Newport, Somerset, Lakemont, and Cougar Mountain. Emergency response available 24/7.

Why Prolific Design-Build and Restoration for Fire Restoration in Bellevue?

Fire restoration requires a contractor who can manage every trade — demolition, structural, electrical, plumbing, HVAC, drywall, paint, flooring — and coordinate all of it with your insurance company. That’s our specialty. As an independent contractor, we advocate for you, not the insurance company. Our clients receive higher payouts and better quality repairs because we document thoroughly and refuse to cut corners.

Call (425) 800-4775 for emergency fire damage response in Bellevue, or contact us online. Available 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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