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 in King County: Fast Response When It Matters Most

A compromised roof in King County isn’t a problem that can wait until Monday morning. With an average of 152 rainy days per year and wind events that regularly exceed 50 mph during fall and winter storms, a damaged roof turns into interior water damage, ruined insulation, and potential mold growth in a matter of hours. Here’s what King County homeowners need to know about emergency roof repair and how to protect their property when the unexpected happens.

Signs You Need Emergency Roof Repair

Some roof damage is obvious — a tree limb punching through shingles leaves no room for debate. But other signs require attention before they escalate. Water stains appearing on ceilings or walls during rain indicate active leaks that will worsen with every storm. Missing or lifted shingles visible from ground level mean your roof deck is exposed to moisture. Sagging sections of roofline suggest structural compromise that could lead to collapse under additional load from rain or debris.

If you hear the sound of dripping water in your attic or see daylight through roof boards, you need emergency service — not a scheduled appointment next week.

What Happens During Emergency Roof Repair

Emergency roof repair is about stabilization, not permanent restoration. The goal is to stop the bleeding — prevent water intrusion and further structural damage until a full repair or replacement can be performed under controlled conditions.

Our emergency crews install heavy-duty polyethylene tarps secured with 2×4 furring strips fastened directly to the roof deck. This isn’t the blue-tarp-and-sandbag approach you see on DIY videos — our tarping system withstands sustained Pacific Northwest weather because it’s mechanically fastened, not weight-dependent.

For localized damage like missing shingles or small punctures, we can often perform temporary patches using roofing cement and replacement materials that provide a weather-tight seal until permanent repair is scheduled.

Common Causes of Roof Emergencies in King County

Our region’s climate and tree coverage create specific roof emergency patterns. Wind damage during fall and winter storms strips shingles, lifts flashing, and exposes the roof deck to rain. Fallen trees and branches from the towering evergreens throughout Bellevue, Kirkland, Redmond, and Issaquah neighborhoods are responsible for the most dramatic roof damage we see. Ice dams during cold snaps — while less common than in eastern Washington — can back water under shingles and into attics. Aging roofs that have exceeded their service life are particularly vulnerable, and many King County homes built in the 1970s-1990s still have original composition roofing well past its warranted lifespan.

Emergency Roof Repair and Your Insurance Claim

Emergency tarping and temporary repair are considered mitigation under your homeowner’s insurance policy — meaning these costs are covered separately from your main repair claim. This is important: your policy requires you to mitigate further damage, and the cost of doing so is reimbursable.

We document all emergency repairs with timestamped photos, material records, and detailed descriptions of the work performed. This documentation supports your insurance claim and demonstrates compliance with your policy’s mitigation requirements.

From Emergency Repair to Full Roof Replacement

Once your property is stabilized, Prolific transitions seamlessly from emergency response to permanent repair or full roof replacement. As a licensed general contractor and design-build firm, we handle the complete scope — from pulling permits with King County to selecting materials, performing the installation, and passing final inspection. No need to find a second contractor or start the vetting process over again while your roof has a tarp on it.

Call Prolific for Emergency Roof Repair

When your roof is compromised, every hour matters. Call Prolific Design-Build and Restoration at (425) 800-4775 for 24/7 emergency roof repair across King County. We respond fast because we understand what’s at stake.

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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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