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.

Wood vs. Vinyl vs. Aluminum vs. Composite Fence — Cost Guide

URL slug: /cost-guides/fence-cost-seattle/ Target keywords: fence cost Seattle | wood fence vs vinyl fence cost | fence installation King County | how much does a fence cost in Seattle


Fence costs vary more than almost any other home improvement project — the material you choose, the linear footage, and your site conditions all play a major role. Here’s a straightforward breakdown of the four main fence material options for Seattle-area homeowners.

Fence Cost by Material — King County

All prices are installed cost per linear foot by a licensed contractor, including posts, concrete, hardware, and gates (one gate per 100 LF).

MaterialCost per Linear Foot (Installed)Typical 150 LF Project
Cedar (6 ft privacy)$38–$58/LF$5,700–$8,700
Pressure-Treated Pine$32–$50/LF$4,800–$7,500
Vinyl / PVC (6 ft privacy)$45–$70/LF$6,750–$10,500
Aluminum (ornamental, 4 ft)$40–$65/LF$6,000–$9,750
Composite (Trex Seclusions)$55–$85/LF$8,250–$12,750

Prices for King County / Seattle metro. Fence dimensions are measured as the sum of all linear runs — not perimeter.

Cedar Fence

Cedar is the most common fence material in western Washington for good reason: it’s locally available, handles moisture well, and looks natural. Western red cedar is naturally rot-resistant without chemical treatment.

Pros: Natural appearance, locally sourced, good moisture resistance, easy to paint or stain Cons: Requires maintenance (staining or sealing every 3–5 years), can warp or check over time Lifespan: 15–20 years with maintenance, 10–12 years without

Vinyl / PVC Fence

Vinyl fencing requires no painting or staining — a hose rinse is all it needs. It’s popular for homeowners who want a maintenance-free solution.

Pros: Zero maintenance, won’t rot or splinter, consistent color Cons: More expensive upfront than cedar, can yellow or become brittle in UV, not as structurally rigid for longer spans Lifespan: 20–30 years

Aluminum Fence

Aluminum is the go-to for ornamental fencing — the picket and wrought-iron look without the rust. It’s not a privacy fence, but it’s ideal for pool enclosures, front yard delineation, and aesthetic property lines.

Pros: Rust-proof, lightweight, low maintenance, clean modern look Cons: Not a privacy option, can dent, higher cost than cedar Lifespan: 30–40 years

Composite Fence (Trex Seclusions)

Trex Seclusions composite fencing uses the same material as composite decking — recycled wood and plastic. It has the natural look of wood with minimal maintenance.

Pros: Looks like wood, won’t rot or splinter, consistent color, 25-year warranty Cons: Highest upfront cost, heavier posts required Lifespan: 25+ years

What Affects Fence Cost Most?

Beyond material choice, these factors move the number significantly:

  • Site conditions: Rocky or root-filled soil requires hand-digging or rock bits — adds $8–$15/LF
  • Slope: A sloped yard requires stepped or racked fence panels — adds $5–$12/LF
  • Demo and haul-away: Removing an existing fence adds $4–$8/LF
  • Gates: Single walk gates run $350–$650 each; double drive gates $800–$1,500

Get a fence estimate from Prolific →


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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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