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.

Butler’s Pantry & Scullery Design: Why King County Kitchen Remodels Are Adding Hidden Prep Kitchens in 2026

Walk into any newly remodeled high-end home in Issaquah, Bellevue, or Sammamish in 2026, and one feature keeps showing up behind the main kitchen: a tucked-away secondary space where the coffee machine lives, the small appliances disappear, and the prep work happens out of sight. It’s called a butler’s pantry — or, when it’s a fully working second kitchen, a scullery — and it has become the single most-requested add-on in King County kitchen remodels this year.

At Prolific Design-Build and Restoration, we’ve watched butler’s pantry and scullery requests roughly triple over the past 18 months. Homeowners want hosting-ready main kitchens that stay magazine-clean, and they want a hardworking back-of-house space that absorbs the mess. This guide breaks down exactly what these spaces are, what they cost in King County, how to fit one into your existing footprint, and why pairing this trend with other 2026 design moves can dramatically increase the value of your home.

Butler’s Pantry vs. Scullery: What’s the Difference?

The terms get used interchangeably, but there’s a real distinction that matters when you’re planning a remodel:

A butler’s pantry is traditionally a transitional space between the kitchen and dining room. It’s designed for serving and storage — think a long countertop for plating, upper and lower cabinetry, a beverage fridge, possibly a bar sink, and dedicated storage for serving pieces, glassware, and table linens. It’s a place you walk through, not a place you cook in.

A scullery goes further. It’s a fully functional secondary kitchen — a second sink, a dishwasher (sometimes two), a prep range or induction cooktop, deep counters for messy prep, and usually a generous walk-in pantry zone. In 2026 King County homes, sculleries are where the holiday turkey actually gets cooked while the front kitchen stays presentation-ready for guests.

For most Pacific Northwest homeowners, the right answer lives somewhere in between: a hybrid space with a small sink, beverage center, second dishwasher, and serious appliance storage. We help clients figure out where on that spectrum their home and lifestyle should land during the design phase.

Why This Trend Exploded in 2026

Several forces converged to push butler’s pantries and sculleries from “nice to have” to “must have” on Eastside remodel wish lists:

Open-concept fatigue. After a decade of tearing down walls, homeowners are realizing that a wide-open kitchen visible from the living room means every dirty dish is on display. A scullery hides the chaos without forcing you to close off the kitchen entirely. (We wrote about concealed storage and streamlined cabinetry trends earlier this year — the scullery is the structural version of that same impulse.)

Hosting is back. Multigenerational gatherings, dinner parties, and holiday hosting all came roaring back, and homeowners want a kitchen that performs under pressure. A second sink and dishwasher transform a six-person dinner into a manageable evening.

Small appliance creep. Espresso machines, stand mixers, air fryers, sous vide setups, smoothie blenders, juicers, food dehydrators — the average Eastside kitchen now juggles 8 to 12 countertop appliances. A butler’s pantry gets them off the main counters without exiling them to a basement cabinet.

Resale data. King County listings featuring “butler’s pantry” or “scullery” in 2025 sold faster and closer to asking price than comparable homes without them, according to multiple Eastside agents we work with. Builders building new in Sammamish and Redmond now spec sculleries by default in the $1.5M+ tier.

What a Butler’s Pantry Costs in King County in 2026

Costs vary widely based on size, finishes, and how much plumbing and electrical work is required. Here are the ranges we’re seeing across King County this year:

Basic butler’s pantry retrofit ($18,000 – $35,000): Converting an existing closet, hallway, or unused dining nook into a butler’s pantry with upper and lower cabinetry, a stone counter, beverage fridge, and basic lighting. No new plumbing.

Mid-range butler’s pantry build ($35,000 – $65,000): A purpose-designed space with quartz or quartzite counters, a small prep sink, beverage center, microwave drawer, custom cabinetry, decorative lighting, and tile or wallpapered accent walls.

Full scullery build ($60,000 – $140,000+): A second working kitchen with dual sinks, dishwasher, induction cooktop or full range, refrigeration, custom millwork, and dedicated ventilation. The high end of this range includes warming drawers, panel-ready appliances, and built-in coffee systems.

These numbers assume you’re working within an existing footprint and don’t need to expand the home. Adding square footage pushes costs into ADU/addition territory — typically $400–$600 per square foot in King County in 2026. Most of our clients find creative ways to carve a butler’s pantry out of existing space, often by absorbing an oversized hallway, a formal dining room corner, or a rarely used powder bathroom.

Where to Put One in a Typical Eastside Home

The most common King County floor plans — 1990s and 2000s builds in Issaquah Highlands, Klahanie, Redmond Ridge, and Bellevue’s plateau neighborhoods — have a few predictable spots where a butler’s pantry fits beautifully:

Between kitchen and formal dining. The classic location. Most homes built since 1995 have a pass-through wall here that’s begging to become a hardworking transition space.

Replacing an underused formal dining room. Many families in 2026 prefer one large casual dining space over a separate formal dining room. Repurposing half of the formal dining into a scullery — and keeping the rest as a flex banquette — is one of our favorite high-ROI moves.

Converting an oversized laundry-mudroom combo. If your laundry is large and underused, splitting it into a smaller laundry plus a butler’s pantry can be transformative. This pairs perfectly with a smart mudroom and drop zone design.

Stealing from the garage. Bumping the kitchen wall a few feet into an attached garage is a common move on Eastside homes with deep three-car garages. The lost garage depth is usually negligible; the kitchen gain is huge.

Reconfiguring a walk-in closet or den. First-floor dens that nobody uses are prime scullery real estate, especially in single-story Sammamish and Redmond ramblers.

2026 Design Moves That Make a Butler’s Pantry Sing

This is where the project gets fun. The 2026 design trends we’re weaving into King County butler’s pantries this year include:

Color drenching. Because a butler’s pantry is a discrete, enclosed space, it’s the perfect place to go bold with paint. We’ve been wrapping pantries in deep forest green, oxblood, navy, and warm terracotta — colors that would feel overwhelming in a full kitchen but stop guests in their tracks when they peek in. (See our breakdown of color drenching in 2026 King County homes.)

Warm metals and natural materials. Unlacquered brass hardware, hand-glazed tile, and real wood (not laminate) shelving are the signature finishes of the 2026 pantry. Honed soapstone and warm-toned quartzites have largely replaced cool white quartz on the higher-end projects. Our guide to natural materials in home design covers the broader shift.

Curves and arches. A barrel-vault doorway or arched cased opening leading from the main kitchen into the butler’s pantry is one of the most photographed details we install. It signals craft and warmth in a way that a flat header never can.

Concealed appliance garages. Counter-height cabinets with retractable doors hide the espresso machine, toaster, and stand mixer when not in use — keeping surfaces clean while leaving everything plugged in and ready.

Integrated coffee bars. Plumbed espresso machines, undercabinet cup warmers, and dedicated drawer storage for beans, pods, and accessories. The coffee bar is the single most-used feature of any butler’s pantry we build.

Smart lighting. Layered task, ambient, and accent lighting on dimmers makes the space feel like a jewel box at night. We typically run three separate circuits in even a modest butler’s pantry.

Bundling the Pantry With Your Larger Remodel

The single biggest mistake we see is homeowners trying to add a butler’s pantry as a one-off later, after their main kitchen is already remodeled. It’s almost always cheaper, faster, and better-looking to bundle the pantry into the original kitchen project — or even into a kitchen-plus-bathroom-plus-interior bundle.

Why? Trade efficiency. Bringing electricians, plumbers, tile setters, and cabinet installers in once for a combined project versus twice for sequential projects can save 15–25% on labor. The cabinetry vendor will do better pricing on a larger order. The design and permitting work consolidates. And you only live through one period of construction dust.

We unpack the math in detail in our piece on project bundling for King County kitchen and bathroom remodels, but the short version: if a butler’s pantry or scullery is anywhere on your wish list, build it into the original scope.

Permits, Code, and the King County Reality

A butler’s pantry that only adds cabinetry and a beverage fridge typically doesn’t require a permit. The moment you add plumbing for a prep sink, electrical for a new circuit, or any wall framing, you’re in permit territory in every Eastside jurisdiction. Issaquah, Sammamish, Bellevue, and unincorporated King County all require electrical and plumbing permits for these scopes.

If you’re going full scullery with a second range or cooktop, you may also trigger ventilation requirements, which means a new exterior wall vent or a more robust shared ventilation strategy with your main kitchen. We handle all of this in-house as a licensed and insured design-build contractor — clients don’t have to chase permits or coordinate trades themselves.

Common Mistakes to Avoid

After dozens of these projects across King County, here are the pitfalls we steer clients away from:

Making it too narrow. A butler’s pantry needs at least 42 inches of clear aisle if you want two people to move through it comfortably. Shave below that and the space feels like a hallway, not a working room.

Skimping on ventilation. Even a butler’s pantry (no cooktop) benefits from an exhaust fan if you’re storing a coffee machine — espresso steam in a confined space ages cabinetry fast.

Cheap hardware. Hinges, drawer slides, and pulls take more abuse in a butler’s pantry than almost anywhere else in the house. Buy soft-close hardware and solid metal pulls; the plastic stuff will fail within three years.

Forgetting outlets. We design butler’s pantries with twice as many outlets as look necessary. You’ll fill every one of them within a year.

Ignoring sightlines. If the butler’s pantry is visible from your main entertaining space — even partially — design it as if it were on display. That means matched cabinetry style, intentional lighting, and a finished back wall.

Is a Butler’s Pantry Right for Your Home?

Honest answer: not every home needs one, and not every floor plan can accommodate one without expensive structural changes. The clients who get the most out of these spaces share a few traits — they host regularly, they cook from scratch, they keep their kitchens as a gathering hub, and they have the existing square footage to carve from.

If you’re in a 1,400-square-foot Issaquah rambler with no extra room to give up, a smarter move might be a deep walk-in pantry with appliance garages rather than a separate butler’s pantry. If you’re in a 3,800-square-foot Bellevue colonial with an unused formal dining and an oversized laundry, you have all the raw material you need for a stunning scullery.

The right design-build partner will tell you honestly which path makes sense for your specific home. That’s a conversation we have with every kitchen remodel client — sometimes we talk people out of a butler’s pantry when the better move is to invest in a more thoughtful main kitchen.

Ready to Plan Your 2026 Kitchen With a Butler’s Pantry?

Prolific Design-Build and Restoration is a licensed and insured, Black-owned and Latino-owned design-build contractor serving Issaquah, Sammamish, Bellevue, Redmond, Kirkland, Renton, and the rest of King County. We handle design, permits, construction, and final finish in-house, so you have one accountable team from first sketch to last walkthrough.

If a butler’s pantry or scullery is on your 2026 wish list — whether as part of a full kitchen remodel or as a focused upgrade — we’d love to walk your home and talk through what’s possible. Call us at (425) 800-4775 or visit our contact page to schedule a no-pressure consultation. We’ll give you a clear scope, honest pricing, and a timeline you can plan around.

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Prolific Design-Build & Restoration — Federal Way, WA

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