DADUs & backyard cottages
Detached units built for income, family or flexibility.
King County, Washington · 35+ years of construction experience within our network
Tell us what you want done.
We'll help with what comes next.
A simple starting point for residential construction projects in King County.
No cost to homeowners · A few minutes · No obligation
One project. One starting point.
We're not a contractor directory. Tell us about your project, we'll review it, and qualified projects are connected with the appropriate construction professional.
No cost to homeowners.
There's no fee to submit your project or use MC Select Co.'s connection service.
Any construction, design or professional services are contracted separately with the applicable provider. MC Select Co. is compensated by the construction professional after a project is signed.
How it works
Just tell us what you're trying to accomplish.
- 01
Tell us about your project
Choose the type of project, provide your ZIP code, budget range and timeline, and briefly tell us what you want done.
- 02
We review the details
MC Select Co. organizes your project information and reviews what you're trying to accomplish.
- 03
We determine whether it's a fit
We look at what the work realistically involves and what kind of support it needs — sometimes design comes before pricing.
- 04
We make the introduction
If it's a fit, we'll introduce you to the appropriate professional and stay in the loop from there.
Projects we can help you start
See all project typesHome & second-story additions
More square footage on the house you already own.
Whole-home & major remodels
Coordinated, phased work across the entire house.
Kitchen & bathroom remodels
High-impact spaces where thoughtful planning matters.
Basement & garage conversions
Turning existing space into real living space.
New residential construction
Custom homes on infill and existing lots.
Not sure whether your project is the right size or scope? Tell us about it — we'll confirm fit during review and tell you plainly either way.
Experience within our construction network
Selected projects completed by professionals within our construction network — homes, additions and DADUs across King County.
Modern infill residence
New construction · Ground-up single family
Whole-home rebuild with attached garage
New construction · Garage and full interior build-out
Detached cottages (DADU pair)
DADU · Two detached units on one lot
Three-unit townhome row
New construction · Currently in design and permitting
Multi-structure lot redevelopment
New construction + DADU · Currently under way
Why homeowners start here
You don't need to know who to call
You don't have to understand every construction trade or know exactly what your project requires. Tell us what you're trying to accomplish.
35+ years of experience behind you
Qualified projects are connected with professionals who have decades of King County construction experience.
A person reviews every project
Your project is reviewed by our team before any connection is made — technology helps organize it, people decide the next step.
King County only
Focused exclusively on King County. Local zoning, local permitting, local professionals.
Simple for you. Organized behind the scenes.
You describe the project in plain language. Our technology organizes the details — type of work, location, budget range and timeline — so our team can review it quickly.
A person reviews every project before any introduction is made.
Tell Us About Your ProjectWho does the work
When your project is a fit, we introduce you to the appropriate construction professional — designers, permit support, general contractors or specialty trades, depending on what the project actually needs.
MC Select Co. provides project intake, qualification, and connection services. Construction services are performed under separate agreements with the applicable construction professional. Project acceptance, pricing, scope, scheduling, and availability are subject to review by the construction provider.
Service area
King County, Washington
We're building depth in one county rather than breadth across the country. If your property is outside King County, you can join the expansion waitlist.
SeattleBellevueKirklandRedmondMercer IslandIssaquahRentonShorelineBothellSammamishNewcastleBurienSeaTacTukwilaKentFederal WayWoodinvilleAuburnDes MoinesKenmoreand other King County communities
An example project journey
You tell us
"I want to add a 700 sq. ft. DADU behind my Seattle house. I have around $250,000 and would like to start next spring."
We review it
We organize the details, look at what the project realistically involves, and determine whether it's a fit for our network.
We point you to the right next step
Because there are no drawings yet, design work comes first — and we introduce you to the right professional to start it.
What you can expect
- MC Select Co. is a front door, not a marketplace — we don't shop your project across competing contractors.
- Every project is reviewed by our team; technology only helps organize the information.
- Next steps are preliminary guidance and can change after professional review.
- We never promise pricing, permit approval or a construction schedule.
Common questions
Tell us what you want done. We'll help with what comes next.
Simply tell MC Select Co. what you are trying to accomplish. We'll help determine the next step.
Tell Us About Your Project