Get your ADU or DADU permit in Seattle — without stress.
We’ll handle the paperwork, the city requirements, and even help you choose the right plan.
Let's go!
How it works
No Clue Where to Start?
Too Many Rules?
Difficult Lot?
Hate Paperwork?
We guide you step-by-step —
no experience needed.
We know Seattle’s code and
do it right the first time.
Trees, slopes, setbacks? We
adapt your plan and handle it.
We fill out, submit, and
follow up with the city for you.
Skip the Paperwork. Build Sooner.
Get your ADU or DADU permit in Seattle — without stress.
We’ll handle the paperwork, the city requirements,
and even help you choose the right plan.
GET A FREE CONSULTATION
СALL NOW 206.840.8356
Permits Are Confusing. We Make Them Easy.
Navigating Seattle’s ADU permit process alone can be overwhelming. We simplify every step — from site plans to city approvals.
  • Custom Site Plans
    Every lot is different. We create yours from scratch.
  • Full Permit Submissions
    We fill out, submit, and track everything for you.
  • Pre-approved or Custom Designs
    We’ll help you pick the right path — or adapt your plan.
  • Direct Contact with the City
    You won’t have to call the city. We’ll do it for you.
How It Works
Free Property Review
We check your lot, zoning, and what's allowed — for free.
Custom Site Plan
Even with a pre-approved design, the city requires a site-specific plan.
We handle that.
Permit Submission & Follow-up
We submit, track, and answer city questions for you — so you can focus on what matters.
Common Questions, Answered.
Do I still need a site plan with a pre-approved ADU design?
Yes. Every property in Seattle needs a custom site plan to get a permit.
Can I make changes to a standard plan?
Small changes like windows, roof lines, or wall height might be allowed — we’ll guide you.
How long does it take?
If everything goes smoothly — as little as 2–6 weeks. We help speed it up.
What if my lot has trees, slopes or restrictions?
We evaluate this early and work with any needed consultants to avoid delays.
Why Seattle Homeowners Trust Modern Buildings
  • Proven Experience
    10+ years of experience with Seattle permits
  • Expert Team on Your Side
    Local civil & structural engineers ensure your project is buildable and approved
  • We Handle the City
    No more confusing forms or endless calls — we speak the city's language
  • No Guesswork on Price
    Clear, upfront pricing with no hidden fees or surprise charges
  • Flexible Design Options
    Whether you use a pre-approved plan or need something custom — we’ve got you covered
Ready to Build? Start with a Free Lot Assessment.
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