Floor Plan Drafting · Seattle, WA
Professional Floor Plan Drafting
for Seattle, WA Homes
As-built drawings, permit-ready floor plans, and renovation layouts for Seattle homeowners, investors, and contractors. Accurate CAD drawings in 10 business days, starting at $997.
14-day money-back guarantee · 10 business day turnaround
Common Uses in Seattle
Local Intelligence
What Seattle Homeowners Need to Know Before Submitting
Size & Zoning Rules
Accurate floor plans are the foundation of any ADU, garage conversion, or addition permit in Seattle — Seattle Department of Construction & Inspections will not accept a permit application without them. Seattle's current ADU size cap is 1,000 sq ft — within the typical range for most floor plan configurations.
Seattle does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
Homeowners in Seattle who document and legitimize their square footage correctly are positioning a home in a rental market where 1-bedroom units average approximately $2,015/month.
Permit Process & Fees
Seattle Department of Construction & Inspections permit fees for this project type typically range from $11,638 to $13,022 depending on project valuation and scope. Plan check runs approximately 17 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Floor plans submitted to Seattle Department of Construction & Inspections as part of a permit application must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus if structural changes are involved, a licensed engineer must stamp the structural drawings.
Visit Seattle Department of Construction & Inspections ↗Construction Cost Context
Seattle's adu / renovation construction costs run $385–$630 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in Seattle
Many Seattle lots—especially in older neighborhoods like Ballard or Wallingford—still have side sewer lines from the 1920s that can't handle a second unit, so SDCI will require a side sewer inspection and often a full replacement before they'll sign off, adding real cost and weeks nobody budgets for. If your lot falls within the shoreline management area near the Ship Canal, Lake Washington, or Puget Sound, you'll also need a Coastal Development Permit, which typically tacks on 6-10 weeks of extra review since it's processed separately from your standard building permit. On top of that, SDCI's DADU rules require you to prove existing off-street parking or add it, and corner lots often trigger extra setback headaches that generic ADU guides never mention.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience, that $550/sqft and 17-week timeline are Seattle-wide estimates, not gospel — I'd get at least two local contractor quotes and call SDCI directly before penciling in numbers this specific. And since you're in a coastal overlay, don't sleep on the CDP process; I've seen it tack on months beyond the standard plan check, especially if shoreline setbacks or environmental review get triggered."
Market Context
Seattle has a median home value of $800,000. Comparable renovation projects in this market typically add 28.0% to resale value.
Neighborhoods in Seattle with the strongest renovation and resale value potential include University District, Ballard, Magnolia, Wallingford, Phinney Ridge. High rental demand from UW students/staff and many single‑family lots suitable for DADUs.
Permit Process
Permit applications are reviewed by the Seattle Department of Construction & Inspections, with a plan check timeline of approximately 17 weeks. Permit fees in Seattle range from $11,638 to $13,022 depending on project scope. Design review: Yes - in historic districts/landmarks (and shorelines/other overlays may require additional permits).
Seattle falls within Seismic Design Category Seismic Design Category D (SDC D) for typical Seattle sites; some locations on very soft soils or with high S1 may be SDC E., which affects structural requirements for any new addition tying into the existing structure.
Properties within Seattle's Coastal Overlay Zone require a Coastal Development Permit in addition to standard building permits.
Local Financing Resources
Local Floor Plan Lenders in Seattle
These lenders offer HELOC and renovation financing that often requires accurate as-built drawings in King County. Compare terms before committing.
HELOCs up to $500,000; variable rates (site lists intro and ongoing APR ranges); commonly used for home improvements and renovations.
Visit Lender ↗Home Equity Lines and Loans (borrow up to ~90% LTV); rates shown on site (examples ~6.75%–9.75% APR); marketed for home renovations and improvements.
Visit Lender ↗Home equity loans and HELOCs up to 90% LTV, max loan amounts to $500,000; rates and terms shown on site (e.g., APR ranges listed).
Visit Lender ↗Offers construction and renovation financing and explicitly lists accessory dwelling units (ADUs) among eligible projects; in-house draw specialists and construction team.
Visit Lender ↗Renovation HELOC/Home equity loans based on after-renovation value (ARV), up to $750,000; RenoFi partners with credit unions to deliver loans (RenoFi is not itself a lender).
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted Local Contractors in Seattle
Need a contractor once your drawings are ready? These are vetted local options. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
What We Deliver
What's Included in Your Seattle Floor Plan Package
Transparent Pricing
Seattle Floor Plan Packages
One-time fee. No retainer. No hourly billing.
- ✓As-built floor plans (all levels)
- ✓Verified square footage
- ✓Door & window schedule
- ✓Room labels and dimensions
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Electrical layout documentation
- ✓Plumbing fixture locations
- ✓Site plan with setbacks
- ✓Code notations for permit submittal
- ✓1 round of revisions
- ✓Everything in Standard
- ✓Proposed renovation overlay
- ✓3D massing model
- ✓HOA submission package
- ✓Title 24 energy compliance
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
How It Works
Your Floor Plans in 3 Steps
Share Your Home Details
Provide your property address, room measurements, and photos. We'll confirm your order and assign a drafting coordinator within 4 business hours.
We Draft Your Plans
Our CAD team converts your measurements into precise, scaled floor plans — formatted for Seattle's building department and WA code standards. Delivered in 10 business days.
Download and Use
Receive your drawings in PDF and DWG format — ready for permit submittal, contractor bidding, listing agents, appraisers, or HOA submission.
Common Questions
Seattle Floor Plan Drafting FAQs
When do I need professionally drafted floor plans in Seattle? +
You need accurate floor plans for: permit applications (required by Seattle's building department for any structural work), refinancing or home equity loans, selling your home (accurate square footage documentation), renovation contractor bidding, HOA design review submissions, and insurance claims. Our as-built drawings capture your home's exact current dimensions.
What is an as-built floor plan and why do I need one in Seattle? +
An as-built floor plan documents your home as it currently exists — including all room dimensions, door and window locations, wall thicknesses, and square footage. These are required when the original permit drawings are unavailable or the home was modified without permits. Seattle's building department requires accurate as-builts when you apply for renovation or addition permits on older homes.
How much does floor plan drafting cost in Seattle? +
Our floor plan drafting packages for Seattle start at $997 for a standard residential home. This includes measured floor plans for all levels, room labels, door and window schedules, and verified square footage. Local drafting services typically charge $1,500–$4,000 for the same work. We deliver within 10 business days with a 14-day money-back guarantee.
How do you create floor plans remotely for my Seattle home? +
You provide basic measurements (room dimensions, door/window sizes) and photos of each room. Our drafting team converts these into accurate CAD drawings with precise dimensions, wall thicknesses, and notations. For permit-grade as-built drawings, we may request additional measurements or a site visit from a local partner. We serve all Seattle neighborhoods remotely.
What format are the floor plan drawings delivered in? +
We deliver drawings in PDF (for printing and permit submission) and DWG/DXF (AutoCAD-compatible format for contractors, engineers, and architects to work from). All drawings are formatted to Seattle building department standards and include title block, scale, and code notations required for permit submission.
Can you draft floor plans for a rental property or multi-unit building in Seattle? +
Yes — we draft floor plans for single-family homes, duplexes, triplexes, ADUs, condos, and small commercial properties in Seattle. Multi-unit buildings are priced based on the total number of units and floors. Contact us for a custom quote if your property has more than 4 units.
Will accurate floor plans increase my home's value in Seattle? +
In Seattle, where median home values are around $800,000, inaccurate or missing square footage records can suppress list price and appraisal value. Professional as-built drawings establish defensible square footage for appraisers and buyers. Unpermitted additions documented and legitimized through permit drawings can recover thousands in appraised value.
Do I need floor plans to get an ADU or addition permit in Seattle? +
Yes — Seattle's building department requires accurate floor plans as part of any ADU, garage conversion, or addition permit application. Our packages combine floor plan drafting with the full permit-ready drawing set (site plan, elevations, electrical, Title 24) needed for plan check submittal. If you only need the floor plans themselves, our Starter package covers that.
Can you draft floor plans from old blueprints or photos in Seattle? +
Yes — we can redraft from original blueprints, scans of old permit sets, hand-drawn sketches, or room photos combined with your measurements. We regularize old drawings to current CAD standards and update them to reflect any modifications made since original construction. This is a common service for Seattle homes built before the 1990s.
Nearby Cities
Also Available in Seattle
Planning to build an ADU? See our ADU design service.
Next Steps
Ready to Move Forward With Your Seattle ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Seattle Department of Construction & Inspections.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
$997 – $2,997
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Seattle Department of Construction & Inspections. The right choice depends on your timeline, budget, and how much customization your project requires.