Typical Lot Size
8,000 – 15,000+
sq ft
Max ADUs
2
per lot
Permit Type
Standard Building Permit (Seattle DCI)
Timeline
6 – 10 weeks
Median Home Price
$1.0M – $1.5M
Est. ADU Rent
$2,200 – $3,000/mo
Neighborhood Overview
Magnolia boasts the largest residential lots in Seattle (8,000–15,000+ sq ft), perfect for spacious detached ADUs. Limited transit means parking is generally NOT exempt, but the expansive yards and upscale setting create exceptional DADU potential.
Magnolia is a peninsula neighborhood of quiet, winding streets, expansive lots, and water and mountain views, bordered by the 534-acre Discovery Park. Its relative isolation gives it a serene, suburban-within-the-city feel that residents prize. The housing stock features mid-century and custom homes on some of the largest lots in Seattle — commonly 8,000–15,000+ sq ft — with mature landscaping and generous setbacks. The trade-off for this spaciousness is limited transit: Magnolia has no RapidRide service, so most parcels do not qualify for the ADU parking exemption. Still, the enormous lots make Magnolia arguably Seattle's best neighborhood for large, freestanding detached ADUs, and the upscale, family-oriented setting supports solid rents.
Magnolia has the largest residential lots in Seattle, commonly 8,000–15,000+ sq ft with some over a third of an acre. These expansive parcels easily support full 1,000 sq ft detached ADUs with room for parking, landscaping, and privacy.
ADU Construction Allowed
Magnolia qualifies for ADU construction under Seattle's ADU ordinance (SMC 23.44.041) and Washington's HB 1337.
- Detached ADUs (DADUs) allowed
- Attached ADUs allowed (basement, addition, above-garage)
- Up to 2 ADUs per lot
Transit routes: Metro Route 24, Metro Route 31, Metro Route 33
Why Build an ADU in Magnolia
- Largest residential lots in Seattle (8,000–15,000+ sq ft) — ideal for large detached ADUs
- Expansive yards easily accommodate a full 1,000 sq ft DADU with parking and privacy
- Upscale, family-oriented setting bordered by Discovery Park
- Room for off-street parking, which is helpful since most lots are not transit-exempt
- Up to 2 ADUs per lot under CB 119544; HB 1337 protects DADUs to 1,000 sq ft
Special Considerations
Parking generally required
Magnolia lacks RapidRide service, so most parcels are NOT within the transit parking exemption — plan for an off-street parking space (the large lots make this easy).
Bluff and shoreline review
Western and southern bluff lots may need geotechnical review, and parcels within 200 ft of Puget Sound trigger SMA review (4–8 weeks).
Extended utility runs
On very deep lots, sewer and water connections to a rear DADU can add $5,000–$15,000 depending on distance from the main.
Exceptional trees
Large landscaped lots frequently have trees over 24" DBH requiring a separate removal permit.
Learn more about ADU regulations: Review Seattle ADU laws, understand the permitting process, or see the complete cost breakdown for King County.
Explore ADU options: Compare detached ADUs, attached ADUs, garage conversions, and basement conversions. Not sure which? Read our DADU vs ADU comparison.
Planning resources: Financing options, rental income estimates, ROI analysis, and the complete building checklist.
Ready to get started? Our free feasibility study analyzes your specific parcel in 48 hours.
Frequently Asked Questions
Why is Magnolia good for large detached ADUs?
Magnolia has the largest residential lots in Seattle — commonly 8,000–15,000+ sq ft. These expansive parcels easily accommodate a full 1,000 sq ft detached ADU (the maximum HB 1337 protects from local size limits) with room left for off-street parking, landscaping, and privacy. Seattle Municipal Code 23.44.041 governs DADUs, and the 2019 reform allows up to two ADUs per lot.
Do I need to provide parking for a Magnolia ADU?
In most cases, yes. Magnolia has no RapidRide service, so the majority of lots fall outside the half-mile frequent-transit zone and are not exempt from ADU parking requirements. The good news is that Magnolia's large lots make adding an off-street parking space straightforward. We confirm transit-exemption status for your specific address.
How much does a Magnolia DADU cost and rent for?
Detached ADUs in Magnolia run $450,000–$800,000+ depending on size and finishes, plus $20,000–$50,000 in Seattle DCI permit and impact fees. The neighborhood's large lots allow bigger units, and Magnolia ADUs typically rent for $2,200–$3,000/mo given the upscale, family-oriented setting.
Are there shoreline or slope concerns in Magnolia?
For some lots. Bluff-edge parcels on Magnolia's western and southern flanks may have steep-slope or landslide overlays requiring geotechnical review, and lots within 200 feet of the Puget Sound shoreline trigger Shoreline Management Act (SMA) review, adding 4–8 weeks. Most interior Magnolia lots are flat and unaffected.
