854 sq ft ADU Addition
in Seattle View Ridge
An 854 sq ft two-bedroom addition to an existing 1,640 sq ft home in Seattle's View Ridge neighborhood. The addition includes a full kitchen/dining area with skylight, two bedrooms, two bathrooms, and connects to the existing 300 sq ft attached garage. Stone veneer exterior with 29-gauge SM-Rib steel roof panels. New foundation structurally tied to existing with epoxy-set rebar dowels. Six professional 3D renders showcase the completed design. Built by Evercrest LLC, a licensed general contractor building home additions, attached ADUs (AADUs), and backyard cottages (DADUs) across the Greater Seattle area.
3D Render — Street View
Street-facing perspective showing the 854 sq ft addition seamlessly integrated with the existing home. The new structure extends along the side, featuring stone veneer accent siding and a modern flat-to-shed roofline with 29-gauge SM-Rib steel panels.
The addition sits on a new foundation structurally tied to the existing home using Simpson SET3G epoxy rebar dowels — a critical detail for Seismic Category D construction.
3D Render — Entry View
Entry perspective showing the addition's connection to the existing home. The design creates a cohesive look — stone veneer on the new portion complements the original siding, while the steel roof adds a contemporary accent.
Concrete steps lead to the new entry. The addition is designed to work with the existing home's grade changes — garage level at 1'-2", main floor at 2'-2".
Floor Plan
Kitchen/Dining (298 sq ft) — the largest room. Open plan with skylight for natural overhead light. Ceiling heights from 8'-2" to 10'-1".
Bedroom 1 (154 sq ft) — primary bedroom adjacent to full bath.
Bedroom 2 (106 sq ft) — guest room or home office.
Bath 1 (77 sq ft) — full bath, accessibility-friendly layout.
Bath 2 (45 sq ft) — compact second bathroom.
Garage (300 sq ft) — existing, retained. Fire-rated steel door to living space.
Elevations — West & South
West and South elevations show the addition's profile relative to the existing home. Top of new roof at 16'-2", existing roof at 20'-2". Clearly marked "NO WORK" zones on the existing structure.
The addition features V12 H7 and V12 H2 windows for balanced light. Stone veneer accent below the window line, Hardie plank above. Continuous gutters and downspouts on all new eaves.
Elevations — East & North
East and North elevations show the addition's integration from the back of the property. The east-facing side features multiple windows and a garage door at the lower level.
The north elevation shows the transition between existing and new construction, with careful attention to roof height matching and flashing details at the connection points.
Building Specifications
Permit
Status: Under Review
Authority: City of Seattle SDCI
Codes: 2021 IRC, WSEC 2021, SMC
Project Team
General Contractor: Evercrest LLC
Architect: Global Precision Designs Inc.
Engineer: Guibin Lu, PE #42309 (WA)
Understanding ADU Additions in Seattle
An ADU Addition expands an existing home by adding new living space — bedrooms, bathrooms, kitchens — structurally connected to the original structure. Unlike a DADU (detached unit), an addition shares walls and foundation connections with the main home. Seattle's NR3 zoning allows up to 50% lot coverage, making additions viable on smaller lots where a detached unit wouldn't fit. Evercrest LLC handles structural engineering, permitting, and construction of home additions, attached ADUs (AADUs), and backyard cottages throughout Seattle and the Eastside.
ADU Additions in Seattle View Ridge — FAQ
ADU additions in Seattle typically cost $250–$400+ per square foot depending on complexity, finishes, and foundation work. Additions that tie into existing structures require specialized engineering — epoxy rebar dowels, matched foundation systems, and seismic upgrades — which adds cost compared to new standalone construction. Evercrest LLC provides fixed-price contracts.
Seattle SDCI typically processes home addition permits in 4–8 months. Additions are often more complex to review than standalone DADUs because they involve structural connections to existing buildings. Evercrest LLC manages all submissions and revisions.
Yes. Seattle is in Seismic Category D, which requires engineered connections between new and existing structures. This project uses 17 holdown points and Simpson SET3G epoxy rebar dowels to structurally tie the new foundation to the existing one.
Yes. Seattle allows full kitchens in ADU additions. This View Ridge project includes a 298 sq ft kitchen/dining area with skylight, range hood, and whole-house ventilation. Fire-rated doors are required between the addition and attached garage.
View Ridge is a residential NE Seattle neighborhood zoned NR3, which allows up to 50% lot coverage — among the most generous in the city. The neighborhood features mid-century homes on larger lots (this one is 10,375 sq ft), making it ideal for additions. Close to Sand Point, Magnuson Park, and University Village.
Yes. Adhered masonry veneer must meet IRC R703.12.1 clearances — 4" minimum above grade and 1/2" above exterior walking surfaces. This project combines stone veneer accent areas with Hardie plank siding and SM-Rib steel roof panels.
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