Bothell's mix of established neighborhoods, newer subdivisions, and semi-rural parcels creates genuinely different addition opportunities depending on where you are in the city. A Norway Hill property on a large wooded lot has room for a detached ADU and a rear addition simultaneously. A North Creek townhome has almost no lot to work with and the answer might be a second story. A Canyon Park home from the 1990s on a flat suburban lot is the most straightforward addition scenario in the city. Armada Design & Build has been building home additions in Bothell since 2011 — across all of these lot types, housing eras, and neighborhood contexts.

Why Bothell Homeowners Add Instead of Move

The Case for Expanding in Bothell

Bothell has changed significantly over the past decade. The downtown revitalization, UW Bothell's growth, and continued development along Canyon Park and Beardslee Boulevard have made Bothell meaningfully more desirable — and the housing prices reflect that. Moving to a larger home in Bothell now means competing in a market that's substantially more expensive than when many current homeowners bought, and leaving behind school district placements, neighborhood connections, and commute patterns that work.

Northshore School District families in particular tend to be deeply reluctant to move. The decision to add rather than move here is often less about economics and more about continuity — the neighborhood, the school, the relationships. A well-planned addition delivers the space without the disruption of relocation.

Addition Types

What We Build in Bothell

Second-Story Additions

For Bothell's townhomes and compact suburban lots where rear yard setbacks limit ground-floor expansion. Adding a second story gains significant square footage without consuming yard space. Common in North Creek and Downtown Bothell.

Rear Attached Additions

Expanding into the rear yard for kitchens, family rooms, or primary suites. Canyon Park and Maywood/Beckstrom Hill homes on standard suburban lots are well-suited for rear additions of 200–600 sq ft.

Detached ADUs

Norway Hill and Shelton View properties on larger wooded lots are well-positioned for detached accessory dwelling units. Washington's updated ADU legislation has significantly expanded what's allowed — we review current rules for your specific parcel.

In-Law Suites

Attached in-law suites with private entries for multigenerational living. Bothell's family-oriented demographic makes this one of the most common addition types we build here.

Garage Additions

Attached and detached garage additions, including oversized garages with workshop or storage loft space. Bothell's semi-rural parcels on the Norway Hill and Shelton View side often have room for detached structures.

Sunrooms & Covered Porches

Conditioned sunrooms and covered outdoor living additions that extend livable space toward Bothell's wooded surroundings. Popular in the Norway Hill and Maywood Hill neighborhoods with mature tree canopies.

Local Regulations

What Bothell Permits and Zoning Actually Require

Key Regulatory Considerations for Bothell Additions

Permitting Authority

City of Bothell Building Division. We prepare and submit the full permit package. Plan review typically runs 4–8 weeks for addition scope depending on structural complexity.

Setbacks

Vary by zone. Most Bothell residential zones require 5-foot side setbacks and 20-foot rear setbacks. We verify the specific requirements for your parcel before any design begins.

Tree Preservation

Norway Hill and Shelton View's wooded lots often trigger tree retention requirements. We assess significant trees at the first site visit to understand what constraints they create for the addition footprint.

ADU Rules

Washington's ADU legislation updates have changed what Bothell allows. We review current state and local rules for your parcel — lot size, existing building square footage, and zone all affect feasibility.

Critical Areas

North Creek and its tributaries create critical area buffers on some Bothell parcels. We screen for this at the site assessment stage before design investment begins.

Height Limits

35 feet in most Bothell residential zones. We verify for each project given existing structure height and lot slopes.

Bothell's Semi-Rural Lots Create Unique Addition Opportunities

The Norway Hill and Shelton View neighborhoods have larger parcels than most of the Eastside — sometimes half an acre or more — which opens up addition types that simply aren't feasible on Bellevue or Redmond's more constrained lots. A detached ADU with a private yard. A workshop or studio structure separate from the main house. A garage addition with living space above. We approach every Bothell project with an eye for what the lot actually allows, not what a standard suburban lot permits.

That said, Canyon Park and North Creek's more typical suburban lots require the same discipline as anywhere else — careful setback analysis, tree assessment, and lot coverage calculation before committing to a design direction. We do this work before any design investment begins, so you know what's actually feasible before we draw anything.

Our Process