Short answer
Shoreline and Edmonds are separate cities from Seattle, each with its own permit department. The housing stock is largely 1950s–1970s ramblers, split-levels and daylight basements on generous lots — sound structure, dated layouts, and enough land that additions and ADUs are often feasible where they wouldn't be in the city.
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Two jurisdictions, neither of them Seattle
**Shoreline** incorporated in 1995 and runs its own permit services. **Edmonds** is in Snohomish County and runs its own as well. Neither uses Seattle's SDCI, and neither uses King County's process for Shoreline's part of the county.
That matters more than it sounds. Fee schedules, review timelines, critical-areas rules, tree retention requirements and inspection scheduling all differ. A contractor who has pulled permits in your specific city will move faster than one learning the process on your job.
The housing stock
Both cities built out largely in the postwar decades. What you'll typically find:
**1950s–1970s ramblers and split-levels.** Single-story or split, on lots that are generous by Seattle standards — 7,000 to 12,000 square feet is common. Attached or detached garages, real yards.
**Daylight basements** on the sloped lots, especially where the land falls toward Puget Sound.
**Some 1920s–1940s stock** in the older cores — particularly in downtown Edmonds and along the older Shoreline arterials.
**Newer infill,** increasing near the light rail stations.
The structural profile is favorable: modern-era wiring (often on an undersized panel), copper or early plastic supply, square framing, and no knob-and-tube in most of it. What these houses lack is insulation depth, decent windows, and layouts that suit contemporary use.
What light rail changed
Sound Transit's Lynnwood Link extension opened in August 2024, adding stations at Shoreline South/148th, Shoreline North/185th, Mountlake Terrace and Lynnwood City Center.
Two effects on remodeling:
**Upzoning around the stations.** Shoreline adopted station-area planning ahead of the openings, and the areas near 145th and 185th allow considerably more density than the surrounding single-family blocks. If your property is in one of those areas, the development options may be broader than you'd assume — worth checking the zoning before assuming a remodel is the only path.
**Renewed investment.** More people are choosing to stay and remodel rather than move, which is the reason a lot of these mid-century houses are getting rebuilt rather than replaced.
The mid-century rambler remodel
This is the defining project in both cities, and it has a consistent shape.
**What's usually wrong:**
- Kitchen closed off from everything, often with a pass-through as the only concession
- A formal living room nobody uses and a family room that's too small
- Three bedrooms sharing one hall bathroom, with no primary suite
- Single-pane or early double-pane windows
- Insulation that meets 1962 standards
- An 100- or 125-amp panel
- A furnace at the end of its life, with no cooling
**What the remodel typically does:**
- Removes the kitchen walls — usually bearing, but in a single-story rambler the structural fix is a beam and posts with a checked load path, not a complex multi-story header
- Converts a bedroom or bumps out for a primary suite with an ensuite bath
- Insulates and re-windows
- Upgrades the panel and, increasingly, converts to a heat pump
- Replaces the finish throughout — flooring, trim, doors, lighting
**What it costs:** $200–$400 per square foot for a full remodel, so roughly $300,000–$600,000 on a 1,500-square-foot rambler. Less if the scope stops at kitchen and baths.
Additions and ADUs
Generous lots are the advantage here.
**Additions** — a primary suite bump-out, a family room, a second story — are often feasible on setbacks and lot coverage in a way they aren't on a 4,000-square-foot Seattle lot. Check each city's setback, coverage, impervious surface and tree retention rules; these vary between Shoreline and Edmonds and are more restrictive than people expect.
**ADUs and DADUs.** Washington state law has pushed cities to expand accessory dwelling unit allowances, and both Shoreline and Edmonds have updated their codes in recent years. With lots this size, a detached unit is often physically straightforward. Confirm the current rules with the city at the time you plan — this area of code has been changing.
**Critical areas.** Both cities have mapped steep slopes near the water and stream corridors inland. Edmonds in particular has bluff areas above Puget Sound where geotechnical review applies. Check the parcel before designing anything exterior.
Costs and what's different
