Adding a Bedroom Downstairs in Edmonds: Egress, Ceiling Height, and the "Non-Conforming" Bedroom

PacificProGroup

This week I sat down with the listing for a 1962 split-level in the Edmonds Bowl. Daylight lower level, rec room with a wood-burning fireplace, a three-quarter bath, a slider to the patio, and a fourth bedroom. The listing called that fourth bedroom "non-conforming." The buyer wanted to know if we could add one or two bedrooms downstairs, and whether to convert the space they had or build onto it.

Before anyone talks about cabinets or flooring, "non-conforming" is the word that matters. In plain terms it means the room is being used as a bedroom but probably doesn't meet the code for one. On this house I searched the City's permit records by address and parcel. I found three permits: the original house in 1962, a water heater, and a furnace. Nothing for finishing the lower level or creating that bedroom. So you have to assume it's either original but out of code (egress, ceiling height) or it was finished without a permit.

Here's how I walk a homeowner through a lower-level bedroom.

What makes a room a legal bedroom

Washington uses the International Residential Code (IRC) through WAC 51-51. Confirm the edition with the City, but these are the sections I check every time:

• Emergency escape and rescue opening (IRC R310). Every sleeping room needs a door to the outside or an operable window with at least 5.7 sq ft of net clear opening (5.0 sq ft at a grade floor). The opening has to be at least 24 inches clear high and 20 inches clear wide, with the sill no more than 44 inches above the floor. If you need a window well, it has to be at least 9 sq ft with a 36-inch projection, and it needs a ladder if it's deeper than 44 inches.
• Ceiling height (IRC R305). Habitable basement rooms need at least 7 feet. Beams and ducts can drop to 6 ft 4 in.
• Room size (IRC R304). At least 70 sq ft, and no less than 7 feet in any horizontal direction.
• Smoke and CO alarms (R314/R315). Adding a bedroom triggers them, and interconnection may be required.
• Moisture, insulation, and garage separation. Footing drainage, the Washington Energy Code, and fire separation if the room backs up to the garage.

On a daylight split-level, egress is often the easy part. The low side of the house is already at grade, and a new window on that wall usually means no deep window well at all. Ceiling height is where 1960s lower levels get tight, especially under ducts and beams. That's the first thing I measure on the site visit.

Convert or add on?

On this lot the answer leaned hard toward converting space inside the house. The zoning is LDR-S, which caps lot coverage at 35% (more on that in our lot coverage article). By my rough math only about 300 to 370 sq ft of coverage was left before counting decks or patios. A conversion adds no footprint, so coverage doesn't come into it. A second bedroom could come from re-planning the rec room, likely with a new egress window on the daylight side.

An addition was possible only if it stayed small, around one bedroom plus a closet. It might also work built under an existing deck or overhang that already counts toward coverage. Any new foundation on the sloped side could also bring in erosion-hazard review, a geotechnical letter, a stormwater plan, and a grading plan if you move more than 50 cubic yards.

The sewer question nobody asks

This house is on a City STEP sewer, meaning there's a tank and pump on the property. Two things follow. First, the tank and line locations limit where an addition can go. Second, tank capacity compared with bedroom count is worth confirming with Edmonds Public Works before you design. I put that on the list for every STEP property we look at.

What I tell buyers

1. Pull the permit history before you fall in love with the bedroom count. It's public, and it takes ten minutes.
2. If the bedroom isn't permitted, assume the City may want existing work brought up to code when you permit new work.
3. Measure the existing window: clear opening, height, width, and sill height. Measure the ceiling under the ducts.
4. Ask for the original plans from the City's archive. A 1962 plan set can show what the lower level was supposed to be.
5. In a 1962 house, test for asbestos before demo. That means flooring, mastic, and drywall texture.

FAQ

Can I just call the room a bedroom when I sell?

A listing can say whatever the seller wants, but a buyer, appraiser, or the City may not count it. If it doesn't meet egress and ceiling height, expect it to be called non-conforming.

Do I need a permit to finish a basement bedroom in Edmonds?

Yes, in my experience a lower-level conversion means a residential alteration building permit, plus plumbing, mechanical, and electrical as needed. Confirm your scope with the City.

Is a sliding door enough for egress?

A door to the exterior can serve as the emergency escape opening under R310. Whether a slider in the rec room helps a bedroom depends on whether it opens from that bedroom. Usually it doesn't.

What does a lower-level bedroom cost?

It varies too much to quote without seeing the house: window cut, ceiling, moisture, electrical. We price it after a site visit.

Sources: IRC R304, R305, R310, R314, R315 as adopted by WAC 51-51; ECDC 16.20.030 (https://edmonds.municipal.codes/ECDC/16.20.030); City of Edmonds handout B61, Residential Remodels and Additions; MyBuildingPermit public permit search (https://permitsearch.mybuildingpermit.com).

Pacific Pro Group, design-build remodels and additions. Edmonds: 144 Railroad Ave #307, (206) 446-5656. Seattle office in Leschi.