Lynnwood Crawl Space Repair

Lynnwood is mapped in a single soil survey area, and in it one map unit dominates. Alderwood-Urban land complex on 2 to 8 percent slopes covers 64.2% of the mapped area, and the same complex on 8 to 15 percent slopes another 7.8%. Both mix Alderwood soil with Urban land, and the survey rates both moderately well drained, which is why 77.6% of the city falls in that class, the fourth-highest share of the nineteen. The unrated 12.0% is almost all Urban land on its own (11.0%), with a small area of pits.

The wet-rated ground is made of three named soils. McKenna gravelly silt loam on 0 to 8 percent slopes covers 5.2% of the mapped area and is rated poorly drained; Mukilteo muck covers 2.3% and is rated very poorly drained; Norma loam adds 1.2%, poorly drained. Together they account for nearly all of the city’s 8.9% in the wetter classes.

On the dominant unit, the soil map is a weak explanation for a wet crawl space; roof water, grading and the way hard surfaces around the house shed water are the first things to check. On the silt loam and the muck, the rating itself describes soil that holds water, and water rising from below becomes a real possibility. Neither reading replaces looking: the survey describes map units, not lots, and the soil under a particular house is found in the crawl space. What crawl space waterproofing covers explains the options when water is coming from below.

The Census counts 3,755 Lynnwood housing units from the 1960s, the city’s biggest decade, and 3,042 from the 1970s. The 1950s added 1,794, and everything before 1950 comes to only 355 units, 2.1% of the city. After 1980 the pattern is unusual: the 1990s added 2,594 units, more than the 2,027 of the 1980s, and building since 2000 comes to 3,445.

A house from the 1960s or 1970s may have its original floor insulation, insulation added since, or none, and replacing it can look like the obvious first job. The order still matters: the ground cover and the framing nearest the soil come before insulation, because new batts above bare or torn ground cover sit in the same damp air as the old ones. When insulation is the right next step, Snohomish County PUD pays $1.00 per square foot for floor insulation in electrically heated homes, where the existing insulation is R-11 or less and the new reaches R-30, done by a PUD registered contractor. Where PSE electricity or gas is the primary heat instead, PSE’s program applies, and it is limited to site-built homes from 1989 or before. Which utility serves a Lynnwood address is a question for the bill. The 2026 rebate guide sets out both programs.

The nearest published NOAA station to Lynnwood’s Census internal point is the Everett airport station, 5.5 miles away, slightly closer than it is to Everett’s own internal point. Its 1991–2020 annual normal is 33.37 inches, the lowest of the eight stations this site publishes, and it records the fewest days with an inch of rain or more, 2.5 a year. It still records 92 days a year with at least a tenth of an inch: the rain comes often and lightly.

Two more stations are inside 15 miles: Seattle’s Sand Point station at 10.0 miles, with 37.82 inches, and Monroe at 14.2 miles, with 50.77 inches. The 17.4-inch spread between them is why the dataset gives Lynnwood no rainfall figure of its own. The Everett airport averages 28.8 nights a year at or below freezing, against 25.0 at Sand Point, so a vented crawl space here sees a few more cold nights than one on the Seattle record; frozen pipes in a crawl space covers the checks.

Inside Lynnwood, the Development and Business Services department issues building permits and electrical permits alike, through the city’s Online Permit Portal, and L&I lists Lynnwood among the cities that run their own electrical permitting. A new circuit for a sump pump or a dehumidifier is a city permit here. Lynnwood’s list of work that needs no building permit has not been read here; ask Development and Business Services before assuming a crawl space scope is exempt.

A Lynnwood mailing address is no guarantee of a Lynnwood permit. ZIP code 98036 covers 50.2% of the city’s land, but only 41.2% of 98036 lies inside the city; 98037 covers 48.7% of Lynnwood and lies 66.4% inside it. Outside the city limits the permit office is another city’s or, in unincorporated Snohomish County, the county’s Planning and Development Services, and electrical permits there come from L&I. The city does not publish a neighborhood list; it plans by subareas it names City Center, Highway 99, College District, South Lynnwood and City Center Alderwood, which are planning areas rather than neighborhoods.

For October 1 to December 31, 2026 the Department of Revenue lists Lynnwood at 10.7%, the highest rate of the nineteen places, which Edmonds shares. Washington applies it to the whole contract price for repair work on a home, labor included; on a larger job the tax is a line worth checking on the quote, and the cost guide’s ranges are before it.