Can you build a PSL Modular unit in Delaware?

Delaware administers building codes primarily at the county and municipal level rather than through a single statewide building program. In practice, a modular unit is built to the codes adopted by your county/town and is inspected at the factory by an approved third-party inspection agency; the labeled unit is then accepted by the local building department, which permits the site work — foundation, utilities, zoning. Confirm the specific adopted codes with your county.

At the county level, yes — notably Sussex County. In June 2024, Sussex (the beach county) adopted an ordinance removing the requirement to seek a Board of Adjustment special-use exception for an ADU, allowing ADUs up to 1,000 sq ft, attached or detached (including finished interior space like a basement), one per lot, with the owner generally residing in one of the dwellings. New Castle and Kent counties have their own rules.

Yes, and Sussex County's 2024 changes made it more straightforward. You'll still meet setbacks, height limits, and adequate water/sewer, and on coastal/flood-zone lots you'll need to elevate to base flood and build to coastal wind. PSL Modular engineers and elevates the unit accordingly.

The coast. Rehoboth, Lewes, Bethany, and the Delaware Bay shoreline carry coastal wind and FEMA flood elevation requirements (piling foundations). Inland Delaware is mild with low snow and low seismic. PSL Modular sets the wind/flood spec from your site.

Yes — the Delaware beaches are a strong seasonal rental market, and modular places a finished, coastal-rated unit quickly. The third-party label clears the building; your work is the county/town zoning (and any STR rules) plus flood elevation and wind engineering.