Deck building
in Leavenworth

Leavenworth adopted the 2018 International Codes on May 1, 2020. The city applies the 2018 International Residential Code to single-family homes, duplexes, townhomes and accessory structures, covering new structures, additions, renovations and repairs. Neither the deck page nor the residential construction page publishes a size or height exemption for decks, so a deck or porch project in Leavenworth starts from the assumption that a permit applies.

Licensing is set locally too. The deck and porch page states that the City of Leavenworth does not require a business license or a contractor's license for general contractors. Trade work is the exception. Electrical, mechanical and plumbing work need their own permits, and the people doing that work need city trade licenses, so a deck with a new outlet or stair light involves a licensed electrician and a separate electrical permit alongside the building permit.

Leavenworth's deck permit is submitted by email to the Inspections Department, and it has two parts: the deck and porch permit application and a signed requirement agreement. The city expects the application to be filled out completely, including the estimated cost of the project, the total square footage, the dimensions of the structure, and a phone number and email address for follow-up. The city also notes that starting July 1, 2025, the estimated valuations it uses for decks increased.

The requirement agreement the city links is a Planning and Zoning checklist. By signing it, the applicant acknowledges that the following must be submitted and that missing items will delay the review:

Site plan

distances from the property lines to the deck, distances to other structures on the lot, and the structure's dimensions and total square footage, including any porches

Letter of intent

name, signature and date, the property address, and the use of the property, such as owner occupied or rental

Image or rendering

a drawing or representative image that shows how the finished structure will look from all exterior sides

Material list

a list of all materials used in construction, or the manufacturer's packet for a prebuilt structure

The deck and porch page describes the site plan as an aerial view of the property showing its boundaries, the house, other significant structures and the setback distances to the new deck. The city's interactive GIS map provides the aerial image to draw on. Setback requirements are handled by Planning and Community Development rather than the inspections staff. Because those distances can cap how far a deck extends toward a lot line, a deck builder in Leavenworth measures them from the aerial before settling the deck's footprint.

Leavenworth's historic districts add a second review for some projects. The city's Historic Preservation page states that any proposed change to a property listed on the National or State Register of Historic Places, within a registered historic district, or designated a local landmark requires a state law review, a Certificate of Appropriateness, or both, under the Kansas preservation statute, K.S.A. 75-2724. A new deck, a rebuilt porch or new steps on one of those properties is a proposed change, so it goes through that review in addition to the building permit.

The city lists eight historic districts: Downtown, Arch Street, North Esplanade, South Esplanade, North Broadway, Union Park, Third Avenue and the Historical Industrial District. The Third Avenue Historic District shows why porches draw attention in that review. Its houses were built between 1859 and 1920, and the city's descriptions record one-story wraparound porches with slender Ionic columns and decorative balustrades, porches on tapered round wood columns, square-section balusters and newels, and a two-tiered back porch with a screened sleeping porch on the upper level.

On houses like these, porches are among the features the city's district descriptions record. New guards still have to meet the 36-inch height and 4-inch opening rules where they apply, so a deck builder in Leavenworth fits current code to the proportions of the original columns, railings and steps.

Leavenworth has an old housing stock. The median home in the city was built in 1969, according to Census Bureau American Community Survey estimates for 2020 to 2024. About 28 percent of its homes date from 1939 or earlier, about 41 percent from before 1960, and only about 18 percent from 2000 or later.

That age shows up in the outdoor structures. Porches, steps and decks built decades ago were framed to the rules of their time. Footings may be shallower than 36 inches, railings may be lower than current guards, and steps may be steeper than the residential code now allows. Repairing a few boards leaves those conditions alone. Rebuilding the structure under a permit means the new porch, steps or deck follow the 2018 code and the city's 36-inch footing rule, which can change the height of the railing or the number of steps at the entrance.