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Commission denies Third Street waiver request that would have raised impervious coverage and reduced rear setback
Summary
The commission voted 4‑1 to deny a homeowner’s request to reduce a rear setback from 20 to 9 feet and raise the lot’s impervious surface ratio from 60% to 63%; staff and the floodplain reviewer had raised concerns about drainage and precedent.
The City Commission on Aug. 4 denied a waiver request from 2410/521 Third Street North seeking a reduced rear setback and a slight increase in the property’s impervious surface ratio.
Homeowner Ed Offner proposed a screened porch addition that would reduce the rear setback from 20 feet to 9 feet and add roughly 155 square feet of impervious surface, raising the lot’s impervious-surface ratio from about 58% to 63% (the code maximum without a pool is 60%). Offner said the design included gutters that would discharge to an existing drainage swale and that nearby neighbors supported the project.
City staff and the floodplain reviewer raised concerns about increasing impervious coverage in the Community Redevelopment District, noting that imperviousness is a critical factor in runoff and flood risk. Engineering staff recommended any approval be conditioned on detailed drainage measures and permit review.
Commission debate focused on precedent and the city’s broader stormwater and flood concerns. Several commissioners said they were reluctant to approve an impervious‑ratio waiver in a district vulnerable to drainage issues. The motion to deny the waiver passed 4‑1.
Why it matters: the decision preserves the existing impervious‑surface standard in the historic downtown CRA neighborhood and signals strict scrutiny of changes that could increase runoff or complicate floodplain management. Staff noted that, if a homeowner wants a larger addition while exceeding impervious limits, the appropriate path may be a code amendment or a different variance process that fully engages technical review and neighborhood impacts.
Details: the applicant’s packet stated the lot was at 58% impervious coverage and the addition would add 155 square feet, bringing the property to about 63% coverage. The technical review committee and floodplain reviewer recommended caution or mitigation conditions; commissioners concluded denial was appropriate and voted 4‑1.
