Huntersville board advances broad zoning text amendments on tree save, buffers, ADUs and stormwater

Huntersville’s Town Board on July 15 moved forward a coordinated set of text amendments to the town zoning and subdivision ordinances that change how the town treats tree preservation, buffer plantings, accessory dwelling units and stormwater facilities. Planning staff told the board the packets are intended to preserve more mature canopy and specimen trees on development sites and to clear long‑standing ambiguities in the code.

The amendments include a proposed cap on mitigation for tree save — staff’s draft would limit mitigation so that residential sites must retain roughly 70 percent of required tree save on site (mitigation capped at 30 percent) and commercial sites must retain roughly half (mitigation capped at 50 percent). Staff also proposed raising mitigation for heritage/specimen trees to a 200 percent caliper replacement factor and clarified submittal standards for tree preservation plans.

Staff said the change responds to a pattern in recent years in which applicants used payment in lieu or off‑site mitigation rather than preserving existing canopy. “We get some tree save, but we don’t get a lot because of this mitigation allowance,” Planning staff member Brad Priest said during the public hearing. He showed before‑and‑after examples that, under the proposed language, several past developments would have retained more mature canopy.

The package also includes separate but related amendments to buffer standards. Staff proposed explicit planting standards for opaque and semi‑opaque buffers (including a new 80‑foot buffer planting table for rural and transitional residential major subdivisions and farmhouse clusters), and a new town‑center edge buffer requirement of 20 feet for certain mixed‑use or apartment edges. An arborist worked with staff to size trees and shrubs so buffers perform as intended, staff said.

On residential building types and permitting, the board heard a separate staff proposal (TA25‑01) to disentangle residential use and building‑type definitions so that duplexes, triplexes and quadplexes are listed specifically where allowed, and to align the town process with recent state law for 1–4 unit dwellings (House Bill 488). The proposal would remove an unused registration step for accessory dwelling units (ADUs) and eliminate the rule that required the same person to own both a primary and accessory dwelling on a lot.

A different text amendment package addressed stormwater and land‑development process items. Staff proposed renaming “best management practices” to the state term “stormwater control measures” and adding a six‑month sunset for as‑built conversion submittals on projects whose temporary facilities are ready to convert; staff told the board about roughly 82 construction sites with temporary SCMs and said 30 percent are ready for conversion now. Staff said the sunset aims to reduce long‑running open construction files and to ensure treated stormwater reaches the system promptly.

Staff described other edits in the omnibus amendment: clarifying berm approval routing (removing an unnecessary extra Planning Board step), removing farmhouse clusters from the minor‑subdivision category (they allow more than five lots and have distinct standards), tightening urban open‑space limits so no more than 25 percent may be occupied by SCMs without rezoning, and removing several non‑life‑safety conditions from pre‑occupancy checklists to comply with state direction.

Board members asked technical questions about how the caps were derived, how the town will avoid “double‑dipping” when developers phase projects, and how an on‑staff arborist and code‑enforcement capacity would affect implementation. Commissioner Corals asked if staff had analyzed recent projects to compare actual retention with the proposed thresholds; Priest said any projects already vested would remain under old rules and that the new rules would not apply retroactively. Commissioner Walsh asked whether mitigation caps could render some land undevelopable; staff replied the conditional rezoning route would remain for projects needing relief on a case‑by‑case basis.

Several commissioners supported the package as advancing the town’s 2040 plan canopy goals, though a few suggested small tweaks to caps and stronger monitoring language. The Planning Board will review these text amendments at its next meeting and staff has proposed final board action on Aug. 19. The board’s action on July 15 moved the proposals forward for that next step.

Why it matters: the changes would shift the balance from off‑site mitigation and payments toward more on‑site retention of mature trees, standardize buffer plantings to produce predictable screening, and clarify how 1–4 unit dwellings (including ADUs) are regulated — all of which affect neighborhood character, stormwater quality and development costs.

What’s next: the Planning Board will consider the amendments at its scheduled meeting; final Town Board action is scheduled for Aug. 19. If adopted, the town will implement new submission requirements for tree and buffer plans and a six‑month conversion timeline for SCMs.