City staff and attorney outline major edits to Alpine zoning code; council debates smaller lot sizes and ADUs

City planning staff and the city attorney presented a comprehensive update to Appendix C of the Alpine Code of Ordinances at the March 18 council meeting, describing a 56-page redraft that consolidates definitions, modernizes building-material language and clarifies procedures for home occupations, accessory dwelling units and nonconforming properties.

Jessica, the staff member who led ordinance drafting work, told council the update incorporates the 2021 International Building Code definitions and added explicit language for home-occupancy rules and accessory dwelling units (ADUs). She said some of the biggest substantive changes reviewed with the Planning & Zoning Commission were a proposed reduction of minimum residential lot sizes (Jessica said she had tested a reduction by 2,000 sq ft across residential zones) and clearer language allowing nonstandard building techniques (including connex/container homes) in the city’s highest-density residential zone (R-4).

City attorney Cynthia (surname not given) advised council on legal constraints. She told members that recent state law changes limit a municipality’s ability to prohibit building materials that appear in the latest editions of the International Building Code and warned that “a city cannot control the conveyance” of a parcel — meaning a municipal ordinance cannot prevent a landowner from selling a lot even if the lot’s size or shape later makes development impractical under local rules. She also recommended further executive-session discussion and review about changes affecting the Board of Adjustment and the Building Standards Commission because those changes have legal and governance implications.

Why it matters: The rewrite touches on topics that shape housing availability and neighborhood character — minimum lot sizes, how many separate dwellings can exist on a parcel, what construction materials are allowed, and how nonconforming structures are treated after damage or alteration. Several council members voiced concerns about unintended consequences of smaller lot minimums; Councilmember Albert Stevens asked where the draft would allow duplexes, ADUs or multiple rental units and whether existing short-term-rental activity could effectively create hotel-like outcomes in residential zones.

Key points from the discussion: - Nonconforming structures: The draft keeps an existing 50%-damage rule carried in the current ordinance: if a nonconforming structure is destroyed or damaged above the stated threshold, rebuilding must meet current rules. Jessica said the 50% provision was not new but moved for clarity. - Connex/container homes: Jessica and Cynthia noted state building-code changes make certain nonstandard materials lawful building materials if they appear in recent IBC editions; Cynthia said the legal team will confirm how accessory-structure rules apply to containers as dwellings. - Minimum lot size: Staff tested lowering some residential minimum lots to 5,000 sq ft (from 7,000 in some zones); several council members asked planning staff to produce a parcel map analysis to show where splits or new development would become possible under smaller minimums. - R-2 and ADUs: The draft allows accessory dwelling units when built to code, but the council discussed whether an R-2 property could end up with multiple standalone rental units (primary structure plus ADUs) and whether that outcome matches the city’s goals.

Council asked staff to prepare visual parcel-impact maps showing which lots would be affected by smaller minimums and to return with a refined draft. Legal counsel and staff agreed to hold a separate executive-session discussion about the Board of Adjustment and building-standards items cited by the attorney.

The draft is slated for a first reading on April 1 and a second reading later in April, but Cynthia warned that pending state legislation (council members mentioned HB 1835 as an example of the kinds of bills under consideration) could require further changes if enacted.