Subdividing Land in Williams County: A New, Tighter 2-Acre Minimum

What an "unplatted subdivision" means in Williams County

In Williams County's own terminology, an "unplatted subdivision" is the proposed division of land in the unincorporated county that creates one or more parcels of 20.0 acres or less. This is the everyday scenario that comes up when someone owns, say, a 40- or 80-acre farm parcel and wants to carve off a smaller lot -- for their own homesite, for a family member to build on, or to sell separately. These divisions are reviewed by the Williams County Regional Planning Commission under Article IV of the county's Subdivision Regulations, which sets the minimum standards any newly created lot has to meet before it can be recorded and built on.

What changed, effective December 11, 2025

Williams County's Board of County Commissioners adopted amendments to those Subdivision Regulations that took effect December 11, 2025. Three standards changed at once, all in the direction of larger, more spread-out lots: the minimum lot size for a new unplatted subdivision lot rose from 1 acre to 2 acres; the minimum road frontage required for a new lot rose from 150 feet to 200 feet; and the county added a new 90-foot building setback measured from the centerline of the road, where none of that specific centerline-based figure existed as clearly before. Reporting on the change did not specify a stated rationale in detail, but the direction of the change -- larger minimum lots, more frontage, a defined centerline setback -- is consistent with a county trying to reduce the density of new unplatted lots splitting off along its road network.

What this means if you're buying an existing smaller lot

If you're looking at a Williams County lot that's already under an acre, or under 150 feet of frontage, that doesn't necessarily mean anything is wrong with it -- a lot legally created before December 11, 2025 under the old 1-acre/150-foot standard is very likely grandfathered in as a legal nonconforming lot, meaning it can typically still be sold, owned, and (depending on the specific township's zoning status, or lack of it) built on. What it does mean is that lot may not be a reliable template for what you can do with it going forward: if you were hoping to further subdivide that same lot, or an adjacent parcel you're buying alongside it, any new division created today has to meet the current 2-acre/200-foot/90-foot-setback standard, not the older, looser one the existing lot was created under.

Confirm directly with the Williams County Regional Planning Commission when a specific existing lot was legally created (a recorded plat or deed date is the simplest way to check) before assuming either standard applies -- and don't assume a real-estate listing or a seller's description of "buildable" or "can be split" reflects the current rule rather than the rule in effect when a neighboring lot was created years ago.

What this means if you're planning to subdivide a larger tract yourself

If your plan involves buying a larger tract with the intent of splitting off a smaller parcel -- for yourself, a family member, or a future sale -- plan around the new minimums, not older figures that may still show up in outdated online guides or a seller's assumptions: each new unplatted lot generally needs at least 2 acres, at least 200 feet of road frontage, and any structure needs to sit at least 90 feet back from the centerline of the road it fronts. A tract that comfortably supported three 1-acre splits under the old rule may now only cleanly support one or two 2-acre splits at the same frontage -- run the actual math on your specific parcel's road frontage and acreage against the new standard before assuming a subdivision plan pencils out, and start with a pre-submission meeting with the Williams County Engineer's Office, which the county requires before a subdivision application can move forward.