CASE STUDY

ADU Rules Start in the Minutes Long Before the Vote

Towns are rewriting their rules for backyard homes in 2026, and the reason shows up in their own public records first. In three towns that adopted new ADU rules this year, the first sign sat in their minutes 5 months to more than 3 years before the vote.

The pattern

Accessory dwelling units, or ADUs, are the backyard cottage, the apartment over the garage and the in-law suite on a single-family lot. States are pushing towns to allow them. Towns write the rest: which lots, how big, how tall, where the car goes, and whether it can be rented by the night. Those decisions are made in planning boards and council chambers, and they are written down.

It started in the minutes

5 months to over 3 years from the first sign in a town’s own minutes to the rule it adopted.

The first sign is the earliest point where the problem shows up in the town’s own record: a homeowner’s wasted plans, a state law the town’s code now breaks, a worry about older neighbors.

Pick a town to follow the thread:

Clinton · 6 moKeene · 5 moHighland · 40 mo

6 monthsfirst sign to adopted ordinance · 201 days
Clinton, Utah

FIRST SIGN
Feb 5, 2026

City staff told the Planning Commission that homeowners had sent in ADU applications that did not qualify and had “already spent money on drawings that cannot be used.” Staff proposed a check before the building permit. Planning Commission minutes

THEN
Aug 25, 2026

The City Council adopted Ordinance 26-02Z, “proposed amendments to the Accessory Dwelling Unit standards,” by unanimous roll call. It adds a preliminary site-plan review before the building permit and clears up foundations for detached ADUs and tiny homes. At the hearing, a resident in “the final stages of constructing an ADU” spoke in support. City Council minutes

5 monthsfirst sign to adopted ordinance · 156 days
Keene, New Hampshire

FIRST SIGN
Oct 14, 2025

City staff told a joint planning committee that “City Code is currently in violation of a few things that were recently passed by the State Legislature.” First on the list was ADUs: the state used to require a door between an attached ADU and the house, then “got rid of that requirement and now they say you can’t require it.” Committee minutes, filed with the Jan 12, 2026 packet

THEN
Mar 19, 2026

The City Council adopted Ordinance O-2025-40, “Relating to Setback Exceptions, Accessory Dwelling Units, and Parking Regulations,” on a 14-0 roll call. City Council minutes

40 monthsfirst sign to adopted ordinance · 1,225 days
Highland, Utah

FIRST SIGN
Apr 25, 2023

Planning commissioners “discussed their support for granny flats/mother-in-law apartments that are detached from the main dwelling” and “shared their concern for the older Highland residents that would like to stay in Highland but can no longer take care of their acre+ sized lots.” Planning Commission brief

THEN
Sep 1, 2026

The City Council voted 5-0 for an ordinance “establishing new detached ADU (DADU) regulations.” Detached ADUs are now allowed on lots of 11,000 square feet or more, up to 25 feet tall and 1,250 square feet of living area. City Council brief

Where it is on record now

Hollis, New Hampshire

The town planner told the Zoning Board on September 24, 2026 that ADUs “are hot right now; everyone is building an ADU, and they are everywhere. They are coming to the Building Department on an almost daily rate, and nearly every one of them is pushing the envelope in one way or another.” He raised cutting the size limit from 800 to 750 square feet, and the board’s chairman wants residents to vote on the changes.

Source: Zoning Board draft minutes, September 24, 2026

Amherst, Massachusetts

On September 28, 2026 the Town Council voted 12-0 to send zoning changes “to address concerns regarding Accessory Dwelling Units” to its Planning Board. A resident spoke about an “ADU built next to home,” and councilors raised that neighbors get no notice when an ADU is being built. A joint hearing is expected on October 22.

Source: Town Council minutes, September 28, 2026

Ipswich, Massachusetts

At an August 13, 2026 hearing on a new ADU bylaw for the October 20 Special Town Meeting, one resident “has an ADU and does not want restrictions on short-term rentals.” Another “said short-term rentals should not be allowed.” A Zoning Board member noted that “Short-term rentals are considered commercial use.”

Source: Planning Board minutes, August 13, 2026

+More towns on the record

These three show the range: a building rush, a neighbor’s complaint, a fight over nightly rentals.

Why it matters

Who may build an ADU, how big it can be and whether it can be rented are decided town by town. For anyone who builds, sells, finances or insures backyard homes, the next rule is already taking shape in a town’s minutes, often months before the vote. Tell us your market in the box below, and we will look for it there.

METHODOLOGY: Every example above comes from the town’s own record, linked beside it. Agendas and packets show what was proposed; we say adopted only where minutes or the town’s own record of the vote show it. Where a record comes from draft minutes filed with a later packet, the source says so.

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