Buxton residents will have opportunity to speak up on Monday about a number of regulatory changes that will face town voters in June.

Proposed ordinance changes to be discussed in the Planning Board public hearing would include adding a marijuana ordinance, reducing the size of the town’s Planning Board, and adopting fire protection rules involving sprinkler systems. But, Buxton Code Officer Fred Farnham said on Tuesday that adoption of a fire protection ordinance as proposed would not apply to existing one- or two-family residences.

The public hearing is set for 7 p.m. on Monday, March 23, in Buxton Town Hall, 185 Portland Road. Town Clerk John Myers said Tuesday any ordinance change would require approval of voters at town meeting in June.

According to language outlining the purpose of the fire protection proposal, the ordinance would “protect the health, safety and general welfare of the residents of Buxton by establishing fire protection measures for residential and commercial occupancies.”

Buxton is not served by public water.

Buxton Fire Chief Nathan Schools said Tuesday the proposed ordinance is similar to ones in other communities like Gorham.

“It’s built around essentially what others have used, but tailored to Buxton,” Schools said.

A new, single-family home on a single lot would not be required to have a sprinkler system. Enlargements, alterations or renovations exceeding 25 percent of areas of buildings with three or more units would be required to be sprinkled under a town ordinance.

New housing developments with five or more homes also would be impacted under the proposed ordinance, according to Schools. A developer would have an option of providing a holding cistern or a fire pond for fire protection in lieu of installing individual sprinkler systems in homes.

Farnham estimated a sprinkler system would add $5,000 to $10,000 to the cost of building a new, single-family home. A sprinkler system would also require a water storage tank in a basement or garage.

For a development, Schools said, a holding cistern could cost $35,000, as compared to installation of a fire pond that could run $50,000 or more.

Farnham doesn’t believe Monday’s hearing would become adversarial, but questions whether the town is ready for a change.

“I think people will be ready to listen,” Farnham said.

In another change that effects elected officials, the number of positions on the town’s Planning Board would shrink from seven to five members. The board currently has seven members but a town charter change approved last year calls for five members, Myers said.

The charter change becomes effective in June. So the ordinance amendment proposed would become a “housecleaning” item, Myers said.

Planning Board terms expiring in June include those of Keith Emery, chairman; Lawrence Curtis, treasurer; Christopher Baldinelli and Chad Poitras. Only two seats will be available on the ballot in the municipal election.

The town is also looking at instituting a medical marijuana ordinance with a batch of requirements. Outdoor cultivation of marijuana in Buxton would be banned and locations of registered dispensaries would be regulated.

Monday’s meeting will also hear public comment on an amendment to the town’s zoning map. A 2,700-foot stretch along the south side of Narragansett Trail (Route 202) and running northeast from Pease Road would be switched from the residential district to the business and commercial district.

In addition, the town’s Board of Selectmen at 7 p.m. on Monday will hear public comment about proposed changes to the road acceptance regulations.