Zoning, building permits and septic rules in Town of Jefferson, New Hampshire
Town of Jefferson is a town in Coos County, New Hampshire. Town of Jefferson adopts its own zoning, so inside its limits Town of Jefferson’s rules apply, not the county’s. Septic permits inside Town of Jefferson come from the state health agency. 20 rules below are quoted from official sources and independently re-checked, most recently on October 29, 2026. Rules for unincorporated land are on the Coos County page.
Answers from the rulebook for Town of Jefferson
Town of Jefferson’s own rules
Building permitRequired
New construction in Jefferson town under the town's building permit process
Replacement, refurbishing, or repair of an existing structure that does not infringe setback or height limits needs no approval (Art. VI, Sec. 1.c).
An approved building permit is valid for 1 year from the date of approval (building permit form).
“an approval in writing be secured from the board of selectmen plus an approval review fee based on administrative cost to be paid before any construction is commenced.”
Building code adoptedPartial
New construction and substantial improvements in Jefferson town (energy code only)
The ordinance adopts only the New Hampshire energy code (RSA 155-d), referencing IECC 2000; it does not adopt a full model building code.
A certificate of compliance from the NH Public Utilities Commission must accompany a building permit (Art. V, Sec. 8).
The permit form says NH state building codes require a heating-system pre-installation inspection.
“certificate of compliance from nh public utilities commission must accompany a building permit.”
InspectionsRequired
Installation of a heating system in a building in Jefferson town
The form says the pre-installation inspection is performed by the Jefferson fire department.
The applicant is responsible for obtaining all required inspections (building permit form).
Inspections for other work were not stated in the form; no general inspection schedule was found.
“nh state building codes require a pre-installation inspection for any heating system to be preformed by the jefferson fire department.”
Local zoningPresent
All land inside Jefferson town limits, under the town's own Land Use Plan Ordinance
The ordinance is titled Land Use Plan Ordinance; its cover states it was adopted March 1987 with last revision adopted March 2025.
Enforcement is by the board of selectmen or their designee; special exceptions and variances are approved by the board of adjustment (Art. VII).
“town of jefferson, new hampshire land use ordinance adopted march 1987 last revision adopted march 2025”
Minimum lot sizeSpecified
Single-family dwellings (year-round residence, camp, or vacation home) on any lot in Jefferson town; one town-wide standard, no district schedule found
Only one dwelling per lot is permitted (Art. IV, Sec. 1.d).
Manufactured homes count as single-family dwellings and must conform to the same lot size (Art. IV, Sec. 1.b).
Cluster developments under Article IX may reduce individual lot sizes while keeping overall density, with planning board and board of adjustment approval.
minimum lot area: >= 2 acres (cluster developments under Article IX may have smaller individual lots)
“each single-family dwelling (year round residence, camp or vacation home) shall be placed on a lot of 2 acres or more in area.”
One more reviewed finding on this topic
Specified — Two-family attached dwellings on any lot in Jefferson town; one town-wide standard, no district schedule found
“two-family attached dwellings shall require a minimum lot size of 3.75 acres.”
SetbacksSpecified
Every structure on any lot in Jefferson town; one town-wide standard, no district schedule found
Setback is the approved distance from property lines for any structure, dwelling, dwelling unit, storage unit, or tent, whether permanent or temporary (Art. III, Sec. 4 definitions).
A building permit application not meeting Article IV must first apply for a variance from the board of adjustment (Art. VI, Sec. 1.d).
minimum distance from each property line: >= 50 feet
“every structure on a lot shall be at least 50 feet from each property line.”
One more reviewed finding on this topic
Specified — Structures, septic systems, leach fields, and paved areas on any lot in Jefferson town near a year-round stream or body of water
“no structure or any portion thereof, including any septic system, leach field or paved area shall be located within 75 feet of a year-round stream or body of water.”
Building heightSpecified
Structures on any lot in Jefferson town; one town-wide standard, no district schedule found
The restriction does not apply to non-dwelling type farm buildings (Art. V, Sec. 3).
The definitions in Art. III, Sec. 4 measure height from the lowest natural elevation of the building site and exclude churches, non-dwelling buildings, farm buildings, and chimneys; the two measurement rules differ and were not reconciled in the ordinance text.
maximum structure height: <= 30 feet (non-dwelling type farm buildings) · maximum stories: <= 2.5 stories (non-dwelling type farm buildings)
“no structure erected on any lot shall exceed 30 feet or 2 ½ stories in height (measured from the horizontal grade line), whichever is less; except that this restriction shall not apply to non-dwelling type farm buildings.”
Living in an RVLimited
Recreational vehicles placed on sites inside FEMA zone A special flood hazard areas in Jefferson town
Applies only inside zone A special flood hazard areas under the town's floodplain development ordinance (Art. V, Sec. 9).
A recreational vehicle is a unit of 400 square feet or less on a single chassis, designed for temporary living, not as a permanent dwelling (Art. III, Sec. 4 definitions).
Outside special flood hazard areas, the ordinance text read did not contain a general RV occupancy rule; see the unknown RV claim.
“recreational vehicles placed on sites within zone a shall either (i) be on the site for fewer than 180 days; (ii) be fully licensed and ready for highway use, or (iii) meet all standards of section 60.3 (b) (1) of the national flood insurance program regulations”
Manufactured homesAllowed
Pre-site built or manufactured housing units used as dwellings in Jefferson town
Manufactured homes must conform to the same lot size as single-family dwellings (Art. IV, Sec. 1.b).
In special flood hazard areas, manufactured homes must be elevated on a permanent foundation and anchored (Art. V, Sec. 9, item viii.2.d).
“manufactured homes shall be considered as single-family dwellings and shall conform to the same lot size.”
Accessory dwellingsLimited
Accessory dwelling units on lots in Jefferson town
Listed among uses that the board of adjustment may permit as special exceptions (Art. III, Sec. 2; amended 3/2024).
Article XI (Accessory Dwelling Units, adopted March 14, 2017) sets further conditions that were not read in the first pass; see followups.
“the following additional uses may be permitted by the board of adjustment (see art. vii) and shall be considered as special exceptions”
Subdividing landRegulated (with conditions)
Residential and commercial subdivisions and boundary line adjustments in Jefferson town, reviewed by the planning board
Commercial subdivisions require a special exception (forms page).
The forms page links Subdivision Regulations with an appendix adopted May 2019 (file name); its text was not read.
Cluster developments under Article IX of the ordinance are administered by the planning board.
Fees on the building permit form are listed by structure type and whether a heating-system inspection applies; the form lists residential $25, residential with heating inspection $50, addition $10, addition with heating inspection $40, other structure with heating inspection $40, other structure without heat $10.
Ordinance Art. VI, Sec. 1.a also requires an approval review fee based on administrative cost for new construction; no amount is published in the text read.
The fee schedule is undated on the form file (uploaded 2023/07).
residential building permit review fee (no heating system inspection): 25 USD (no heating system inspection) · residential building permit review fee with heating system installation inspection: 50 USD (with heating system installation inspection)
“permit review residential (no heating system inspection): $25___”
Permit processPartial
Building permit process for new construction in Jefferson town
Steps published: site plan with contours and elevations, written approval from the board of selectmen, approval review fee paid before construction; variance first if Article IV is not met (Art. VI, Sec. 1).
The building permit application form is posted; the separately linked Building Permit Instructions PDF returned no extractable text, so its steps were not confirmed.
“building permit instructions building permit application”
Rules another office applies inside Town of Jefferson
Town of Jefferson does not set these itself; the county, a health district or the state does, and they apply to every address inside its limits.
Who permits septicState (with conditions)
Sewage (septic) systems serving new construction in Jefferson town; the New Hampshire Department of Environmental Services gives the pre-approval
The town's permit form says any sewage system must be pre-approved by NHDES.
The town ordinance adds siting limits for septic systems (75 feet from year-round water, Art. V, Sec. 5) but does not appear to name a local septic approver.
“i understand that any sewage system installed must be pre-approved by new hampshire dept of environmental services.”
Septic permitRequired
New sewage (septic) systems in Jefferson town require NHDES pre-approval before installation
Pre-approval is by NHDES, not the town (building permit form).
The ordinance limits septic siting near water (Art. V, Sec. 5).
“i understand that any sewage system installed must be pre-approved by new hampshire dept of environmental services.”
Still unanswered
We looked and could not find an official answer yet. Silence is not permission; ask Town of Jefferson or Coos County directly.
Owner-builder exemption — Owner-builder exemption for building in Jefferson town
Certificate of occupancy — Certificate of occupancy for a new dwelling in Jefferson town
Zoning districts — Zoning districts in Jefferson town
Minimum dwelling size — Minimum floor area for a dwelling in Jefferson town
Lot coverage — Maximum lot coverage in Jefferson town
7 more unanswered
Camping on your land
Tiny homes
Septic inspection
Off-grid sanitation
Well permit
Mandatory utility hookup
Agricultural exemption
Each answer was extracted from an official source and independently re-checked against that source by a second reviewer. That is an evidence check, not legal advice. Rules change; confirm with the authority before you buy or build.
Unanswered questions are usually a sign that Town of Jefferson publishes no rule on the point, not that none exists. Coos County’s page lists the county offices to call.
Off-grid gear
Going off-grid in Town of Jefferson means bringing your own water and power. The kit we’d start with:
