Do I need a building permit
in Keene, NH?

Do I need a permit in Keene, NH?

What's specific to Keene permits

Keene's granite bedrock and glacial soils mean frost heave is a real structural issue, not an abstraction. The 48-inch frost depth applies to all permanent footings — deck posts, sheds, fence posts, anything that sits directly on the ground. The IRC allows 36 inches in milder zones; Keene doesn't. If you're digging footings in the fall, expect the frost line to reach full depth by January. Many homeowners dig in November, think they're below frost, and then watch the ground heave in February. The building inspector will ask for footing depth and detail on your plan — 'below grade' is not enough. Give them the number. The same rule applies to foundation walls and basement work: anything below grade needs to be below 48 inches, and the inspector will want to see where you're starting the measurement (finished grade, usually).

Keene's local zoning ordinance controls lot coverage, setbacks, and height limits in residential districts, and it's stricter than many surrounding towns. Most single-family zones require a 25-foot front setback, 15-foot sides, and 30-foot rear. An attached deck or addition that violates those setbacks needs a variance from the Zoning Board of Adjustment, not just a building permit. The building department won't issue a permit for work that violates zoning unless you have a variance in hand. A lot of applicants discover this after they've already hired a contractor. Check your lot dimensions and your project footprint against the zoning ordinance before you start design work. The building department can confirm whether variance is needed — a quick call at (603) 352-0133 (or the current department number) can save weeks.

Electrical and plumbing subpermits are required and are filed separately from the building permit. If you're doing electrical work (a new circuit, a panel upgrade, an addition's wiring), you need an electrical subpermit. If you're running new water lines or drains, you need a plumbing subpermit. Owner-builders can pull these themselves, but many hire licensed electricians and plumbers, who file the subpermits as part of their scope. Don't assume the electrician will file it; ask upfront. The same applies to mechanical (heating, AC): if you're replacing or extending HVAC, that's a separate permit. The building permit alone won't cover those trades.

Keene does not currently offer full online permitting through a public portal, though the city is gradually moving toward digital submission. As of now, you file in person at the City Hall Building Department or by mail. Bring or submit: completed permit application, site plan showing property lines and setbacks, floor plans and elevations for the work, and any trade-specific details (footing detail for decks, electrical riser for panels, etc.). The department processes routine permits (decks, sheds, roofing) over-the-counter in 2–5 business days if the paperwork is complete. Additions and new construction take longer — plan for 2–3 weeks of review and back-and-forth. Asking questions during intake saves time; showing up with incomplete paperwork costs weeks.

Winter construction in Keene brings inspection delays. Frost-line verification inspections (required for decks, footings) are much easier in May–September when the ground is accessible and frost is not actively moving. If you're planning a winter project, expect the final footing inspection to be scheduled for spring unless conditions are exceptional. Inspectors will postpone footing inspections from November through March in most cases — they can't accurately verify depth when the ground is frozen or actively heaving. Plan your schedule accordingly. The same applies to grading and drainage inspections for foundations and additions.

Most common Keene permit projects

These are the projects that land on the Building Department desk most often. Each has its own local quirks — setback requirements, frost-depth impacts, energy-code thresholds. Click through to the details.

New Hampshire context for Keene permits

New Hampshire adopted the 2015 International Building Code with state amendments. The state does not have a residential energy code separate from the IRC; the 2015 IECC is built into the IBC, and Keene enforces it. This matters for additions and new construction: insulation values, window U-factors, and air-sealing details are reviewed by the building department. Owner-builder permits are allowed for owner-occupied single-family homes and duplexes in New Hampshire — you can be your own general contractor — but you're responsible for code compliance and you'll be required to inspect more frequently. Electrical and plumbing work in New Hampshire do not require a separate state license for owner-builders (unlike some states), but the work must be to code and is subject to local inspection. Keene enforces the state code consistently; there are few local amendments. Frost depth is the big regional driver: 48 inches applies statewide in the Keene area. Septic systems and well permits are handled by the state DES and local health department, not the building department — make sure to file those separately if you're adding living space or plumbing.

Common questions