City Home Rules

Selling a house in Princeton, NJ: what the city requires

Mercer County, New Jersey · Last checked November 2026

Required at sale

Princeton requires a smoke/CO/extinguisher cert before settlement. Valid six months. NFPA 72 report from a certified alarm company for any house with a fire-alarm system.

What Princeton requires

Smoke/CO/extinguisher cert

Who does it
Municipal fire official or construction office. The seller applies.
Cost
See municipality

Housing in Princeton

Median year homes were built
1965
Median home value
$1,050,600
Owner-occupied homes
5,149 of 9,300 (55%)
Total housing units
9,906

Homes here are typically from 1965 or later, so inspections tend to focus on safety items like smoke and CO alarms, GFCI outlets and handrails.

Source: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates for Princeton, Mercer County, New Jersey.

Need this done in Princeton?

Get quotes from a local contractor for resale certificate repairs, help with repairs, or a cash offer to sell as-is. We pass your request to independent local providers. Free, no obligation.

What do you need?

How the new jersey resale certificate process works

Every New Jersey home sale needs a certificate showing working smoke alarms and carbon monoxide alarms, issued by the local fire official. Many towns also require their own resale certificate of occupancy (CO or CCO), which can add a property maintenance inspection.

  1. Apply to the local fire official, or the construction office, as soon as you list. The state fee is lowest when you apply more than 10 business days before closing.
  2. Install smoke alarms on every level and outside sleeping areas, and a carbon monoxide alarm near sleeping areas if the home has fuel-burning appliances or an attached garage.
  3. If the town also requires a resale CO, schedule that inspection and fix the listed items, or ask about a temporary certificate or buyer assumption.
  4. Give the certificates to the title company before closing.
Typical cost ranges (estimates, not quotes)
ItemTypical range
State smoke/CO certificate fee$45 to $161, depending on lead time
Municipal resale CO$45 to $250
Ten-year sealed smoke alarm$25 to $60 each

Read the full new jersey resale certificate guide

Other towns with the same requirement: Smoke and CO detector certificate

If the house fails

You can repair before closing, use an escrow or extension where the city allows it, let the buyer assume the work for a credit, or sell as-is. Compare the options.

Frequently asked questions

What does Princeton require before I sell my house?

Princeton requires a smoke/CO/extinguisher cert before settlement. Valid six months. NFPA 72 report from a certified alarm company for any house with a fire-alarm system.

How much does the smoke/co/extinguisher cert cost in Princeton?

See municipality Typical related costs: state smoke/co certificate fee $45 to $161, depending on lead time; municipal resale co $45 to $250; ten-year sealed smoke alarm $25 to $60 each.

What if my house fails?

You can make the repairs before closing, negotiate a credit with the buyer, or sell as-is to a buyer who will handle the work. Ask the municipality whether it allows a buyer to assume the work or an escrow.

Who pays, the buyer or the seller?

The ordinance usually makes the seller responsible for ordering it, but who pays for repairs is negotiable in the purchase agreement.

How old are the homes in Princeton?

The median home in Princeton was built in 1965, and the median home value is $1,050,600, according to the Census Bureau's 2020-2024 American Community Survey.

Nearby: South & Central New Jersey

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Sources

Last checked November 2026. Rules and fees change by ordinance and resolution. Confirm with the municipality before you list. See something out of date? Report a change.