Although it's been a few years, I don't recall permits for our replacement windows. You can call the town and/or the company doing the install to double check for you. If a permit's needed, the company usually pulls it for the client unless you'd rather.
As a rule of thumb, permits are almost always required. I would call the township for the specifics in this case, but permits do give you some leverage over a contractor if they do a sub-standard job (you're not officially supposed to settle the final payment until inspection passes).
Under ordinary maintenance not requiring permit in the Nj renovation code.
v. The installation and replacement of any window or door, including garage doors, in the same opening
without altering the dimensions or framing of the original opening. This shall include storm windows and
storm doors. The installation and replacement of means of egress and emergency escape windows and
doors may be made in the same opening without altering the dimensions or framing of the original opening,
and shall not reduce the required height, width or net clear opening of the previous window or door assembly;
Why would it require a permit to replace the windows? I wouldn't say it's a structural change, so I'd guess no need for a permit..
If you want quotes from window contractors, you should really visit Contractor Quotes.
Even if you are replacing the FRAME without changing any of the actual dimensions? I.e., ripping out an old and deteriorating frame and putting in a new one with new window? No permit needed, correct?
You need the permit, and likely the mayor of either town to come visually inspect the entire installation 
evandepol said:
As a rule of thumb, permits are almost always required. I would call the township for the specifics in this case, but permits do give you some leverage over a contractor if they do a sub-standard job (you're not officially supposed to settle the final payment until inspection passes).
This. Call and ask.
Good advice, thanks.
mjh said:
evandepol said:This. Call and ask.
As a rule of thumb, permits are almost always required. I would call the township for the specifics in this case, but permits do give you some leverage over a contractor if they do a sub-standard job (you're not officially supposed to settle the final payment until inspection passes).
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I will call the town tomorrow to confirm but wondering if anyone knows the answer...... do you need to pull permits to replace windows in South Orange - single family home? Thanks!