You could just call zoning and ask them, no?

you have to read the zoning code (link from city website) - a rear carriage house is an accessory structure so look at those requirements for height, setbacks, etc.

Rooftop additions remain subject to the permitted building height. The only exceptions are stair/elevator bulkheads, mechanicals, etc. which are regulated in the zoning code under "height exceptions".

whilst reading the nyt real estate section, i happened upon a question from a reader asking about the feasibility/legality of building a cabana in the backyard of his/her coop. the nyt was not very encouraging.

what are the rules of the road in jersey city regarding building cabanas and/or carriage houses in the rear yard. what about rooftop additions and sunrooms?

This is very helpful. I came across a similar language deep somewhere on the internet with Muni Code, etc. I appreciate you posting the reply.

I know a few people who installed them, and no permits were taken out. Just a friendly chat with immediate neighbors and it was all good.

Here's the New Jersey Administrative code:

http://www.state.nj.us/dca/divisions/ ... /pdf_regs/njac_5_23_2.pdf

Specifically addressing your question, it says the following:

TITLE 5. COMMUNITY AFFAIRS
CHAPTER 23. UNIFORM CONSTRUCTION CODE
SUBCHAPTER 2. ADMINISTRATION AND ENFORCEMENT; PROCESS
N.J.A.C. 5:23-2 (2014)
This document is provided as a courtesy only; the official Administrative Rules
of the State of NJ are available through LexisNexis, the publisher licensed by
the NJ Office of Administrative Law, or through your local public library.
Page 12 of 57
iii. It is not greater than 25 square feet in surface area (one side); and
iv. It is not more than six feet above the ground (mounted height).
7. Lead abatement work performed on a steel structure or other superstructure or in a commercial building.
8. A construction permit for building work shall not be required for garden-type utility sheds and similar
structures that are 100 square feet or less in area, 10 feet or less in height, and accessory to buildings of
Group R-2, R-3, R-4, or R-5 and which do not contain a water, gas, oil or sewer connection. A construction
permit for electrical work shall be required, when applicable.

OR does anyone have any experience building a shed in their backyard?

I am simply trying to figure out if 1.) it is allowed 2.) if allowed, what are the restrictions/requirements.

Does anyone have any info/experience with zoning/permits for a shed in the backyard of a brownstone in Downtown?