A furnace swap, a duct repair, and a run of new ductwork for a finished basement sound like similar jobs on paper, but New Jersey's Uniform Construction Code sorts them into three different permit categories. Maple Shade's housing inspection checklist states one of those categories plainly: a permit is required for any new heater, air conditioner or water heater, even when the replacement matches the old unit's capacity. Burlington County homeowners run into this question on basement finishing jobs, furnace swaps and duct extensions alike. The distinction is not cosmetic. It decides whether a homeowner can schedule the crew for next week or has to wait on a permit before the walls close back up.
Work the state counts as ordinary maintenance
New Jersey's Uniform Construction Code lists several residential jobs as ordinary maintenance, work that does not call for a permit or advance notice to the local construction office. Duct work repair and replacement falls on that list, along with a replacement dryer installed with no change in fuel type or location, a replacement bathroom exhaust fan that vents to the outdoors, and a liquid lining applied inside an existing chimney flue. Air Duct Repair that replaces a crushed or disconnected run, or Air Duct Installation that swaps old flex duct for new in the same configuration, both sit inside that ordinary maintenance category as long as the layout and location stay the same. A technician doing that kind of work in Cherry Hill or Maple Shade does not pull a permit for it, because the code does not call for one. The liquid lining example matters for anyone in an older section of Cherry Hill or Maple Shade with a masonry chimney serving a furnace flue, since that work updates the inside of the flue without opening the brick itself, which is why the code treats it the same as a duct repair rather than new construction.
This category covers most duct cleaning and small repair calls. A homeowner with a crushed supply run in a crawl space or a disconnected boot behind a wall is not looking at a permit step, since the repair does not change what the duct system does or where it runs. The same holds for a straightforward duct replacement project that swaps old ductwork for new inside the same chases, as long as the system is not being resized, relocated, or extended to cover new square footage.
Minor work: furnace, boiler and air conditioner swaps
Replacing a furnace, boiler or air conditioner with a unit of like capacity, installed in the same spot, falls under the state's minor work category. Minor work still calls for a permit, but the rule gives homeowners and contractors a head start on scheduling: the work can begin once the local construction office has notice of the job, and the permit application follows within five business days of that notice. Maple Shade's housing inspection checklist reflects the permit side of this directly, listing any new heater, air conditioner or water heater as requiring a permit, without an exception for a straight swap. That matches the state's minor work rule. Notice in this context usually means a short written statement to the construction office identifying the address, the equipment being replaced, and the contractor doing the work, not a full permit application with drawings. The notice-first approach means a contractor does not have to wait for the permit to be issued before starting the replacement, as long as the paperwork catches up within the window the code allows.
New ductwork for an addition or a resized system
Ductwork that did not exist before, extended to serve a new addition, a finished basement, or a room that previously had no supply or return, is not ordinary maintenance and does not qualify as minor work. It goes through the standard permit process the same as other new mechanical installation, because the job changes what the duct system covers rather than repairing or replacing what was already there. Air Duct Installation for a new zone or an addition in Burlington County towns typically means a permit application, a description of the new runs, and an inspection before the work closes up inside walls or a finished ceiling. Resizing an existing system to handle a larger furnace or a changed duct layout falls into this same category, since the change goes beyond a like-for-like swap. A basement build-out that adds new supply runs and a return for a home office falls squarely in this category, even in a home where the furnace itself is not changing.
How Air Duct Installation and Air Duct Repair fit the permit picture
A job that mixes categories, a furnace replacement paired with new ductwork for a finished basement, for example, often gets split for permit purposes. The furnace swap moves ahead as minor work with notice, while the new duct runs go through the standard permit review before the walls or ceiling close around them. Dryer Vent Installation gets its own version of this split: a straight swap with no change in fuel type or location sits on the ordinary maintenance list, but a new run through a different wall or a relocated termination point counts as new work with its own permit review. A written estimate for a project like this should spell out which pieces call for a permit and which do not, so a homeowner is not left guessing once the crew arrives.
The local construction office has the last word
None of these categories apply themselves. The state code sets the framework, but Maple Shade's construction office, like any other municipal office in Camden County and Burlington County, applies it to the specific job in front of them, and a local checklist such as Maple Shade's can spell out documentation or inspection steps beyond the bare minimum the state code describes. A homeowner planning a furnace replacement, a duct extension, or any mechanical work tied to an addition should call the township construction office before scheduling the work, confirm which category the job falls into, and find out what notice or application the office wants to see. That call might also flag a dryer vent termination that calls for its own inspection, or a duct extension that crosses into a fire-rated wall assembly requiring extra documentation. A contractor familiar with the area can point out which category a job is likely to land in, but the construction office makes the final call before a wall or ceiling closes around the work.