Bathroom exhaust fan installation in Essex, Morris and Union County, NJ

Thumbtack's national average is $183 to $444, with jobs running from about $100 to $866 (updated June 5, 2026). Home Depot's Pro Referral page says labor for a simple replacement may cost $100 or less, while new ductwork and wiring could cost $500 or more, and a basic bath fan starts around $80. Panasonic puts professional labor at $200 to $500. These are national market ranges, not MDL prices.

In New Jersey, electrical work may only be done by a licensed electrician, or by a single-family homeowner on his or her own home (N.J.A.C. 5:23-2.15). Panasonic says to bring in a licensed electrician when the house wires lack a ground, the panel needs a new circuit, or you add a heater or light that increases the load. MDL Electric holds a New Jersey electrical contractor license (34EI01606200).

A same-size swap on the existing wiring and duct is the job most how-to guides cover: Lowe's says it is easiest when you reuse the existing switch, wires and duct, and to call an electrician if you are not comfortable working with electricity. Thumbtack recommends a pro for a new install that cuts into the ceiling, runs a new duct outside or adds a circuit. In New Jersey a homeowner may do electrical work only on his or her own single-family home.

Yes. New Jersey's residential code, the 2024 International Residential Code adopted at N.J.A.C. 5:23-3.21, says bathroom exhaust air must go directly to the outdoors and must not discharge into an attic, crawl space or other area inside the building (Section M1505.2). Section M1501.1 adds that exhaust may not go into an attic, soffit, ridge vent or crawl space.

ENERGY STAR's installation guide says to use the duct size the fan maker specifies, take the most direct route with as few bends as possible, keep the first three feet from the fan straight, seal the joints with mastic or metal tape, insulate the duct, and end it at a roof or wall cap with a damper. Lowe's describes a 4-inch duct to a roof vent cap when there is an attic, or a wall-mounted fan through a sidewall when there is not.

Lowe's and Panasonic both use length times width times height times 0.13 to get the CFM. Lowe's example is 8.5 by 9.5 feet with an 8-foot ceiling, about 84, so a fan of 90 CFM or more. The New Jersey residential code's minimum for a bathroom is 50 CFM when the fan is switched on and off, or 20 CFM if it runs all the time (2024 IRC Table M1505.5). ENERGY STAR suggests buying a fan rated at least 70 CFM to be sure of 50 once it is installed.

Not if the bathroom has a big enough window. New Jersey's residential code (2024 IRC Section R325.2) says a bathroom needs windows with at least 3 square feet of glass, half of it openable, unless it has artificial light and a local exhaust fan, and that exhaust must go directly outdoors. ENERGY STAR's guide adds that operable windows should not be relied on for consistent bathroom ventilation. Ask your town's construction office about an existing bathroom.

Not to replace one that vents on its own to the outdoors: N.J.A.C. 5:23-2.7(c)5.ix lists that as ordinary maintenance, which needs no permit or notice to the town (N.J.A.C. 5:23-2.14(b)1). A new fan, a new duct or a fan that does not vent outside on its own is not on that list, so it needs a permit under N.J.A.C. 5:23-2.14(a). Your town's construction office decides whether a job counts as minor work under N.J.A.C. 5:23-2.17A.

Some can. Broan's installation guide for its 688ESL fan says it is acceptable for use over a bathtub or shower when installed in a GFCI-protected branch circuit, at least five feet above the floor, that the switch must never be placed where it can be reached from the tub or shower, and that the unit must be grounded. Check the instructions for the exact fan you buy.

About an hour. ENERGY STAR's installation guide recommends leaving the fan running for one hour after a shower and using a timer switch instead of a standard wall switch, so the fan shuts itself off. Panasonic also sells fans with a humidity sensor that turn themselves on when moisture rises.

Home Depot's Pro Referral page says replacing a fan with proper wiring and ductwork can take less than an hour, wiring and duct upgrades may take a few hours, and a completely new installation may take an entire day or longer.

Panasonic lists the signs: a mirror that stays fogged for more than a minute, a rattling or loud fan, and peeling paint, mildew spots or musty smells. To test it, hold a tissue near the grille with the fan on; Panasonic says it should be pulled firmly against the grille, and moist air should come out of the outside vent within seconds.

As a guideline, every 5 to 10 years: InterNACHI's Standard Estimated Life Expectancy Chart lists a ceiling vent fan at 5 to 10 years. InterNACHI says its figures assume normal wear and should be used as guidelines only. The signs above (a mirror that stays fogged, a loud fan, peeling paint) tell you sooner whether yours is failing.

Call 973.809.2339 or send the form on this page with your town, whether there is a fan now and where it vents, whether there is an attic above the bathroom, and whether you want a light, heater or humidity sensor. MDL will tell you whether it handles that job. MDL Electric is a licensed New Jersey electrical contractor at 4 Harrison Avenue in West Orange.