Bathroom exhaust fan installation cost calculator

Pick a new fan or a replacement, add upgrades, and enter your ZIP. Prices combine Fixr and HomeAdvisor, with every step shown.

$400Typical new fan, installed

$250Average replacement (Fixr)

$20 to $500Fan alone (HomeAdvisor)

Bathroom exhaust fan installation cost

$250 to $730

Typical $400 (US average)

$250Low

$730High

Vent the fan outside, never into the attic. Moist attic air causes mold.

Free. Your numbers become an estimate you can send from your phone.

How we got this

New fan where there was none$250 to $730 (typical $400)Fixr $250 to $900 (average $400) and HomeAdvisor $241 to $563 (average $396). Middle of the two.
RegionUS average prices (no ZIP entered)Enter a ZIP to scale the labor part of the price to your state's wages.
Total$250 to $730, typical $400

Item	Qty	Low	Typical	High
Bathroom exhaust fan: new fan where there was none	1	$250	$400	$730
Total		$250	$400	$730

Sources: Fixr, bathroom fan installation cost; HomeAdvisor, bathroom fan installation cost; BLS Occupational Employment and Wage Statistics, May 2025 (state and national files); US Census Bureau, 2020 ZIP Code Tabulation Area to county relationship file. Checked 2026-10-09.

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Key takeaways

A new bathroom fan usually costs $250 to $730 installed, about $400 typical, from Fixr and HomeAdvisor.
Replacing an existing fan averages $250, Fixr says, because the duct and wiring are there.
Heaters, lights and humidity sensors add to the fan price.
Always vent the fan outside, not into the attic.

What a bathroom fan costs

Fixr puts a new fan at $250 to $900 installed, $400 average; HomeAdvisor says $241 to $563, $396 average. The calculator uses the middle. Fixr says the average drops to $250 when you replace an existing fan, and the calculator scales the range by that ratio.

Fan size

Fan size (CFM)	Fan (HomeAdvisor)
40 to 79	$20 to $250
80 to 99	$50 to $325
100 to 149	$55 to $400
150 and up	$100 to $500+

Bigger bathrooms need more CFM. Fixr lists full-bath fans of 75 to 150 CFM at $75 to $200.

Lights, heaters and sensors

Fixr lists a basic fan at $50 to $75, a fan with light at $50 to $100, with heater at $100 to $300 and with a humidity sensor at $75 to $125. The calculator adds the difference over a basic fan for each upgrade.

A worked example

A new fan at the US average comes to $250 to $730, about $400 typical. Replacing an old fan with a humidity-sensing one is about $288. Enter a ZIP to scale the 60% labor share.

Quoting fan jobs

Duct run. Through the roof or a wall, and how far.
Switch or timer. A new switch line adds time.
Attic access. No access means cutting ceiling.

Send it as an estimate from Koira.

Last checked October 9, 2026. More for your trade: how electricians run on Koira.

FAQ

How much does it cost to install a bathroom fan?

Fixr says $250 to $900, $400 average. HomeAdvisor says $241 to $563.

How much does it cost to replace a bathroom fan?

Fixr says about $250 when an existing fan is replaced.

What size bathroom fan do I need?

Size it in CFM to the room. Bigger bathrooms need bigger fans.

Can a bathroom fan vent into the attic?

No. Vent it outside so moisture does not cause mold in the attic.

Are humidity-sensing fans worth it?

They run only when needed. Fixr lists them at $75 to $125 for the fan.

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