How Far Should a Generator Be From the House?

Keep a portable generator at least 20 feet from the home and position its exhaust away from the building. Measure from the generator itself, not from the end of its exhaust.

Set the unit outdoors in an open area where exhaust can disperse. A roof or walls can limit airflow, so a spot that is partly sheltered may not be suitable even if one side is open.

Wind direction can change while the generator runs. Don't rely on the wind to keep exhaust moving away from the house, and don't use a closer spot just because the wind is favorable at startup.

If the only available location is close to the home or under a cover, don't run the generator there. Move it to a safe open space or wait until you can follow the placement guidance.

Why must a generator stay outside?

A generator produces carbon monoxide, an odorless gas that can cause illness or death. Outdoor placement away from the home helps keep exhaust from entering living spaces.

Never operate one inside a home, basement, garage, shed, or other enclosed space. Avoid porches, carports, and breezeways where a roof or walls could trap exhaust.

CPSC recommends working CO alarms on every level of the home and outside sleeping areas. Test alarms according to their instructions and replace them when required.

Which doors, windows, and vents should you avoid?

Keep the generator away from every opening that could let exhaust indoors, including exterior doors, windows, fresh-air intakes, and dryer or bathroom vents. Closed windows don't replace distance from the home.

Walk around the whole building before choosing a spot. Check for openings on every side, including vents you might not notice from the area where you plan to run a cord.

Keep nearby doors and windows closed while the generator is running, but don't count on that to make a close location safe. Exhaust can still be carried toward the house by changing wind.

How far should a generator be from a closed window?

Keep the generator at least 20 feet from the home even when a nearby window is closed. It could be opened during an outage, and a closed window doesn't prevent exhaust from entering through other openings.

Check the location for windows and vents on all sides, not just the wall nearest the cord or appliance. If you can't keep the recommended distance, choose another spot.

Can you run a generator under a porch or carport?

No. A roof or walls can limit how exhaust disperses, even when the area looks open from one side.

Use an open outdoor location away from the house. If rain or other weather is a concern, follow the generator manual's outdoor-use directions and use only a setup the manufacturer permits.

How do you choose a safe outdoor location?

Choose a level, open outdoor area at least 20 feet from the home, with exhaust pointed away from doors, windows, and vents. Check the manual for model-specific clearance, weather, and operating directions.

Plan the location before an outage. Walk the route for the generator and cord, then check that the setup won't block an exit, cross a busy path, or sit in standing water.

Think about people and pets moving around the area. Keep the generator away from play spaces and places where someone might brush against a hot surface.

Don't put the generator where neighbors or people entering and leaving the house will be exposed to its exhaust. If the planned spot can't meet the distance and open-air guidance, it isn't the right location.

Does a carbon monoxide shutoff change the distance?

No. A CO detection or shutdown feature doesn't replace outdoor placement at least 20 feet from the home.

Follow the manual, even when the generator has a sensor.

Different brands use different names and functions for these features. Champion describes CO Shield as a carbon monoxide auto shutoff system, while Generac says COsense monitors CO and shuts the unit down if dangerous levels are detected near it.

Choose a generator based on your power needs and its safety instructions, not on a sensor as permission to place it closer. Our guide to portable generators for home use explains how to compare home backup options.

How should you plan cords and a home connection?

Use an outdoor-rated extension cord that fits the generator and appliance, and keep the route clear of doors and walkways. A suitable cord can help you place the generator farther from the house.

Never connect a generator to a home outlet with a male-to-male cord or try to feed power through household wiring. For cord selection, see what extension cord you need for a generator.

For household circuits, ask a licensed electrician about a transfer switch or another approved connection. The portable versus standby generator guide compares those broad setup choices.

How do you choose a generator for the space you have?

Choose a generator whose power and fuel options suit your needs, then make sure you have an outdoor location that meets the distance guidance. A small inverter can be easier to move, while a larger home backup unit needs more room and a suitable connection plan.

The Champion 4500-watt inverter is a fit for buyers who want gasoline or propane, electric start, and up to 3500 running watts on gasoline. Skip it if you need more running power than it provides or cannot accommodate its weight of 99.2 pounds.

The Generac GP3300i suits buyers who prioritize a lighter 59.5-pound inverter for essentials, camping, or RV use. Its 2500 running watts and gasoline-only fuel make it a poor fit for larger loads or someone who wants propane flexibility.

The WEN DF8000X is for households comparing higher output, dual-fuel operation, and a 120V/240V outlet for a transfer-switch connection. Its larger size makes it a poor choice if storage, transport, or a safe operating location is limited.

The Westinghouse WGen7500DFc offers gasoline or propane, electric start with a remote key fob, and 7500 rated watts on gasoline. At 202.1 pounds, it's best for a planned home backup setup with room to position it safely, rather than frequent solo transport.

What setup mistakes should you avoid?

The most common placement mistake is choosing a convenient spot near a door, window, or garage. Check the entire perimeter of the home and move the unit at least 20 feet away before starting it.

Don't run a generator under a cover, inside an attached garage, or near an opening because rain or cord reach makes that spot convenient. Don't treat a CO sensor or a closed window as a substitute for outdoor placement.

Don't route a cord through a doorway where it can be pinched or create a trip hazard. Choose a cord and route that let the generator remain in its safe outdoor position.

What does the generator manual say about placement?

The manual is the best source for model-specific placement and operation details. Read it before the first start, and follow any distance or ventilation direction that is more restrictive than general guidance.

Keep the manual where you can find it during an outage. Review startup, shutdown, refueling, and weather instructions before you need backup power.

If you haven't selected a generator yet, how to choose a generator explains how to compare wattage, fuel, and features. For outage planning, start with the home outage guide.

Which generator setup should you choose?

Pick a smaller inverter if your essential loads are modest and you can place it outdoors at least 20 feet from the home. Choose a higher-output model if your load plan needs more watts and you have room for a safe location and a proper connection.

For occasional essentials with easier carrying, consider the Generac GP3300i. For more output and a choice of gasoline or propane, compare the Champion or WEN; for a larger planned home backup setup with remote start, consider the Westinghouse.

Whatever model you choose, how far a generator should be from the house remains the same: at least 20 feet outdoors, with exhaust directed away from openings. If your property doesn't provide that safe space, don't run the generator there.

Frequently asked questions

How far should a generator be from a house?

Place a portable generator outdoors at least 20 feet from the home, with exhaust directed away from doors, windows, and vents. Follow the generator manual and CPSC guidance, and keep it away from attached garages and other enclosed or partly enclosed spaces.

Can I run a generator under a porch or carport?

No. A porch, carport, garage, or other covered or partly enclosed area can trap carbon monoxide.

Run the generator outdoors in an open area, at least 20 feet from the home, and aim exhaust away from openings.

Should a generator be near a window if the window is closed?

No. Keep the generator at least 20 feet from the home and away from windows, doors, and vents, whether they are open or closed.

Carbon monoxide can enter through openings, and wind can carry exhaust toward the house.

Does a generator's carbon monoxide sensor make close placement safe?

No. A carbon monoxide sensor or shutdown feature does not replace safe outdoor placement.

Keep the generator at least 20 feet from the home, direct exhaust away from openings, and follow the manual's instructions.

How Far Should a Generator Be From the House?