Skip to content 
You don’t need to install a standby generator while building a new house to prepare your home for one. If you think you may want backup power in the future, generator pre-wiring can make that future installation easier.
New construction is often the easiest time to plan for a generator because walls, ceilings, and other areas are still accessible. Your electrician can plan wiring pathways, electrical equipment locations, and future backup loads before the house is finished, potentially reducing the disruption involved in adding the system later.
What Does “Pre-Wiring for a Generator” Mean
“Generator-ready” can mean different things depending on the home and the future generator.
Pre-wiring a house for a generator may involve installing a conduit or wiring pathways between the electrical equipment and future generator location, allowing space for a transfer switch or other approved transfer equipment, and planning the electrical panel around the circuits you may want to back up. Your electrician can also coordinate the generator location and any necessary exterior penetrations while the home is being built.
The exact preparation depends on the generator system you eventually choose.
Why Plan for a Generator During New Construction?
Plan for Easier Installation Later
One of the biggest advantages of generator wiring for new construction is access.
Before drywall, ceilings, and finished surfaces are installed, electricians can install wiring through areas that may be difficult to reach later. Exterior penetrations can also be coordinated as part of the construction process.
Once the house is finished, adding the same infrastructure may require some more disruptive work or less convenient wiring routes. Pre-wiring doesn’t guarantee that a future installation will be cheaper, but it can reduce some of the challenges involved in retrofitting a completed home.
Plan the Generator Location Early
The future generator location should be considered before construction is complete. Your electrician and generator installer may need to account for required clearances, access for maintenance, exhaust and ventilation, fuel supply, and distance between the generator and electrical equipment.
Placement requirements vary by generator and applicable codes, so don’t assume that the generator can simply be placed wherever it is closest to the electrical panel.
What Should You Discuss With Your Electrician?
The earlier you bring up your plans, the more flexibility your electrician has during the rough-in stage.
Decide What You Want to Back Up
Decide whether you eventually want to back up the entire home or only selected circuits. Potential backup loads might include a refrigerator and freezer, heating and cooling equipment, a well pump, a sump pump, lighting, internet and networking equipment, and other essential appliances or circuits.
These loads can help determine the size and electrical requirements of the generator you eventually choose.
It’s also worth considering future electrical additions. An EV charger, hot tub, workshop, or other large electrical load could affect how much backup capacity you eventually need.
Consider the Electrical Panel
Your electrical panel is another important part of generator preparation for a new home. Your electrician can consider which circuits you may eventually want backed up and whether the planned panel configuration provides appropriate space and capacity for the future system.
Plan for Transfer Equipment
A standby generator installation typically includes approved transfer equipment to safely switch between utility and generator power. Depending on the system, this may be an automatic transfer switch or another approved configuration.
The transfer equipment helps prevent the generator from feeding power back into the utility system while allowing the home’s electrical loads to switch safely between power sources.
You don’t necessarily need to install the final transfer equipment during construction if you haven’t selected your generator yet. Your electrician can instead plan the space and wiring pathways around the future installation.
What if You Don’t Know Which Generator You Want Yet?
You can still prepare your home without choosing a generator today. Your electrician can identify a likely generator location, install the necessary electrical infrastructure, consider future backup circuits, and allow space for transfer equipment.
This approach gives you some of the advantages of a generator-ready home without necessarily committing to a generator you may not ultimately purchase.
Is Generator Pre-Wiring Worth It?
Pre-wiring a house for a generator is particularly worth considering if you already expect to want backup power in the future. It may make sense for rural or acreage homes, homes with private wells or sump pumps, homes in areas prone to power outages, and homeowners who already expect to install a generator.
It’s less compelling if you have no realistic plans to install a generator. In that case, spending money on infrastructure that may never be used may not provide enough value.
The potential savings from pre-wiring also aren’t guaranteed. They depend on what infrastructure is installed during construction and what the eventual generator installation requires.
Ask About Generator Pre-Wiring Before Rough-In
If you think you may want to install a generator someday, discuss it with your electrician before electrical rough-in.
At a minimum, ask:
- Where can you safely install a future generator?
- What do you want to power during an outage?
- What size generator might those loads require?
- Can the necessary wiring pathways be installed now?
- Where could future transfer equipment go?
Bringing up these questions while the house is still being built gives your electrician an opportunity to incorporate future plans into the electrical design rather than making those changes after the house is finished.
The Bottom Line
Generator pre-wiring can be a practical way to prepare a new home for future backup power.
You may not need to install the generator itself during construction. Instead, your electrician can plan the generator location, wiring pathways, panel configuration, backup loads, and space for future transfer equipment while the home is still accessible.
If you think you’ll eventually want a standby generator, bring it up before electrical rough-in. A little planning during construction can give you more flexibility and make the eventual installation less disruptive.
