Generators for New Construction vs. Retrofit: What's Different for Naples Homeowners | CoHarbor Electric

We got a call last year from a couple building out in Golden Gate Estates. Beautiful lot, plenty of room, house still framed out. They wanted a whole-home standby generator and figured they’d just call us once the place was finished, same as they would for any other upgrade. We had to explain — gently, because nobody likes hearing this mid-build — that if we’d been looped in three months earlier, during electrical rough-in, the whole install would’ve been simpler and probably a few hundred dollars cheaper. Instead we were routing conduit around finished stem walls and landscaping that had already gone in. Nothing we couldn’t handle. Just more work than it needed to be.

That conversation happens more than you’d think in Naples. Between the new builds pushing east toward Golden Gate Estates and Ave Maria, and the older established neighborhoods where houses have been standing for decades, we end up doing generator work on both ends of the spectrum pretty regularly. And the honest truth is, planning a generator into new construction and retrofitting one into an existing home are two different jobs. Not wildly different in the end result — you still get a generator that kicks on when FPL power drops — but different enough in process, cost, and headache level that it’s worth understanding before you’re standing in your half-built kitchen wondering why the electrician looks concerned.

Why New Construction Gives Us More to Work With

If you’re building new — whether that’s a custom home out in Quail Creek or a spec build closer to town — the biggest advantage is timing. We can size the generator circuit and plan the transfer switch location before drywall goes up, before the driveway is poured, before the landscaping crew shows up with a truck full of palms that’ll need to go somewhere.

That means:

• The generator pad location gets picked with actual thought, not squeezed into whatever side yard is left over
• Conduit runs from the panel to the pad location get laid in during rough-in, no trenching through finished sod later
• The main panel itself gets sized with generator load in mind from day one, instead of us discovering during a retrofit that there’s no room left in the panel for a transfer switch
• Fuel line planning (if you’re going propane, which a lot of new Naples builds do) happens alongside the rest of the site utilities instead of as an afterthought

None of that is complicated stuff. It’s just sequencing. And sequencing done right saves money — usually in the range of a few hundred to over a thousand dollars depending on how much digging and patching a retrofit would’ve required instead.

The One Thing Builders Sometimes Skip

We’ve walked onto new-construction sites where the general contractor assumed the electrician would “handle the generator stuff” without anyone actually specifying what that meant. If nobody puts generator-ready language in the electrical scope — conduit stub-out, panel capacity, pad location — it doesn’t happen automatically. It has to be asked for, in writing, before rough-in inspection. Worth bringing up directly with your builder if a generator is part of the plan, even if you’re not installing it until after closing.

Why Retrofits Are a Different Animal

Most of the calls we get, though, aren’t new construction. They’re homeowners in places like The Moorings or Aqualane Shores who’ve lived in the house for years and finally decided a generator’s worth the investment — usually right after a storm knocked the power out for four days and everyone remembers exactly how uncomfortable that was.

Retrofitting means working around what’s already there. That can mean:

• Trenching through an existing lawn or hardscape to run conduit from the panel to wherever the generator pad ends up
• Dealing with a panel that’s undersized or outdated for the additional load — which sometimes means a panel upgrade has to happen before the generator work even starts
• Finding pad placement that satisfies setback requirements and, if you’re in a deed-restricted community, HOA rules — without disturbing existing landscaping or hardscape you’d rather not tear up
• In older Naples homes near the water, checking whether the electrical service itself needs updating to handle a modern automatic transfer switch safely

None of this makes a retrofit a bad option — most of our generator installs are retrofits, and they go fine. It just means there’s more assessment work upfront, and the site visit matters more. We’ve seen jobs where what looked like a straightforward install turned into a panel replacement once we got into the electrical room and saw a decades-old panel that had no business carrying that much additional load.

The Permitting Side Doesn’t Change Much Either Way

Whether it’s new construction or retrofit, generator installations in Naples fall under NEC Article 702 for standby power systems, and both routes require a permit through Collier County before work starts and an inspection before the system gets energized. New construction sometimes folds the generator permit into the broader building permit already in process, which can actually simplify things. Retrofits require a standalone electrical permit specific to the generator install. Either way, it’s not something to skip — an uninspected generator hookup is one of the more common reasons we get called out to fix someone else’s backfeed problem, and backfeeding into the grid without a proper transfer switch is a real hazard to LCEC line workers, not just a paperwork issue.

What This Means for Sizing and Cost

We’re not going to pretend new construction and retrofit come out to the same number, because they usually don’t. New construction generator infrastructure, planned during rough-in, tends to land on the lower end of the cost range simply because there’s less physical work involved — no trenching through finished ground, no unexpected panel surprises. Retrofits vary more, since so much depends on panel condition, pad accessibility, and how far the run is from panel to pad. Generator installs overall tend to run somewhere between $1,800 and $4,500 depending on unit size, panel work needed, and site conditions — but that’s a range to plan around, not a quote, and the only way to know where your project lands is a walk-through.

Mistakes We See on Both Sides

On the new-construction side, the biggest mistake is treating the generator as a “later” decision and not mentioning it during electrical planning — which erases most of the cost advantage new construction should have offered in the first place.

On the retrofit side, the biggest mistake is homeowners assuming the generator install is purely a generator question, when half the time the real question is whether the existing panel can support it. We’ve had homeowners set on a specific generator size before we’ve even looked at their panel, and that’s backwards. The panel and the electrical service tell us what’s realistic before the generator brand or size gets decided.

Building or Retrofitting, We’ll Walk the Site With You

If you’re mid-build in Golden Gate Estates or Ave Maria and want generator infrastructure planned in before rough-in closes out, or you’re in an established Naples neighborhood and finally ready to stop losing power every storm season, the starting point is the same either way — a site visit. Coharbor Electric is a licensed and insured electrical contractor serving Naples and Collier County, and we’ll look at your timeline, your panel, and your property before recommending anything. New build or retrofit, we’d rather plan it right the first time than fix it the second time. Reach out and we’ll get a visit scheduled.