A standby generator is one of the few home improvements a buyer can see working. It is also one of the few where the seller can lose the value entirely — by having no paperwork, no service record, and no way for a buyer’s inspector to confirm what is actually installed. This page covers what the research says a generator is worth at sale, what a buyer (and their inspector and insurer) will ask for, and the small pile of documents that turns an installed generator from a talking point into a line item.
What the research says it is worth
The figure most often quoted is from the 2025 Remodeling Cost vs. Value Report: a generator project recoups about 95.3% of its cost at resale, nationally. That is a strong figure — and it is also a figure that needs its framing kept honest. It is a national survey estimate, not a Palm Beach County sale price. It is an average across projects of very different sizes, in very different markets. It does not mean your $15,000 generator adds $14,295 to your sale price. It means that, on average, in the survey’s sample, buyers valued the project at close to what it cost — which is more than can be said for most improvements, and which is a useful thing to know when you are deciding whether to install one before you sell.
What the figure does not tell you is the Palm Beach County part: whether buyers here pay more for a house with a generator than for the identical house without one. The honest answer is that the county-level data does not exist in published form — no local study isolates the generator premium in Palm Beach County sales. What exists is the national estimate, the local cost of installing one ($11,000–$17,000, installed and permitted), and the judgement of local agents: in a market where a hurricane season is a fact of life, a working standby generator is a feature buyers ask about, and a house that has one is a house that stands out in a showing.
That is the honest framing. A generator is worth installing before a sale because it makes the house sellable, not because a formula says it adds 95.3% of its cost. The value is in the buyer who chooses your house over the one down the street — and in the buyer who does not walk away when the inspector finds a generator with no paperwork.
Figures last reviewed November 2026 · Sources: 2025 Remodeling Cost vs. Value Report (national survey estimates); Palm Beach County installed-cost research — see “How we get our numbers” on the About page.
If you are selling, or thinking about it, start with what the house already has.
What a buyer will ask — and what the inspector will check
A buyer does not buy a generator. They buy a house that has a generator, and they will want to know four things:
- Is it permitted? The buyer’s inspector, and their insurer, will ask whether the installation was permitted and inspected. An unpermitted generator is a liability, not an asset — it can hold up a sale, raise insurance questions, and cost the buyer the price of bringing it up to code.
- Does it work? The inspector will run it. A generator that has not exercised in months, that has a dead battery, or that faults on start-up is a generator that costs you negotiating power.
- How old is it, and has it been serviced? A service record — dates, oil changes, battery replacements — is the difference between “a generator” and “a maintained generator.” The first is a question mark. The second is a feature.
- What does it power? A whole-home unit that powers the air conditioning is a different asset from a partial unit that powers a few circuits. The buyer will want to know which, and the transfer switch and panel labelling should say so.
None of these is hard to answer — if you have the documents. All of them are hard to answer if you do not.
The paperwork that makes it worth something
Keep these five things together, in a folder, with the house:
- The permit and the final inspection sign-off. The document that says the installation was inspected and approved.
- The installer’s invoice, showing the model, the size in kW, and the date of installation.
- The service record. Every visit, every oil change, every battery replacement, with dates. If you are on a service plan, the plan’s records count.
- The transfer switch and panel labelling. A photograph of the panel with its labels legible, and the transfer switch model.
- The monitoring app, set up and working, with the login handed over at closing. A buyer who can open the app on the day they move in is a buyer who believes the generator works.
If you are buying a house with a generator and the seller cannot produce these, that is not a reason to walk away. It is a reason to have a generator technician inspect the unit before closing — and to negotiate the price of that inspection, and any work it finds, into the deal.
Should you install one before you sell?
The short answer is: it depends on the house, the market, and the timing. A generator installed a year before a sale, with a year of service records and a permit, is an asset. A generator installed a month before a sale, with no service history and an installer who has already left town, is a question mark. If you are selling soon, the better investment is usually the paperwork: get the unit serviced, get the documents in order, and make sure the monitoring app works. If you are selling in a year or two, an installation — properly permitted, properly serviced — is a genuine improvement to the house, and one that buyers in Palm Beach County understand without explanation.
And if you are not selling — if the house is yours for the next decade — the calculation is different again. The generator is not an investment in resale. It is an investment in the house staying dry, cool, and powered while you are not there. Which is the subject of the first page in this series.
Related: What a power outage does to an empty house · What a generator costs in Palm Beach County · Maintenance & service plans
Do the research first.
The free Palm Beach County Generator Cost Guide puts the county numbers — the $11,000–$17,000 range, the permit fees, the fuel maths — in one PDF. We email it to you; we do not call you about it unless you ask us to.
Palm Beach Backup Power is an information and matching service — we do not install generators. We do not take a fee from you. Our installer partner pays us when a consultation they receive through us becomes an installed generator. The price you pay is the installer’s price either way.