If you have been searching for how much a whole house generator costs, you have probably seen a wide range of numbers and wondered why they vary so much.
Here is the honest answer: a whole house generator is a custom installation, not a product with a shelf price. What you pay depends on your home, your electrical panel, your gas supply, your property layout, your city’s permit requirements and the equipment you choose. Two neighbors on the same street can buy the same brand of generator and pay meaningfully different amounts.
This guide breaks down every factor that sets the number, so you know what to ask and what to expect when an installer visits your home. If you want the detail on what the installation labor itself involves, that is covered separately in what goes into generator installation cost.
What is a whole house generator, and how is it different from a portable one?
A whole house generator, also called a whole home or standby generator, is permanently installed outside your home and starts automatically within seconds of an outage. It runs on natural gas or propane, it powers your home through a transfer switch rather than extension cords, and it is the only form of emergency power that works while nobody is home.
A portable generator is a different product. It is cheaper to buy, it runs on gasoline you have to fetch and store, it needs to be set up and refueled by hand, it cannot carry central air conditioning, and it produces carbon monoxide that has killed people who ran one too close to the house. If you are weighing the two, we compare them properly in standby vs. portable generators.
Everything below is about whole house standby generators.
How much does a whole house generator cost in DFW?
It is quoted per home, and any installer who gives you a firm number before seeing your property is guessing. That is not a dodge. It is the single most useful thing to understand before you start collecting quotes, because it tells you how to read the ones you get.
Six things set your number, and they interact with each other:
- The size of the generator, measured in kilowatts, and what you want it to carry
- The equipment you choose, which is a decision about warranty and service as much as price
- Your fuel source, natural gas or propane, and whether your gas line can feed it
- Your electrical panel and transfer switch, including any panel work your home needs first
- Site conditions, meaning placement, the concrete pad, how far the conduit has to run and whether it has to be trenched
- Permits and inspections, which vary by city and by HOA across North Texas
The rest of this guide takes them one at a time.
How much does generator size affect the price?
Size is the biggest single variable. The kilowatt rating decides how much of your home the generator can run at the same time, and it is set by a load calculation rather than by square footage alone.
- Square footage and number of stories
- Whether you want central air conditioning running, which is the largest single load in most DFW homes
- How many HVAC zones you have
- Other heavy loads: EV chargers, pool equipment, whole-home water heaters
- The main breaker size on your electrical panel
A home with one 3-ton HVAC unit and a 200-amp panel is a different job from a 5,000 square foot house with two zones, a pool pump and EV charging. Getting the size wrong costs you either way: too small and the generator sheds loads during an outage, too large and you have paid for capacity you will never draw. HomeSafe runs the load calculation on every site visit at no charge.
Which is the best whole house generator for a DFW home?
The best whole house generator is the one correctly sized to your load and matched to the fuel you actually have. Brand comes second, and anyone who names a model before running your numbers is selling from stock rather than specifying for your home.
That said, the three brands HomeSafe installs are genuinely different from one another:
Generac has the widest range of kilowatt options in residential standby power, which makes it the easiest brand to size precisely. HomeSafe holds Generac’s PowerPro Premier dealer tier, so parts and factory support come direct.
Kohler is built to tighter tolerances and runs quieter, which matters on a tight suburban lot or an HOA property where the unit sits near a neighbor’s window. Warranty coverage is longer on several models.
Champion is strongest in the 12kW to 22kW band, which covers a large share of DFW homes. If your load calculation lands in that window it is a serious option rather than a budget compromise.
We put the three side by side in Generac vs. Kohler vs. Champion, and we will walk you through the choice on the site visit rather than deciding it for you.
Does natural gas or propane change the cost?
Both, and in different directions. Natural gas is usually the lower-cost option over the life of the unit because you draw from the utility line you already pay for. If your home has a gas meter and the pressure is adequate, the connection is comparatively simple.
Propane is the answer where natural gas service does not reach, which includes parts of rural Denton, Parker and Johnson counties. A propane installation needs a tank sized to the generator’s consumption rate, plus refills for the life of the unit.
The item that surprises people is gas line sizing. If your existing line cannot feed the generator and the rest of your appliances at peak demand, it has to be upsized. This is one of the most common reasons a project grows beyond what a homeowner expected, and it is exactly the kind of thing a site visit catches before you sign rather than after work starts.
Will I need a transfer switch or electrical panel work?
A transfer switch, yes, always. It disconnects your home from the utility grid before the generator takes over, which stops electricity back-feeding onto the lines outside. That is both dangerous and illegal, and it is why a whole house generator is not a DIY installation.
There are two common arrangements. An automatic transfer switch sits between your meter and your main panel, watches for an outage and signals the generator to start. A load management system instead prioritizes critical circuits, which lets a smaller generator cover the loads that matter most.
Panel work is the variable. If your home has a 60-amp or 100-amp panel, or a Federal Pacific or Zinsco panel, both common in DFW homes built before 1990, some panel work is likely part of the scope. It is identified during the site visit and quoted as its own line rather than folded into a single number you cannot break down.
What site conditions add to the cost?
The physical shape of your property drives labor and materials more than most homeowners expect.
- Placement. Units have to sit a set distance from windows, doors and property lines under local code. On tighter lots in Colleyville, Southlake, Highland Park and University Park, a compliant location can mean routing gas and conduit the long way around.
- The concrete pad. The generator is mounted on one. If you do not have one, it is poured as part of the job.
- Conduit run length. The distance from your panel to the unit is wire and conduit you have to pay for. A generator on the far side of a large lot costs more to connect than one beside the utility room.
- Trenching. Where conduit has to go underground, that is added labor.
All four are visible on a walk of the property, and together they are the main reason national cost ranges are so wide that they tell you almost nothing about your own home.
Do permits add to the price?
Yes, and they should. A generator installation in North Texas requires permits from your municipality, and Tarrant, Denton and Collin counties each run their own building and electrical permit processes. An HOA approval may be needed on top. We keep a city-by-city breakdown in generator permits in DFW by city.
HomeSafe pulls the permits and books the inspections for you, and permit fees are passed through at cost with no markup.
This is worth knowing because skipping permits is one way an installer comes in cheaper than everyone else. It also leaves you exposed on an insurance claim, voids manufacturer warranty coverage and turns into a problem at closing when you sell the house.
What does it cost to keep a whole house generator running?
Ownership cost is the part homeowners research last and should research first, because it is the difference between a generator that works in year eight and one that does not.
Three things make it up. Annual professional service is the interval all three manufacturers recommend, every 12 months or 200 hours of runtime, whichever comes first, and skipping it can void warranty coverage. Fuel is only consumed while the unit runs, so in a normal North Texas year that is a small number and in a February 2021 year it is not. Optional remote monitoring tells you the unit has a fault before the next outage does.
A weekly self-test is not service. It confirms the engine starts and tells you nothing about the transfer switch, the battery or whether the unit will hold load. What a real visit covers is set out in what is included in generator maintenance, and generator service and repair covers what we do and what it costs for your specific unit.
Why will no installer quote a price over the phone?
Because every factor above interacts with the others. A 22kW unit on natural gas with a healthy panel and a short conduit run in a Flower Mound new build is a different project from a 38kW unit on propane with panel work and 80 feet of trenched conduit on a Westlake estate. The equipment is the part a price list could cover. Everything else is your house.
This is why reputable installers in DFW do not publish fixed prices, and why a firm number offered before anyone has seen your property should make you more cautious, not less. Either it will change later or the scope has been trimmed to fit it.
What happens on a HomeSafe site visit?
Before we quote anything:
- Load calculation. We walk the home and work out your actual requirement circuit by circuit.
- Fuel assessment. We check gas pressure, capacity and meter size, or go through propane options.
- Panel inspection. We note the age, brand and capacity of your electrical panel.
- Placement assessment. We find the best code-compliant location for the unit.
- Permit research. We confirm what your specific city and HOA require.
- Written quote. You get an itemized proposal covering equipment, installation, permit fees and anything else we found.
The site visit is free, there is no obligation, and we will not push you toward equipment your load calculation does not call for.
Where does HomeSafe install whole house generators?
Across Tarrant, Denton, Collin and Dallas counties, including Fort Worth, Southlake, Colleyville, Flower Mound, Keller, Trophy Club, Grapevine, Frisco, Plano, Prosper, Highland Park, University Park and the surrounding North Texas communities.
As a Generac PowerPro Premier dealer we carry the full residential range and stock most parts locally, which is what decides whether a repair happens this week or next month. We hold TDLR Electrical Contractor License #41809 and carry 190+ five-star reviews from homeowners across the metroplex.
Get a quote built around your home, not a national average
Stop trying to reverse-engineer your project from ranges you found online. A 30-minute site visit gives you an itemized number specific to your home, your panel, your gas supply and your city.
Questions first? Call (817) 439-9009 and ask them.