Oil-to-Gas Conversion in Connecticut: What It Costs and How It Works

If you still heat with oil, you have probably done the math in your head every time a delivery truck pulls up. Oil prices swing, the tank takes up half the basement, and the system is one cold morning away from a repair bill. So the question comes up: is it worth switching to natural gas?

For a lot of homes in Glastonbury, it is. But the honest answer depends on one thing more than any other, and we will get to that first.

The question that decides everything

Is there a natural gas main on your street?

If gas already runs down your road, a conversion is straightforward and the numbers usually work. If there is no main near you, the utility has to extend one, and that changes the project from a heating job into something much larger and more expensive. Sometimes it kills the idea entirely.

So before anything else, that is what we check. You can often find out yourself by calling the gas utility and giving them your address, or we will confirm it as part of an assessment. No point pricing out a conversion for a street that has no gas to connect to.

What it costs in Connecticut

Assuming gas is available, most full conversions in this area land between $5,000 and $12,000 installed. That is a wide range, so here is what moves you within it.

The equipment you choose. Swapping an oil boiler for a gas boiler, or an oil furnace for a gas furnace, is the core of the job. A standard-efficiency replacement sits at the lower end. A high-efficiency condensing unit costs more up front and earns it back in fuel savings.
Running the gas line. If the main is at the street, the line still has to come from there to your equipment. A short, simple run is cheap. A long run, or one that has to cross a finished space, adds labor.
Removing the old oil tank. This is the part people forget. Decommissioning and hauling out an old oil tank typically adds $1,000 to $3,000, more if the tank is underground or has leaked. You do not have to remove it the same week, but most people want it gone.
Venting and the chimney. Gas equipment vents differently than oil. Depending on your setup, you may need a new liner or direct venting through a sidewall.

A firm number only comes after someone looks at your basement. Anyone who quotes a conversion over the phone without seeing the equipment is guessing.

How the process goes

Once you decide to move forward, the job runs in a predictable order.

Confirm gas service and pull permits. We verify the main, arrange the utility connection, and file the permits the town requires.
Set the meter and run the line. The utility brings gas to the meter. We run the line from the meter to your equipment and pressure-test it.
Swap the equipment. Out comes the oil boiler or furnace, in goes the gas unit, sized to your house rather than to whatever was there before.
Handle the venting. New liner or sidewall vent, whatever your setup calls for.
Decommission the oil tank. Drain it, cut it down if needed, and haul it out.
Inspect and fire it up. The town inspects the work, we start the system, balance it, and walk you through the new controls.

Most conversions take a day or two of actual work once the utility has done its part. The utility timeline is usually the longest pole in the tent, so we start that early.

What you actually gain

People convert for a few honest reasons, and none of them are magic.

Steadier fuel costs. Gas pricing tends to be less volatile than oil, and you are billed for what you use instead of buying a tank at a time.
No more deliveries or run-outs. The gas is just there. No scheduling, no watching a gauge, no cold house because the truck was late.
A cleaner basement. The tank goes away, and gas burns cleaner than oil, so there is less soot and less smell.
Better equipment. A conversion is a chance to put in a properly sized, efficient unit, which usually heats the house more evenly than the oversized oil boiler it replaced.

Connecticut utilities also run rebate and financing programs that take some of the sting out of the up-front cost. Those change year to year, so we point you to the current ones when we scope the job.

When it does not make sense

We talk people out of conversions more often than you would expect, and that is the point.

If there is no gas main on your street and the extension cost is steep, the payback can stretch past the point of being worth it. If your oil system is only a few years old and running well, you are throwing away good equipment to chase a savings that will take a long time to catch up. And if you are leaning toward electrification, a cold-climate heat pump might fit your house better than gas at all.

The right answer is the one the numbers support for your house, not the one that sells the biggest job.

Getting a real number

If you are in Glastonbury or a nearby town and want to know what a conversion would actually cost for your home, we will check whether gas is on your street, look at your current setup, and give you a figure you can trust. Reach out here or call and we will set up a time to come by.