Is gas already there? If so both would have been inspected at time of installation

It depends on your locale and exactly what you're doing. If you need to run a gas line to your kitchen, then you probably do need a permit. If you're just hooking up a new cooktop to an existing gas line then probably not. Best to check with your town's building department.

There is gas to the house - furnace/water heater. But we will need to run the gas line from another room to kitchen. Then convert the current cooktop electrical outlet from 220V to 110V. So sounds like I have to get a permit then?

You need a permit for what you describe.

If you've already got a 220 line in that location, have you considered induction? It gives you the ease of cleanup of an electric with the sensitivity and flexibility of gas...some think it's the best of both worlds.

Trixieinthegarden, thanks for the advice. I've already bought a gas cooktop. I heard that induction is really good except it has requirements for the cookwares.

You need a permit if you live in a jurisdiction where one is required. Out where I live (unincorporated county) there are no permits or inspections needed.

I wondered the same thing, so I checked with our gas company. I found out that yes, a permit is required. They said a licensed plumber has to come do the work. When they are finished, an inspector will come and sign off on it. Only then can the new gas cooktop be installed. When I thought about it, I realized that gas is nothing to fool around with...I want to be 1000% safe. It's not worth risking our safety (or our the safety of surrounding homes, for that matter) by cutting a corner or two.

Chaocai: it will vary by region but I think many regions are like mine where for the gas you wouldn't need a "permit" but just have the work signed off after install which most installers will arrange for when they are done. As for the electrical you can buy a device at home depot (or where ever) that plugs into your 220 range outlet and converts it to a reg 15a 110 outlet and no permit is needed, plus if you or anyone else ever goes electric again, the wires are still there.

From where I need to get the permit