Some local residents are against the proposals which would include an exhibition centre as well as other tourist attractions.
The €19 million project includes a visitor centre with a cafe and 'ramblers' lounge, a tree canopy walk and new carpark for 275 cars.
It's expected to triple visitor numbers to the popular walking spot in the Dublin Mountains to 300-thousand people a year.
The Save The Hellfire Campaign group says four years of hard work is paying off, and is thanking more than 23,000 people who have supported it.
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