Sinegal Estate, an American winery, has secured a consent from the Napa County Planning Commission to increase its production capacity.
The property, which is spread over an area of about 30 acres, houses winery, vineyard and a residence. It was bought for around $20m.
As part of the expansion, the winery will increase its production capacity from 13,200 gallons to 60,000 gallons, reported Napa Valley Register.
The expansion is expected to take place over the next ten years.
Commenting on the approval, Commissioner Heather Phillips said that for planning purposes, the commission has to view the expansion as potentially happening all at once, and has to look at Napa Valley grapes as a finite resource.
"I see 60,000 and I think it needs to be ready to go for 60,000 tomorrow," added Phillips.
"I am just assuming it is the proposed numbers we are dealing with."
Sinegal Estate has also announced plans to produce wine using entirely Napa grapes that meet the county's 75% Winery Definition Ordinance.