Planning and urban design consultancy Turley Associates helped Long Barn win over planners at Winchester City Council last week.
Associate director Daniel Wiseman said the original proposals were thrown out by planners wary of allowing a business to expand on greenfield land.
"The decision was reversed following subtle changes to the proposal and strong support from the local community.
"The council now recognises the importance of Long Barn Growers and Distillers as a unique rural offering that provides much needed employment," said Wiseman.
Long Barn has been growing and distilling lavender at an idyllic farm location for over 12 years and produces a range of aromatic beauty and bath products.
Richard Norris is founding partner of Long Barn and runs the business with co-director Jane Marsden and co-founder Andy Rigg.