Swansea-based Lewis Pies is to spend £700,000 on extending its facilities so that they are "large enough to take our expansion plans for the next decade", it said.
The premises in Forestfach will be extended this autumn to feature a new 7,500sq ft factory bolted onto the existing unit.
The work, due to be completed in January next year, will feature a new butchery, deep-freeze and packing area for raw products.
"We’re expanding all the time, despite the fact I thought we’d never have to expand again," said joint-MD Wilfred Lewis, who opened the site in 1996.
The £10-million-plus turnover business has witnessed sales growth of around £750,000 over the past two years, supplying bake-off savouries and bread alongside frozen confectionery and ready-baked products nationally.
In March, it absorbed the staff and machinery from liquidated local rival Celtic Savouries.