Bloc Blinds of Magherafelt specialises in made-to-measure roller blinds, and its major customers include the John Lewis department store chain.
It currently employs 69 staff but aims to add 93 jobs over the next two years.
The expansion is being supported with a £465,000 grant from Invest NI.
The investment includes new manufacturing facilities and market development activities to help increase export sales.
Cormac Diamond , the firm's managing director, says the move "underpins our ambition to increase sales particularly in Europe and the US".
He said a new manufacturing facility brings all the firm's production under one roof which will "help increase production and operating efficiencies."
Mr Diamond, whose background is in mechanical engineering, founded the business in the depths of the recession.
He developed easy-to-install, customisable blinds and got his first John Lewis order when a buyer spotted the his products at a trade show.

The 34-year-old captain needed just 54 balls to reach his 12th century in a majestic display against Australia on the first day of the second Test.
It beat the mark of 56 balls set by West Indies great Sir Viv Richards against England in 1986, and equalled by Pakistan's Misbah-ul-Haq in 2014.
"I was trying to hit every ball for four or six," said McCullum.
"Viv was my idol growing up, he was an incredible cricketer. I'm almost a little bit of embarrassed to go past him, to be honest."
New Zealand, who lost the opening game of the two-Test series, were 32-3 at one point on day one in Christchurch, but recovered to 370 all out before Australia closed on 57-1.
McCullum had a big piece of luck on 39, when he sliced James Pattinson to Mitchell Marsh.
But umpire Richard Kettleborough requested a replay which showed Pattinson had bowled a no-ball.
McCullum had reached 82 from 48 balls when Josh Hazlewood came on to bowl and, after failing to score from the first two balls of the over, the skipper turned on the power, hitting a six, followed by three fours, to give him the record.
He finally fell for 145 off 79 balls when he was caught by Nathan Lyon off Pattinson.
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A County Londonderry-based blind manufacturer is more than doubling its workforce in a £4m investment.
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Brendon McCullum scored the fastest Test century in his 101st and final match for New Zealand before retiring.