The gas metering specialist yesterday announced a 40% hike in its dividend as its first half pre-tax profit rose 30.9% to £3.5 million.
Turnover at the Alternative Investment Market listed company was up 42% at £13.2m for the six months to the end of June.
The continued rise in business has led the company to add 30 employees in the year to date to take staff numbers to 106.
Mr Foy said that despite actions such as narrowing corridors at the St Vincent Street office SMS moved into just 18 months ago, he requires more office space as the workforce continues to expand.
Mr Foy said: "If you go back a few years I really wanted to recruit people in their 30s and 40s. They have the experience and they know how they want to get treated themselves.
"But the youngsters we get into our office, these people are so enthusiastic that they have destroyed my prejudice towards them."
Mr Foy said SMS gives three months of training to recruits, many of whom have previously been let go from apprenticeship schemes, as well as ongoing support.
He dismissed fears voiced by some in business that young people are ill equipped for working life.
"They want to get on. They just want a chance," he said. "We do not have any problems finding people with the right attitude."
He said that people skills are increasingly valuable.
"You might think it is just installing gas meters, what more can you do?
"But at the end of the day you want a referral. It is just like going into any of the big retail shops."
Meter installation is carried out by contractors who also receive training at SMS's Glasgow base.
During the first half of 2013 SMS's meter portfolio has increased by 60,000 to more than 400,000 after it won more contracts and existing customers added meters.
Two thirds of group revenues are from domestic smart meters and the remainder from businesses.
The company has adapted its gas metering technology for other sectors such as water and electricity.
The UK-focused business is also exploring opportunities overseas, confident that ongoing trials in South Africa, the Philippines and the United States will lead to contracts.
Mr Foy said: "SMS has had another strong trading period. We have continued to increase the number of customers we serve and have shown again a significant increase in our meter portfolio providing on-going recurring revenue."
SMS will pay a 0.7p dividend on October 18, which it said is a sign of confidence in the business's prospects.
Its shares have rocketed from their 60p listing price in the summer of 2011 although investors showed some caution yesterday with the stock closing down 3.5p or 1% at 335p.