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The company launched its new logo yesterday.
"The new look is the next step on Delta's growth path as we expand and diversify our business and take up the significant challenges to improve, renew, and expand the country's infrastructure," chief executive Grady Cameron said.
Last year, Delta recorded revenue of $103.7 million, up $16.7 million from the year before, and net profit of $5.4 million, up $2.9 million.
Mr Cameron said with the Government's national infrastructure plan showing high expenditure across areas like energy, waste, water, communications, transport and land infrastructure, the company was well placed to take advantage of the opportunities on offer.
He said the company saw "significant opportunities" with lignite in Southland, and oil and gas exploration in the Canterbury Basin.
Irrigation projects around Otago also raised opportunities, he said.
The company has in recent years taken contracts outside Otago, and Mr Cameron said that was "absolutely" something that would continue.
Branding company Designworks created the logo.
While that company was not from Dunedin, Mr Cameron said local companies were involved.
He would not say what targets the company had for growth, or reveal the costs of the logo change across the company.
But he said the growth would benefit Dunedin ratepayers through dividends to the council that helped reduce rates.