Dewhurst's first half revenues increased 22% to £26.1m in the six months to the end of March with profit before tax up 76% at £3.0m.
Adjusted operating profits were ip 61% at £3.1m and earnings per share rose to 25.8p (2016: 13.1p).
The group said its balance sheet remained strong with cash at the period end of £16.0m (2016: £14.0m).
The group said the weaker pound continued to benefit its reported figures throughout the period.
Currency movements increased revenue by approximately £2.6m in the first half.
But the group said it also achieved growth in local sales values at all its companies other than those in North America, which fell back slightly.
Looking ahead, it said: "After strong first half sales, the UK seems to be pausing at the moment.
"Whether this is a short term lull or a longer term trend is not yet clear.
"But it is possible that the greater political and economic uncertainty in the UK since the general election may cause nervousness in our markets.
"Overseas the outlook is more positive.
"We have seen a good recovery in the last couple of months in some areas of North America, but it is not across the board.
"Demand in Australia, on the other hand, continues to be positive in all areas.
"The pound has strengthened a little against our main operating currencies since the end of March and that will, if maintained, reduce second half reported sales and profits.
"However the directors believe that the underlying performance of the Group as a whole is encouraging."