Damage from the recent storm has driven up requests for roof repairs by more than 1000 per cent, prompting a warning from the Fair Trading Commissioner to consumers about escalating costs.

Job requests for tradespeople in NSW experienced the biggest spike in Parramatta, increasing by 2400 per cent in the three days between June 3 and 6, according to data from trade professional hire site hipages.com.au.

NSW Fair Trading Commissioner Rod Stowe has warned consumers to avoid cold callers and only use licensed contractors for work valued at more than $5000.

"We've had issues in the past when we've had very significant disasters where there have been shortages of material and tradespeople and we have seen costs escalate," he said.