Builders working at people's homes must turn down 'obligatory' cups of tea, while bringing their own soap and towels, according to new guidelines.
Trade body Competent Roofer has warned tradespeople must be highly aware of the risks as lockdown is eased, which includes avoiding going inside people's properties as much as possible.
It comes as the Government extended the hours builders could work in residential areas to 9pm Monday to Saturday to help get the industry going.
But unions have warned that without legislation, some unscrupulous bosses could act against the interests of their staff.
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Competent Roofer manager Tracie Hunter told The Sun : “Sadly you can’t invite tradespeople into your home for a cuppa.
“But don’t stop coming up with other safe ways to show your appreciation.”
Other measures include asking permission to use the toilet and always abiding by the two-metre rule.
Tradespeople have also been told to avoid going into shops and to eat outside wherever possible, while sanitising their hands regularly.
On May 11 the Government set out a series of plans on reopening offices and businesses, with non-essential retailers slated to open from June.
The construction and manufacturing industry was also encouraged to return to work, with car makers announcing plans to restart factory lines.
But there has been criticism of the lack of extra protections for workers after the Prime Minister called for employers to use "common sense" rather than enacting new legislation.
The new rules fall under current safety legislation, overseen by the Health and Safety Executive (HSE) which has received £14 million in extra funding.
Last week, the Government said all businesses would need to undergo an assessment to be labelled "Covid-19 secure", running under current health and safety rules, rather than with the introduction of new laws for protecting workers.
It said businesses that want to reopen will need to carry out an online risk assessment with the HSE and place the certificate on display.
Rules include maintaining social distancing - with employers expected to redesign workspaces - staggering start times, creating one-way systems for workers and protecting staff who may be vulnerable.
Business, Energy and Industrial Strategy Committee chairman and Labour MP Darren Jones has written to Business Secretary Alok Sharma also asking the department to lay out its plans for new powers to stop businesses from profiteering during the coronavirus crisis.
The letter also called for help from ministers in supporting small and medium-sized businesses to buy protective kit to make workplaces secure.
Mr Jones said: "Workers must be supported in these difficult times too.
"Many workers will be facing pressures to return to work while having concerns about the safety measures in place."
