The survey also showed that just over a third are having difficulties undertaking work in their properties because of either themselves or their tenants, self-isolating.
The National Residential Landlords Association's proposed extension would be in line with the Government's approach to MOT certificates.
This would provide the time that landlords need to ensure routine, but legally binding checks can take place at a point when the danger of spreading the virus in rental properties is at least reduced.
The NRLA is also calling on the Government to delay until next year the introduction of new routine Electrical Installation Condition Reports which are due to come into force from 1st July. These will involve inspectors checking the wiring in all rooms of a property, possibly taking a number of hours, making it impossible for tenants to properly isolate.
Ben Beadle, Chief Executive of the NRLA, said: “Whilst landlords should ensure that urgent work to ensure properties are safe for tenants is carried out, routine maintenance and checks need to be delayed to prevent the spread of coronavirus.
“Extending the life of gas and electrical safety certificates will protect landlords and tenants from unnecessary contact and provide landlords with legal protection from enforcement action where they are simply unable to get such work undertaken through no fault of their own.”
