The Scheme was launched by the NLA in April 2010 and is free to local authorities. It is also recognised by all local authorities in Wales.
More than 85% of landlords who have completed the Scheme to date have described it as "excellent".
NLA Chairman David Salusbury said: "The NLA Accreditation Scheme provides local government with a valuable vehicle to raise standards within the private-rented sector and local authorities are now waking up to its potential.
"The NLA Scheme provides landlords with a clear way of demonstrating that they are professional by understanding their obligations, as well as the extensive legislation governing the letting of private residential property.
"The fact landlords can become accredited through the NLA’s Scheme without cost to the public purse is an obvious benefit.
"We’re very pleased with the feedback from participating landlords; with 85% of those completing the scheme describing it as ‘excellent’. These individual landlords will now be able to promote that fact that they are accredited by the NLA."
Have your say on this story using the comment section below