TrustMark has approved two scheme operators, the Confederation of Roofing Contractors and the British Board of Agr謥nt.
There are now 20 approved scheme operators, with another 15 under consideration.
The CRC was formed in 1985 to protect the general public against dishonest roofing contractors.
Since then the Confederation has expanded its membership to become an elite organisation specialising in the provision of roofing services to all market sectors.
Allan Buchan, director of the CRC says: We are delighted to have achieved scheme operator status for TrustMark.
Our objective is to ensure that the public recognise CRC members as meeting the highest standards within the roofing industry.
We strongly believe TrustMark is another positive step that sets apart qualified, reputable tradesmen.
The BBA is the UKs major approval body for new building products and their installation.
Its Agr謥nt Certificates are recognised by specifiers and other industry decision-makers as proof that the products covered by them have been rigorously assessed and will allow compliance with Building Regulations to be achieved.
Martyn Reed, operations director of the BBA, says: The BBA is pleased to announce that it has been approved to become a TrustMark scheme operator.
This will enable installers who are members of schemes run by building product manufacturers and who meet the BBAs stringent requirements to also gain TrustMark accreditation.
Its a powerful sign that they are committed to fair-trading practice.