Concerns have been reported across the Isle of Skye and the Outer Hebrides as well as other island groups about the installation of home energy products.
Now Trading Standards teams across the North of Scotland are reminding householders to be on their guard if they are approached by individuals offering to install home energy products.
They say this follows recent reports of traders operating in the area, offering free insulation works under Government-funded schemes to properties without the formal approval required to do the works.
Trading Standards teams within Orkney Islands Council, Highland Council, Comhairle nan Eilean Siar, and Shetland Islands Council have all received such reports.
A Comhairle spokesperson said: “This is a complex market and there are many home energy grants available to householders to have products such as roof or wall insulation, boilers or solar systems installed for free, some even offering future payments to the recipient.
"This has led to an increased volume of complaints over the last few years from householders who feel they have been misled on their doorstep when they realise what they have got is not necessarily what they thought they were getting.
"Also, it is an offence for any trader to claim to operate under such a scheme without the appropriate approval or authority. I’d urge any householder to check first the validity of any scheme, product, installer and payment before entering into a contract, whether it is free or not.
"We are aware of rogue traders operating and with that come, the now usual, practices of misleading the householder into agreeing for works and poor workmanship, the latter can leave the householder having to foot the bill to repair any damage caused.”
The Councils involved are currently working with installers to deliver energy efficiency improvements to properties.
Further information on schemes to provide free home energy improvements can be found by contacting Home Energy Scotland for free on 0808 808 2282 callers will be given free and impartial advice.