The initiative will see the lender fund projects which are sustainable and aim to reduce carbon emissions.
The green offering will be available on standard properties with an EPC rating of A to C.
It will be available at 65 and 70 per cent loan to value (LTV) with two and five-year fixed options. Rates begin from 3.04 per cent with a 1.25 per cent product fee. Loans sizes range between £50,000 up to £1.5m.
The range is not available on new-build properties but conversions are allowed.
Stephen Hogg, chief operating officer at West One Loans’ parent company Enra, said: “This campaign launch is about taking responsibility for the changes we can make to have a positive impact on sustainability and carbon reduction, within the property and housing markets.
“We know we cannot change the whole market alone, but we want to make a positive impact where we can.”
Andrew Ferguson, managing director of West One’s buy-to-let division, added: “It’s an important step in terms of bringing those properties into line with the standards required for a more sustainable and carbon neutral property market.
“We will continue to expand our product range in the coming months, whilst maintaining the same high standards of underwriting, customer service and reliable delivery that intermediaries and clients already enjoy from West One.”
