It has also increased its loan-to-values (LTVs) to 75% across the full range of products for limited companies and individuals.
The range is available both direct and via intermediaries for both purchases and remortgages.
For limited companies, MBS has introduced longer term 5-year products and new 2-year fixed rate products, alongside a reduction to the 2-year discount products.
For individuals, the society has also reduced its 2-year discount rate products and reintroduced a 2-year and 5-year fixed rates.
James Mann, product marketing manager at The Monmouthshire Building Society, said: “There’s currently limited availability in the market for holiday let products, specifically for limited companies.
“Our new range is intended to support both individuals and limited companies, increasing the term and LTV across the full range.”