The Landlord Retrofit Business Case explores the benefits of energy-efficient retrofitting for rental properties. It highlights financial gains like increased property values (up to 19.6%), higher rental income, reduced operational costs, and the appeal to environmentally conscious tenants. It also addresses future compliance with possible EPC rating requirements and the advantages for tenant health and well-being. The note concludes that retrofitting not only improves sustainability but also aligns with financial and tenant retention goals, making it a strategic move for landlords.