Enhancing Energy Efficiency of the Existing Building Stock: Is There a Need to Harmonise the Law of Residential Leases? - Journal of European Consumer and Market Law View Enhancing Energy Efficiency of the Existing Building Stock: Is There a Need to Harmonise the Law of Residential Leases? by - Journal of European Consumer and Market Law Enhancing Energy Efficiency of the Existing Building Stock: Is There a Need to Harmonise the Law of Residential Leases? 13 1 Journal of European Consumer and Market Law