DGNB BREEAM since 2007 since 1990 LEED since

DGNB BREEAM since 2007 since 1990 LEED since 1998 HQE Minergie Eco P CASBEE since 1998 since 2001 since 1996 HK Beam since 2003 Green Star since 2003 Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Comparing the Benefits of International Building Sustainability Assessment Methods

• • • Background Defining the Problem Objective Existing Precedents Methodology Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Table of Contents

Economy Investment Cost Operating Cost Site Function Resource Comfort Energy Ecology Social Health Impact Transport Doctoral Session - ERES Conference - June 2009 Design Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology Concept of Sustainability

BREEAM DGNB since 2007 since 1990 LEED since 1998 Minergie P Eco HQE since 1996 CASBEE since 1998 since 2001 HK Beam since 2003 Green Star since 2003 Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology Sustainability Standards

Lack of transparency for developers, owners and tenants regarding expenses and benefits • What certificate can provide which benefits? • Which opportunities and which risks are associated with obtaining a certificate? • Is it just a new name for the same old product? ► Research into the economy of construction and occupancy of certified properties. Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology Defining the Problem

Deciding factors for developers, owners and tenants Which certificate requires… • …higher initial expenses? • …more benefits? Expenses Benefits Developer/Building Owner • Audit cost • Investment cost Developer/Building Owner • Improve sale/rental price • Subsidies • “Green” Image Occupant/Tenant • Sales/rental price Doctoral Session - ERES Conference - June 2009 Benefit of Certified Properties ≥ Conventional Properties ? Occupant/Tenant • Improve comfort and health • Reduce waste of resource • Reduce operating cost Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology Objective

• Overview of several tools on the German market analyzing their framework, structure and criteria > DGNB most comprehensive • First opinion surveys among developers, owners and tenants > Growing interest • Comparing costs and benefits of certified and conventional buildings (for example US: LEED) > It’s worth investing ‣ Need of Further Research • Find out the needs of developers, owners and tenants in detail • Compare these needs to the Benefit of International Standards as well as with existing German standards and laws Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology Existing Precedents

Module 1 Surveys and interviews with: • Developers • Building owners • Tenants ‣ Identify the interests of developers, building owners and tenants ‣ Define economic criteria for Case Study Research Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology

Module 2 Empirical Research of Case Studies of certified versus conventional properties • Structural measures • Construction Strategy • Occupancy Strategy • Local Market Economic criteria Doctoral Session - ERES Conference - June 2009 Office Buildings Built after 2000 Certified by LEED, BREEAM and DGNB Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology

Module 3 Analysis of Case Studies Description • Structural measures • Construction Strategy • Occupancy Strategy • Local Market Input/Output Factor Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology

Module 4 Comparison of Case Studies ‣ Identifying factors for success and/or failure ‣ Drawing conclusions regarding the value of each certificate DGNB BREAAM LEED Convent. Input/Output Factor Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Background | Defining the Problem | Objective | Existing Precedents | Methodology

BREEAM LEED HQE DGNB Minergie Eco P CASBEE HK Beam Green Star Doctoral Session - ERES Conference - June 2009 Universität Stuttgart | Institut für Bauökonomie | Dipl. -Ing. Maike Buttler Thank you for your time and attention!