The RenoWave project One-Stop-Shop (OSS) model acts as a centralised framework that integrates technical, financial, administrative, and social aspects of the renovation process into one coordinated service. Its overarching goal is to eliminate the fragmentation and complexity that typically hinder large-scale renovations in the multi-apartment building sector by providing building owners, housing associations, and local authorities with streamlined access to expertise, tools, and financial mechanisms.

The OSS model in RenoWave is built around four main, interlinked modules and tools that together create a coherent operational system:

• Data Handling Methodology: This tool enables the systematic collection, processing, and management of building-related data, including technical characteristics, energy consumption, and renovation potential. It supports evidence-based decision-making by helping stakeholders assess renovation needs, prioritise investments, and monitor progress.
• Marketing and Communication Module: Designed to address low awareness and hesitation among homeowners, this module provides strategies, communication templates, and engagement campaigns that build trust and motivate residents to initiate renovations. It focuses on explaining the long-term benefits of energy upgrades, such as cost savings, comfort improvement, and increased property value.
• Guide for Establishing Collaboration Forums: This component supports the creation of collaborative platforms —known as 'collaboration forums'— where key stakeholders such as municipalities, housing cooperatives, financial institutions, and energy experts can exchange experiences, coordinate actions, and develop region-specific renovation pathways. The forums are essential for building local capacity and aligning efforts across public and private actors.
• Technical Assistance Module: This module offers hands-on support throughout all stages of the renovation process, from feasibility studies and financial planning to procurement, quality assurance, and post-renovation evaluation. It helps OSS operators provide professional guidance and ensure that technical and financial solutions are adapted to local conditions and building typologies.

Together, these modules form the backbone of the RenoWave OSS model, which can be adapted and scaled across different countries and administrative systems. The project’s pilot implementations demonstrate how this integrated approach can enhance collaboration between stakeholders, reduce administrative barriers, and significantly increase the rate and quality of energy renovations in multi-apartment housing. Ultimately, the RenoWave tools empower regions to establish fully functional OSS structures that drive the transition toward a more energy-efficient, low-carbon building stock in the Baltic Sea region.

Start date: January 2023. End date: December 2025

Partners:

• County board of Dalarna
• North Sweden Energy Agency
• City of Lappeenranta
• Magistrat of the City Bremerhaven
• Let's renovate the city NGO