Serial Renovation at LEG

Why? / What? / How?

WHY

Challenge

Climate targets for 2045 and climate legislation of the EU and federal government will yield major effects and opportunities in the building sector

Possible¹ levers for achieving the goal (excerpt)

The shift needed to combat climate change offers great opportunity for innovation in the building sector

possible levers, in some cases currently not yet legally binding - legislation expected to be tightened in line with the measures outlined 2. based on political appeals by Agora Energiewende Source: Federal Government; dena; Agora Energiewende

Market potential

2.1 million MFH in Germany potentially suitable for serial renovation due their age – huge market potential

Building stock in Germany in 000's

Note: MFH = multi-family house

single-family houses and terraced houses with additional potential are not included. Source: dena Building Report 2019, destatis, Housing and Environment Institute

Opportunity Climate Targets 2045

Core elements of serial energy retrofitting ...

E2E control of the process

Interdisciplinary planning

Solution scalable across building
types

High degree of prefabrication

... with significant advantages over the traditional method

Lower renovation costs

Significantly shorter construction time on the building

Increased tenant satisfaction

Less rent rebates/vacancies

Waste reduction

WHAT

Serial renovations with KfW/BEG 55 as the level of ambition for climate neutrality

Energy certificate Energy efficiency classes Ambition level for Renowate solution

Climate pathways for Germany show that climate neutrality in the building sector is only possible through much more comprehensive measures.
KfW efficiency house standard 55 common approximate value for climate neutrality in the building sector
Measures in the KfW 55 standard include both the renovation of building components (e.g. façade, windows) and systems engineering (e.g. heating, ventilation, line).

Achievement of "class A" energy efficiency (Proxy: BEG/KfW 55)

Complete energy renovation of the building envelope
Plant technology optimization, incl. heating exchange
Avoidance of CO2 costs for tenants and landlords

Source: LEG; GEG; KfW; BCG BDI study

Industrialization and serialization of energy renovation as the best approach to managing renovation volumes

Product 1

development & standardization

Insulation facade

Replacement windows/ doors

Insulation basement (ceiling)

Insulation roof

Structure PV/Solar

Ventilation system installation

Line renovation

Renewal heating

Overall crossmodule planning

Target image

Inventory of the buildings

3D scan of the existing building and digital recording of its technology
Transfer to digital tool for planning or module production (BIM vs. PLM) for further renovation process

Cross-module planning ii

Technical planning of the refurbishment solution across trades
Planning of the renovation modules incl. preparation of CAM drawings
Execution planning of the assembly activities incl. logistics planning

Interface to product development

Feedback loop from rehabilitation planning in product development regarding technical design of the modules
Integration of developed modules in BIM for use in planning

Industrial, automated manufacturing

Target image

Prefabrication of building envelope and roof modules

Automated production of façade elements incl. insulation and windows based on BIM model
Production of the roof modules incl. integration of PV/solar systems
Direct ventilation system and line integration into façade elements according to TGA planning

Kitting of the individual parts into renovation modules

Assembly of the renovation modules (i.e., building envelope, roof and heating) per project for logistics
Automated kitting of the modules with auxiliary materials
Just-in-time loading of trucks with building-specific renovation modules

Interface to product development

Feedback loop from production to product development on technical limitations of production or automation possibilities
Optimization of the renovation modules regarding production efficiency/automation

Standardized construction

Target image

Preparation of site and building

Standardized & just-in-time preparation of building sites for assembly team
Preparation of the building stock for assembly activities (e.g., balcony cutting)

Carrying out module assembly

Standardized (scaffold-free) assembly of façade and roof elements and heating according to the execution plan
For tenants minimally intrusive replacement of the windows & line/cable connections incl. a few hours in apartment
Reduction of onsite construction time to a few days (5–10) instead of several months

Interface to product development

Feedback loop from assembly to product development regarding technical limitations in assembly activities
Further development of the modules for easier assembly

HOW

Renowate Ltd. Overview

Renowate GmbH combines real estate knowledge and more than 166,000 existing apartments from the LEG with decades of planning and construction experience of the Rhomberg Group.

Renowate currently consists of 2 managing directors and 12 employees (as of 09/01/2022). Established as a joint venture in January 2022 with locations in Düsseldorf (DE) and Bregenz (AT), it plans to grow to about 25 employees by year-end 2023.

Renowate's goal is to be the decisive solution provider in the field of serial energy-related renovation. This is to be achieved through holistic customer care in the concept of "Renovation as a Service".

Renowate Ltd. Renowate's target USPs

Solution provider for housing industry CO2 reduction in DACH
Holistic renovation approach can be implemented in a short period of time
Digitized value chain throughout the entire processing time
Unique renovation-as-a-service approach that relieves clients of the red tape by taking over services
Client services from a single source
Taking over services such as tenant communication, subsidy advice and application, etc.