Retrofit plan

A retrofit plan is a standardised, officially recognised document that structures the energy modernisation of a building into clearly prioritised stages. It defines measures, timelines, savings targets and required evidence based on reliable as-is data.

‍

Why is a retrofit plan important?

• Legal certainty and funding: Meets formal requirements and makes funding applications easier through clear documentation and evidence.
• Structure and transparency: Organises measures into sensible short-, medium- and long-term steps with measurable targets.
• High effectiveness: Combines the building envelope, windows and building services into coordinated packages, reducing risks such as moisture, mould or loss of comfort.
• Efficient implementation: Minimises duplicate appointments and change orders; creates clarity around budget, costs, timeline and trades.

‍

How a retrofit plan is created in practice

1. Data collection: Digital measurement, existing plans/as-built documentation, thermal imaging, infrared camera, U-value measurement if required; recording of the current building services condition and consumption data.
2. Analysis: Assessment of the building envelope, including U-values and thermal bridges, system efficiency and user requirements; definition of benchmarks and target values.
3. Measure packages: Building envelope, including insulation and airtightness, windows/doors, building services/control systems and monitoring, coordinated from a technical perspective.
4. Economic viability and CO₂: CAPEX/OPEX, life cycle costs, CO₂ impact and payback periods for each package.
5. Timeline/milestones: Sequence, dependencies, trades, operational interruptions; documentation of risks and alternatives.
6. Quality assurance/evidence: Test and measurement reports, including thermal imaging and blower door testing, updated energy performance certificates and documentation of tolerances/classes.
7. Handover/monitoring: Maintain changes in as-built documentation, BIM or CAFM; track KPIs regularly and iterate the plan.

‍

Contents and format

• Target state: Efficiency class, CO₂ reduction, comfort and regulatory requirements.
• Measure list for each stage: Technical description, quantities and interfaces.
• Costs/benefits: Investment, operating cost effect, CO₂ and payback.
• Timeline: Stage logic, from quick wins to deep retrofit.
• Evidence: References to standards, test reports, funding criteria and responsibilities.

‍

Common mistakes and misconceptions

• Individual measures without a system view: Uncoordinated building envelope and MEP measures can increase the risk of moisture, mould or limited energy savings.
• Retrofitting without data: Missing as-is data, such as geometry, thermal imaging or U-values, weakens planning quality and funding eligibility.
• No QA/evidence: Without documented tests, such as thermal imaging or airtightness testing, effects are difficult to prove.
• Media breaks: Paper lists instead of integrated, versioned data in BIM or CAFM lead to inconsistencies.
• Unclear targets: Missing KPIs, such as

‍

Retrofit plan vs. renovation plan

• Retrofit plan: A formally standardised document with an officially recognised framework, specified at national level.
• Renovation plan: A project-specific roadmap with a stronger focus on implementation depth, quantities and construction workflows. It complements the retrofit plan.

‍

‍