The heating is off, the last utility bill is on the table — and you're wondering if it really has to continue like this? Now is the right moment. Those who plan in spring can implement in summer and save from the next heating season.
Why Spring Is Ideal
Your heating costs are fresh in mind — motivation is high
Contractors have more capacity in spring than in the autumn rush
Facade and roof work need dry weather — summer is ideal
Subsidy applications take 4–8 weeks — apply now, start in summer
Your Roadmap: Step by Step
March/April: Analyze Heating Costs
Compare your heating costs over the last 3 years. Are they rising? What's your consumption per square meter? Above 150 kWh/m²a, renovation almost always pays off.
April: Commission Energy Consulting
A certified energy consultant visits your home, inspects the building, and creates an individual renovation roadmap (iSFP). Cost after BAFA subsidy: approx. €850–1,350 (single-family home).
May: Prioritize Measures
Based on the iSFP, you decide which measures to implement first. Not everything has to happen at once — but the sequence should be right (envelope first, then heating).
May/June: Contract & Subsidy Application
Get quotes and sign a contract with a suspensive/resolutory condition. Then submit the subsidy application to BAFA or KfW. Important: A contract without a protective clause counts as project start! Processing time: approx. 4–8 weeks.
June/July: Commission Contractors
Get 2–3 quotes, check references, and verify contractor certifications. Only commission after subsidy approval!
Aug–Oct: Implementation
Ideal weather for facade, roof, and window work. Heating replacement can also be done in autumn — just finish before the heating season.
Before Heating Season: Acceptance & Optimization
Hydraulic balancing, heating curve adjustment, system fine-tuning. This way you get the maximum benefit from your renovation.
⚠️ Most Common Mistake
Signing a contract without a suspensive or resolutory condition — this counts as project start and costs you the entire grant! The rule: First sign a contract with a protective clause, then submit the KfW application. The clause must be in the contract from the start.
Immediate Measures Without a Big Budget
Even without a big investment, you can save energy right away:
- ✓Optimize heating: activate night setback, check flow temperature
- ✓Check and renew seals on windows and doors
- ✓Insulate pipes in the basement (mandatory under GEG!)
- ✓Insulate the top floor ceiling yourself (material: approx. €20/m²)
- ✓Replace thermostatic valves with presettable models
Take the First Step Now
A free initial consultation shows you what's possible for your building — and what it delivers.