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Estimate Window Replacement Costs

Built by Kevin Glover · @gloverbuilds · Verified formula

Calculate the cost to replace windows based on size, type, material, and installation. Compare vinyl, wood, and fiberglass.

📅 Updated April 2026 ✅ Formula verified 📖 4 min read 🆓 Free · No sign-up

In this article

Window Replacement Costs (2026)
When to Replace Windows

Kosten

Kunststoff 2-fach: 300-600 €/Fenster. 3-fach: 400-800 €. Holz: 500-900 €. Holz-Alu: 700-1.200 €. Einbau: 100-300 € pro Fenster. 10 Fenster Kunststoff 3-fach: 5.000-11.000 €. KfW/BAFA-Foerderung: 15-20% Zuschuss bei energetischer Sanierung!

Energieeinsparung

Alte Fenster (1-fach): U-Wert ~5,0. Neue 3-fach: U-Wert 0,6-0,8. Heizkosten-Ersparnis: 15-25%. Amortisation: 8-15 Jahre — mit Foerderung schneller.

⚡ CalcWolf Insight

Window replacement calculator has strong CPC ($8-15) from window manufacturers (Anderson, Pella, Marvin) and installers who advertise aggressively. Searches peak in spring and fall when homeowners feel drafts and plan improvements.

Frequently asked questions

Was kosten 10 neue Fenster?▾

Kunststoff 3-fach: 5.000-11.000 € inkl. Einbau. Minus 15-20% BAFA-Foerderung.

2-fach oder 3-fach?▾

3-fach ist heute Standard in Deutschland (GEG-Anforderungen). Mehrkosten: 30-50% aber deutlich bessere Daemmung.

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Kevin Glover · @gloverbuilds

Founder, CalcWolf · GLVTS · Blickr

All formulas sourced from primary references — IRS publications, peer-reviewed research, and official standards. Results are tested against independent reference calculators before publishing. Rates and brackets updated when official sources change. Editorial policy →