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Estimate Your Home Renovation Budget

Built by Kevin Glover · @gloverbuilds · Verified formula

Get cost estimates for kitchen, bathroom, basement, and whole-house renovations by scope and quality level.

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

In this article

Renovation Costs by Project
ROI at Resale

Kosten pro Raum

Badezimmer: 8.000-25.000 €. Küche: 5.000-30.000 €. Boden (Parkett): 40-80 €/m². Malerarbeiten: 8-15 €/m². Fenster: 500-1.500 €/Stück. Dach: 80-200 €/m². Immer 15-20% Puffer einplanen — Sanierungen bringen IMMER Überraschungen.

Förderung

Energetische Sanierung: BAFA 15-20% Zuschuss. KfW-Kredit: günstige Zinsen + Tilgungszuschuss. Steuerliche Förderung: 20% der Kosten über 3 Jahre absetzbar (§ 35c EStG). Energieberater (BAFA-gefördert) erstellt den individuellen Sanierungsfahrplan (iSFP).

⚡ CalcWolf Insight

The most common renovation mistake: starting without a complete budget. The industry rule of thumb: add 20% contingency to any contractor quote. Unexpected issues (hidden water damage, outdated wiring, structural problems) arise in 60-70% of renovations, and the average overage is 15-25% of the original budget.

Frequently asked questions

Wie viel für Komplettsanierung?▾

800-1.500 €/m² bei Kernsanierung. 120 m² Haus: 96.000-180.000 €.

Welche Förderung?▾

BAFA: 15-20%. KfW-Kredit. § 35c EStG: 20% über 3 Jahre. IMMER vor Baubeginn beantragen.

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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 →