Window & Door ROI Calculator

Calculate energy savings and return on investment from replacing old windows and doors. Professional ROI analysis with detailed payback period calculations.

Window & Door ROI Calculator

Calculate savings and payback period for window and door replacement

Current Setup

Number of Windows

Number of Doors

Total Window Area (m²)

Total Door Area (m²)

Current Window Type

Current Door Type

Planned Upgrade

New Window Type

New Door Type

Window Cost (€/m²)

Door Cost (€/door)

Energy Price (€/kWh)

Climate Zone

Understanding U-Values & Energy Efficiency

Lower U-values mean better insulation and less heat loss through windows and doors

Poor

U > 3.0

Old single glazed windows, uninsulated doors - high heat loss

Fair

U: 2.0-3.0

Standard double glazed windows, basic insulated doors

Good

U: 1.0-2.0

Low-E coated windows, well-insulated doors

Excellent

U < 1.0

Triple glazed windows, passive house standard

Smart Investment Tips

Maximize your return on investment with these professional recommendations

Timing Matters

Replace during renovations or when existing windows/doors need repair anyway

Prioritize Impact

Focus on north-facing windows and entrance doors for maximum energy savings

Check Incentives

Many regions offer rebates for energy-efficient windows and doors