Understand what’s really happening inside your home.
Free, straightforward tools to assess mould, condensation, ventilation and heat loss — built around real building-survey experience.
home
Start with what you want to understand
Choose a calculator, enter a few simple measurements and get an immediate result you can actually use.
Mould Risk Calculator
Check whether surface conditions are likely to support mould growth.
Check mould risk 02Dew Point Calculator
See when moisture in the air could condense on walls, windows or ceilings.
Calculate dew point 03Ventilation Calculator
Estimate the airflow needed to help control moisture in a room.
Check ventilation 04Heat Loss Estimator
Estimate where your home loses heat and what that means for energy demand.
Estimate heat loss 05EWI Benefit Tool
Explore how external wall insulation could improve internal surface temperature.
Explore EWI benefit 06U-Value Checker
Compare the thermal performance of walls and other building elements.
Check a U-value
Turn a few readings into a clearer picture.
Mould and condensation are rarely explained by one number. MouldSafe helps you consider temperature, humidity and the building surface together.
- 1Take simple readingsRoom temperature and humidity are a useful start. Some tools also use surface temperature.
- 2Run the right checkYour figures are assessed using established building-physics calculations.
- 3Use the result sensiblySee the likely risk and practical measures worth investigating first.
Useful enough to save you money?
MouldSafe is free to use. If a tool helped you understand your home, you’ll soon be able to support its upkeep with a small contribution.
