Heat Loss Estimator

Wall Area (m²): Wall Type (U-Value): Window Area (m²): Window Type (U-Value): Roof Area (m²): Roof Type (U-Value): Internal Temp (°C): External Temp (°C):

Submit the form to view your results and graph.

🧠 Understanding U-Values

🏠 Walls: Solid walls and PRC types are heat losers unless insulated.
🪟 Windows: Old single glazing leaks energy like mad. Triple is tight.
🏠 Roofs: Loft insulation is your cheapest win – max it out.

• U-values show how quickly heat escapes. Lower is better.
• Upgrade the worst first – that’s where the money leaks.

Go deeper

Straight-talking property guides

Practical reading drawn from site experience — without the usual industry fog.

Rising Damp: The Myth, The Mess, and the Real Fixes book cover

Property guideRising Damp: The Myth, The Mess, and the Real FixesView on Amazon

Buying a House – The Things Surveyors Miss book cover

Homebuyer guideBuying a House – The Things Surveyors MissView on Amazon