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Industry Insights8 min readBy New Chapter Homes

U-Values & Energy Efficiency in Modular Homes Ireland

U-values in modular homes explained — what a U-value is, why a lower U-value means lower bills, and how modular construction achieves excellent U-values in Ireland.

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U-Values & Energy Efficiency in Modular Homes Ireland — Industry Insights article by New Chapter Homes Ireland

Looking for the full picture? Read our complete guide to modular homes in Ireland.

U-Values & Energy Efficiency in Modular Homes

A U-value measures how well a building element (a wall, roof or floor) holds heat. The lower the U-value, the better the insulation — and the lower your heating bills. This guide explains U-values, why they matter for modular homes in Ireland, and how modular construction achieves excellent U-values.


What Is a U-Value?

A U-value (thermal transmittance) measures the rate of heat loss through a material — in watts per square metre per degree of temperature difference (W/m²K).

  • Lower U-value = better insulation = less heat loss
  • Higher U-value = poorer insulation = more heat loss

Why U-Values Matter in Ireland

Ireland's climate means heating is the biggest running cost for most homes. A home with low U-values (good insulation) costs far less to heat — and is more comfortable. Irish Building Regulations set maximum U-values for new homes; an A-rated modular home comfortably beats them.


Typical U-Values

| Element | Building Regs max | A-rated modular home | |---|---|---| | Walls | 0.21 W/m²K | 0.12–0.15 W/m²K | | Roof | 0.16 W/m²K | 0.10–0.12 W/m²K | | Floor | 0.21 W/m²K | 0.12–0.15 W/m²K |


How Modular Homes Achieve Low U-Values

  • Integral insulation — panels come pre-insulated, no cold bridging
  • Airtight construction — factory joints are tighter than site-built ones
  • Consistent quality — every panel built to the same spec
  • Engineered systems — insulation, heating and ventilation designed as a whole

See: SIP Panel Houses Ireland and BER A-Rated Modular Homes in Ireland


What to Ask Your Builder

  • What are the U-values? — walls, roof and floor
  • What's the BER rating? — ask for the certificate
  • What's the airtightness target? — air permeability
  • What heating system? — a heat pump is typical in an A-rated home

Talk to Us About Energy Efficiency

At New Chapter Homes, our modular homes are designed for low U-values and an A2 BER standard. Book a free consultation to talk through energy efficiency on your build.

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