Open-plan living is one of the most popular design choices in modern UK homes. However, when it comes to Energy Performance Certificate (EPC) ratings, homes with partial open-plan layouts present unique challenges. The removal of walls and partitions can change how heat is distributed, how insulation works, and how energy efficiency is measured.

1. How Open-Plan Layouts Affect Energy Efficiency

While open-plan designs create spacious, modern interiors, they can reduce energy performance if not carefully managed:

  • Heat distribution issues – larger connected spaces may be harder to heat evenly.

  • Increased heat loss – fewer internal barriers mean heat escapes more quickly.

  • Ventilation balance – open areas can make draught-proofing and airflow control more complex.

👉 Learn more about our services: EPC Assessors in London

2. Benefits of Partial Open-Plan Layouts

Not all open-plan designs negatively impact EPC scores. Partial layouts, where some separation is retained, can actually improve energy performance by:

  • Zoning heating – maintaining smaller enclosed areas that can be heated separately.

  • Better light distribution – natural light flows more freely, reducing reliance on artificial lighting.

  • Ventilation flexibility – airflow can be managed with a mix of open and closed sections.

3. EPC Challenges in Open-Plan Homes

Assessors will take into account how the layout influences:

  • Space heating demand – whether radiators or underfloor heating are oversized or undersized for the space.

  • Air tightness – large, open zones may highlight weak points in insulation.

  • Energy modelling (SAP) – which factors in internal heat transfer between zones.

👉 Book your EPC inspection: Booking

4. Improving EPC Scores in Open-Plan Properties

Homeowners can mitigate potential EPC issues by:

  • Installing zoned heating controls to reduce wasted energy.

  • Using thermal breaks (such as sliding doors or partial partitions) to retain heat in key areas.

  • Optimising glazing and insulation to counteract open space heat loss.

👉 Check our Pricing for EPC services.

5. Professional EPC Assessment

A qualified EPC assessor will:

  • Evaluate how the open-plan areas affect heat demand.

  • Review insulation, glazing, and heating distribution efficiency.

  • Provide tailored recommendations to balance design and energy performance.

👉 Speak with our experts: Contact Us
👉 Learn more: About Us