Open-plan living has become one of the most desirable home design trends in the UK. Knocking down internal walls to create a brighter, more social living space can transform a property’s appeal. But how does this affect your Energy Performance Certificate (EPC) rating?

Why EPC Ratings Matter

An EPC measures the energy efficiency of a property on a scale from A (most efficient) to G (least efficient). It is legally required for properties being sold or rented. The way your home is designed—including its internal layout—can influence how heat is retained or lost. Learn more about the assessment process on our Services – EPC Assessors in London page.

The Challenges of Open-Plan Layouts

  1. Heat Distribution
    Removing walls means fewer barriers to contain heat. Large open areas may take longer to warm up, requiring more energy and potentially lowering your EPC score.

  2. Insulation Efficiency
    In traditional layouts, small rooms retain heat more easily. Open-plan designs may expose weaknesses in insulation, particularly around windows, doors, or roofs.

  3. Lighting Benefits
    Open-plan homes often enjoy more natural light, reducing the need for artificial lighting during the day. This can offset some of the heating inefficiency in EPC calculations.

  4. Ventilation Considerations
    Larger spaces require balanced ventilation. Without proper airflow, energy consumption for cooling or heating may increase.

Improving EPC Scores in Open-Plan Homes

  • Underfloor Heating: Provides efficient, even heat distribution across large spaces.

  • Zoned Heating Controls: Allows you to heat specific areas instead of the whole open plan, reducing waste.

  • High-Performance Windows: Double or triple glazing helps minimise heat loss.

  • Insulation Upgrades: Strengthening roof and wall insulation is critical for larger, open layouts.

  • LED Lighting: Maximises the benefits of natural light with energy-efficient fittings.

Do You Need a New EPC After Renovating to Open-Plan?

Yes. If you’ve restructured your home to create an open-plan layout and intend to sell or rent, you’ll need a new EPC assessment. Check our Pricing page for costs, or schedule an appointment through our Booking page.

Expert Help for Open-Plan Homes

Design choices can have a big impact on your EPC rating. Our accredited assessors can provide tailored advice to help you enjoy the benefits of open-plan living without sacrificing efficiency. Learn more about us on our About Us page, or Contact Us for personalised guidance.