A low Energy Performance Certificate (EPC) rating can impact everything from your property’s market value to your ability to rent it legally. But what really causes poor EPC scores? If your property has received a low rating, understanding the underlying issues is the first step towards improvement.

⚠️ Common Reasons for Low EPC Ratings

1. Poor Insulation

Inadequate loft, wall, or floor insulation is one of the biggest EPC killers. Properties without sufficient insulation lose heat rapidly, increasing energy use and utility bills.

2. Old or Inefficient Heating Systems

Boilers or heating systems that are outdated or poorly maintained can drag down your EPC score. Non-condensing boilers or electric storage heaters, in particular, are often flagged in EPC reports.

3. Single Glazed Windows

Single glazing allows heat to escape easily. Upgrading to double or triple glazing can significantly improve thermal efficiency.

4. No Smart Heating Controls

Lack of programmable thermostats or zoned heating can impact energy control, leading to inefficiency.

5. Lighting

Halogen and incandescent bulbs are less efficient than LED lighting. Replacing old bulbs is a quick, affordable win.

6. Uninsulated Hot Water Cylinder

Properties with non-insulated or old hot water tanks are less efficient and score lower on the EPC scale.

7. Gaps and Draughts

Unsealed gaps around doors, windows, or between floorboards can lead to heat loss, increasing heating demands.

At EPCrate.co.uk, we are experienced EPC assessors providing fast, affordable, and compliant certificates across London.