Cutting energy bills in Wales: What homeowners and landlords need to know

As temperatures drop across Wales, energy bills often rise sharply. With a high proportion of older housing stock, exposed coastal weather and sudden cold snaps common across South Wales, many homeowners and landlords feel the impact immediately.

As experienced Cardiff estate agents, Thomas H Wood Estate Agents see first-hand how energy efficiency affects comfort, running costs and long-term property value. Whether you own your home or let a property, taking action now can deliver immediate savings and help future-proof your investment.

Energy efficiency policy: What’s changing

Energy efficiency standards for rented homes are tightening across the UK.

In January 2026, the UK Government published its Warm Homes Plan alongside its formal response to the consultation on improving the energy performance of privately rented homes. This confirmed that the current minimum EPC Band E requirement will be replaced with a higher standard equivalent to EPC Band C by 1 October 2030, with a single compliance deadline for all private tenancies.

The policy is intended to apply across England and Wales, reflecting a UK-wide approach to improving housing standards.

The reforms include:
~ a £10,000 per-property cost cap
~ reformed EPC assessments using new metrics
~ a revised exemptions framework

For Welsh landlords, the message is clear: EPC C is no longer a theoretical target. The framework, deadline and cost limits are now set, and it is widely expected that Wales will implement the new standard ahead of 2030.

Heat smarter, not harder

Lowering your thermostat by just 1°C can reduce heating costs by up to 10%. Using heating timers effectively prevents energy waste by not warming empty rooms, especially in larger Cardiff homes. Many properties across South Wales already have thermostatic radiator valves (TRVs) installed, allowing room-by-room temperature control.

Tackling draughts in common Welsh property types

Draughts are a common issue in period and Victorian homes, particularly in areas such as Whitchurch, Radyr and Llandaff. Simple, low-cost measures such as draught excluders and window seals can significantly improve warmth and comfort.

Why energy efficiency matters when selling or letting in Wales

Energy efficiency is no longer just about comfort. Buyers and tenants are increasingly conscious of running costs, especially during periods of high energy prices. Homes that are cheaper to heat and easier to manage tend to attract stronger interest and help protect long-term value. For landlords, improving efficiency early can also reduce future regulatory risk if minimum standards tighten. For renters, early-year availability can offer a better selection before demand ramps up again ahead of the spring peak.

Key takeaways for landlords

~ EPC Band C has now been confirmed for 2030
~ Improving energy efficiency now can reduce costs and risk. Simple upgrades can lower energy bills, improve comfort, and reduce the likelihood of rushed or costly work if standards tighten.
~ Energy-efficient homes are more attractive to tenants. Lower running costs are increasingly important to renters and can help reduce void periods and protect rental value.
~ Early action puts landlords in a stronger position. Planning improvements gradually is often more cost-effective than reacting to last-minute regulatory changes.

If you’re considering selling, letting or upgrading your property and want local, practical advice, Thomas H Wood Estate Agents are always happy to help.

Call us on 02920 626252 or visit our branches in Whitchurch or Radyr for tailored advice and support in achieving your property goals in 2026