The deadline is now firm

The government has confirmed that all privately rented homes must reach a minimum EPC rating of C by 1 October 2030, for both new and existing tenancies. The penalty for letting a non-compliant property without a valid exemption is rising from £5,000 toward £30,000 per property.

For investors this is no longer a vague future risk. It is a dated capital cost that belongs in every hold-or-sell decision you make between now and 2030.

The methodology is also moving

There is a second change that matters. The current SAP-based EPC is being replaced by the Home Energy Model, which scores how well a property retains heat rather than how much energy it consumes. The new model is expected to run alongside the old one from late 2027 and become the basis for compliance toward the end of the decade.

The practical effect is that fabric quality, insulation, windows and airtightness will count for more, and a property's headline rating could move under the new metric. Two homes with the same SAP score today may score differently under the Home Energy Model.

The retrofit maths

Here is the simple framework we use on every older property:

  • D to C is usually achievable for £3,000 to £8,000: loft and cavity insulation, LED lighting, a smart thermostat, sometimes a new boiler or heating controls.
  • E to C typically runs £8,000 to £15,000 and may need solid-wall insulation or window upgrades.
  • F or G stock, common in pre-1919 solid-wall terraces, can cost £15,000 to £25,000 or more, and some properties cannot reach C without disproportionate spend, which is where exemptions come in.

Against that, model the downside of doing nothing: an unlettable asset in 2030, or a forced sale into a discounted market of other non-compliant stock.

Why this shapes what we buy

This is one of the clearest reasons we focus on newer and new-build stock in the cities we cover. A modern apartment is typically already an EPC B or C, which removes the 2030 retrofit liability entirely. The premium you pay for an efficient building today is, in part, the retrofit cost you are choosing not to inherit.

For older stock the rule is simple: price the retrofit into the offer, or do not buy it.

The bottom line

EPC C by 2030 is a known, dated cost. Treat it like one. On new purchases, either buy efficient or discount for the works. On your existing portfolio, get the assessments done now while there is time to spread the spend rather than scramble in 2029.