Common Landlord Mistakes That Reduce Your EPC

With increasing pressure to bring rental properties up to an EPC rating of C by 2030, many landlords are rushing to make upgrades.

And that's where mistakes often start to happen.

When it comes to energy efficiency, it's not just about what you install — it's about how it's recorded, evidenced and assessed.

Small oversights can:

• Lower your EPC rating
• Waste money on ineffective upgrades
• Force you to redo work you've already paid for

Here are some of the most common mistakes we see and how to avoid them.

This is one of the biggest and most common errors that I see on the day-to-day.

It might seem logical to upgrade old storage heaters with newer electric panel heaters but from an EPC perspective, this can actually reduce your rating.

Why? Because:

• Storage heaters (especially high-retention models) are recognised as more efficient within EPC calculations
• Panel heaters are treated as direct electric heating, which scores poorly

So while panel heaters may look more modern or feel simpler to use, they often perform worse on paper.

Don't assume newer = better. Always check how a system is treated within EPC methodology before replacing it. Be sure to ask your assessor.

Upgrading to high retention storage heaters is generally a good move, but only if you install the right ones.

Here's the catch most installers won't tell you: If the specific make and model isn't listed in the Product Characteristics Database (PCDF), it may not be recognised properly in the EPC assessment.

If it's not recognised, you won't get the benefit in your rating.

Any qualified Domestic Energy Assessor (DEA) should be able to confirm whether a model is compliant before installation. Always verify the model before you buy and install not after.

This is where most landlords lose EPC points without realising it.

If insulation can't be seen, it effectively doesn't exist, as far as the EPC is concerned anyhow.

This applies to:

• Solid wall insulation
• Floor insulation
• Sloped ceiling or roof insulation

If a DEA can't visually confirm it, they need evidence to include it in the assessment.

That evidence must be very specific:

• A photo showing the insulation depth (with a tape measure)
• A photo showing the full area/room OR
• A signed and dated letter from the installer (on headed paper) confirming depth and installation date

Without this, the improvement won't be entered, even if you've spent thousands on it.

If it's not documented, it doesn't count.

For all electric properties, your electricity tariff can directly impact your EPC rating.

A dual-rate tariff (e.g. Economy 7) will typically result in a better score than a single-rate tariff.

However, this only works if it's correctly recorded.

You may see notes like:

“A dual rate appliance(s) is present with a single-rate supply. A single-rate appliance has been used for the assessment.”

This means:

• The system could perform better
• But the EPC has defaulted to a worse assumption due to lack of evidence

To avoid this, you need to provide a utility bill clearly showing your tariff.

If you're on a dual rate — prove it. Otherwise, you're leaving EPC points on the table.

This one's less technical — but still important.

Many landlords instruct EPCs through estate agents without realising there's often a markup.

It's not uncommon to see:

• £160+ via an agent vs
• £80–£120 when booking directly

You can find accredited assessors through the official government register or when running your property through Ecograde.ai.

Always check the direct cost before going through a third party.

But…Are They Still Worth It?

Yes — because they're still a legal requirement for renting and selling property in the UK.

With regulations tightening towards EPC C by 2030, they're becoming even more important for landlords.

EPCs are also evolving in the UK and standards are getting an upgrade. There's growing recognition that they don't fully reflect real-world performance and future updates are likely to focus more on actual energy use, carbon impact and smart tech, not just theoretical scores.

Most of these mistakes come down to one thing. Reacting too late, without a clear plan.

I often see Landlords:

• Make quick decisions under regulatory pressure
• Install upgrades without understanding EPC impact
• Miss key details that affect scoring

And the result?

More spend, more frustration and often no meaningful improvement in rating.

Before making any upgrades, step back and look at the full picture:

• What is actually limiting your current EPC rating?
• Which improvements will have the biggest impact?
• What needs to be evidenced and documented?
• How will different upgrades interact with each other?

Because not all upgrades are equal and not all spend delivers results.