Tag: EPC

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The RdSAP Sticking Point: Why the HEM Delay is a 2-Year Strategic Window

Why the HEM Delay is a 2-Year Strategic Window

As we move into May 2026, many London landlords are breathing a sigh of relief. The government recently confirmed that the Home Energy Model (HEM) – the sophisticated new system for calculating energy ratings – has been delayed until late 2027.

While some are using this as an excuse to kick the can of energy efficiency further down the road, we believe this is actually a strategic emergency.

This two-year delay is a golden window. It is your chance to benchmark your portfolio and lock in your EPC ratings while the goalposts are still stationary. Here is why acting now – using the current system – is the smartest move you can make before the 2030 deadline.

Jargon Buster: Energy Terms Explained

Before we dive into the strategy, let’s clear up the alphabet soup of energy regulations:

  • RdSAP (Reduced Data Standard Assessment Procedure): This is the old way of calculating Energy Performance Certificates (EPCs). It’s a simplified checklist where an assessor looks at your boiler, lightbulbs and insulation to give you a score.
  • HEM (Home Energy Model): The new way, coming in 2027. Instead of a checklist, it’s a high-tech computer simulation that tracks how a home uses energy every 30 minutes. It is much harder to pass because it’s much more accurate.
  • Fabric Performance: This is a fancy term for your building’s outer layer. It measures how well your walls, roof and windows actually hold in heat, regardless of what kind of fancy boiler you have.

The Sticking Point: Why the Change Matters

Under the current RdSAP system, you could often game the score. You might reach an EPC Band C by simply adding solar panels or a more efficient boiler, even if the walls are still thin and drafty.

However, the HEM system prioritizes Fabric Performance. In 2027, patching up a property with gadgets won’t be enough. The new model will look at how the building actually performs. If your walls aren’t properly insulated, the new software will be much less forgiving, potentially dropping a current Band C property back down to a Band D or E.

The 2-Year Strategic Window: Benchmarking While Stationary

By delaying HEM until 2027, the government has given you a period where the rules are fixed. Here is how to use this time to your advantage:

1. Lock in Your Band C Now

An EPC certificate is valid for 10 years. If you undertake improvements and get an EPC assessment under the current RdSAP rules in 2026, that Band C rating is locked in legally for a decade. This gives you a massive compliance cushion as we head toward the mandatory 2030 requirements.

2. Benchmarking the Skin of Your Building

Use our surveyor-led approach to perform a fabric audit now. Instead of just looking for the cheapest way to get a certificate, identify the structural weaknesses in your property’s thermal envelope (its skin). Improving insulation now is cheaper than doing it in 2029 when every landlord in London is chasing the same contractors.

3. Avoid the 2027 Cliff

When HEM launches in late 2027, we expect a massive bottleneck. Energy assessors will be retraining, the software will be new, and ratings will likely be more volatile. By acting in 2026, you avoid the chaos and the risk of a rating drop under the stricter new metrics.

Practical Advice for May 2026

  • Don’t Wait: If your properties are currently at a Band D or E, start your retrofit plans this month.
  • Focus on Fabric First: Even though the current rules allow you to cheat with tech, prioritize insulation and high-quality windows. This ensures that even when your 10-year certificate eventually expires, the building is already HEM-ready.
  • Get a Professional Audit: A standard EPC is a tick-box exercise. A Homesearch Properties technical audit will look at your portfolio through a surveyor’s lens, identifying the structural changes that offer the best return on investment.

The Verdict

The HEM delay isn’t a day off, but a head start. By benchmarking your portfolio while the rules are predictable, you protect your asset value and ensure your properties remain bankable and let-able well into the 2030s.

Is your portfolio ready for the 2030 shift? Contact us today for a technical energy review.

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Using HEM Metrics to Future-Proof Your 2030 Portfolio

Using HEM Metrics to Future-Proof Your 2030 Portfolio

The 18th March has officially passed. The consultation period for the Home Energy Model (HEM) – the high-tech successor to the EPC – has concluded, and the government is now processing the feedback that will define the next decade of UK property standards.

If you’re a landlord waiting until the final rules come into place before acting, you’re already behind. Most of the market is still fixated on reaching a Band C by 2030 using the old, soon-to-be-obsolete SAP methodology. At Homesearch, I am advising my clients to look past the letter on the certificate and start looking at the physics of their buildings.

Here is what the post-consultation era means for your London portfolio.

What exactly is HEM?

For years, the EPC has been a bit of a snapshot: a static, often surface-level estimate of how much it costs to heat a home.

HEM (the Home Energy Model) is more like a 24/7 digital simulator. Instead of a broad annual guess, it uses 30-minute intervals to simulate how a property actually behaves. It doesn’t just care about having a modern boiler; it cares about how much heat your walls, windows, and roof are actually leaking every single hour.

In short, the EPC was about cost. HEM is about performance.

The Shift: From Band C to Fabric Performance Metrics

The biggest mistake a landlord can make in 2026 is patching up a property to hit a Band C. This usually involves adding bolt-on tech – like solar panels or a heat pump – onto a building that is still fundamentally drafty.

Under the new HEM framework, the focus shifts to Fabric Performance Metrics. This measures the Thermal Envelope of your property.

The Thermal Envelope: Think of this as a tea cosy for your flat. It is the continuous boundary of insulation (walls, roof, floor, windows) that separates the conditioned air inside from the London weather outside.

If your thermal envelope is weak, even the most expensive heat pump will have to work twice as hard, leading to higher bills for your tenants and more wear and tear on your hardware.

A Surveyor’s Approach: Audit, Don’t Just Assess

Because I approach property from the perspective of my quantity surveying background, I focus on engineering value rather than just chasing points.

Instead of a standard EPC assessment, I recommend a Structural Energy Audit. This looks at:

  • Thermal Bridging: Identifying the cold spots where heat escapes (often around floor joists or window reveals) that a standard EPC misses.
  • Airtightness: Finding the invisible drafts that make a Band C property feel like a Band E to a tenant.
  • Moisture Risk: Ensuring that as we make buildings tighter, we aren’t trapping damp – a major risk for 2030 compliance.

Why This Matters for Your 2030 Exit or Retention Strategy

By 2030, a property with a patched-up EPC rating will be viewed as a Stranded Asset. Savvy buyers and institutional investors (who are already using HEM-style modeling) will see through a superficial rating.

On the other hand, a property that has been engineered with a high-performance thermal envelope will:

  1. Command Higher Retention: Tenants stay longer in homes that are genuinely warm and cheap to run.
  2. Lower Maintenance Costs: Better fabric performance means less strain on heating systems and fewer damp-related call-outs.
  3. Secure Future Financing: Lenders in 2027 and beyond will prioritize properties that meet the Fabric-First standards of the new Home Energy Model.

The Verdict: Stop Patching, Start Engineering

The 18th March deadline was the starting gun for a more transparent, data-driven rental market. Don’t wait for the 2030 deadline to find out your Band C property isn’t actually fit for purpose.

Ready to future-proof your portfolio? Let Homesearch Properties conduct a technical review of your assets. We don’t just look at the certificate; we look at the structure.

Contact me today for a Fabric-First Portfolio Review.