How Can Developers Improve EPC Ratings Cost-Effectively?
Developers and housing providers face increasing pressure to improve the energy performance of homes. Whether working towards EPC Band C targets, delivering new-build developments, or upgrading existing housing stock, achieving better EPC ratings has become a key consideration across the sector.
The challenge is not simply finding ways to improve EPC performance. It’s finding measures that deliver meaningful results without high cost, disruption, or complexity.
After all, not all SAP points cost the same.
Some improvements can require significant investment or extensive building work, while others can deliver measurable gains with relatively simple installation. Understanding the difference is becoming increasingly important as the industry moves towards higher efficiency standards and lower-carbon homes.
What Affects an EPC Rating?
Energy Performance Certificates (EPCs) are calculated using the Standard Assessment Procedure (SAP), which measures the energy efficiency and environmental performance of a property.
A range of factors can influence a home’s SAP score, including:
- – Heating systems
- – Insulation and building fabric
- – Renewable energy technologies
- – Lighting efficiency
- – Carbon emissions
- – Hot water demand
While insulation, solar PV and heat pumps often receive the most attention, hot water demand can also play an important role in overall property performance.
Talk to an expert today
Common Ways to Improve EPC Ratings
There is no single solution to improving EPC performance. The most effective approach will depend on the property type, existing specification and project objectives.
Some of the most common measures include:
- – Insulation and Fabric Improvements
- Improving insulation can help reduce heat loss. Measures such as loft insulation, cavity wall insulation and upgraded glazing are often considered as part of wider retrofit programmes.
- – Renewable Technologies
- Solar PV and heat pumps can contribute towards improved SAP scores. However, installation costs, available space and property suitability can all influence their viability.
- – Efficient Lighting and Controls
- LED lighting and smart controls can provide incremental gains and are often incorporated into broader energy efficiency strategies.
- – Water and Hot Water Efficiency
- As homes become increasingly energy efficient, hot water can account for a larger proportion of overall energy use. Reducing hot water demand can therefore contribute towards lower energy consumption, reduced carbon emissions and improved SAP performance.
Why Hot Water Demand Matters
Every litre of hot water used within a home requires energy to heat.
While individual savings may appear small, the cumulative impact across an entire development can be significant. This is one reason why developers are increasingly considering water-efficient technologies as part of a whole-home approach to energy performance.
Reducing hot water demand not only supports sustainability objectives but can also contribute towards improved EPC outcomes.
An Overlooked Opportunity for SAP Improvement
Recent SAP modelling undertaken by Elmhurst Energy for a major UK housing provider demonstrated that shower technology can make a measurable contribution to EPC performance.
The modelling found that replacing existing shower systems with Kelda’s Air-Powered™ shower technology could deliver:
- – Up to 6 SAP points when replacing electric showers
- – Up to 2 SAP points when replacing mixer showers
- – Up to 20% carbon reduction per dwelling
- – Particularly strong performance in flats and apartment developments
Unlike many retrofit measures, shower upgrades can often be completed with minimal disruption and installation times of around one day.
For developers and housing providers looking to improve EPC performance cost-effectively, this is a chance to achieve measurable gains with a relatively simple intervention.
Looking Beyond SAP Points Alone
Of course, EPC improvement is rarely about a single measure.
The most successful projects typically balance multiple considerations, including:
- – EPC performance
- – Installation cost
- – Resident disruption
- – Carbon reduction
- – Water efficiency
- – Long-term running costs
Rather than focusing solely on how many SAP points a measure can provide, developers are increasingly assessing the wider value it delivers to both the property and its occupants.
Future-Proofing Homes Through Whole-Home Efficiency
As the industry moves towards lower-carbon housing and future regulatory requirements, taking a whole-home approach to efficiency is becoming increasingly important.
Heating systems, insulation, renewable technologies and water efficiency all have a role to play.
The key is understanding how each measure contributes to overall performance and identifying opportunities that deliver meaningful improvements without unnecessary complexity.
Because when it comes to improving EPC ratings, the goal isn’t simply to gain SAP points.
It’s to gain the right SAP points, in the right places, for the right investment.
Frequently Asked Questions
Yes. By reducing hot water demand, water-efficient shower technology can contribute towards SAP calculations and EPC performance. The impact will vary depending on the property type and existing specification.
Want to Understand the EPC Impact on Your Development?
Speak to our team about project-specific SAP modelling and EPC improvement opportunities.
Related Links
Future Homes Standards: What They Mean
Find Out More
Kelda Showers are recognised within SAP and RdSAP methodology
Find Out More