As of 15 June 2025, domestic Energy Performance Certificate (EPC) assessments in England, Wales, Scotland, and Northern Ireland will undergo a major transformation with the rollout of RdSAP 10 software. Spearheaded by the Department for Energy Security and Net Zero (DESNZ), this update aims to enhance accuracy, reflect modern building practices, and drive the UK toward its net-zero targets. For Domestic Energy Assessors (DEAs), the changes mean updated data-collection protocols, refined calculation methodologies, and new features for renewable technologies—and they’ll also lead to longer on-site visits and, consequently, higher EPC fees. In this article, we’ll explore what’s new in RdSAP 10, how it affects your EPC ratings, and why you should expect price increases for EPCs and energy performance assessments, particularly in light of the EPC Changes June 2025. (Energy Trust, Bluewire Hub Ltd)

1. Why RdSAP 10 Matters

The Reduced Data Standard Assessment Procedure (RdSAP) underpins EPCs for existing dwellings, providing the basis for energy-efficiency ratings that influence property valuations, rental regulations, and government incentives. The version in use since 2019 (RdSAP 9.94) has been due for a comprehensive overhaul to align with the UK’s evolving building stock and environmental goals. RdSAP 10 represents this first major leap forward, incorporating lessons from the Climate Change Committee’s net-zero roadmap and Government consultations on the Home Energy Model. DEAs will see more precise assessments of heat loss, renewable technologies, and carbon emissions—critical metrics as EPCs become increasingly central to policy instruments such as the Minimum Energy Efficiency Standards (MEES) and forthcoming mortgage-linked incentives. (GOV.UK, Elmhurst Energy)

2. Release Timeline and Preparation

• Specification Published: September 2023 (BRE)
• Training & CPD Rollout: From May 2025, all Accredited Bodies will integrate RdSAP 10 modules into their CPD sessions, ensuring assessors are up to speed on new protocols (Assessor Hub, Elmhurst Energy).
• Official Go-Live: 15 June 2025, when all accredited EPC software must migrate to RdSAP 10 (Energy Trust, Bluewire Hub Ltd).

Accreditation schemes (e.g., Elmhurst, Stroma, ECMK) are hosting webinars and issuing guidance documents. DEAs should begin reviewing the RdSAP 10 specification now, undertake relevant training, and upgrade data-capture equipment (e.g., tape measures, thermal imaging devices) in anticipation of increased measurement requirements. (Assessor Hub, EPC Training)

3. Key Changes in Data Collection

3.1 Comprehensive Window Measurements

Under RdSAP 10, every window in the dwelling must be measured and logged in full. This replaces the previous “typical window area” assumption and improves the precision of heat loss calculations. Expect site-time increases of 20–30 minutes per property due to:

• Manual measurement of frame dimensions (height, width) for each window (EPC Training, Energy Trust).
• Detailed recording of glazing types (single, double, triple), frame materials (uPVC, timber, aluminium), and presence of thermal breaks (EPC Training, Elmhurst Energy).

3.2 Enhanced Insulation Profiling

Insulation inputs now support finer gradations:

3.3 Room-In-Roof Differentiation

Two separate “Room in Roof” types must now be identified: simplified or detailed. Detailed entries necessitate measurements of gable walls, common partitions, and roof slopes. This granularity aims to capture the thermal performance of loft conversions and attic bedrooms more accurately. (Elmhurst Energy, Assessor Hub)

3.4 Air-Tightness and Ventilation Options

RdSAP 10 introduces a broader array of ventilation types—mechanical extract, MVHR, trickle vents, and air-tightness test results where available. Where testers can supply an air-permeability test report, DEAs can input actual leakage figures, significantly improving the EPC’s reliability. (buildcomply.co.uk, Elmhurst Energy)

4. Methodology and Calculation Enhancements

4.1 Updated Thermal Properties

Thermal conductivity (U-values) for walls, roofs, and floors have been recalibrated to reflect modern insulation materials. This brings the RdSAP model in line with current British Standards and tested material performance, reducing discrepancies between predicted and actual energy use. (EPC Training, Elmhurst Energy)

4.2 Renewable Technology Integration

RdSAP 10 formally recognizes small-scale renewables, including:

• Battery Storage: Allows assessors to model on-site solar storage, adjusting import/export dynamics.
• PV Diverters: Models the benefit of diverting excess PV generation to electric hot water systems.
• Other Micro-Generation: Small hydro and combined heat-and-power (CHP) units can now be entered.
  This leads to more accurate estimated energy savings and carbon scores, crucial for homeowners investing in renewables. (Elmhurst Energy, AES Sustainability Consultants)

4.3 Carbon Emissions Focus

With stricter carbon targets, RdSAP 10 calculates “CO₂ per m² per year” rather than just site energy use. This shift means properties with low-carbon heating (e.g., heat pumps) may see a proportionally greater uplift in their environmental rating, even if kWh consumption remains similar. (Elmhurst Energy, AES Sustainability Consultants)

5. Impact on EPC Ratings

By improving data fidelity and expanding technology inputs, RdSAP 10 is expected to produce:

• Higher accuracy: Reduced margin of error between modelled and actual bills.
• Potential rating shifts: Well-insulated homes with renewables may gain up to 5 rating points, while poorly insulated properties without ventilation control could lose points.
• Carbon score differentiation: Homes with low-carbon heat sources will perform better on the Environmental Impact scale than on Energy Efficiency alone.

DEAs should prepare clients for possible rating changes when RdSAP 10 assessments replace older EPCs—even without physical upgrades, ratings may change simply due to new calculation rules. (Energy Trust, Elmhurst Energy)

6. Increased Assessment Time and Cost Implications

The richer dataset and longer on-site processes mean that typical assessment times will rise by an estimated 25–40%. With average RdSAP 9.94 visits taking 45–60 minutes, assessors should budget up to 90 minutes under RdSAP 10. Consequences include:

1. Reduced daily throughput: From 8–10 to 5–6 surveys per day.
2. Higher operational costs: Increased travel time, data-entry labour, and training expenses.
3. Fee adjustments: Most DEAs and accreditation bodies are reviewing pricing. Typical EPC fees may rise by 15–30% to cover the extra time and QA requirements.

Homeowners and landlords should expect higher quotes for EPCs and energy performance assessments post-June 2025. DEAs are advised to update fee schedules in advance and communicate the reasons—namely, enhanced accuracy and regulatory compliance. (EPC Training, Assessor Hub)

7. Preparing for RdSAP 10: Practical Steps for DEAs

1. Attend Accredited Training: Secure CPD slots on RdSAP 10 modules immediately.
2. Upgrade Equipment: Invest in precise tape measures, laser distance meters, and thermal imaging cameras.
3. Revise Data Templates: Customize your data-capture forms to include new fields (windows, ventilation, renewables).
4. Software Testing: Participate in pilot tests with your software provider to ensure a seamless June switchover.
5. Client Communication: Draft new service proposals explaining the benefits of RdSAP 10 accuracy and the rationale for fee increases.
6. Join Industry Forums: Engage in BRE and accreditation scheme webinars to stay updated on FAQs and errata. (Assessor Hub, AES Sustainability Consultants)

8. Frequently Asked Questions (FAQs)

Q1: Will my existing EPC remain valid after June 2025?

Yes—existing certificates remain valid for 10 years, but for new listings and government schemes, an RdSAP 10 EPC will be required for assessments carried out after 15 June 2025 (Bluewire Hub Ltd, GOV.UK).

Q2: How much more will EPCs cost?

While exact figures vary by region, most assessors anticipate a 15–30% fee increase to reflect longer on-site times and data processing (EPC Training, Assessor Hub).

Q3: Are there any exemptions?

Exemptions remain the same (listed buildings, temporary structures, houses of worship), but DEAs should confirm with their accreditation scheme whether certain data-collection steps can be waived when valid building records exist (GOV.UK, Elmhurst Energy).

10. Finally

The June 2025 rollout of RdSAP 10 represents a watershed moment for EPC professionals and homeowners alike. By demanding finer data-capture, integrating renewables, and re-focusing on carbon metrics, the new methodology promises more accurate, actionable certificates—albeit at the price of longer visits and higher fees. DEAs who prepare now—through training, equipment upgrades, and software testing—will gain a competitive edge, offering clients the most reliable energy-efficiency evaluations on the market. And by adopting SEO best practices, you’ll ensure that property owners and landlords find your updated services precisely when they need them most.

Embrace the change and position yourself as an RdSAP 10 expert—your clients, and your bottom line, will thank you.

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The push for a sustainable future is gathering pace, and 2025 is a pivotal year for homeowners eager to upgrade their properties. Retrofit is a comprehensive program that aims to enhance home energy efficiency, reduce energy consumption, and lower utility bills. In this article, we’ll explore everything you need to know about retrofit and the various funding options available to help you make your home greener.

Understanding Retrofit

Retrofit is more than just a trendy term—it represents a coordinated effort between government agencies, financial institutions, and energy experts to modernize residential properties. The program is designed to help homeowners reduce their carbon footprint, save on energy bills, and contribute to a more sustainable environment. Key aspects of the retrofit program include:

• Comprehensive Home Assessment: Professional evaluations identify areas where energy improvements are most needed.
• Tailored Upgrade Plans: Customized strategies target improvements in insulation, heating systems, windows, and renewable energy installations.
• Seamless Implementation: Partnerships with certified contractors ensure that all work complies with the latest energy efficiency standards.
• Long-Term Savings: Retrofit not only focuses on environmental benefits but also helps reduce long-term household expenses.

Funding Options for Energy-Efficient Home Upgrades

Upgrading your home’s energy efficiency has never been easier, thanks to an array of funding options available in 2025. Whether you’re considering grants, loans, or rebates, there are several financial avenues designed to support your retrofit project.

Government Grants and Incentives

Many governments are committed to achieving ambitious climate targets, making funding for energy efficiency a top priority. Homeowners can take advantage of various grants that help cover the costs of improvements such as insulation, double-glazing, and renewable energy installations like solar panels.

• Eco-Upgrade Grants: These grants typically require a preliminary energy audit to showcase the potential for energy savings.
• Local Authority Schemes: Additional funding may be available through your local council, especially for community-wide energy projects.
• Tax Incentives: Certain regions offer tax breaks or credits to homeowners who invest in upgrades that reduce their property’s carbon footprint.

Green Loans and Financing Programs

For those looking beyond grants, green loans offer another robust funding option. Many banks and specialized lenders provide favorable interest rates and flexible repayment plans specifically tailored for energy-efficient home improvements.

• Low-Interest Loans: These loans are designed for projects that meet energy-saving criteria.
• Pay-As-You-Save Schemes: Innovative financing options allow you to repay the cost of upgrades with the savings generated on your energy bills.
• Energy Efficiency Bonds: Some financial institutions offer bonds that pool resources for larger-scale energy projects, providing another way to fund your retrofit.

Utility Company Rebates and Incentives

Utility companies are also playing a significant role in promoting energy efficiency by offering rebates or discounts on equipment and services. These initiatives are designed to help reduce overall energy demand.

• Smart Meter Rebates: Incentives are available for installing smart meters that monitor and help reduce energy usage.
• Efficiency Upgrade Discounts: Reduced rates are offered for upgrading to energy-efficient appliances and heating systems.

How to Qualify and Apply

Eligibility Criteria

Each funding option comes with its own set of eligibility requirements. Common criteria include:

• Property Age and Type: Programs often target older homes that stand to benefit the most from energy upgrades.
• Energy Audit Requirements: A certified energy audit may be required to qualify for funding.
• Income and Ownership: Some schemes are specifically designed for owner-occupiers, while others may extend to landlords or rental property owners.

Steps to Apply

1. Conduct an Energy Audit: Start with a professional assessment of your home’s current energy performance.
2. Research Funding Options: Identify available grants, loans, and rebate programs that align with your retrofit project.
3. Prepare Your Application: Gather all necessary documentation, such as audit reports, contractor estimates, and proof of ownership.
4. Submit and Follow-Up: Apply through designated platforms or contact your local authority for further guidance.

Maximizing the Benefits of Retrofit Upgrades

Prioritize High-Impact Improvements

Focus on upgrades that offer substantial energy savings. Improvements like enhanced insulation, high-efficiency boilers, and renewable energy installations not only reduce your energy bills but also add long-term value to your property.

Partner with Certified Professionals

Working with experienced, retrofit-approved contractors ensures that your project meets the required standards. Their expertise can also simplify the process of applying for funding.

Stay Updated on Policy Changes

Funding programs and incentives for energy efficiency are constantly evolving. Stay informed about new schemes or changes in policy to ensure you’re taking full advantage of available resources in 2025.

How Eden Energy Can Help You Obtain Retrofit Grants & Funding

When it comes to navigating the world of retrofit grants and funding, partnering with a trusted expert like Eden Energy can make all the difference. Eden Energy offers a comprehensive service designed to simplify the entire process, ensuring that you not only secure the funding you need but also complete your retrofit project with confidence.

Expert Property Assessment

Eden Energy begins by assessing your property to confirm its suitability for retrofit improvements. This in-depth evaluation considers key factors such as insulation, heating systems, and overall energy performance. By thoroughly understanding your property’s current status and how occupants use energy in their home, Eden Energy can determine which upgrades will yield the best energy savings and ensure if you qualify for the available grants and funding.

Guidance Through the Grant & Funding Application Process

Navigating the various grant and funding options can be overwhelming, but Eden Energy is here to help. Our team of experts will guide you through every step of the application process—from gathering the necessary documentation to completing the application forms correctly. Whether you’re a homeowner or a private or social tenant, Eden Energy ensures that you meet all the eligibility criteria and maximize your chances of securing financial support.

Accessible Funding for Homeowners and Tenants

Eden Energy understands that energy efficiency is a priority for everyone, regardless of your housing situation. That’s why they offer support not only to homeowners but also to private and social tenants. With tailored advice and dedicated support, Eden Energy makes it easier for all eligible applicants to access retrofit grants and funding. Their commitment is to help you transform your property into an energy-efficient home that benefits your wallet, the environment, and your overall quality of life.

Your Partner in the Green Revolution

By choosing Eden Energy, you’re partnering with a team that is passionate about sustainable living and energy efficiency. Their comprehensive services ensure that you can take full advantage of the retrofit funding available in 2025, making your property upgrade smooth, cost-effective, and environmentally responsible. Let Eden Energy be your trusted guide on the journey to a greener, more energy-efficient home.

Embrace the opportunity to transform your home with the help of Eden Energy, and secure the retrofit grants and funding you need to make a lasting impact on your energy efficiency and the environment.

Retrofit is paving the way for a future where energy efficiency is within every homeowner’s reach. With an array of funding options—from government grants and green loans to utility company rebates—2025 is the ideal time to invest in your home’s energy future. Whether your goal is to reduce your carbon footprint, lower your energy bills, or increase your property’s market value, the retrofit program offers the support you need to make a meaningful change.

Embrace the green revolution today and explore the comprehensive funding solutions available for retrofit upgrades. By understanding the ins and outs of retrofit and navigating the diverse funding landscape, you can make informed decisions that benefit both your wallet and the environment, setting your home on a path to a more energy-efficient future.

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In a significant move to accelerate the nation’s journey toward net zero emissions, the UK Government has relaunched the Net Zero Council with a renewed mission-led approach. The revamped council aims to drive decarbonisation across all sectors, support thousands of jobs, and foster greater collaboration between government, industry, and civil society.

A New Mission-Led Approach

The council’s relaunch is part of a broader government strategy designed to harness diverse expertise and innovative solutions. By engaging a wide array of industry leaders, trade unions, local authorities, and representatives from civil society, the council seeks to provide expert advice on the UK’s net zero strategy. This initiative comes at a time when the government is actively rethinking its approach to environmental policy, ensuring that all voices contribute to a collective transition toward a greener economy.

Expanding Membership and Diverse Perspectives

Originally established under the previous government in 2023, the council was paused during the July 2024 general election. Its relaunch now reflects the Labour government’s commitment to inclusivity and sustainable economic growth. Key changes include:

• Broadened Representation: In addition to major corporations, the new council incorporates voices from the Trades Union Congress, Design Council, and local government bodies such as the Local Government Association.
• Industry Leaders Return and New Entrants: Prominent players like Siemens, Nestlé, and HSBC have resumed their roles, while new members from sectors such as finance (Aviva Investors) and public interest groups join the council.
• Enhanced Civil Society Input: By integrating representatives from charities, trade unions, and environmental organisations, the council ensures that strategies address both economic and societal challenges.

Strategic Priorities for 2025–2026

At its inaugural meeting on 5 February, council members set an ambitious agenda for the coming years. The key priorities include:

• Sector Roadmaps: Developing detailed transition plans for high-emitting industries to guide both businesses and investors.
• SME Support: Helping small and medium-sized enterprises decarbonise, ensuring they can benefit from the net zero transition.
• Public Engagement: Informing government approaches to engage the public in environmental initiatives and developing new tools to facilitate widespread participation.
• Coordinated Action: Addressing cross-economy challenges by coordinating efforts across sectors to maximise both economic and societal benefits.

A newly formed delivery group will oversee these workstreams, ensuring that progress is monitored and that the council’s objectives are met with collective and decisive action.

Leadership Driving Change

The council is co-chaired by Energy Secretary Ed Miliband and Shirine Khoury-Haq, CEO of the Co-operative Group. Their leadership underscores the council’s dual commitment to energy security and economic transformation. In a recent statement, Ed Miliband highlighted the economic potential of a clean energy future:

“Businesses and leaders across our country recognize that clean power and accelerating towards net zero represents the economic opportunity of the 21st century. It will protect bills, create jobs, and tackle the climate crisis. By working in partnership, we can drive the investment, innovation, and industrial transformation needed to make the UK a clean energy superpower.”

Shirine Khoury-Haq added:

“Working urgently for a faster, fairer transition to a greener, cleaner economy is an absolute imperative. For the sake of our planet and every community here in the UK and around the globe, it’s crucial we work together to unlock the significant opportunities the transition will bring for economic growth.”

A Vision for a Clean Energy Future

The council’s relaunch is a cornerstone of the Labour government’s “Plan for Change,” which focuses on creating new jobs and ensuring a fair transition towards a sustainable future. By integrating economic growth with environmental sustainability, the government aims to make energy affordable and secure while bolstering investment and job creation across the country. The council’s insights are expected to help shape strategies that not only mitigate climate change but also unlock substantial economic and societal benefits.

The full list of council members is anticipated to be released soon, promising an even more diverse and dynamic group of leaders dedicated to driving the UK toward a net zero future.

This comprehensive restructuring of the council signifies the government’s commitment to a collaborative, mission-driven approach, positioning the UK as a future clean energy superpower while balancing economic growth with environmental responsibility.

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