Are you a landlord looking at an EPC rating of D or below and wondering whether ordering a new EPC is enough to meet the 2030 requirements? Look no further. The difference between an EPC and a PAS 2035 Retrofit Assessment could determine whether your improvement programme delivers genuine long-term performance: or leaves you facing costly retrofit remediation services later.

The government’s Warm Homes Plan 2026 sets a clear direction for privately rented homes in England and Wales: landlords will need to achieve EPC Band C by 1 October 2030, subject to exemptions and transitional arrangements.

However, the future standard is not simply about obtaining a better EPC letter. Landlords will need to consider the performance of the building fabric alongside the efficiency of the heating system or its smart readiness. That requires a more thorough, whole-house approach.

At CPH Retrofit, we bring more than 15 years of hands-on experience, including our background as retrofit installers. We know why recommendations that look sensible on an EPC can fail when they reach the building site. We also understand how to turn assessment data into a practical, compliant and cost-effective retrofit plan.

EPC vs Retrofit Assessor: What Is the Difference?

An Energy Performance Certificate (EPC) provides a standardised snapshot of a property’s energy performance. It gives the property an energy rating from A to G and includes broad recommendations, such as:

• Loft insulation
• Cavity wall insulation
• Heating system upgrades
• Double glazing
• Solar photovoltaic panels
• Low-energy lighting

An EPC is useful, particularly as an initial benchmark. It can help you understand the current rating of a property and identify potential improvement measures.

However, an EPC is not a full retrofit strategy. It may not adequately capture the building risks, installation sequencing or interactions between measures. It is also not designed to replace a detailed condition survey or a PAS 2035-compliant improvement plan.

A Retrofit Assessor, by contrast, investigates how the whole building performs and how proposed measures will work in practice.

What Does a PAS 2035 Retrofit Assessment Include?

A PAS 2035 Retrofit Assessment is a more comprehensive evaluation of the property. It provides the technical information required to support a safe and coordinated Whole House Retrofit.

A competent Retrofit Assessor will typically examine:

1. The building fabric
   This includes walls, roof, floors, windows, doors, insulation levels, thermal bridging and construction type.

2. Existing defects and risks
   Damp, mould, condensation, penetrating moisture, structural concerns and poor maintenance can all affect whether retrofit measures are suitable.

3. Ventilation and airtightness
   Improving airtightness without considering ventilation can reduce indoor air quality and increase condensation risk. Measures must be designed together.

4. Heating and hot water systems
   The assessment should consider the age, condition, efficiency and compatibility of existing systems with future improvements.

5. Occupancy and property use
   How a home is occupied affects heating demand, ventilation requirements and the practical suitability of different measures.

6. The sequence of improvements
   Measures should be installed in a logical order, with future works considered from the beginning.

This is why a PAS 2035 Retrofit Assessment is so important. It creates a reliable foundation for design, coordination, installation and future evaluation.

Why an EPC Alone Is Not Enough for EPC C by 2030

The future private rented sector standard is expected to use a new dual-metric approach under the Home Energy Model. In practical terms, landlords will need to demonstrate:

1. Fabric performance at Band C or above, showing that the property retains heat effectively; and
2. Either heating system efficiency or smart readiness at Band C or above, depending on the final requirements and route selected.

This represents a significant change in emphasis. A property may achieve an improved EPC score through relatively simple measures, but still have underlying fabric or building-performance problems.

For example, an EPC recommendation may suggest installing a new heating system without first addressing:

• Poor insulation continuity
• Excessive air leakage
• Inadequate ventilation
• Damp or moisture movement
• Cold bridging around openings
• Unsuitable wall construction
• Incompatibility between insulation and existing materials

We have seen first-hand how these issues can create a performance gap between what the EPC predicts and what the property delivers. A measure can be technically valid in isolation but unsuitable for that particular building.

That is the central distinction:

An EPC tells you where the property sits on a rating scale. A PAS 2035 Retrofit Assessment helps establish what needs to happen, in what order, and with what risks.

The £10,000 Cost Cap Does Not Remove the Need for Planning

Under the planned Warm Homes Plan framework, landlords are expected to invest up to £10,000 per property towards reaching the required standard. For lower-value properties, a percentage-based cap may apply.

If a property still cannot reach the required level after eligible improvements have been completed up to the cap, a cost-cap exemption may be available. However, the cap is not a reason to spend money on disconnected or poorly sequenced measures.

You need to understand:

• Which improvements provide the best value
• Which measures are technically suitable
• Whether repairs must be completed first
• Whether one measure could prevent a future improvement
• How ventilation and airtightness will be managed
• Whether the proposed works address the whole dwelling

This is where retrofit measure modelling adds value. At CPH Retrofit, we compare potential measures and help you identify the most effective route before work begins. Our aim is to ensure your budget supports a coherent improvement plan rather than a collection of isolated upgrades.

Transitional Recognition Before 1 October 2029

Landlords should also be aware of the transitional arrangements.

An existing EPC showing Band C under the current rating methodology, achieved and lodged before 1 October 2029, is expected to receive transitional recognition until the EPC expires or is replaced. This may allow some landlords additional time before needing to demonstrate compliance under the new dual-metric methodology.

However, relying on a last-minute EPC strategy carries risks:

1. EPC availability and assessment capacity may become more pressured.
2. A property below Band C may require more extensive work than initially expected.
3. Building defects can take time to investigate and remedy.
4. Certain improvements may require design, planning or tenant liaison.
5. Retrofit delivery programmes need coordination, not just certification.

The government’s Warm Homes Plan provides the wider policy context, but detailed rules and implementation arrangements may continue to develop.

The Role of the Retrofit Assessor and Retrofit Coordinator

The Retrofit Assessor and Retrofit Coordinator have different responsibilities.

Retrofit Assessor

The Retrofit Assessor gathers the property information that informs the retrofit plan. Under current scheme requirements, a Retrofit Assessor generally needs:

• A recognised Domestic Energy Assessor qualification
• At least 20 hours of additional retrofit-specific training
• At least 12 hours of that additional training delivered in a classroom setting
• At least 10 hours of relevant CPD each year, including certificated learning requirements

The qualification matters, but experience matters too. A competent assessor should be able to recognise how buildings behave: not simply record what is visible.

Retrofit Coordinator

The Retrofit Coordinator manages the wider PAS 2035 process and oversees risk management, design development, compliance and delivery. The role typically requires a Level 5 Diploma in Retrofit Coordination and Risk Management, or an equivalent qualification.

The Coordinator helps ensure that:

• Assessment findings are acted upon
• Designs reflect the actual property
• Installers are appropriately qualified
• Measures are sequenced correctly
• Risks are documented and managed
• Quality assurance is maintained
• Handover and evaluation are completed properly

Our retrofit coordination service gives clients a dedicated partner to manage these requirements from assessment through to delivery.

Why Practical Installer Experience Makes a Difference

There is a major difference between identifying a measure on paper and delivering it successfully on site.

Our 15 years of practical experience as installers gives us a valuable perspective when assessing properties. We understand the challenges created by:

• Hard-to-treat solid wall homes
• Non-standard construction
• Period and traditional buildings
• Limited access and restricted sites
• Poorly detailed junctions
• Incomplete insulation
• Existing damp and mould
• Ventilation systems that have been altered or neglected

We also understand the importance of sequencing. For example, improving airtightness without planning ventilation can create new risks. Installing insulation before resolving water ingress can trap problems within the building fabric. Replacing heating equipment before reducing heat demand may lead to an inefficient or oversized system.

A practical assessor can identify these issues early, helping you avoid variations, delays and failed technical monitoring.

Retrofit Remediation Services: The Cost of Getting It Wrong

When a retrofit project is based on inadequate information, the consequences can be serious. You may face:

1. Unplanned remedial work
   Defects discovered during installation may require additional repairs and redesign.

2. Technical monitoring failures
   Non-compliant work can lead to rejected evidence, funding complications or rework.

3. Resident dissatisfaction
   Homes may remain cold, uncomfortable or affected by damp and mould.

4. Higher project costs
   Correcting an unsuitable measure is often more expensive than designing it correctly from the start.

5. Future restrictions
   A poorly chosen improvement may make future measures more difficult or expensive.

Our retrofit remediation services help identify and address problems that could compromise energy efficiency or compliance. We can also support wider technical monitoring and quality assurance requirements, including C3 technical monitoring.

Preparing for the Warm Homes Agency

The Warm Homes Agency is expected to become operational around April 2027, although its exact statutory role, implementation arrangements and responsibilities remain subject to government decisions and legislation.

For landlords, installers and housing organisations, the direction of travel is clear: quality assurance, competent delivery and robust documentation will become increasingly important. PAS 2035, TrustMark and associated compliance requirements are likely to remain central to publicly supported retrofit activity.

Now is the time to review your property portfolio rather than wait for the final deadline.

What should landlords do now?

1. Audit your EPCs and identify properties rated D, E, F or G.
2. Check EPC expiry dates and transitional eligibility.
3. Commission a PAS 2035 Retrofit Assessment for complex or hard-to-treat homes.
4. Model improvement options against the £10,000 cost cap.
5. Identify repair, damp, ventilation and airtightness requirements.
6. Develop a Whole House Retrofit programme with realistic sequencing.
7. Appoint a qualified Retrofit Coordinator where required.
8. Keep clear records of assessments, works, costs and exemptions.

Choose a Retrofit Strategy, Not Just an EPC Letter

If your objective is to achieve EPC C by 2030, ordering an EPC is only the starting point. You need reliable property data, practical measure modelling and a coordinated delivery plan.

At CPH Retrofit, we provide a one-stop service covering domestic EPCs, PAS 2035 Retrofit Assessments, retrofit coordination, technical monitoring, air pressure testing and energy efficiency consultancy.

Our installer background means we assess buildings with the realities of delivery in mind. We do not simply recommend measures: we help you understand how those measures will perform together.

Are you ready to prepare your properties for the 2030 standard? Contact CPH Retrofit today to discuss your portfolio, assessment requirements or Whole House Retrofit programme.

Disclaimer: This article is provided for general information only and does not constitute legal, regulatory or financial advice. Government policy, legislation, implementation dates and technical requirements may change. You should obtain current professional advice before making decisions about retrofit works, EPC compliance or exemptions.