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Looking for clear answers about retrofit compliance?

Our FAQs explain all the basics, including why PAS 2035 and ECO4 scheme compliance is required, plus details about certifications, coordination and what happens post-retrofit. This guide helps people in all of these roles with the process, funding available and the regulations they must meet. Optimize your time, ensure compliance and raise the performance of your energy system through experienced advice from Compliant Retrofits.

General Retrofit FAQs

A retrofit involves upgrading an existing building with modern energy-efficiency measures to improve its thermal performance, reduce carbon emissions, and enhance indoor comfort. This may include improvements like insulation, ventilation, heating systems, and double glazing. Retrofitting is crucial for achieving the UK’s net-zero targets, cutting energy bills for occupants, and extending the lifespan and usability of existing buildings without the need for complete rebuilds. It also helps tackle issues like fuel poverty and unhealthy indoor conditions.
Several signs suggest your home could benefit from a retrofit. These include high energy bills, persistent drafts, dampness or mould, condensation, and an EPC (Energy Performance Certificate) rating of D or below. If your property was built before modern building regulations or has never been upgraded, a professional retrofit assessment can identify the specific areas of energy loss and recommend appropriate improvement measures.
PAS 2035 is the UK’s official framework for domestic retrofit, ensuring a whole-house, fabric-first approach. It mandates thorough assessments, appropriate design, and professional oversight to avoid unintended consequences like damp or over-ventilation. By following PAS 2035, homeowners and contractors ensure the work is safe, cost-effective, and compliant with funding schemes like ECO4. It also increases consumer confidence, reduces rework, and boosts the performance longevity of the retrofit.

 While some retrofitting tasks may involve minor disruption, most are designed to be as non-invasive and efficient as possible. Upgrades like internal wall insulation, boiler replacements, or ventilation improvements can typically be completed within a few days. Work is scheduled to minimise impact on occupants, and many providers offer flexible installation plans and weekend options. Larger projects may take longer but are carefully managed to maintain liveability throughout.

Yes, combining retrofitting with planned home improvements can save time and money. For example, if you’re redoing your kitchen or bathroom, it’s a great time to add insulation or upgrade ventilation systems. Coordinating these tasks reduces duplication of effort, helps streamline the design and build process, and improves the integration of energy-saving measures into your overall renovation goals. It also ensures you don’t miss opportunities to improve the home’s performance while it’s already under construction.

Retrofit Process & Services

Our full-service offering covers every stage of the retrofit journey. It starts with a detailed Retrofit Assessment, followed by custom design and planning under PAS 2035 guidelines. We handle contractor coordination, oversee installations, and ensure all measures are implemented correctly. Post-installation, we conduct quality checks and performance monitoring to ensure long-term success. Our support ensures your project is eligible for government funding like ECO4 and TrustMark accreditation.
A Retrofit Assessment is the initial inspection of your property’s current condition and energy performance. It identifies inefficiencies, structural issues, ventilation problems, and potential risks. Retrofit Design, on the other hand, is the planning phase where a bespoke improvement strategy is developed. This includes selecting suitable materials and measures, modelling expected energy savings, and ensuring the proposed works comply with PAS 2035.
The timeline for a retrofit project varies depending on the scope and scale. A simple single-measure retrofit—such as loft insulation—can take just a few days. A comprehensive, whole-house retrofit involving multiple measures may take several months from assessment through to post-installation monitoring. Key influencing factors include property size, contractor availability, weather conditions, and funding approval timelines.
Yes, we specialise in services that improve your property’s EPC rating. After a retrofit assessment, we identify the most impactful and cost-effective measures—such as external wall insulation, solar panels, or heating upgrades—that can lift your EPC score. We manage the installation process, ensure compliance, and issue a new EPC upon completion, helping you meet regulatory requirements or prepare your property for sale or rent.
Our post-installation compliance checks include a review of all works performed to verify adherence to PAS 2035 and other applicable standards. This includes photographic evidence, ventilation performance, airtightness verification, and occupant feedback. We also assess the expected versus actual energy performance and ensure all documents are compiled for audit or funding purposes.

PAS, ISO & Retrofit Compliance

PAS 2035 is a government-backed standard that outlines how domestic retrofitting should be carried out in the UK. It’s a mandatory requirement for publicly funded schemes like ECO4 and covers all aspects from assessment and design to installation and monitoring. It’s intended for assessors, coordinators, designers, and installers to ensure quality, safety, and performance across all retrofit projects.
The Retrofit Coordinator is the central figure in a PAS 2035 project. They oversee the entire process, from initial assessment through to final quality checks. Their duties include risk management, design review, contractor coordination, occupant communication, and post-installation verification. They ensure compliance with all regulations, protect the client’s interests, and guarantee the health, safety, and effectiveness of the retrofit.
Yes. We help installers meet the technical and operational standards required under PAS 2030. This includes preparing quality management systems, documenting processes, conducting internal audits, and supporting TrustMark registration. Our team works closely with new and experienced installers to guide them through audits and help maintain ongoing compliance.
PAS 2035 governs the overall retrofit process—from assessment and design to monitoring—while PAS 2030 focuses on the installation standards for individual measures. In simple terms, PAS 2035 is about managing the project, and PAS 2030 ensures each task is technically correct. Both are essential for government-backed schemes like ECO4, and they work in tandem to ensure safe, effective outcomes.
PAS 2038 is the retrofit standard for non-domestic buildings, such as schools, offices, shops, and public buildings. It offers a structured framework similar to PAS 2035 but tailored to the different building use cases and energy demands of commercial or institutional properties. Our team supports both public and private sector organisations in achieving PAS 2038 compliance through audits, assessments, and retrofit planning.

What ISO certifications do you support?

 We provide comprehensive support for key ISO certifications relevant to the retrofit and construction sector:
  • ISO 9001 (Quality Management)
  • ISO 14001 (Environmental Management)
  • ISO 45001 (Health & Safety)
  • ISO 27001 (Information Security Management)
Our consultancy services include documentation preparation, internal auditing, staff training, and full certification readiness.
ISO 9001 helps retrofit firms standardise their processes, reduce human error, and ensure consistent service delivery. It’s especially valuable for securing public contracts and gaining TrustMark accreditation. The certification demonstrates a commitment to customer satisfaction, continual improvement, and operational excellence—making it a powerful asset for growing your retrofit business.
Absolutely. We help companies develop integrated management systems (IMS) that merge ISO 9001, 14001, 45001, and PAS 2035/2030 standards into one streamlined framework. This approach reduces duplicated effort, simplifies audits, and creates a more efficient internal structure that supports both operational excellence and regulatory compliance.
ISO 27001 provides a framework for managing and securing sensitive data, including client records, assessment reports, and funding documentation. For retrofit firms dealing with personal data, grant applications, and property records, data security is vital. Achieving ISO 27001 reduces the risk of breaches and boosts trust among clients and funding bodies.

Yes. Our internal audit services evaluate your current operations against the relevant ISO or PAS standards, identify compliance gaps, and recommend corrective actions. We also provide hands-on support in preparing for certification audits, including documentation creation, process mapping, training, and liaison with certification bodies.

ECO4 Scheme & Funding Support

The ECO4 scheme (Energy Company Obligation phase 4) is a UK government initiative that obliges energy suppliers to fund energy efficiency improvements in homes, particularly for low-income or fuel-poor households. The aim is to reduce energy bills and carbon emissions by retrofitting homes with measures like insulation, boiler upgrades, and renewable heating systems. To apply, you must first determine your eligibility based on income, benefits received, or the energy performance of your home. We offer full application support including eligibility checks, coordinating the retrofit assessment, preparing compliance documentation, and submitting your application to energy suppliers or managing agents for funding approval.

Yes, we provide end-to-end support for landlords seeking to improve their rental properties under the ECO4 scheme. Whether you’re an individual landlord or manage multiple properties, we help you:

  • Understand eligibility criteria specific to rental properties.
  • Conduct property assessments and recommend eligible improvements.
  • Coordinate retrofit work through PAS-certified contractors.

Manage compliance documentation, TrustMark registration, and submission to energy suppliers.
 This helps landlords upgrade their properties at little to no upfront cost while improving EPC ratings and tenant satisfaction.

Flexi-Orb (Flexible Energy Oversight Registration Body) is an alternative certification scheme for non-MCS renewable technologies, such as solar PV, battery storage, and heat pumps. It allows installers and retrofitters to achieve recognised oversight without going through the traditional MCS route. This is particularly beneficial for technologies or projects that fall outside the standard funding structures. We support companies and installers with:

  • Flexi-Orb registration.
  • Ensuring installation standards align with compliance frameworks like PAS 2035.
  • Providing documentation templates and audit support.

ECO4 compliance requires a robust set of documents at various stages of the retrofit journey. These include:

  • Retrofit Assessment Reports and occupancy data.
  • Whole-house Retrofit Design (PAS 2035-compliant).
  • Installer PAS 2030 Certification & TrustMark ID.
  • Pre-, mid-, and post-installation photographs.
  • Ventilation assessments and risk evaluations.
  • Coordinator sign-off forms, declarations of conformity, and final EPC certificates.

We ensure all of this is captured and collated into a compliant submission pack to reduce delays or rejections.

Our submission support ensures accurate, complete, and audit-ready ECO4 documentation. Services include:

  • Quality-checking all compliance documentation.
  • Cross-referencing installation and design data with PAS and TrustMark requirements.
  • Uploading evidence to the appropriate portals (e.g., TrustMark).
  • Supporting with feedback from funders or auditors. This service reduces the risk of funding clawbacks or delays and helps installers, landlords, and homeowners secure financial support faster.

Post-Installation & Monitoring

Post-installation monitoring involves tracking the performance of installed retrofit measures (e.g., insulation, heating, ventilation) over a defined period. This ensures the energy savings predicted in the design stage are actually achieved. It includes:

  • Measuring indoor air quality, temperature, and energy usage.
  • Gathering occupant feedback on comfort and performance.
  • Identifying any defects or underperformance for correction.

Post-monitoring helps validate the effectiveness of funded measures and supports continuous improvement in retrofit delivery.

We offer customisable monitoring periods, generally between 6 and 24 months, depending on:

  • The scope of retrofit work.
  • Funding or council requirements.
  • The presence of advanced energy monitoring systems.

During this period, we analyse actual energy use, ventilation patterns, and occupant experiences. Interim and final reports are provided to identify any operational issues and support long-term performance tracking.

If retrofit measures underperform or fail, we act as a neutral third-party consultant to identify causes, such as poor installation, equipment faults, or environmental factors. Our process includes:

  • Independent post-installation inspection and diagnostics.
  • Liaising with installers for warranty claims or remedial work.
  • Ensuring new measures comply with PAS 2035 standards.

We document all resolutions and update compliance records to safeguard against future performance or audit issues.

Yes. TrustMark scores are based on quality, customer satisfaction, documentation, and audit results. We provide a TrustMark readiness audit, identifying gaps in:

  • Workmanship quality.
  • Record keeping and documentation.
  • Feedback and complaints resolution processes.

We also offer training, CRM implementation, and corrective action planning to raise your TrustMark rating, helping your business stand out and gain access to more funded projects.

Installers & Contractor Support

Absolutely. PAS 2030 certification is a must for installers working on funded retrofit projects. Our service includes:

  • Reviewing your processes against PAS 2030 requirements.
  • Preparing documentation (e.g., method statements, risk assessments).
  • Conducting internal audits and mock inspections.
  • Supporting with TrustMark registration and Quality Management Systems.

We guide you through every step of the process, whether you’re new to PAS or seeking re-certification.

We offer a range of bespoke training courses for retrofit professionals, including:

  • PAS 2035 awareness for coordinators, assessors, and designers.
  • Internal auditing and compliance management.
  • TrustMark quality assurance workshops.
  • Document control, data handling, and ISO integration.
  • Training is delivered online or on-site and can be customised for installers, surveyors, managers, or admin staff.

Yes. Our CRM system is designed for PAS-compliant retrofit projects. Features include:

  • Customer and property records management.
  • Document uploads for TrustMark and ECO4 compliance.
  • Installer scheduling and milestone tracking.
  • Audit preparation dashboards and KPI reporting.

It’s a full-service platform built specifically for managing energy efficiency schemes efficiently and securely.

Yes. Our CRM is designed with API integration capabilities, meaning it can connect seamlessly with:

  • Salesforce
  • HubSpot
  • Zoho
  • Microsoft Dynamics
  • And many more.

This integration ensures you don’t need to overhaul your current systems, allowing for data synchronisation, smoother workflows, and improved team efficiency.

Yes, we specialise in helping new entrants into the retrofit sector. Our services include:

  • Business setup support and compliance planning.
  • PAS 2030/2035 training and certification assistance.
  • CRM setup and onboarding.
  • Guidance on applying for ECO4 contracts or subcontractor networks.

With our help, new businesses can fast-track their compliance journey, reduce mistakes, and become competitive in the retrofit market.

Homeowners, Landlords & Public Sector

Our consultancy services are tailored for a broad range of clients:

  • Homeowners seeking to improve energy efficiency and cut energy bills.
  • Landlords looking to boost EPC ratings and comply with new MEES regulations.
  • Housing Associations and Councils managing multi-property portfolios and applying for public funding.
  • Installers and Retrofit Coordinators needing compliance and document support.

We adapt our services to your role, property type, and funding eligibility.

Yes. We provide strategic consultancy and full project delivery services for local authorities and housing associations, including:

  • Multi-home retrofit project design and coordination.
  • ECO4, SHDF, and LADS funding applications.
  • Compliance audits and quality assurance.
  • Data reporting for government targets.

We help ensure retrofit initiatives are cost-effective, scalable, and aligned with national decarbonisation goals.

We use a data-driven approach to improve EPC ratings. After a detailed property assessment, we:

  • Identify specific upgrades that deliver the biggest EPC score boost (e.g., insulation, glazing, low-carbon heating).
  • Estimate costs, payback period, and potential funding options.

Oversee the retrofit and update EPCs post-installation.
 This service helps homeowners, landlords, and sellers meet regulatory standards or increase property value.

Yes. For landlords and letting agents with multiple properties, we offer discounted bulk packages, which include:
  • Coordinated on-site assessments.
  • Centralised reporting for all properties.
  • Batch retrofit design and installer matching.
Full compliance documentation and monitoring. This streamlines your retrofit strategy, reduces administrative overhead, and ensures all properties meet EPC or funding requirements efficiently.
Yes, we provide services across England, Scotland, and Wales. Our team includes local consultants and retrofit professionals experienced with regional building types, housing stock, and funding streams. We ensure all services whether domestic or non-domestic are tailored to local compliance regulations and funding availability.

Our submission support ensures accurate, complete, and audit-ready ECO4 documentation. Services include:

  • Quality-checking all compliance documentation.
  • Cross-referencing installation and design data with PAS and TrustMark requirements.
  • Uploading evidence to the appropriate portals (e.g., TrustMark).

Supporting with feedback from funders or auditors. This service reduces the risk of funding clawbacks or delays and helps installers, landlords, and homeowners secure financial support faster.