Your Strategic Partner for Large-Scale Retrofit.

Delivering Quality-Led Retrofit with Total Governance from Assessment to Lodgement

At Castle Eco Solutions, we understand the unique challenges faced by Local Authorities and Housing Providers across the UK. You need reliable partners who can deliver complex retrofit programmes seamlessly, reduce risk, and truly improve residents' lives. We act as your trusted principal contractor and strategic delivery partner, managing the entire retrofit journey to provide you with complete programme certainty and control.

By meticulously managing every stage, from initial energy assessments to final TrustMark lodgement, we actively mitigate risk for asset managers, ensure full compliance, and deliver consistently high-quality outcomes for your residents.

Our Credentials, Frameworks, Partners & Accreditations

Our comprehensive, turnkey approach ensures your projects are delivered to the highest standards, fully compliant with:

• PAS 2030 / PAS 2035 Frameworks: Guiding every step of the retrofit process.
• TrustMark Quality Requirements: Ensuring robust quality and consumer protection.
• ISO 9001 Quality Management Standards: Upholding excellence in our operational processes.

We pride ourselves on our established network and robust accreditations, demonstrating our capability and reliability.

Our Public Sector Services

We offer a complete suite of services specifically designed to support multi-year, portfolio-level delivery, helping you achieve your housing and sustainability goals:

• Retrofit Coordination & Design: Expert, PAS 2035-compliant oversight of every measure, ensuring integrated and effective solutions.
• Technical Authority & Fabric Performance: Leveraging our deep building physics expertise for optimal system selection, with a critical focus on managing moisture and thermal risk.
• Whole-House Retrofit Installations: Scalable delivery of high-performance insulation, efficient heating systems, and cutting-edge renewable technologies.
• Resident Engagement & Safeguarding: Dedicated liaison to ensure a safe, predictable, and positive journey for all households, particularly vulnerable residents.

Compliance & Data Management: Transparent reporting and rigorous evidence submission, providing robust audit trails and assurance for all funding streams.

Funding & The Warm Homes Plans

We are fully aligned with the Government’s Warm Homes Plan, actively supporting the long-term decarbonisation and improved energy efficiency of the UK’s housing stock. We help our partners navigate and maximise various crucial funding streams:

• Warm Homes Local Grant (WHLG): Empowering local authorities to implement targeted retrofit initiatives for low-income households and vulnerable communities.
• Warm Homes Social Housing Fund (WH:SHF): Delivering multi-measure improvements – including solar PV, heat pumps, and high-performance insulation – to significantly enhance the energy performance of social Housing portfolios.

ECO4 & Flexible Eligibility: Expertly leveraging the Energy Company Obligation scheme to provide deep retrofits for eligible residents, often at no direct cost to the local authority.

Why Partner with Castle Eco Solutions?

Choosing the right partner for large-scale retrofit is crucial. Here's what sets Castle Eco Solutions apart:

• Proven Scale & Delivery: Hundreds of energy-saving measures successfully installed to date, demonstrating our capability for volume delivery.
• Unrivalled Technical Authority: Over 10 years of experience in delivering high-quality fabric and heating improvements, backed by deep building physics expertise.
• Measurable Social Value: We offer a Bespoke Social Value Plan as a managed service, including quantified commitments to local jobs, apprenticeships, and vital energy advice for residents.

Low-Risk Delivery: Our robust approach is governed by stringent internal QA processes, project-specific risk registers, and independent technical monitoring, ensuring smooth project execution and assured outcomes.

See our Social Value & Sustainability Impact here

Case Studies

See how we've delivered real, measurable change for our partners and residents.

Cumberland Council: Local Authority Collaboration

• Castle Eco Solutions worked closely with the Cumberland Council Housing Energy Team to deliver a portfolio-level retrofit project.
• Scope: Successfully retrofitted 20+ properties in the Cumberland area.
• Mechanism: Strategic use of ECO4 Flexible Eligibility to target the homes most in need.
• Outcome: Established a consistent, ongoing delivery model for local authority-led energy efficiency, providing a blueprint for future projects.

Ribble Valley Portfolio: Community-Focused Retrofit

• As a locally based contractor, we've partnered with Ribble Valley Borough Council to support residents across our home region.
• Scope: Upgraded heating and insulation measures for over 40 local households.
• Mechanism: Integrated delivery using both means-tested benefits and flexible eligibility routes.
• Outcome: Dramatically improved thermal comfort for local families while reinforcing our reputation for integrity and professional workmanship within the community.

Rural Renewal: Lampeter, Wales Portfolio

• In 2023-24, we managed a complex decarbonisation project for a portfolio of rural properties in Lampeter (SA48 area).
• Scope: Full decarbonisation of F and G-rated homes with no access to the gas grid.
• Mechanism: Installation of integrated renewable systems, including Air Source Heat Pumps and Solar PV, alongside full-fabric insulation.
• Outcome: Successfully moved G-rated properties from the lowest energy ratings up to EPC B and C, significantly reducing the carbon footprint and energy poverty in rural Wales.