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      Lot: Whole House Decarbonisation

      Our Whole House Decarbonisation Lot supports public sector organisations to improve the energy performance of domestic homes through coordinated retrofit programmes. It enables the design, planning and delivery of multi-measure decarbonisation works aligned to PAS2035:2023 standards. By accessing experienced contractors and consultants through Fusion21, members can implement fabric improvements, renewable technologies and whole property upgrades to reduce emissions and enhance building performance. 

       

      What does the Whole House Decarbonisation lot cover?

      This Lot covers a comprehensive range of retrofit, construction and renewable energy services for domestic dwellings. Projects are delivered in accordance with PAS2035:2023 retrofit standards, ensuring a coordinated whole-house approach to energy improvement and decarbonisation.

      The works and services that are available through this Lot include:

      • Retrofit design, planning and coordination in line with PAS2035:2023
      • Whole-house energy efficiency improvement programmes
      • Fabric improvement measures, including:
        • Solid wall insulation
        • Cavity wall insulation
        • Loft insulation
        • Room and roof insulation
        • Underfloor insulation
        • Draught proofing and airtightness improvements
      • Ventilation solutions, including Mechanical Ventilation with Heat Recovery (MVHR) systems
      • Renewable energy technologies, including:
        • Solar photovoltaic (PV) systems
        • Battery storage systems
        • Solar thermal systems
        • Air source and ground source heating systems
        • Heat networks
      • Metering, monitoring and heating controls
      • Internal and external whole-house refurbishment works, including:
        • Roofing, fascias and soffits
        • Windows and doors
        • Kitchen replacements
        • Bathroom replacements

      This coordinated approach enables members to deliver large-scale retrofit programmes that improve building performance, lower energy consumption and support long-term net zero ambitions.
      What are the required accreditations?

      All suppliers appointed to this Lot must hold relevant organisational accreditations and professional memberships to ensure safe, compliant and high-quality delivery of retrofit and decarbonisation works.

      Required accreditations include:

      • PAS2035:2023 accreditation
      • TrustMark registration
      • Microgeneration Certification Scheme (MCS) for Air Source Heat Pumps and Solar PV
      • Part P Electrical Safety Scheme
      • Gas Safe registration
      • OFTEC certification
      • WRAS accreditation

      These accreditations demonstrate that our suppliers meet recognised industry standards for retrofit coordination, renewable energy installations, electrical safety and heating system compliance.

      Why Choose Fusion21?

      Fusion21 provides fully compliant procurement frameworks designed to make public sector procurement simpler, faster and more effective. Our frameworks give members access to a network of experienced suppliers who are carefully assessed for capability, competence and compliance.

      With more than 1,000 public sector members across housing, education, healthcare and local government, we support organisations to deliver projects that improve buildings, reduce environmental impact and create lasting benefits for communities.

      Our frameworks are designed to provide a clear and compliant route to market while ensuring members can deliver projects confidently and efficiently.

      Social Value and Impact

      Social value sits at the centre of every Fusion21 framework. Through the Whole House Decarbonisation Lot, suppliers work with members to deliver measurable community benefits alongside project outcomes.

      These can include:

      • Creating local employment opportunities and apprenticeships

      • Supporting skills development in green technologies and retrofit delivery

      • Investing in community initiatives and local supply chains

      • Improving living conditions through warmer, more energy-efficient homes

      • Reducing carbon emissions and supporting environmental sustainability

      By embedding social value throughout the procurement and delivery process, our projects generate long-term positive impact for both communities and the environment.

      Information Summary
      • Lot Name:  Whole House
      • Parent Framework(s): Decarbonisation
      • Coverage: UK-wide
      • Applicable Standards: PAS 2038:2021

      Ready to Get Started?

      If you are planning decarbonisation works or retrofit programmes across your housing stock, Fusion21 can help you procure the right suppliers quickly and compliantly.

      Through the Whole House Decarbonisation Lot, you’re connected with proven contractors and consultants who specialise in delivering PAS2035-compliant retrofit projects and whole-house upgrades.

      Get in touch with Fusion21 today to find out how our frameworks can support your decarbonisation goals and help you deliver sustainable improvements across your housing portfolio.

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      CPV Codes:

      • 45320000 Insulation work
      • 45421100 Installation of doors and windows and related components
      • 45261211 Roof-tiling work
      • 45261410 Roof insulation work
      • 45321000 Thermal insulation work
      • 45210000 Building construction work
      • 09331200 Solar photovoltaic modules
      • 09331100 Solar collectors for heat production
      • 45232141 Heating works
      • 45331000 Heating, ventilation and air-conditioning installation work
      • 45421151 Installation of fitted kitchens
      • 45211310 Bathrooms construction work
      • 09300000 Electricity, heating, solar and nuclear energy
      • 45260000 Roof works and other special trade construction works
      • 09323000 District heating
      • 31610000 Electrical equipment for engines and vehicles
      • 45315300 Electricity supply installations

       

      • 31527260 Lighting systems
      • 45100000 Site preparation work
      • 45300000 Building installation work
      • 45400000 Building completion work
      • 71200000 Architectural and related services
      • 71300000 Engineering services
      • 71500000 Construction-related services