The Boiler Upgrade Scheme (BUS) has been a cornerstone of the UK's decarbonisation strategy since its launch in April 2022. As we approach 2026, significant changes to the scheme's structure and funding levels are reshaping how retrofit coordinators, housing associations and installers must approach heat pump installations and fossil fuel replacement projects.
Key Changes to Grant Funding
The most noticeable adjustment for 2026 is the revision to grant amounts. The scheme's funding model has been recalibrated to reflect market conditions and installation costs, with grants now capped at revised levels that differ from the original £5,000 baseline introduced at the scheme's inception.
These changes reflect:
- Updated cost assessments across different property types and heat pump technologies
- Regional variations in installation labour costs
- Increased material and supply chain stabilisation since the scheme's launch
- Adjustments to encourage uptake in harder-to-treat properties
Eligibility Criteria Refinements
Property Type Considerations
The 2026 framework introduces more granular distinctions between property categories. Previously, the scheme treated most residential properties similarly; now, eligibility assessments increasingly account for:
- Building construction type (solid wall, cavity wall, new build)
- Property age and heritage status
- Existing heating system specifications
- Available space for air source or ground source installation
Income and Means Testing
Whilst the core scheme remains available to owner-occupiers regardless of income, there are evolving pathways for low-income households and vulnerable occupants. Retrofit coordinators should familiarise themselves with enhanced support routes that may unlock additional funding or priority installation windows.
What Retrofit Coordinators Must Know
Documentation and Compliance
The 2026 scheme has tightened documentation requirements. All retrofit coordinators should ensure that:
- Energy Performance Certificates (EPCs) are current and meet latest standards
- Quotations align with approved installer lists and quality benchmarks
- Pre-installation surveys are thorough and properly recorded
- All claims include required evidence of fuel poverty status (where applicable)
Timelines and Processing
Applications submitted in 2026 operate under revised processing windows. The scheme has moved towards a more streamlined approval process, but this requires coordinators to submit complete applications with minimal omissions. Incomplete submissions face longer processing delays than previously experienced.
Technology and Heat Pump Types
The 2026 changes clarify support for different heat pump technologies. Air source heat pumps (ASHP) remain the primary focus due to cost-effectiveness, but ground source heat pumps (GSHP) and hybrid systems receive distinct treatment:
- Air source heat pumps: Standard grant pathway with established installation protocols
- Ground source heat pumps: Enhanced grants available where suitable, reflecting higher installation costs and efficiency gains
- Hybrid systems: Specific eligibility rules now clarify when heat pumps combined with existing boilers qualify for support
Integration with Other Schemes
From 2026, the Boiler Upgrade Scheme is increasingly aligned with broader retrofit funding landscapes. Retrofit coordinators must understand how BUS interacts with:
- Local Authority Delivery (LAD) schemes
- Great British Insulation Scheme (GBIS)
- Future Homes Standard requirements
- New Building Standards and Part L regulations
Bundling improvements—combining heat pump installation with insulation or ventilation upgrades—may unlock enhanced support or improved value under integrated pathways.
Practical Implications for Installers and Coordinators
The revised scheme demands more rigorous engagement during the survey and quotation phase. Installers should expect retrofitting coordinators to provide clearer technical specifications and property assessments that directly inform grant decisions.
Training and competency remain paramount. All parties involved must maintain currency with updated scheme rules, approved product lists, and quality assurance standards that have evolved since 2022.
Looking Forward
The 2026 changes signal a maturing scheme moving towards targeted, evidence-based support rather than broad-brush incentives. For retrofit coordinators, this means deepening technical expertise, maintaining meticulous documentation practices, and building stronger relationships with approved installers who can deliver the quality standards the scheme now demands.
Staying informed through official BUS communications, industry briefings and professional networks remains essential as implementation progresses throughout 2026 and beyond.