Author: Oliver Wakefield-Smith, Founder Digital Signet. Reviewed against DfE Sustainability Strategy (Mar 2025) and Education Estates Strategy (Feb 2026). Verified 22 June 2026.
Salix administers PSDS Phase 4 on behalf of DESNZ. Application windows open in cycles; the Phase 4 envelope continues the multi-year decarbonisation runway through to 2028.
Salix administers PSDS Phase 4 on behalf of DESNZ. Application windows open in cycles; the Phase 4 envelope continues the multi-year decarbonisation runway through to 2028.
Salix scores PSDS bids on lifetime carbon abated per pound, payback gateway compliance, deliverability and supply-chain readiness. Bundled fabric plus heat-pump scopes score higher than standalone heat-pump retrofits.
Per-project caps and match-funding rules are published per scheme cycle; trusts commonly secure 60 to 80 per cent of in-scope CAPEX. Match-funding can come from CIF, Salix Recycling Fund loans or trust reserves.
Phase 4 tightens the payback gateway and rewards PAS 2035 retrofit-coordinator scope and bundled measures. Standalone short-payback measures (LED only) score lower than in earlier phases.