WHQS Retrofit Waste: The Hidden Data Gap in Welsh Social Housing

The Scale of the Challenge

Wales has 245,310 social homes under the scope of the Welsh Housing Quality Standard. As of March 2025, 47% of those homes — roughly 109,795 properties — remain non-compliant with WHQS 2023 requirements. The Welsh Government has committed £5.52 billion over the next decade to bring them up to standard, and the Optimised Retrofit Programme (ORP) has already allocated £254 million to support decarbonisation across the social housing stock.

That is an enormous volume of construction activity. Every retrofit generates waste: old boilers, single-glazed windows, insulation stripped from cavity walls, kitchen units, bathroom suites, roofing materials, and hundreds of smaller items. The question is: where does it all go?

What the Data Shows — and What It Doesn't

The most recent Construction and Demolition (C&D) waste survey by Natural Resources Wales, covering 2019, recorded 3.43 million tonnes of waste generated across the Welsh construction sector. Of that, 90% was sent for reuse, recycling, or recovery — a figure that positions Wales among the best performers in the UK.

However, that headline number masks a significant gap. The NRW survey captures waste at the sector level, not at the property level. There is no standardised mechanism for tracking what comes out of an individual WHQS retrofit, how much is diverted from landfill, and what the associated carbon impact is.

For housing associations reporting against the Welsh Government's Sustainability Reporting Standard (SRS) or preparing Environmental, Social, and Governance (ESG) disclosures, this is a problem. Without property-level waste data, compliance reporting relies on estimates and assumptions rather than auditable evidence.

The Cost of Not Knowing

The financial implications are direct. Landfill Disposals Tax in Wales stands at £130.75 per tonne from April 2026, with the unauthorised rate at 150% of standard — approximately £196 per tonne. Every tonne of material that could have been diverted but was not represents a measurable cost to the programme.

Beyond tax, there is the question of skip efficiency. A typical WHQS retrofit property generates between 1.5 and 3 tonnes of waste. Mixed skips — the default on most sites — are expensive and inefficient. Materials that could be segregated and recycled (timber, metals, plasterboard, plastics) are instead sent to transfer stations where recovery rates are lower and costs are higher.

Our early pilot data suggests that on-site source segregation can reduce skip costs by up to 40% per property, while simultaneously increasing the diversion rate and generating auditable data for every material stream.

What Needs to Change

The WHQS 2023 framework requires social landlords to produce Transitional Energy Performance (TEP) certificates — 75% of stock by September 2026, 100% by April 2027. These certificates focus on energy performance, not waste. But the two are connected: you cannot retrofit at scale without generating waste, and you cannot claim genuine sustainability credentials without accounting for it.

What the sector needs is a property-level waste tracking system that:

• Records every material removed from a retrofit property
• Tags and photographs each batch with QR codes
• Calculates carbon savings using recognised factors (ICE database, WRAP CarbonWARM2)
• Produces exportable compliance data aligned with SRS and ESG frameworks
• Quantifies social value where materials are routed to community reuse or social enterprises

This is exactly what TroCymru was built to deliver. Our platform closes the data gap between retrofit activity and environmental reporting, giving housing associations the evidence they need — not estimates.

The Opportunity

Wales is investing billions in its social housing stock. That investment should generate not just warmer homes, but auditable proof that the construction waste from those programmes was managed responsibly. The data infrastructure exists. The carbon factors exist. The social enterprise partnerships exist. What has been missing is the on-site system to connect them.

The WHQS retrofit programme is the largest construction programme in Welsh social housing history. It deserves a waste management approach that matches its ambition.

TroCymru provides on-site waste interception, QR-based material tracking, and WLCA-aligned carbon reporting for WHQS retrofit programmes across Wales. Contact us [blocked] to discuss a pilot.