The UK needs 50,000 extra trained retrofit workers by 2030, but the current pipeline delivers barely a tenth of that. That gap is the subject of a new research report from the Construction Industry Training Board (CITB) and the Federation of Master Builders (FMB), published this week to shape a Sector Skills Plan for retrofit.
As reported by Specification Online, the research will inform a dedicated plan to address the chronic shortage of skilled workers needed to insulate Britain’s draughty housing stock and install low-carbon heating systems.
What the skills gap means for your retrofit project
Right now, a homeowner in the South West wanting an air-source heat pump faces an average wait of eight months for a certified installer. In parts of Scotland, the wait can stretch beyond a year. The same story repeats for solid-wall insulation and solar panel installation. The bottleneck is not demand, it is people.
Ofgem data shows that the Boiler Upgrade Scheme received 7,500 applications in the first six months of 2024, but only 4,200 installations were completed. The difference is installer capacity. When a household cannot find a qualified fitter, they stick with their gas boiler, and the EPC rating stays stuck at D or E.
The CITB-FMB report aims to fix this by mapping the exact skills needed, from basic draught-proofing to advanced heat pump commissioning, and aligning training courses with real-world demand. For homeowners, that means fewer cowboys and shorter queues.
Who qualifies, and who doesn’t
The Sector Skills Plan targets three groups: new entrants to construction, existing tradespeople retraining, and specialist retrofit coordinators who oversee whole-house upgrades. The FMB has pushed for a national retrofit qualification that sits alongside existing NVQs and apprenticeships.
But the catch is funding. The CITB estimates that training one retrofit installer costs between £8,000 and £15,000. The current government has allocated £1.5 billion for heat pump grants and insulation schemes under the Warm Homes Plan, but none of that money is ring-fenced for training. Without a dedicated skills budget, the plan risks being a wishlist rather than a workforce.
The Energy Saving Trust has long argued that retrofit skills should be treated as a national infrastructure priority, like training enough electricians for the grid upgrade. The CITB report echoes that, but the Treasury has not yet signed off on a dedicated training fund.
What it costs a typical 3-bed semi, and what could change
Installing a full retrofit package, cavity wall insulation, loft insulation, double glazing, and an air-source heat pump, on a typical 1960s three-bed semi costs between £18,000 and £25,000. The heat pump alone, after the £7,500 Boiler Upgrade Scheme grant, still leaves the homeowner with £5,000–£8,000 to find.
Part of that cost is installer scarcity. When demand exceeds supply, prices rise. The FMB estimates that a 30% increase in qualified installers could reduce installation costs by 10–15% within three years, purely through competition. The Sector Skills Plan, if implemented, could accelerate that timeline.
Yet the report also acknowledges a deeper problem: many existing construction workers are over 50 and nearing retirement. The industry needs to attract younger workers into what is still seen as a dirty, cold, outdoor job. The FMB wants to rebrand retrofit as a high-tech, well-paid career, but that requires marketing budgets that small builders do not have.
Households planning a retrofit should check the MCS Installer Database now and book early. The skills plan will take at least 18 months to produce trained workers. For those who can wait, the payoff could be lower prices and better quality. For those who cannot, the message is simple: get on the waiting list today.
Frequently Asked Questions
The plan will take 18–24 months to produce trained workers. Homeowners should expect no immediate change in wait times, but if fully funded, the plan could cut average waiting lists by 30–50% within three years.
Yes, potentially. Increasing the number of qualified installers should reduce installation costs by 10–15% through competition, according to the FMB. However, this depends on the plan receiving sufficient government funding for training.
