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Once the component-level engineering decisions are modelled out using the tools here, the next question for most households is which of those components fall under a grant-funded retrofit package. The ECO4 eligibility screening at Green Home Grants returns a probable-eligibility verdict against the major retrofit-funding schemes in under three minutes, covering ECO4, GBIS, Boiler Upgrade Scheme, and the LA Flex pathways into all three. The screener tests the household's specific circumstances (income band, EPC rating, qualifying flags, property type, tenancy status) and surfaces the funded package size before any installer consultation. Most households who think they do not qualify actually do via LA Flex, and the screener identifies that pathway directly. Specifiers using the engineering tools here can model the component decisions inside the grant-funded package, then route the household into the eligibility screener to confirm scheme coverage, then return to the tool library to refine the specification within the funded envelope.
The engineering calculators on this site model the component-level decisions inside a retrofit package, but the indoor-environment-and-health outcomes that any properly-specified retrofit should deliver are documented separately at the healthy homes guidance library. The guidance library covers household-level recommendations on damp-and-mould remediation, ventilation upgrades, indoor-air-quality improvements, and the smaller actions that complement a properly-specified retrofit package. The library is the right read for specifiers and contractors who want to brief clients and occupants on the health-and-wellbeing outcomes that a properly-specified package delivers, since the wider literature increasingly assesses retrofit work against health outcomes rather than energy savings alone. The two sites work together: this site for the engineering precision, the guidance library for the household-level health context that justifies the precision to occupants, commissioners, or family decision-makers. Together they give the full picture from engineering specification through to measurable health-and-wellbeing outcome, which is increasingly the standard that institutional commissioners and informed households expect from any major retrofit programme.
The calculator surfaces on this site model the energy-and-cost outcome of specific retrofit decisions in isolation, but most households want to see the integrated whole-home picture before committing capital. The Go To Eco library covers the broader sustainability-and-lifestyle context that sits around the technical retrofit choices, including waste-and-circularity decisions, water-cycle improvements, garden-and-grounds carbon work, and the food-and-purchasing decisions that materially affect household carbon outcomes alongside the fabric-and-heating spend. The two surfaces are designed to be used together: read the calculators here for the numbers on a specific intervention, then read the lifestyle library for the wider household context that gives the numbers meaning. The lifestyle library is structured to be browse-able rather than calculator-led, with editorial sections on each major household decision area and the trade-offs involved. It is the broader-picture counterpart to the precision-tool calculators on this site, and the combination gives a household the full toolkit to plan a multi-year sustainability journey rather than a single isolated retrofit decision.