EcoSaving Hub is a small, deliberate decision-support tool for the UK home retrofit market. Five working calculators, six citable data references, and a methodology we publish in full.
Most retrofit "calculators" online are marketing tools dressed up as utilities. They use optimistic install costs (often manufacturer-supplied figures, not real installer quotes), inflated saving fractions (often 30-50% above EST/BRE-published numbers), and ignore the boring details that determine real outcomes. They exist to generate leads for installers, not to inform households.
We built EcoSaving Hub because retrofit decision-making is genuinely hard, and people deserve numbers they can trust. Our calculators give the conservative answer — the number you would actually achieve in a properly-specified install with a competent installer, not the hypothetical best-case the brochure promises.
Josh Weir is the founder of Weir Digital Media — a UK agency working on programmatic SEO, calculator-led lead generation, sovereign infrastructure, and AI orchestration. EcoSaving Hub is part of a wider network covering UK retrofit, energy, and housing — including Green Living Experts (long-form editorial), Healthy Homes Network (PAS 2035 assessor lookup), Green Home Grants (ECO4 eligibility), and UKFM Energy Hub (installer matching).
The wider thesis is documented at joshweir.uk and the quarterly newsletter The Sovereign Architect.
Working out whether a household actually qualifies for ECO4 or GBIS funding has historically required reading several DESNZ guidance documents and cross-referencing them against the household's income, benefits, EPC rating, and tenancy status. The ECO4 eligibility checker at Green Home Grants compresses that decision tree into a three-question screener that returns a probable-eligibility verdict and a list of the qualifying measures — loft insulation, cavity-wall insulation, room-in-roof insulation, boiler upgrade, air-source heat pump, solar PV — that the household's circumstances unlock under current scheme rules. The checker is updated each time the scheme rules shift, and the underlying eligibility logic is open about which flags trigger which outcomes so the household can see exactly why the verdict came back the way it did. For households that fall outside the strict ECO4 income thresholds, the checker also tests LA Flex (Local Authority Flexibility) pathways — the route by which a Local Authority can declare a household eligible even if it does not meet the standard means-test, on grounds including health vulnerability or fuel-poverty risk. Most households who think they do not qualify actually do via LA Flex.
The consumer-grant routing on this site addresses householder-level retrofit decisions, but the institutional counterpart to the same retrofit-funding-and-specification landscape sits at the FM energy-hub reference , the UK facilities-management procurement playbook at UKFM Group. The hub addresses the equivalent decisions at the scale of multi-site portfolios, covering schools, hospitals, social-housing estates, build-to-rent operations, and commercial estate portfolios. Where this site routes households into funded retrofit packages, the FM hub routes institutional procurers into PAS-2030 compliant works programmes, with the same fabric-and-heating-and-ventilation trade-offs scaled up. Tenants and leaseholders inside institutional estates frequently find that their landlord's retrofit specification falls short of the consumer-grade evidence the household-level grant schemes assume, and the procurement playbook makes the institutional decision-logic transparent so that occupants can advocate for better specifications. The two surfaces are designed to be read together: this site for the household-level grant pathway, the FM hub for the institutional procurement decisions that determine whether tenants in a given estate get a properly-specified package or a value-engineered version that risks the unintended-consequence trap on damp-and-mould outcomes.
EcoSaving Hub does not charge users, does not run advertising, and does not sell user data. We generate qualified leads for the installer-matching service at UKFM Energy Hub, which earns a referral fee from installers who win work. This is the only commercial relationship in the network. We disclose it on every calculator's CTA paragraph.
The calculator results are the same regardless of whether you click through to UKFM. We do not adjust the numbers to drive conversions.
We update calculators on a quarterly cadence — pricing data, grant policy changes, tariff updates, methodology refinements. Major updates are noted in the methodology page changelog. We use semantic versioning on each calculator (v1.0, v1.1, v2.0).
Email [email protected] for: methodology questions, data corrections, partnership enquiries, journalist requests for citations or interviews. We respond within two working days.
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