Most retrofit programmes do not fail on ambition, they fail on evidence. NanoXEnergy turns your stock data, EPC records, board approvals and resident need into an eligibility case a funder can score highly, then coordinates the delivery that keeps the money safe. Warm Homes, ECO4, PSDS and borough climate funds, engineer-led from first bid to final TrustMark lodgement.
Book a free 30-minute scoping call See our project resultsFunding is where retrofit programmes are won or lost, so that is where we start. From the eligibility case through to final lodgement, we cover the full retrofit lifecycle, so nothing falls between consultants, and nothing puts your grant at risk.
Our lead service. Rule-by-rule eligibility assessment against the official scheme guidance, evidence-gap analysis, and a prioritised improvement plan that lifts your application from eligible to competitive before you submit.
Learn more →End-to-end coordination of domestic retrofit in line with PAS 2035: risk pathways, whole-dwelling assessment, improvement plans, design coordination and TrustMark lodgement.
Learn more →Gap analysis, audit-readiness reviews, specification checks and defect investigation for contractors, housing associations and installers who need PAS 2035:2023 confidence.
Learn more →Investment-grade energy surveys: metered consumption analysis, U-value and heat-loss calculation, and a costed, ranked table of measures ready for board approval.
Learn more →Site and portfolio roadmaps that sequence fabric, heating and renewables correctly: heat pumps sized against the improved fabric, phased pathways to net zero.
Learn more →Client-side programme management at scale: procurement support, quality-assurance regimes, site inspections, resident liaison and progress reporting.
Learn more →Funders do not reject applications because the retrofit was a bad idea. They reject them because an EPC record was out of date, because co-funding was not formally approved, because a claim in the narrative had no named document behind it. Eligibility only means you may apply. Winning is a separate exercise, and it is an evidence exercise.
We test your programme rule by rule against the official scheme guidance, classify every requirement as pass, pass with action or human review, and tie each one to a named document in an evidence register. What comes back is not an opinion, it is a list: the gaps, the risks, and the order to fix them in before you submit.
The value: on a multi-million-pound bid, finding one missing approval or one stale EPC batch before submission is worth many times the cost of the review.
See two worked eligibility assessmentsExternal wall insulation on solid-wall housing in Exposure Zone 4 (very severe) is one of the highest-risk retrofit measures in the UK. Across a 270-property scheme, recurring defects were putting performance, durability and compliance at risk: render discolouration, thermal bridging, cold spots around openings, and water-ingress pathways at sills and flashings.
We carried out a systematic defect review across the portfolio, benchmarked every failure class against INCA best practice and the system designer's installation requirements, and traced consequences through to resident impact: heat loss, condensation risk and mould.
The value: on a 270-home scheme, preventing even a small percentage of installations from needing remedial work saves multiples of the coordination fee, and protects the guarantee, the funding compliance and the residents.
Read the full case studySix site decarbonisation surveys completed under the LASER Zero Carbon Fund programme for the London Borough of Hammersmith & Fulham (2024–2025), schools, theatres, sports pavilions and community buildings.
Whole-site plan combining fabric-first measures with heat-pump conversion and solar PV, 97 tCO₂e and 538,700 kWh saved per year.
1,512 m² of internal wall insulation, glazing that cut glazed-surface heat loss by 28%, LED lighting, heat pump and district-heating assessment.
A tightly-scoped, high-value intervention: air-to-air heat pump saving 12,000 kWh/yr, proof that decarbonisation doesn't always need major capital works.
For domestic retrofit this maps directly onto PAS 2035; for non-domestic sites we apply the same rigour through the survey-to-delivery methodology proven on the LASER ZCF programme.
Clear objectives, risk pathway and scope. Funding fit confirmed early.
Condition, occupancy, ventilation and heritage constraints captured; metered data analysed.
Costed, ranked measures with kWh, £, tCO₂e, payback and £/tCO₂e.
Correctly sequenced fabric-first roadmap: no lock-in, no unintended consequences.
Details benchmarked against system-designer and INCA guidance.
Site inspections, toolbox talks, mid-install checks, defect prevention.
TrustMark lodgement, monitoring plan, resident guidance and evaluation.
Nanox Energy is led by Abd Alrahman, a Level 5 Retrofit Coordinator with a mechanical engineering background and energy & decarbonisation auditing expertise.
Every measure we recommend is grounded in what we have surveyed, calculated, specified and seen built, from investment-grade decarbonisation reports for a London borough to portfolio-scale defect analysis in one of the UK's most demanding exposure zones.
A typical first step is a free 30-minute scoping call, followed by a fixed-fee pilot survey or compliance review, so you can judge the quality of our work before committing to a programme. Email us at info@nanoxenergy.co.uk or use the form.
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