Nanox Energy helps housing providers, local authorities and contractors deliver PAS 2035-compliant retrofit, from the first energy audit and funding bid through to TrustMark lodgement. Engineer-led coordination means your board gets certainty, your residents get warmer homes, and your funders get full compliance.
Book a free 30-minute scoping call See our project resultsFrom the first heat-loss calculation to final lodgement, we cover the full retrofit lifecycle, so nothing falls between consultants, and nothing puts your funding at risk.
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 →We turn technical plans into fundable applications, structured around the metrics funders score: £/tCO₂e, payback, deliverability and co-benefits.
Learn more →Client-side programme management at scale: procurement support, quality-assurance regimes, site inspections, resident liaison and progress reporting.
Learn more →External 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.
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