PAS 2035 Compliance in London
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Energy retrofits aren’t just about installing insulation or heat pumps — they’re about doing it right.
At Bigness Group, every retrofit project follows the PAS 2035 standard, the UK’s official quality framework for domestic energy-efficiency improvements.
We coordinate qualified Retrofit Coordinators, Assessors, Designers, and Installers to ensure that every measure we deliver is safe, efficient, and fully compliant.
From initial assessment to post-installation evaluation, we give clients the confidence that their property meets national retrofit regulations and performs as promised.
What PAS 2035 Means
PAS 2035 is the British Standards Institution’s specification for how energy-efficiency retrofits must be managed under the TrustMark scheme.
It defines a “whole-house” approach — assessing how insulation, ventilation, heating, and moisture interact to avoid common retrofit failures.
For clients, PAS 2035 compliance means better results, fewer defects, and eligibility for government-backed funding or incentives.
Bigness Group applies the standard to every domestic retrofit we deliver, ensuring complete traceability and accountability from start to finish.
Our PAS 2035 Compliant Services
We manage the full retrofit pathway in line with PAS 2035 requirements:
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Retrofit Assessment – Detailed energy, condition, and occupancy surveys to identify improvement opportunities.
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Retrofit Coordination – Certified project management ensuring all parties follow the compliance plan.
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Design & Specification – Whole-building solutions developed by qualified Retrofit Designers.
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Installation & Quality Assurance – Measures carried out by TrustMark-registered installers.
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Testing & Evaluation – Post-work checks, air-tightness tests, and photographic evidence for certification.
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Handover & Monitoring – Final documentation, user guidance, and performance tracking for long-term efficiency.
Each stage is recorded through the TrustMark Data Warehouse, guaranteeing transparency and regulatory approval.
Our Process
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Initial Survey & Scope – Identify target EPC rating and applicable measures.
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Assessment & Modelling – Energy data analysed using approved software to build the improvement pathway.
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Design Review & Risk Assessment – Mitigate condensation, ventilation, and structural risks.
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Installation & Supervision – Qualified teams execute works under Retrofit Coordinator oversight.
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Post-Evaluation & Sign-Off – Verification reports and TrustMark registration complete the process.
This workflow ensures your retrofit not only performs but also passes every compliance audit.
Why Choose Bigness Group
Bigness Group combines construction experience with certified retrofit expertise — giving clients one accountable partner for quality and compliance.
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Fully qualified Retrofit Coordinators (PAS 2035) and TrustMark-registered Installers
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Integration of structural, mechanical, and sustainability disciplines
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Transparent cost planning and evidence-based reporting
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Eligibility support for ECO4, SHDF, and other funding schemes
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Proven track record across London housing and private retrofit projects
Compliance isn’t paperwork to us — it’s the standard we build by.
Frequently Asked Questions
Q: Is PAS 2035 mandatory?
Yes, it’s required for all publicly or government-funded domestic retrofit projects and recommended for all others seeking guaranteed quality.
Q: Do you provide Retrofit Coordinator services?
Absolutely. We supply certified Coordinators to oversee assessment, design, and delivery.
Q: What properties qualify for PAS 2035 retrofits?
Any domestic building, from single homes to housing blocks, can follow the framework.
Q: How does PAS 2035 help homeowners?
It reduces performance gaps, prevents damp or ventilation issues, and improves energy ratings with verified results.
Q: Can you handle documentation and TrustMark registration?
Yes — we manage the entire compliance file and submit all evidence for certification.
Recent PAS 2035 Projects
From council-led insulation schemes to private retrofit upgrades, our recent work demonstrates the effectiveness of a structured, compliant approach. Each project achieved measurable reductions in energy use and improved occupant comfort — proof that regulation and innovation can work together.
PAS 2035 Compliance Across London
We deliver fully compliant retrofit services throughout Greater London, working with local authorities, housing associations, and private landlords. Our teams understand borough-specific sustainability targets and planning rules, ensuring smooth coordination and fast approval on every project. With Bigness Group, compliance isn’t an obstacle — it’s your pathway to performance and funding success.
Barking and Dagenham / Barnet / Bexley / Brent / Bromley / Camden / Croydon / Ealing / Enfield / Greenwich / Hackney / Hammersmith and Fulham / Haringey / Harrow / Havering / Hillingdon / Hounslow / Islington / Kensington and Chelsea / Kingston upon Thames / Lambeth / Lewisham / Merton / Newham / Redbridge / Richmond upon Thames / Southwark / Sutton / Tower Hamlets / Waltham Forest / Wandsworth / Westminster