PAS 2035/2030:2019

Explore PAS 2035/2030:2019 standards for energy retrofits in buildings. Achieve compliance and enhance energy efficiency with our expert insights.

Sponsored by the UK Government’s Department for Business, Energy and Industrial Strategy (BEIS), this PAS is a key document in a framework of new and existing standards on how to conduct effective energy retrofits of existing buildings. PAS 2035 covers how to assess dwellings for retrofit, identify improvement options, design and specify Energy Efficiency Measures (EEM) and monitor retrofit projects. Meanwhile PAS 2030, which was redeveloped in conjunction with PAS 2035, covers the installation, commissioning and handover of retrofit projects. Organizations which trade using the Trustmark Government endorsed Quality scheme are required to comply with PAS 2035.

Who is this PAS for?

All those engaged in the management, design and installation of energy efficiency measures in existing buildings including:

  • Retrofit Advisors, Assessors, Co-ordinators, Designers, Evaluators and Installers working in
  • Commercial building contractors
  • Specialist installers of retrofit measures
  • Local SME builders and independent tradespeople working alone or in small teams
  • Certification Bodies

Why should you use this PAS?

It specifies requirements for the retrofit of dwellings, including:

  • Assessment of dwellings for retrofit
  • Identification and evaluation of improvement options (Energy Efficiency Measures, or EEMs)
  • Design and specification of EEMs (whether individual measures or packages of multiple measures)
  • Monitoring and evaluation of retrofit projects
  • Installation, commissioning and handover

The PAS also covers a comprehensive range of EEMs which are intended to improve, among other things, insulation of building fabric elements and air tightness; and provide, among other things, efficient heating and cooling systems with smart controls, including systems using low or zero carbon (LZC) technologies.

In addition to setting out requirements of all of the above, PAS 2035 also specifies requirements for advising building occupants about improvement options appropriate to their homes, and the efficient and appropriate use and maintenance of their retrofitted homes as well as for monitoring and evaluating retrofit projects when appropriate, and feeding back lessons learned to all parts of the supply chain, including the building occupants.

This PAS covers work that is initiated, procured, funded and delivered in a variety of ways including:

  • Retrofit programmes promoted and/or funded by national or local government schemes e.g. the Energy Company Obligation (ECO)
  • Retrofit programmes initiated and/or funded by landlords, including social housing organizations, private landlords in the domestic sector and commercial property portfolio holders
  • Retrofit of individual buildings by their owners and/or occupants, including both domestic and commercial owner-occupiers
  • Retrofit that is integrated with and forms part of broader repairs, maintenance and improvement (RMI) activity related to individual buildings or building stocks

NOTE 1: Many aspects of domestic retrofit are covered by existing standards. Where appropriate, those standards are referred to in this PAS, and compliance with the standards referred to is thereby a requirement of this PAS.

NOTE 2: This PAS does not apply to maintenance or repair of any element of an existing dwelling, or system installed in it, which does not involve improvement of the energy performance or ventilation of the dwelling, or a reduction of the carbon dioxide emissions associated with energy use in the dwelling. Nor does this PAS apply to “like-for-like” replacement of damaged or worn out elements or systems that do not involve improvement of the energy performance or ventilation of the dwelling, or a reduction of the carbon dioxide emissions associated with energy use in the dwelling.

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A Step-by-Step Guide

Discover how we guide you through every stage of achieving ISO certification. From initial gap analysis to ongoing support, our structured process ensures you meet and maintain the highest standards.
1

The Gap Analysis

GAP Analysis compares actual business performance with a quality management system’s potential or desired performance. It will identify the responsible and relevant persons within the organisation and the company’s operational process flows. It will identify the gaps required to be satisfied by the ISO Standard.

Once Compliant understands the documentation your business has in place, we will fill all the gaps. We know precisely what is required to get you certified to ISO stress-free and first time.

We can provide a commitment letter from ourselves and the certification company to say you are on the ISO journey, which helps you with tenders, PQQ and clients.

2

Documentation And Folder Structure

Develop or enhance an existing management folder structure for document retrieval and versioning. Implement the Integrated Management System (IMS), ensuring complete synergy with the existing system, or create a new and more robust version. Identify all interested parties, legislation, risk assessments, plans, process flows, and policies. Identify the right UKAS-approved certification company.

As we are certified, how can we not get your business certified?

We provide a comprehensive management system made up of populated documents. We know what the auditor will ask for before they ask. We collate these documents in advance of the audit.

3

Stage One Assessment

Stage 2 certification audit. This can be completed by the certification company remotely, on-site, or in a blended format. A site visit to one of your clients may be necessary. Certification achieved.

We ensure you have a robust management system of populated documentation and full-on-the-day audit support to liaise with the auditors and represent your business.

If anything is required on audit day, we collaborate to sort out the audit, ensuring a smooth process for all concerned.

Once you have been advised by the auditor that you are being recommended for certification, we collate all the relevant final pieces of information and liaise with the certification body to get your certificates. We then promote your business by case study to announce to all your peer ISO businesses that you are certified.

4

Internal Audit

Internal Audit. This is the sanity check before your stage 2 certification audit. A complete check on all documentation and ensure process flows are accurate, and a comprehensive understanding of the IMS to ensure the business meets the standard’s requirements. Check that all controls are implemented, including KPI maintenance and corrective actions. Continuous improvement. Meetings with the Management team to ensure compliance and understanding of the requirements in preparation for the Stage 2 on-site audit. There will be online team meetings, emails, and, when required, on-site visits to ensure you are audit-ready.

We take the stress out of certification.

5

Stage Two Assessment

Stage 2 certification audit. This could be completed by the certification company remotely, on-site, or even blended. A site visit to one of your clients may be necessary. Certification achieved.

We ensure you have a robust management system of populated documentation and full-on-the-day audit support to liaise with the auditors and represent your business.

If anything is required on audit day, we collaboratively sort the audit to ensure a smooth process for all concerned.

Once you have been advised by the auditor that you are being recommended for certification, we collate all the relevant final pieces of information and liaise with the certification body to get your certificates. We then promote your business by case study to announce to all your peer ISO businesses that you are certified.

6

Ongoing Support and Improvement

Compliant Ltd offers comprehensive ongoing support and continuous improvement.

Once certified, your business must retain the certification. This can be very timely and costly to a company. We take all of that away and make it.

Periodic maintenance of IMS to ensure all controls continue to be implemented, as well as maintaining a risk-based internal audit to include an audit of controls, complete management reviews, assess KPIs and corrective actions, and continually seek improvement.

See our comprehensive expert ongoing support information

1

The Gap Analysis

Identify gaps in your current system compared to the desired standards.

2

Implementation Support

Provide guidance to amend and implement necessary changes to meet standards

3

Stage One Assessment

Conduct a preliminary assessment to ensure readiness for certification.

4

Internal Audit

Perform an internal audit to verify compliance and prepare for final assessment.

5

Stage Two Assessment

Carry out the main certification audit to ensure all standards are met.

6

Ongoing Support and Improvement

Offer continuous support to maintain compliance and drive improvements.

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Our dedicated process and post certification

Discover our post-certification support, including spreading your ISO certification payments and how the ongoing support can benefit your business.

Research & Analysis

We tailor standards to fit your business needs, helping you implement a documented management system. Our goal is to ensure compliance with your selected standard(s).

Assessment

We start with a document review to verify your system’s existence. Next, we conduct onsite assessments to ensure your operations align with your documented system.

Certification

If any issues are found, we’ll provide a detailed report and give you the chance to address them. Once everything is resolved, we issue your certificates and complete your registration with the applicable schemes.

"The best decision we have made in 2025 so far has been to work with Compliant."
Meglio Ltd
Michael Commissar
"Compliant have been intrinsic to Iplicit reaching this stage, with unwavering support and of course applied with their own knowledge and experience, which has been invaluable."
Iplicit Ltd
Ken Russell
"We appreciate all your help and guidance it’s been a pleasure and look forward to meeting the rest of the team."
Hydraquip
Barry Thompson
"Thanks again for Donna's support for this audit, and thanks also Ryan for your help since joining the team. It is an amazing result for us, we couldn’t have done it without you. I wouldn't hesitate to recommend to others."
Pinnacle Precision Engineering
Ben Rossi
We are happy with the full process from start to finish, Compliant are Efficient, friendly and have extensive knowledge in what they do and would recommend compliant to any other company looking to achieve ISO Certification
Core Security
Lynne
Richard said the process from start to finish was a delight and so smooth and stress free.
Blue Telecom
Richard
We continued using Compliant because we received excellent support and customer service throughout the whole process. Team meetings were arranged well in advance, and their help and advice were given as and when needed.
Speedings
Linda
In the lead up to our audits, everything was explained to us clearly which meant that we were thoroughly prepared. If we had any questions, even a few which we thought were quite silly, we would send these across to Mark and he would get back to us promptly every time.’
Sir Joseph Isherwood Ltd
Paul Dixon
Casey finished by saying, ‘Put simply, we love working with the Compliant team, the process flows exactly as it should and we’re confident that when the audits come around, we have everything in place with no need to panic.
CK Beckett
Casey
 It has been super easy with Mark and his team guiding us throughout the year. It feels like you can use Compliant as much or as little as you want. We are keen to continually evolve our ISMS and Compliant are there to help guide and support us through the process.
Iplicit
Ed
Compliant made it easy for my team to get on with their day jobs while working with us in the background to manage the audit and achieve certification.
Boost Education
Laura Penfold
Big thanks to Mark and the team for making the process so simple.
Zaltek Digital
Mark Middleton - Managing Director
Compliant delivered carried out a superb job on our management system and helping achieving certification to UKAS ISO 9001 and the NHSS 16 highways sector scheme – thanks
M A Stanton and Sons
Andy Stanton - Director
Compliant have been great from day one, very thorough, very knowledgeable and helpful. I would definitely recommend them.
ARMAH Switchgear
Paul Croft
Compliant delivered on time and in budget all of our UKAS ISO 9001, 14001 and 45001 international certifications. They even helped us attain a grant towards the overall cost of implementation. Good job well done and efficiently.
O'Brien's Specialist Crane Division
Callum O'Brien - Director
The Compliant team were asked to support us on all aspects of health and safety and subsequently proved to be an immense help towards the recertification of all of our UKAS ISO certifications
O'Brien's Demolition
Michael O'Brien
Wow, thank you very much for all of Compliant's help, we could not have got here without your great contribution
Chapter Eight Traffic Solutions
Ejikeme Ibe
We found Compliant to be an extremely efficient business in both the financial and deliverable sense of the word. They helped us achieve UKAS ISO 9001 and 14001 with the NHSS 12 sector scheme in quick time and at an excellent price – thank you
Contract Options
Malcom Stock - Director
"The best decision we have made in 2025 so far has been to work with Compliant."
Meglio Ltd
Michael Commissar
"Compliant have been intrinsic to Iplicit reaching this stage, with unwavering support and of course applied with their own knowledge and experience, which has been invaluable."
Iplicit Ltd
Ken Russell
"We appreciate all your help and guidance it’s been a pleasure and look forward to meeting the rest of the team."
Hydraquip
Barry Thompson
"Thanks again for Donna's support for this audit, and thanks also Ryan for your help since joining the team. It is an amazing result for us, we couldn’t have done it without you. I wouldn't hesitate to recommend to others."
Pinnacle Precision Engineering
Ben Rossi
We are happy with the full process from start to finish, Compliant are Efficient, friendly and have extensive knowledge in what they do and would recommend compliant to any other company looking to achieve ISO Certification
Core Security
Lynne
Richard said the process from start to finish was a delight and so smooth and stress free.
Blue Telecom
Richard
We continued using Compliant because we received excellent support and customer service throughout the whole process. Team meetings were arranged well in advance, and their help and advice were given as and when needed.
Speedings
Linda
In the lead up to our audits, everything was explained to us clearly which meant that we were thoroughly prepared. If we had any questions, even a few which we thought were quite silly, we would send these across to Mark and he would get back to us promptly every time.’
Sir Joseph Isherwood Ltd
Paul Dixon
Casey finished by saying, ‘Put simply, we love working with the Compliant team, the process flows exactly as it should and we’re confident that when the audits come around, we have everything in place with no need to panic.
CK Beckett
Casey
 It has been super easy with Mark and his team guiding us throughout the year. It feels like you can use Compliant as much or as little as you want. We are keen to continually evolve our ISMS and Compliant are there to help guide and support us through the process.
Iplicit
Ed
Compliant made it easy for my team to get on with their day jobs while working with us in the background to manage the audit and achieve certification.
Boost Education
Laura Penfold
Big thanks to Mark and the team for making the process so simple.
Zaltek Digital
Mark Middleton - Managing Director
Compliant delivered carried out a superb job on our management system and helping achieving certification to UKAS ISO 9001 and the NHSS 16 highways sector scheme – thanks
M A Stanton and Sons
Andy Stanton - Director
Compliant have been great from day one, very thorough, very knowledgeable and helpful. I would definitely recommend them.
ARMAH Switchgear
Paul Croft
Compliant delivered on time and in budget all of our UKAS ISO 9001, 14001 and 45001 international certifications. They even helped us attain a grant towards the overall cost of implementation. Good job well done and efficiently.
O'Brien's Specialist Crane Division
Callum O'Brien - Director
The Compliant team were asked to support us on all aspects of health and safety and subsequently proved to be an immense help towards the recertification of all of our UKAS ISO certifications
O'Brien's Demolition
Michael O'Brien
Wow, thank you very much for all of Compliant's help, we could not have got here without your great contribution
Chapter Eight Traffic Solutions
Ejikeme Ibe
We found Compliant to be an extremely efficient business in both the financial and deliverable sense of the word. They helped us achieve UKAS ISO 9001 and 14001 with the NHSS 12 sector scheme in quick time and at an excellent price – thank you
Contract Options
Malcom Stock - Director

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