Technical Monitoring Inspections


Technical Monitoring inspections have been the core activity of the company since its inception in 2002.

These on-site inspections are mandated by Ofgem under their guidance for the ECO, to be completed by the obligated energy suppliers, using a third party independent organisation such as Llewellyn Smith.

The technical monitoring inspections cover the compliance, quality and safety aspects of the energy efficiency measure. These are carried out either pre, mid or post installation, dependent on the measuring type.

In addition to the energy suppliers, their supply chain partners are also contracted to carry out technical monitoring inspections, a service that Llewellyn Smith can also supply.



What is ESOS?

ESOS is a piece of EU legislation which requires member states to introduce a mandatory programme of energy audits for ‘large organisations’.

Under ESOS, all large companies must undertake an energy audit conducted or overseen by an approved Lead Assessor once every four years. Audits will include an estimate of total energy consumption, covering buildings, industrial processes and transport, and identify energy saving opportunities. The audit must be signed off by a board-level director before being submitted to the Environment Agency.



Llewellyn Smith is the market leader in providing compliance based services to domestic energy efficiency installations.
These compliance services are an integral part of the Government’s Energy Companies Obligations (ECO) scheme, which are broadly defined as pre and post installation compliance reports.
They are specifically known as Chartered Surveyors Reports, which recommend an energy efficiency measure to a household, and Technical Monitoring, which is a post install quality, compliance and safety inspection. The company offers these services on a national basis in the United Kingdom.
The way we operate, or our culture, is reflected in our vision and core purpose, and through our behavioural-based core values.

Health and Safety Inspections


These inspections are carried out during an installation of an energy efficiency measure. The inspection checks that the installer and their operatives are working in a prescribed manner in line with the risk assessments and method statements.

A number of Llewellyn Smith’s clients have tailor-made inspection regimes which are bespoke. This service provides the client with robust feedback leading to overall improvements in the health and safety methodology.

Customer Satisfaction Survey


Llewellyn Smith are engaged with the householder after the installation of the energy efficiency measure, whilst carrying out technical monitoring inspections.

 At this stage, customer satisfaction surveys are carried out to extract and record the perception of the householder regarding the customer journey but also the performance of the installation company.

 This feedback is used by our clients to measure the performance of their supply chain partners.

Our services are not limited to energy efficiency and are available nationwide.  We are able to create a bespoke solution for you, contact us with your requirements.



To further support our clients, the team at Llewellyn Smith are able to offer tailored training packages.  Areas covered can include Eco – Guidance on Installations and Technical Monitoring Inspections.  However, our training programs can be built to suit your specific requirements.


Get in touch for further information.

External Audits


The inspectors at Llewellyn Smith are all CSCS card holders and are therefore able to provide external audit and relevant check services for all requirements.

If you would like to enquire about any of our services or have a question for one of our team members, please fill in the form below.

Working in partnership with our clients to help them manage their domestic and commercial property portfolios.

Our clients include local authorities, housing associations, owners and managers of domestic and commercial property portfolios, major energy suppliers and energy advice centres. 


The client strategy has been successfully based around securing contracts within ECO with all of the Big 6 Energy Companies. This has provided LSL with an opportunity of not only providing non core services to the energy suppliers but also direct contracts with their associated supply chains. The directors have identified a substantial opportunity to add value to the core services provided to the energy companies.


The Energy Company Obligation (ECO) was introduced in January 2013 to reduce the UK’s energy consumption and support people living in fuel poverty. 
ECO 3 scheme will run from Autumn 2018 until March 2022 and covers the installation of measures like solid wall and cavity wall insulation funded by the Energy Suppliers.

Energy Efficiency

Since 2002, Llewellyn Smith has supported energy utility suppliers in the UK meet their obligations under the Government’s Energy Efficiency Commitment programmes and now the Energy Company Obligation scheme.
Activities include technical monitoring, health and safety compliance and the quality of the energy efficiency measures (EEM) installed in domestic premises and helping our clients drive up standards. All audits and checks provided by Llewellyn Smith are to ensure EEM's meet Ofgem guidance and compliance.

Useful Links


Current Vacancies:

Subcontract Technical Monitoring Inspectors

Due to increasing work volumes, Llewellyn Smith are currently looking for skilled Subcontract Technical Monitoring Inspectors to join our nationwide team in the following areas:


All postcode areas.



DEA qualified individuals with strong industry experience in the following fields:


Heating systems

Cavity wall and Loft insulation

External wall insulation

Internal wall insulation

Room in roof insulation


This is not an exhaustive list of ECO related measures, so if you feel you have other relevant experience please get in touch.  


For more information or to apply direct, please e-mail a CV or brief description of your experience to:



or call: 07936349378

© Llewellyn Smith Ltd 2019 Llewellyn Smith Ltd, Unit 6, Ticehurst Barns, Tostock, Bury St Edmunds, Suffolk, IP30 9PH Tel 01359 302666 Email info@llewellynsmith.co.uk

Registered office: C/O Rfm Fylde Limited, Summerdale Head Dyke Lane, Pilling, Preston, Lancashire, England, PR3 6SJ  VAT No: 758-1733-07. Registered in England: 04361151

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