Retrofit Assessor.

We offer our services to Retrofit Coordinators as a qualified and ECMK accredited Retrofit Assessor. We have over three years experience working as Domestic Energy Assessors so have adapted easily to this new role.

As a qualified Retrofit Assessor we work under the PAS2035: 2019 framework (PAS 2035 Retrofitting dwellings for improved energy efficiency ( We produce reports with a quick turnaround (usually 24 hours from survey). These are always to the high standards expected of a Retrofit Assessor.

Retrofit Assessor
A Retrofit Assessor measuring a window with a Leica Disto Laser similar to the one we use.

As we are based in Great Dunmow in Essex we cover the Essex, Cambridge, Hertfordshire and Outer London areas. As a Retrofit Assessor we get to site at relatively short notice from instruction. The detailed survey (including floorplan, energy assessment, condition sand occupancy reports) is lodged within 24 hours of survey completion.

Our friendly and professional approach combined with three years successful experience as a DEA allows us to deliver a smooth, comprehensive and accurate survey.

Once you have contacted us to book the survey we will contact the homeowner prior to a visit initially to find out the following information:

  • Approximate age of the property.
  • Number and age of extensions and any supporting documentation, e.g building regulation plans.
  • Documents for rooms in the roof.
  • Warranties and certificates, e.g. cavity wall and loft insulation, solar panels, extractor fans, boiler, hot water cylinder.
  • Details about the heating and hot water systems.
  • Last 12 months energy bills – gas and electricity.

We ask that this information is ready for the date and time of the visit as these are crucial in helping us make an accurate assessment of the retrofit needs of your property.

We may also have specific information we will need from the coordinator and will notify the homeowner of this in advance of the visit.

The day of the survey.

We will arrive on time but if we are running behind we will call in advance to update the client.

Currently we follow government Covid-19 guidelines on social distancing and wear face masks, gloves and sanitise prior to and after visiting sites. Click here for more information.

On arrival we hold a short interview with the homeowner about any issues they have experienced with the property over the time of its occupancy, collect and record any information such as that in the list above.

Energy assessment, survey, floor plan and collection of evidence.

This is carried out in a similar way to that which an EPC is carried out only in much more detail as is required of a Retrofit Assessor.

We move through the property carrying out measurements of the rooms, walls, windows, doors and take photographs as evidence of what we observe.

The information collected is recorded in detail on the floorplan and is carried out in all rooms including the roof and loft space internally and externally.

Condition assessment.

As we carry out our measurements we make notes and record information about the condition inside and outside of the building.

Issues such as damp, mould, cracks, leaking gutters and roofs are noted, photographed and recorded for reporting.

Ventilation assessment is important so we pay particular attention bathroom fans, airbricks and windows and check that they are in working order.

Occupancy assessment.

We interview the occupants to determine the level and extent of energy use in the property and any issues they have with this.

We use tact and discretion to find out the information required as well as being objective and explaining the rationale behind the need to collect as much accurate information and data. In this way we build confidence in our clients to show the overall assessment could lead to energy and cost savings.

The final report.

Once we have all the data from the site survey and have collected information from the homeowner we head back to the office to carry the calculations required, upload evidence collected, reconcile energy bills and produce the final report using ECMK’s software.

We lodge the final report on the Data Warehouse and upload a copy to the Retrofit Coordinator as is required.

It is expected that the coordinator will liaise with relevant professionals such as a designer to produce a retrofit plan which is best suited to the client’s home.

Contact us to discuss your Retrofit Assessor requirements and get a quotation.


07867 787672



5 Harmans Yard Great Dunmow Essex CM6 1AS

EPEC Ltd is a private company limited by shares with its registered office at the above address registered with companies house on 2nd July 2018.

Registered company number 11444113