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Borough of Dartford EWI and Associated Works

Low Carbon Exchange were appointed by Dartford Borough Council to carry out EWI retrofit and associated works, we have delivered works to 537 properties across the borough over the 6 year period. The works resulted in significant improvements to the properties’ EPC rating and subsequently, significant reduction in energy bills and improvement to the residents’ comfortability in their home.

Location: Borough of Dartford
Duration: 6 Years (2016 – 2022)
Value: £6.5 Million
Expertise: EWI & Associated Works
Sector: Local Authority Housing

Following initial meetings and technical reports, Dartford Borough Council decided to undertake External Wall Insulation (EWI), and associated energy efficiency and building works for 537 properties over the course of 6 years. Applying these measures to properties that were considered the highest risk of fuel poverty, and the least thermally and energy efficient in their stock. This phase of works helped Dartford Borough Council to improve the energy efficiency (EPC and SAP ratings) of these properties, in line with new government legislation for fuel poverty targets, and assist their tenants to significantly reducing their fuel bills.

What the Client Wanted

The aim of the works was to improve the thermal performance of the fabric of all of the homes in the programme, reducing the potential of cold bridging areas, condensation, and resulting damp & mould concerns. Enabling the provision of affordable warmth and heating for tenants, assisting with their education and the behavioural changes needed to further reduce their bills.

Surveys showed the properties included in the works were an EPC rating of D-F. In an effort to meet the new government targets Dartford Borough Council sought to increase the EPC rating, and therefore reduce the carbon footprint, of their stock. EPC surveys were to be carried out post-works to determine the new ratings of the properties.

How we Helped

To achieve Dartford Borough Councils goals, we conducted Initial sample surveying for technical and funding eligibility, obtaining ECO funding subject to associated scheme compliance. Following this we conducted detailed surveying and carried out enabling works on the properties, which included the erection of scaffold. It was also identified that the renewal of some roofline verge systems, fascia, soffits, guttering and sloping ceiling insulation were required as part of the associated works.

EWI utilising Rockwool flame retardant materials was used to insulate the solid wall elements of the building fabric to a minimum 0.28 “U Value”. We also fitted High density insulation to properties where high ground levels were an issue.

In keeping with the surrounding housing stock, a brick slip system was used for the external fabric. UPVC windowsills were renewed, bitumen emulsion paint was applied to plinths and Gas flue and supply pipes were replaced and altered as required. BT line brackets and waste pipework were extended to allow for the new fabric and insulation. We also replaced Soil and vent pipes.

We visited each property and educated residents, answering any questions they may have and informing them of behavioural changes that can contribute to further reducing their energy bills. Additionally, we provided each resident with a bespoke Resident Handover Booklet containing information on all the systems installed at their property.

Key Achievements

  • The properties EPC rating has improved from D-F to high C.

  • The works resulted in £10,799,340 fuel bill savings.
  • The works resulted in 19,332,000 kg of CO2 savings.


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Low Carbon Exchange Ltd
61 Gazelle Road
North Somerset
BS24 9ES

0117 359 1410

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