Skip to content

How it works

How does our one-stop retrofit service work?

The Cosy Homes Oxfordshire service centres on a whole house approach to home retrofit, providing a full, one-stop-shop service to help you increase the energy efficiency of your home.

Once you register your home you will be looked after by our dedicated Retrofit Coordinator team. Scroll down this page for an outline of the full process, where costs come in, and the different routes to get started.

Step 1: Home assessment

The first step is for one of our Retrofit Assessors will come and assess your whole house to find out everything we need to know about your property.

Step 2: Whole House Plan

Your Retrofit Coordinator will then use this information to develop a bespoke Whole House Plan for your home, detailing all the measures you could take to make your home as energy efficient as possible as a whole, with recommendations on the most cost effective and impactful measures to take forward, and in which order.

“The Whole House Plan provided a holistic view of where we could make energy saving improvements. The written report is well structured, giving a good overview summary and then going into detail for the different options – including information about carbon footprint.  Excellent value for money, and I have already recommended Cosy Homes Oxfordshire to several other people!”

Dr Heather Comina, Cosy Homes Oxfordshire client

What costs are involved?

Every home is different, so the cost of a whole house retrofit can vary greatly based on the type of home and the measures needed. There are costs associated with a few stages of our Cosy Homes Oxfordshire process, outlined below:

Plan builder – free

Using our Plan Builder to explore the possibility of home retrofit for your home is completely free and will give you an idea of the installation costs as well as the potential cost and carbon savings.

Home Assessment and Whole House Plan – £250 – £475

A Home Assessment and Whole House Plan costs:

  • 1-2 bed home – £250 (inc. VAT)
  • 3-4 bed home – £475 (inc. VAT)
  • 5+ bed home – price on request*

This cost covers the time needed to assess your home, and for the Retrofit Coordinator to create your bespoke Plan.

*This is because we’ve found that homes with more than 5 bedrooms often also have more complex layouts e.g. multiple buildings, so we’ll need to find out more about your home first.


Client Service Agreement – £500 to £1500

After you’ve reviewed your Whole House Plan with your Retrofit Coordinator and decided which measures to progress with, you will be sent a Client Services Agreement (CSA). The CSA outlines any additional costs before work can begin on your retrofit project.

This will likely include a Building Performance Requirement (BPR) and any additional technical reports to provide detailed quotes. Every home is unique and the cost will vary depending on the home and the measures needed, but a typical project will have costs of £500-£1500 (+VAT). Our team are always happy to talk you through your CSA to ensure you understand any costs included.

This stage is crucial for our whole house retrofit approach. We typically work on complex home retrofits where there are multiple measures in play. With these complicated projects it’s very important that contractors have a detailed understanding of the building to avoid any issues such as thermal bridging, ventilation, or damp.

Delivery of retrofit work – 5% project charge

If you go ahead with your home retrofit, there will be a 5% project charge for our service, and this cost will also be outlined in your CSA.

The 5% project fees cover the costs of your Retrofit Coordinator to;

  • Facilitate any contract documents that are required between yourself and the contractor.
  • Coordinate the retrofit measures with the contractors to ensure they are appropriately sequenced.
  • Oversee the works to ensure the contractor conducts what they have promised. We will be on hand to manage any issues or conflicts that may arise.
  • Sign off the work and give you the all-clear to pay the contractor.

The cost of delivering a home retrofit can vary massively from home to home depending on factors such as the size and age of the home. Use our free online Plan Builder to get an idea of current costs.

Our process in full

It’s then up to you to choose which measures you go ahead with, with the support and advice of your Retrofit Coordinator. We manage the delivery of the work, find trusted contractors and check the quality of delivery once complete.

How to get started

The first step is to use the Cosy Home Plan Builder to build a draft home retrofit plan based on existing data about your home and your budget and priorities.

You can then submit your plan through the Plan Builder, which will send it to our team – and we’ll be in touch to discuss next steps and book in your home assessment and Whole House Plan.

“We had wanted to improve the thermal efficiency of our home to reduce our carbon footprint, and finding this dedicated service that provided great expertise, made recommendations in the Whole House Plan, and are able to organise and supervise contractors was brilliant.”

Andy Pedley, Cosy Homes Oxfordshire Client

© Cosy Homes Oxfordshire 2022 All rights reserved
For a better viewing experience we recommend you upgrade your browser.