Retrofit

Not all thermal upgrades are equal. Work with us to discover where best to spend your budget and make a real impact.

When embarking on a renovation project, there is a lot to consider. Balancing aspirations, budget and the refurbishment needs of the property is not a simple task.


Our dedicated refurbishment offering allows you to clearly identify and prioritise different areas of work to and best understand the cost and carbon impacts of the choices you’ll make at each stage; allowing you to mitigate risk and make confident decisions.

Existing Property Heat Loss Measurements


This service is for existing properties that are embarking on their sustainability journey.


It may be that you are considering thermal improvements and want to best understand your starting point. It may also be that you’d prefer to avoid thermal improvements and would like to understand if a heat pump is feasible at your property without the costs and upheaval of insulation upgrades.

During a site visit, our engineers will test the air leakage, and wall u-values, set up monitoring devices, and take meter readings to allow us to establish the properties heat transfer coefficient (HTC) and peak heat load (over a three-week period).


For this service to be effective external temperatures need to be c.10°C or lower.

Building Fabric Risk Assessment


Ahead of retrofit projects, it’s important to identify & plan to mitigate against the potential risks associated with the building’s fabric—walls, floors, roofs, windows, and doors—before implementing energy-efficient upgrades.


Our survey will identify the existing fabric build-ups for accurate heat loss modelling later on and provide a prioritised pre-retrofit recommendations report.

Key Considerations in Building Fabric Risk Assessments Include:

Moisture Management

Evaluating risks related to condensation, dampness, and mould that could affect both new and existing building elements.

Thermal Bridging

Identifying and addressing areas where heat transfer might bypass insulation, reducing overall efficiency and create an increased risk of mould and damp.

Ventilation

Ensuring that retrofitting measures do not adversely affect air quality and ventilation, which are crucial for occupant health and comfort.

Pre-Retrofit Maintenance Works

A prioritised list of maintenance work which would need to take place before thermal upgrades.

Heritage Risk Assessment


Due to their age and listed status, some properties require a little more TLC.


This package includes heritage factors into the consideration on the pre-retrofit survey recommendations and is suitable for properties built before 1920. The report can be used to support your Architect in their discussions with English Heritage.


Thermal Imaging


A thermal imaging survey is a useful addition to highlight areas of air ingress, thermal bridging and risk of interstitial condensation and mould growth. It is also very useful to help understand if insulation has been installed correctly or if cavity wall insulation has failed.


This is most effective when a property is heated and the temperature outside is lower than c.10°C, we would only advise under these conditions.

Insulation Optimisation


The intelligent way to approach any building design project is to focus initially on what improvements can be made to the fabric.


This can be challenging because not all parts of the building fabric are created equal. To spend limited project budgets wisely, it’s worth investigating what improvements make the greatest impact.


We can help you prioritise improvements using our in-house software to better understand the relative cost benefits. Where practical, the team will determine insulation levels in every facet of the building, including walls, roofing, and flooring, as well as potential window upgrades, to compare capital costs against running cost savings.

Post Occupancy Heat Loss Measurements


This service is for new build properties or newly completed retrofits.


We know that there is often a shortfall between what is designed and what is achieved from a building fabric performance standpoint. Our comprehensive survey allows you to assess the as-built performance of the building fabric to best understand if the project goals have been met.


During a site visit our engineers will test air leakage, wall u-values, set up monitoring devices and take meter readings to allow us to establish the properties heat transfer coefficient (HTC) and peak heat load (over a three-week period).


For this service to be effective external temperatures need to be c.10°C or lower.

To discuss your low-energy and sustainable retrofit project, please don't hesitate to get in touch

Latest Insights

by Doug Johnson 9 December 2025
As the year draws to a close, the Mesh team has been out in the community helping to spread some much-needed festive cheer. From fundraising in Santa suits, food donations for local families and donating warm clothing for those who need it most, the team has embraced the spirit of giving in the run-up to Christmas. Running for a Cause: The Guildford Santa Fun Run Despite the wet weather, members of the Mesh team braved the elements for the Guildford Santa Fun Run, raising money for the children’s charity, Challengers. Joined by Jacqueline Smith from our client TALO, Mesh’s Founder and Director Doug Johnson, along with Maria Fiore and Ilianna Filippopoulou, completed the festive run in full Santa attire. The team also reached their fundraising target, helping Challengers continue its exceptional work in supporting disabled children and young people in the community. Supporting Local Families in Need through the Lions Christmas Food Parcel Appeal For another year, Mesh proudly supported the Lions’ Christmas Food Parcel Appeal, helping to provide food parcels to individuals and families in need over the festive period. Thanks to the generosity of the Mesh team and many local businesses and residents, a huge selection of donated goods is now being sorted and delivered by the incredible volunteers at Lions Farnham. This annual initiative continues to be a meaningful way for us to support vulnerable members of our local community during what can be a really challenging time of year. The Coats for All Initiative Mesh has also taken part in the Coats for All initiative, a brilliant scheme that distributes warm, good-quality coats to anyone who needs one. Through the generosity of colleagues, friends, and partners who donated pre-loved coats in excellent condition, we are helping to ensure that more people can stay warm this winter. Many local libraries are acting as collection points, making this a simple but impactful way for people to support others in the colder months — and we are proud to play our part. According to Mesh Founder and Director, Doug Johnson: “Community sits at the heart of Mesh, and it’s been inspiring to see our team give their time, energy and generosity to support such worthwhile causes - not just this Christmas but throughout the year. Whether running through the rain, collecting food, or fundraising for local charities, everyone has contributed to making a real difference — and I couldn’t be prouder.” At Mesh, we believe that small acts of kindness create meaningful impact. A heartfelt thank you to everyone who donated, participated, or volunteered this year. We look forward to continuing our community support into 2026 and beyond."
9 December 2025
As the year draws to a close, the Mesh team has been out in the community helping to spread some much-needed festive cheer. From fundraising in Santa suits, food donations for local families and donating warm clothing for those who need it most, the team has embraced the spirit of giving in the run-up to Christmas. Running for a Cause: The Guildford Santa Fun Run Despite the wet weather, members of the Mesh team braved the elements for the Guildford Santa Fun Run, raising money for the children’s charity, Challengers. Joined by Jacqueline Smith from our client TALO, Mesh’s Founder and Director Doug Johnson, along with Maria Fiore and Ilianna Filippopoulou, completed the festive run in full Santa attire. The team also reached their fundraising target, helping Challengers continue its exceptional work in supporting disabled children and young people in the community. Supporting Local Families in Need through the Lions Christmas Food Parcel Appeal For another year, Mesh proudly supported the Lions’ Christmas Food Parcel Appeal, helping to provide food parcels to individuals and families in need over the festive period. Thanks to the generosity of the Mesh team and many local businesses and residents, a huge selection of donated goods is now being sorted and delivered by the incredible volunteers at Lions Farnham. This annual initiative continues to be a meaningful way for us to support vulnerable members of our local community during what can be a challenging time of year. The Coats for All Initiative Mesh has also taken part in the Coats for All initiative, a brilliant scheme that distributes warm, good-quality coats to anyone who needs one. Through the generosity of colleagues, friends, and partners who donated pre-loved coats in excellent condition, we are helping ensure that more people can stay warm this winter. Many local libraries are acting as collection points, making this a simple but impactful way for people to support others in the colder months — and we are proud to play our part. According to Mesh Founder and Director, Doug Johnson: “Community sits at the heart of Mesh, and it’s been inspiring to see our team give their time, energy and generosity to support such worthwhile causes - not just this Christmas but throughout the year. Whether running through the rain, collecting food, or fundraising for local charities, everyone has contributed to making a real difference — and I couldn’t be prouder.” At Mesh, we believe that small acts of kindness create meaningful impact. A heartfelt thank you to everyone who donated, participated, or volunteered this year. We look forward to continuing our community support into 2026 and beyond."
Building performance specialist Mesh looks at the Future Homes Standard
6 November 2025
Building performance specialist Mesh looks at the Future Homes Standard - the issues and implications on housing design