About Us

At One Heat Loss, we specialise in accurate, MIS-3005-compliant heat loss calculations, helping you optimise low-carbon heating systems, whether for a retrofit or a new build.

Correctly sizing heat pumps, boilers, and heat emitters is key to ensuring energy efficiency and long-term cost savings.

We offer flexible options for homeowners, installers and developers. Whether you prefer remote calculations via building drawings or a full on-site visit, our assessments will help you lower energy bills, meet regulatory standards and enhance overall comfort. Our expertise ensures that every heating system recommendation is tailored to the unique specifications of your property.

Who we work with

We partner with homeowners, installers and property developers to ensure the correct sizing of heating systems, including heat pumps, boilers, radiators and underfloor heating. Our heat loss calculations support installers in making informed decisions, ensuring compliance with industry standards, while homeowners benefit from heating systems that maximise comfort and minimise energy costs.

View our Services

Architects

Builders

Homeowners

Installers

Project Managers

15

higher energy efficiency in systems designed under MIS 3005

300

average savings per year on heating for homes with systems properly sized using heat loss assessments

30

excess energy use caused by inaccurate heating system sizing

10

reduction in upfront equipment costs

“

Stephen was incredibly professional and efficient when conducting our heat loss assessment, ensuring every detail was covered with precision. The information he provided was not only accurate but also comprehensive, helping us make informed decisions. His expertise and attention to detail were truly exemplar, making the entire process seamless and stress-free.
Mark DenmanJMR Heating & Energy

“

We recently engaged One Heat Loss for our commercial heat loss calculations, and we couldn’t be more satisfied with their service. From start to finish, their team demonstrated exceptional professionalism and expertise. They provided detailed and accurate calculations, ensuring our project stayed on track and within budget. Their customer service was top-notch, always responsive and willing to go the extra mile to address our concerns. We highly recommend One Heat Loss for anyone in need of reliable and precise heat loss calculations. A truly outstanding experience!
David HartshorneTechnical Operations Manager

“

I have worked with Stephen for a number of years on a sub contract basis completing both site surveys and heat loss calculations. One Heat Loss have been professional, punctual and offer excellent value to any business. I am pleased to recommend Stephen and One Heat Loss to any and all potential customers.
Paul GaddGhps

“

Having worked with One Heat Loss on a regular basis we have found them to be both professional and knowledgeable. They have assisted us on several difficult projects, providing Heat Loss Surveys that are comprehensive and allow us to design heating systems that are efficient and cost effective for our customers. I would not hesitate in recommending One Heat Loss to homeowners and other businesses who require Heat Loss Surveys for their own builds and heating projects.
Damon BlakemoreBlakemore Plumbing and Heating

Onwards & Upwards Project

Onwards and Upwards is a vibrant centre based at Woodhouse Road. We visited the site to conduct a heat loss calculation to see the building's current performance.

Anglesey Commercial Project

In early 2024, we were engaged by our client to undertake independent heat loss assessments across multiple sites in Anglesey, comprising seven schools and three care homes.

Newport House: A Historic Restoration

Newport House, one of Herefordshire’s most significant Grade II listed properties, sits in a tranquil location surrounded by 427 acres of stunning countryside.

Want to find out more?

Email us

Latest News

News

One Heat Loss Limited.
Site by Outwood Marketing