U-Value Calculations

A comprehensive analysis of your building’s thermal performance

Optimising your building to keep the cold out and the heat in

U-value calculations measure the rate of heat transfer through building elements, such as walls, floors, roofs, and windows.

They are a mandatory requirement for Building Control approval and play a vital role in designing energy-efficient buildings. If they are not estimated correctly, you’re likely to face failed checks and high energy bills, neither of which are desirable at any stage of your project.

Our U-value calculation service provides fast, accurate reports that address issues like thermal bridging and underperforming materials. With tailored advice and up to 3 revisions included in our packages as standard, we provide everything you need to ensure compliance, optimise your results, and avoid costly reworks.

Why do you need this service?

Regulatory
compliance

Lower U-values indicate better insulation and reduced heat loss, making them critical for meeting Part L Building Regulations.

Smarter material
choices

Having these calculations to hand enables informed decisions about insulation and building materials, balancing cost, performance, and sustainability.

Energy
efficiency

U-value calculations are central to reducing heat loss, ensuring lower energy costs, and creating a more comfortable indoor environment.

Our Process

Collect construction details,

including submitting material specifications and build-up information.

Perform U-value calculations

using advanced tools.

Review and optimise

to align with your design requirements.

Issue a detailed report

with clear actions.

Why choose Energy Digest?

Our custom solutions will provide you with fully tailored U-value calculations for all building elements, resulting in more accuracy for your unique designs. 
Our reports are detailed, and after presenting our findings, we will supply a list of expert recommendations to help you improve your building’s overall energy efficiency.

To simplify compliance and help you save on costs, we provide U-value calculations for free when they are combined with our SAP or SBEM calculation services. Contact us for more information.

Fast turnaround time

To help you meet your own deadlines, we’ll issue your U-value calculations within 24 hours.

Multi-disciplined team

We cover 20+ services in the built environment, with specialists providing high-value calculations and strong advice.

Practical solutions

Our professionals provide recommendations that are calculated to ensure real world outcomes, resulting in cost-effectiveness and high impact.

Unrivalled support

Our service doesn’t end with the reports. We can provide ongoing support and expertise, from planning to completion.

Speak to our
experts today

FREQUENTLY ASKED QUESTIONS

U-value Calculations
FAQs

All key building elements, including walls, floors, roofs, windows, and doors, require U-value assessments to meet UK Building Regulations.

Typical targets for new UK builds are:

  • Walls: 0.18 W/m²K or lower
  • Roofs: 0.13 W/m²K or lower
  • Floors: 0.15 W/m²K or lower

Thermal bridging accounts for heat loss at junctions or corners. Ignoring it can result in underestimated heat loss and non-compliance with regulations.

BR443 provides standardised conventions for U-value calculations, ensuring consistency, accuracy, and compliance with UK Building Regulations.

What are the key components
of U-value calculations?

Thermal conductivity evaluates how well each material in the element conducts heat energy. Lower conductivity materials, like insulation, will ultimately enhance the building's thermal performance. 

The thickness of each material layer will affect its resistance to heat flow, reducing the U-value, so this is something we will assess as part of our checks. We also use thermal bridging to identify the areas where heat is escaping the construction element more rapidly, such as stud work.

Josh was very helpful throughout, responded quickly and provided guidance where needed to ensure our final SAP and condensation risk assessments were completed quickly.

Jonathan Cook

Excellent fast service. I cannot believe how easy this was, Joshua walked me through the process & made it effortless and simple. I highly recommend this company.

Ann Cawley

I received a very prompt service at a reasonable price and more than I actually requested, Josh was very helpful and generous with his time.

Francesco Zafarana

Spoke with Josh who not only reassured me but asked for a fee that I thought was fair. Thank you Josh. Use again? Definitely.

Steve Quirk

The team really know their stuff – super helpful and always had clear answers to any questions or compliance issues we ran into. Definitely our go-to for any future projects!

Nathan Donnelly

Quick and well priced water calculation service and received an appliance specification report alongside the certificate which was really useful for us and the building control officer, highly recommended!

Ilma Akhtar

Very knowledgeable about building regulations, and the industry. Always goes the extra mile to help out! 5*

Karim Meraga

Still unsure?

We offer free phone call and email support until you’re ready to proceed with us.
Access free support for your project now.

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