We’ve Made Changes Mid-Build — Do We Need New SAP Calculations?

Picture this: you’re halfway through building your latest development when your client decides to upgrade the windows to triple-glazed aluminium frames. Or your supplier can only source a different type of insulation. These might seem like minor changes, but they can significantly affect your SAP rating.

Developers often make these decisions based on aesthetics, price, or supply chain issues without considering the regulatory impact. But under Part L compliance, any material change that affects the building’s energy profile could invalidate your original SAP Calculations. That means your EPC could be incorrect, and worse, your build might fail sign-off.

So what do you do?

You call EnviroSolution. We specialise in revising SAP Calculations throughout the project lifecycle. Whether you’re mid-build or near completion, we can quickly reassess your updated specification and ensure that you remain compliant.

Our experienced team reviews the updated plans or as-built documentation and calculates how the changes affect the building’s overall energy performance. We then advise you on any mitigation needed. For example, if swapping out insulation reduces thermal performance, we may recommend upgrading the boiler efficiency or adding a renewable feature.

Real-life example: A client swapped out standard doors for beautiful full-glass sliding ones, which reduced the dwelling’s overall U-value. We worked with them to model the effect and advised adding a small solar PV array to rebalance the carbon emission score — job saved, and the aesthetic was maintained.

With regulatory bodies becoming stricter in their inspections, especially with the incoming Future Homes Standard, keeping your SAP Calculations current is not optional — it’s essential.

And it’s not just about passing inspection. Accurate SAP reports are needed to produce the EPCs that are legally required to rent or sell the property. If the SAP doesn’t reflect the final build, you’re at risk of misrepresentation.

By working with EnviroSolution, you can:

• Ensure ongoing compliance with Part L
• Avoid delays or fines at sign-off
• Adjust plans without risking your EPC
• Future-proof your design for upcoming energy standards

We handle both design-stage and as-built SAPs with equal speed and accuracy. And our customer-first approach means you get clear timelines, expert support, and no surprise fees.

Don’t gamble on your energy compliance. Update your SAP Calculations as your project evolves — and stay one step ahead of the regulators.