While water calculations may seem like a small step in the building compliance process, they can have a big impact on your project timeline and final EPC rating. Missing or inaccurate calculations can lead to delays, rework, and a lower EPC score, affecting your property value.

Ensure smooth building control and a water-efficient building with our expert water calculations service. We can help you to comply with Part G of the building regulations, focusing on water efficiency, and deliver fast, accurate calculations to keep your project on track.

Who needs to comply with Part G? Anyone planning an extension, converting their property, or building an entirely new dwelling needs to comply with water efficiency targets for building control.

Our team can provide advice on building regulations and quick turnaround quotes for all compliance calculations.

Why work with us?


Our sustainability consultants have extensive experience in meeting regulatory requirements, yet work hard to go beyond mere compliance with the building regulations.

We pride ourselves on delivering decarbonisation advice to help our clients build lower carbon, energy-efficient properties.


We reduce the amount of assumed data in each calculation to the bare minimum, meaning that our water calculations are as accurate as possible.

Conversations with clients are key to this process and our work improves each time we work on a new project, thanks to the collaborative approach we adopt with our clients.


Our office-based staff work hard to book all projects in as quickly as the delivery schedule allows.

We work on a two-week schedule, with the vast majority of water calculations being delivered well within that window.


Our rate card prices for all services are reviewed regularly, so we’re confident that you won’t find a better service for a better price anywhere else.

If you think you’ve found one, we’ll either beat or match it.


Navigating the complexity of energy efficiency, decarbonisation, and building regulation updates isn’t easy. We’ve worked hard to explain a range of topics related to building compliance in plain English to help non-experts get the information they need.

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