Undertaking the water calculation is a simple part of the building compliance process, yet it is an important one. If it is overlooked, assumed default data will be entered into the SAP calculation, which will have a negative impact on the final EPC score awarded to the property.

Anyone planning an extension, converting their property, or building an entirely new dwelling needs to comply with water efficiency targets laid out in part G of the building regulations.

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

Who We Work With

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.

Related Content

Talk to us about Water Calculation

Drop files here or
Accepted file types: pdf, jpg, png, dwg, xlsx, Max. file size: 20 MB.
    PDF files are preferred.
    This field is for validation purposes and should be left unchanged.