Thoughtful, fast-growing force in sustainable consultancy harnessing analytical theory to deliver multiple projects. Rightly gaining national recognition.
Judges, Bristol Property Awards 2025
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. Learn more about water calculations and find answers to common questions in our FAQ section below.
Our expert sustainability consultants are a team of experienced, friendly, and knowledgeable professionals well-versed in building compliance. Get in touch today for a free consultation or competitive quote.
Why work with us?
Experience
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.
Quality
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.
Speed
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.
Pricing
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.
Support
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 water calculations in plain English to help non-experts get the information they need.
Get Your Water Calculations Quote Today!
Looking for fast and reliable Water Calculations in Bristol or nationwide?
Contact us today for a free quote and to discuss your specific project requirements. We offer competitive rates and prioritise fast turnaround times for all our clients.
Surveying an active shopping centre is logistically complex, but Building Energy Experts handled it with precision. Their report cut through the environmental variables to provide a clear distinction between maintenance quick-wins, like resealing doors, and the capital investment needed for insulation. It provided the exact technical evidence required to inform our roadmap to an EPC B rating and justify the retrofit budget.
Philip Emsley, UEC Energy – Thermographic Survey
In delivery of the Warm Homes: Local Grant programme in Shropshire, Building Energy Experts (BEE) have acted as invaluable partners to the Council. Their expertise in reviewing installer designs and liaising with our consortium of local installers has ensured the technical compliance and appropriateness of measures installed under the scheme.
Merrick Rose, Affordable Warmth & Energy Efficiency Support Officer, Shropshire Council – WH:LG Retrofit Coordination
The Council’s goal was to find a critical friend that ensures best practice and full PAS2035 compliance under schemes it delivers – BEE have brought this in spades, accompanied with a professionalism and pragmatism that has been indispensable in navigating the nuances and complexities of local authority led, domestic retrofit schemes. I would highly recommend engaging with BEE to any council or social housing provider considering an independent retrofit coordination model.
This entry provides clear evidence across multiple projects where Building Energy Experts has successfully forged strong partnerships, driving innovation and delivering outstanding outcomes.
Judges, Unlock Net Zero Awards 2025
The organisation is more than a service provider; it is a trusted supply chain partner helping the built environment sector achieve real, measurable progress towards net zero by delivering tangible reductions in emissions, better energy performance and long-term cost savings. With a proven track record, cutting-edge technology and a sustainability-centred ethos, Building Energy Experts stands out as a transformative force in retrofit delivery.
I should like to say thank you so much to Rich and the team at Building Energy Experts for their efficiency and helpfulness in completing our commercial EPC survey in record time.
Margarita Hamilton, Walton Castle – Commercial EPC
Assessing a historic property like Walton Castle requires real expertise, and your team delivered exactly that. Not only did they complete this survey with a very quick turnaround but they went above and beyond by providing extra information and guidance which has been extremely helpful.
We are delighted with the final result and once again thank you from both myself and the team at Walton Castle.
What a great service you provided! As Self-Builders, with a great deal of red tape/bureaucracy to satisfy, you truly made this a real ‘value-add’ and reasonably priced exercise. We thought we were in reasonably good shape (having taken a lot of care and time on our build), but the checklist provided in advance of the test and the report post test, were really helpful in making improvements to the fabric of the building.
Tim Overton, Self-Builder – Air Tightness Test
Understanding Water Calculations: Your Questions Answered
We’ve compiled answers to the most common questions about water calculations and Part G compliance to help you navigate this essential aspect of building design.
What are Water Calculations (Part G)?
Water calculations assess a property’s water efficiency, ensuring it meets the targets set out in Part G of the UK Building Regulations. This demonstrates sustainable water use within new, extended, or converted dwellings.
Why are Water Calculations required?
They are a crucial legal requirement for building control approval. Accurate calculations prevent project delays, costly rework, and positively impact your property’s final EPC rating, ensuring compliance and contributing to a higher property value.
When are Water Calculations needed?
Water calculations are mandatory for all new residential builds, extensions, and conversions. They must be completed and submitted for building control approval to demonstrate compliance with Part G.
How do Water Calculations affect my EPC?
Water calculations directly feed into your SAP calculations, which determine your property’s Energy Performance Certificate (EPC) rating. Accurate calculations help secure a better EPC score, while missing or default data can negatively impact it.
Need Water Calculations?
Contact us today for a free consultation or a competitive quote. Whether you’re preparing for Building Control approval, responding to a planning condition related to water efficiency, or simply looking for guidance on meeting Part G requirements, we can help.
