Water Efficiency Calculations for Building Regulations (Part G Compliance)

Compliant. Fast. Affordable.

If you’re building, converting, or refurbishing a residential property in England, Water Efficiency Calculations are a mandatory requirement under Part G of the Building Regulations. At Assessment Hive, we offer a fast, affordable, and fully compliant water calculation service tailored to help you secure building control approval without delays.

Whether you’re a homeowner, architect, or developer, our experienced team can deliver accurate reports with quick turnaround times and expert guidance.

---

✅ What Are Water Efficiency Calculations?

Water Efficiency Calculations determine the estimated internal water use per person per day in a residential building. According to Building Regulations Part G, all new dwellings must demonstrate they use no more than:

• 125 litres per person per day (England standard), or

• 110 litres per person per day in local authority areas with tighter water conservation policies

The calculation considers the consumption of water through all key fittings, including toilets, taps, showers, baths, and appliances. It’s typically carried out using the methodology in the Water Efficiency Calculator for New Dwellings (WECD) provided by the UK Government.

These calculations are submitted to building control to show your project meets the necessary standards.

---

🏡 Who Needs a Water Efficiency Calculation?

You’ll need a water efficiency assessment if you’re involved in any of the following:

• New build residential projects

• Conversions (e.g., commercial to residential)

• Material changes of use involving new bathrooms or kitchens

• Large-scale developments involving multiple units

If you’re unsure whether your project requires this assessment, we’ll be happy to guide you. We also offer SAP Calculations and Overheating Assessments — ideal for ensuring full compliance across all regulatory areas.

---

🛠️ What’s Included in Our Water Efficiency Calculation Service?

At Assessment Hive, we provide a comprehensive water efficiency report that includes:

• Fully compliant calculations based on your building plans and specifications

• PDF report for direct submission to Building Control

• Expert advice if your design exceeds target usage

• Recommendations for reducing water usage, if needed

• Super-fast delivery — typically within 24 hours

We work closely with you to ensure your water fixtures and fittings meet the necessary performance criteria, avoiding delays or costly rework.

---

📄 What Do We Need from You?

To get started, we’ll just need the following:

• Floor plans and layout drawings

• Specification of sanitaryware (flow rates, flush volumes, etc.)

• Any additional documentation on fittings and appliances

Once we receive the required information, our team will begin work immediately.

---

🚀 Why Choose Assessment Hive?

Choosing the right partner for your Water Efficiency Calculations matters. Here’s why hundreds of clients trust Assessment Hive:

• ✅ Same-day service available

• ✅ Transparent, fixed pricing — no hidden charges

• ✅ In-house qualified assessors

• ✅ Reports accepted by all Building Control Bodies

• ✅ Friendly, professional support every step of the way

We specialise in energy and environmental assessments, and our clients include developers, architects, contractors, and private homeowners across the UK.

---

🌱 Why Water Efficiency Matters

Water conservation is more than just a compliance issue — it’s an environmental priority. With increasing pressure on water resources, especially in densely populated areas, designing efficient homes helps:

• Lower household utility bills

• Reduce environmental impact

• Support long-term sustainability goals

Planning departments are increasingly asking for evidence of water-saving measures — not just for compliance but as part of wider sustainability statements and local development frameworks.

---

💬 What Our Clients Say

“Assessment Hive made the whole process simple. Their water efficiency calculation was accepted straight away by Building Control. Great service and fast turnaround!”
— Anna, Developer in London

“The team helped us reduce our projected usage to meet the 110L target. Super helpful and very responsive.”
— Tom, Self-builder in Oxford

We’re proud of our reputation for delivering fast, accurate, and reliable compliance reports — with zero fuss.

---

🧾 Summary of Service

---

🎯 Contact Us Today

Let us take care of your water compliance needs while you focus on your build.

✔ Quick turnaround
✔ Local qualified assessors
✔ Clear, actionable reports
✔ Fixed, affordable pricing

📞 Call us on 020 7183 3240
📧 Email us at [email protected]
📝 Request Instant Quote → Click Here

---

Assessment Hive — Experts in Compliance

We’re committed to helping UK builders, architects, and developers meet building regulations with speed and accuracy. From Water Efficiency Calculations to EPCs, we offer the support you need, when you need it.