If you’ve recently purchased a new build home, you’re likely focused on the visible aspects of your property, the beautiful kitchen, the spacious living areas, or perhaps the landscaped garden. But beneath your feet lies one of the most critical systems in your home: the below-ground drainage network.
While invisible once construction is complete, your drainage system plays a vital role in your home’s functionality and longevity. Problems with drainage can lead to issues ranging from unpleasant odours to serious structural damage if left unaddressed.
Why Drainage Matters
The National House Building Council (NHBC) recognises the importance of proper drainage systems, which is why Chapter 5.3 of their 2025 Standards provides comprehensive guidance on “Drainage below ground.” These standards ensure that builders follow proper procedures when installing:
- Foul water drainage (carrying waste from toilets, sinks, and appliances)
- Surface water drainage (managing rainwater from roofs and hard surfaces)
- Groundwater drainage (removing excess water from around foundations)
When designed and installed correctly, these systems protect your property from water damage, soil erosion, and potential health hazards associated with standing water or sewage backups.
What Can Go Wrong?
Despite the detailed standards, drainage issues can still occur in new builds. Common problems include:
- Slow drainage or persistent blockages
- Foul odours emanating from drains
- Mysterious gurgling sounds in pipes
- Subsidence around drainage areas
- Water pooling in gardens or on driveways
If you’re experiencing any of these symptoms, it’s crucial to address them promptly. Your new home should be protected by the NHBC Buildmark warranty, which covers drainage defects.
Taking Action
Our full guide provides detailed information on what to do if you suspect drainage problems, including how to document issues, approach your builder effectively, and escalate matters if necessary. We also cover preventative maintenance tips to keep your system functioning optimally for years to come.
Understanding the Standards
For those who want to dig deeper, our comprehensive breakdown of the NHBC’s drainage standards explains everything from compliance requirements and documentation needs to specific technical guidance for various drainage components.
Whether you’re currently experiencing drainage issues or simply want to understand this crucial home system better, read our full guide to below-ground drainage in new build homes. Armed with this knowledge, you’ll be better equipped to protect your investment and ensure your drainage system meets the quality standards you deserve.