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Understanding Manholes: What They Are and Why They Matter

Understanding Manholes

Table of Contents

Manholes might not be glamorous, but they play a critical role in keeping your drainage system accessible, safe, and functional. Whether you’re a homeowner planning an extension or a landlord managing multiple properties, knowing how manholes work — and the laws around them — is essential.

At Portsmouth Drains24, we regularly inspect, repair, and maintain manholes across the city, from Southsea and Fratton to Cosham and Port Solent. Here’s everything you need to know about manholes, their construction, ongoing maintenance, and your legal responsibilities.

🕳️ What Is a Manhole?

A manhole is an access point to an underground drainage system, usually leading to sewer or stormwater pipes. It allows engineers to:

  • Inspect pipe conditions
  • Clear blockages
  • Carry out CCTV surveys
  • Perform repairs without major excavation

Manholes are typically found in roads, pavements, gardens, and driveways — and may be made of various materials including precast concrete, brick, or plastic.

🧱 How Are Manholes Constructed?

Modern manholes are built to strict specifications to ensure safety and long-term durability. The typical components include:

  • Chamber – A vertical shaft, usually concrete or plastic, that provides access to underground drains.
  • Benchings – Sloped concrete surfaces that direct water flow and prevent debris buildup.
  • Cover and Frame – A metal or composite lid that provides secure, load-bearing access at ground level.
  • Step Irons or Ladders – Installed in deeper manholes for safe entry and exit during inspection.

In Portsmouth, older properties may still feature brick manholes, while newer builds are more likely to use modular plastic systems.

🔧 Manhole Maintenance – Why It’s Important

Routine manhole maintenance is essential for preventing drainage issues and costly repairs. Signs that your manhole may need attention include:

  • Cracked or collapsed covers
  • Foul smells or visible waste water
  • Sinking or damaged ground around the manhole
  • Water ingress during heavy rain

At Drains24, we provide:

  • CCTV drain surveys via manhole access
  • High-pressure jetting to remove blockages
  • Structural repairs and benching replacement
  • Cover and frame upgrades for safety and compliance

📜 Legal Requirements & Building Regulations

If you’re planning any building work near a manhole, you must follow strict legal guidelines. Here’s what you need to know:

📍 Building Over or Near a Manhole

Under UK Building Regulations:

  • You must not build directly over a public sewer or manhole without approval from your local water authority (e.g., Southern Water for Portsmouth).
  • Any work within 3 metres of a public sewer or inspection chamber may require a build-over agreement.
  • Covers must remain accessible for maintenance, even if located within a new extension or driveway.

🏠 For Homeowners

  • If your property has a shared or adopted drain, the manhole may fall under public authority ownership, not private.
  • Planning permission may be needed for internal manhole repositioning or removal.
  • Incorrect handling of a manhole during building work could result in fines or forced remedial work.

Before starting work, always contact a qualified drainage expert or seek advice from your local building control department.

Why Choose Drains24 Portsmouth for Manhole Work?

  • ✅ Local knowledge of Portsmouth drainage networks
  • ✅ Fully insured, qualified engineers
  • ✅ CCTV inspections, surveys, and reporting
  • ✅ Repairs, cover replacements, and manhole construction
  • ✅ Trusted by homeowners, landlords, and builders alike

Need Help with a Manhole in Portsmouth?

Whether you’re planning a renovation or have spotted signs of damage, we’re here to help. Portsmouth Drains24 provides comprehensive manhole inspections, maintenance, and legal guidance.

📞 Call today for expert advice or a free quote.

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