Plumbing & Drains

Q: Do you manage both high-pressure supply installations and sub-surface drainage remediation?

Yes. We engineer the entire fluid lifecycle of your London or Essex property. From installing high-pressure unvented hot water cylinders (Part G compliant) to conducting CCTV surveys and repairing collapsed external drains (Part H compliant), we ensure both your supply and waste networks are structurally sound.

Fluid Engineering. Structural Protection.

Tarj Construction delivers high-performance mechanical and drainage solutions across London and Essex. From high-pressure unvented system engineering to critical sub-surface drainage remediation, we ensure your building’s fluid infrastructure is compliant, efficient, and future-proofed.

Precision-engineered water and waste systems.

Undetected leaks and failing drainage are the primary drivers of structural degradation and 'technical debt' in UK properties. We treat plumbing and drainage as a core engineering discipline, not just a utility. Our team focuses on high-integrity installations and forensic repairs that eliminate the risk of water ingress, mould growth, and foundation erosion. Whether integrating smart-water management or remediating failing Victorian drainage, we deliver systems that meet rigorous Part G and Part H Building Regulations while providing the pressure and reliability required for modern high-end living.

High-Pressure Unvented Water Systems (Megaflo etc.)
Complex Drainage Remediation & Redirects
Multi-Unit Residential Plumbing Infrastructure

Regulatory Compliance & Part G Sign-off
Smart-Leak Detection & Preventive Maintenance

Technical Mechanical Scope & Fluid Engineering

Engineered supply, distribution, and structural moisture control.

High-Pressure Water Infrastructure

Engineering balanced, acoustic-optimised supply networks for modern living.

Unvented hot water cylinder integration (G3 Building Regs compliant)
WRAS-approved manifold plumbing to eliminate hidden joints during Whole-Home Refurbishments
Acoustic decoupling of high-flow lines to prevent 'water hammer' in residential structures
Installation of smart-leak detection and automated shut-off valves
Hydrostatic pressure testing and systemic flow balancing

Sub-Surface Drainage & Attenuation

Mitigating flood risk and ensuring Part H compliance in London and Essex.

CCTV forensic condition surveys to identify structural failure before Construction & Groundworks begin
Installation of soakaways and storm-water attenuation crates
Deep-trench groundworks and primary soil stack remediation
Foul water redirects and anti-siphon valve integration
Sustainable Urban Drainage Systems (SUDS) alignment for new developments

High-Spec Wet Area Integration

Precision plumbing for luxury and high-traffic washrooms.

Engineering concealed cisterns and wall-hung sanitaryware
High-flow thermostatic shower manifolds integrated with our Bathroom Modernisation service
Commercial-grade grease trap and waste integration
Coordination with structural tanking and waterproofing membranes

Hydronic Heating & Thermal Distribution

Optimised fluid transport for modern climate control and energy efficiency.

Multi-zone hydronic underfloor heating (UFH) pipework
System thermal balancing and flow-rate optimisation
High-efficiency radiator integration and pipe concealment for Cottage & Period Homes
System power-flushing and magnetic filter installation

Statutory Commissioning & Governance

Rigorous testing to eliminate liability and ensure asset safety.

Comprehensive Part G (Sanitation) and Part H (Drainage) alignment
Building Control coordination for major drainage alterations
Delivery of comprehensive O&M manuals via our Project Governance framework
Integration into your property's 'Golden Thread' for maximum asset traceability

The Construction-Led Advantage

Structural protection, statutory compliance, and fluid engineering.

Structural Protection & Flood Mitigation

Water ingress is the fastest way to destroy property value in London and Essex. Our pressure-tested, manifold-based plumbing eliminates hidden joints, actively protecting your asset’s structural fabric and finishes from the catastrophic costs of latent leaks and damp.

High-Performance Fluid Dynamics

We don’t just connect pipes; we engineer systemic flow. By balancing pressure and acoustically decoupling high-velocity lines, we deliver silent, high-efficiency water delivery capable of supporting luxury wet-rooms and modern commercial demands.

Statutory Governance & Liability Shield

From Part G (Sanitation) to Part H (Drainage), we ensure every mechanical intervention is legally sound. We provide the rigorous testing and certification required to satisfy Building Control and protect your insurance validity.

Lifecycle De-Risking & Durability

Constant reactive repairs drain capital. By treating plumbing as a systemic engineering discipline, we eliminate the 'technical debt' of recurring blockages, failing valves, and degraded pipework, drastically reducing your long-term maintenance liabilities.

Forensic Diagnostics. Engineered Execution.

Our fluid engineering and remediation framework.

We keep compliance practical: clear stages, documented evidence, and a trail you can rely on for governance and audit.

01. Forensic System Audit & CCTV Inspection

A deep-dive investigation into existing pipework, acoustic transfer, and sub-surface drainage health across your London or Essex property to identify latent failure points before commencing Whole-Home Refurbishments.

02. Mechanical Specification & Regulatory Strategy

Mapping high-pressure supply lines and Part H compliant waste routing to ensure optimal fluid dynamics, acoustic isolation, and seamless integration with the existing structural fabric.

03. Precision Integration & Manifold Installation

Executing the physical routing of WRAS-approved infrastructure. This phase is seamlessly coordinated alongside our Kitchen Engineering and Bathroom Modernisation teams to eliminate spatial conflicts.

04. Hydrostatic Testing & System Commissioning

Subjecting the newly integrated network to rigorous hydrostatic pressure testing, thermal balancing, and leak verification to guarantee faultless operation under peak residential or commercial load.

05. Statutory Certification & 'Golden Thread' Handover

Delivery of full Part G/H compliance certificates and a comprehensive digital O&M manual via our Project Governance protocols, followed by a specialist handover clean.

Need a reliable plumbing solution?

Keep your system efficient, secure, compliant, dependable.

Speak with our construction team today to discuss your plumbing or drainage project. From installation to system upgrades, we deliver structured solutions built to perform.

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Frequently asked questions

Yes. We engineer the entire fluid lifecycle of your London or Essex property. From installing high-pressure unvented hot water cylinders (Part G compliant) to conducting CCTV surveys and repairing collapsed external drains (Part H compliant), we ensure both your supply and waste networks are structurally sound.

Risk mitigation is built into our mechanical process. We utilise WRAS-approved manifold plumbing to eliminate hidden joints wherever possible. Before any walls or floors are closed—particularly during a Whole-Home Refurbishment—we conduct rigorous hydrostatic pressure testing to guarantee absolute system integrity and zero pressure drops.

Absolutely. As a construction-led firm, our mechanical engineers work directly alongside our structural and fit-out teams. Whether we are rerouting primary soil stacks for an open-plan Kitchen Engineering project or integrating hydronic underfloor heating, we sequence the works to eliminate 'trade clashes' and protect your high-end finishes.

We deliver a comprehensive digital O&M (Operation & Maintenance) manual upon handover. Managed through our Project Governance framework, this 'Golden Thread' includes compliance notifications, pressure test certificates, and warranties, ensuring your asset remains fully protected.