Plumbing, Pipes, Tapware, Toilets & Showers – Specifications

Pipes & Drainage System

• Designed and installed in accordance with AS/NZS 3500.1 (Water services) and AS/NZS 3500.2 (Sanitary plumbing and drainage)
• Materials: High-quality copper, PVC, or polypropylene pipes and fittings suitable for Australian conditions
• Correct pipe sizing for flow and pressure requirements
• Proper fall/gradients for drainage
• Backflow prevention devices installed to protect the mains water supply
• Underground pipework installed with minimum cover depths and pressure-tested
• Overflow relief gullies (surcharge gullies) installed to QPWC and AS/NZS 3500.2 requirements (typically 75 mm below finished floor level internally and above external ground level)

This system ensures reliable performance, prevents leaks or blockages, and protects against contamination.

Tapware

• All basin, kitchen, and laundry taps/mixers are WaterMark certified to AS/NZS 3718
• Lead-free compliant (in line with current and upcoming national requirements)
• Selected with strong WELS (Water Efficiency Labelling and Standards) ratings to reduce water consumption and running costs
• High-quality finishes chosen for durability and aesthetics while meeting all performance standards

Toilets

• Dual-flush models only
• WaterMark certified to AS 1172.2 (or equivalent current standard)
• WELS rated (typically 4–6 stars) for excellent water efficiency
• Installed with correct pan connections, cisterns, and waste pipes to prevent leaks and ensure proper operation

Showers

• Showerheads and mixers are WaterMark certified
• WELS rated (typically 3–6 stars), limiting flow while maintaining good pressure (usually ≤ 9 L/min)
• Thermostatic or pressure-balanced mixers used where appropriate to prevent scalding
• Heated water services installed to AS/NZS 3500.4

Key Benefits of Our Plumbing Specification

• Full compliance ensures your granny flat passes all plumbing inspections and receives building approval without delay
• Water-efficient fixtures help reduce ongoing water bills
• High-quality materials and professional installation provide long-term reliability
• Protects your investment and simplifies future rental or resale (especially under Queensland water charging rules for secondary dwellings)
• All work is carried out by licensed professionals with full certification provided

Note: Specifications may vary slightly depending on site conditions, council requirements, or chosen upgrades. All variations remain fully compliant.We handle the complete plumbing design, supply, installation, and certification process for every Grannyflats4u project.