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The full scope of works.

Every line item HQ carries on a commercial build, grouped into the eight stages your program runs them in. Read it against your scope of works, or put the drawings in front of Mitchell first.

01

Early works

4 items

Set-out, drawing review, and the temporary services that keep a site running.

  • Site establishment and plumbing set-out
  • Hydraulic and plumbing drawing review
  • Temporary water services
  • Temporary site amenities plumbing
02

Underground

10 items

Sewer, trade waste and stormwater: the services that go into the ground first.

  • Underground sewer installation
  • Boundary traps
  • Trade waste drainage
  • Grease trap installation
  • Pump pits and sewer pump systems
  • Underground stormwater installation
  • Stormwater pits and drainage
  • Roof drainage connections
  • Downpipe connections
  • Soakwells and soakage systems
03

Water services

14 items

From the water main to every outlet, with backflow protection and the fire and irrigation feeds.

  • Underground water mains
  • Incoming water service
  • Water meter connections
  • Backflow prevention devices
  • RPZD installation
  • Double check valve installation
  • Cold-water reticulation
  • Hot-water reticulation
  • Hot-water return and circulation lines
  • Hot-water unit installation
  • Fire hydrant pipework (within plumbing scope)
  • Fire hose reel pipework (within plumbing scope)
  • Fire service connections (where appropriately licensed)
  • Irrigation and reticulation water supply connections
04

Plant and gas

7 items

Plant room pipework and pressure control, with the gas run under HQ’s own gas fitting licence instead of a second subcontractor.

  • Plant room pipework
  • Booster pump installation
  • Pressure-reducing valve stations
  • Expansion vessels
  • Gas pipework GF 19966
  • Gas meter connections GF 19966
  • Gas appliance connections GF 19966
05

Rough-in

4 items

The pipework that disappears: into walls, into slabs and through ceiling spaces.

  • In-wall plumbing rough-ins
  • In-slab plumbing rough-ins
  • Ceiling-space pipework
  • Fire collars and penetration coordination
06

Fit-off

15 items

Every fixture and connection, from sanitaryware through to commercial kitchens.

  • Toilet installation
  • Urinal installation
  • Basin installation
  • Sink installation
  • Shower installation
  • Bath installation
  • Tapware installation
  • Floor waste installation
  • Drinking fountain and bubbler installation
  • Dishwasher connections
  • Commercial kitchen plumbing
  • Laundry plumbing
  • Accessible and ambulant bathroom fit-off
  • Hose tap installation
  • Final fixture fit-off
07

Testing

11 items

Water and gas proven under pressure, then commissioned and documented.

  • Sewer testing
  • Water pressure testing
  • Hydrostatic testing
  • Leak testing
  • Drain camera inspections
  • Backflow device testing
  • Flushing and commissioning of water services
  • Gas pressure testing GF 19966
  • Gas commissioning GF 19966
  • Hot-water system commissioning
  • Final testing and commissioning
08

Handover

5 items

Defects closed, as-builts marked up, and the compliance trail handed over.

  • Defect rectification
  • As-built information and mark-ups
  • Plumbing compliance documentation
  • Handover documentation
  • Maintenance and warranty works

On the drawings but not on this list?

Seventy line items is the usual shape of a commercial package, not the limit of one. Call and walk the hydraulics with Mitchell.

0430 862 221

Residential work, too.

Hot water units, bathrooms, laundries and gas appliances for Perth homes.

Residential services

Site establishment through to testing, commissioning and handover — the plumbing and the gas, under one contractor.

0430 862 221

Or email mitch@hqpg.com.au

Licences

Plumbing contractor
PL 11442
Gas fitting
GF 19966
Member
Master Plumbers Association

Contact

© 2026 HQ Plumbing & Gas

Perth, Western Australia