East Tāmaki · Drainlayer
Drainlayer in East Tāmaki
For a small commercial fitout beneath an existing slab, send the proposed fixture layout and available drainage drawings first.
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A licensed Stately plumber looks at the job on site.
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The immediate task is to check whether the proposed outlets can reach a suitable connection beneath the floor. Stately covers East Tāmaki. Include photographs, the premises address and your builder’s contact details so the drainage work can be coordinated with slab opening, inspections and the floor finish.
Fix the layout before opening concrete
Mark each proposed toilet, basin, sink or floor outlet on the fitout drawing. Give dimensions from walls that will remain, rather than movable partitions. Identify equipment discharges separately and describe what they carry. For commercial discharge, designer and Watercare requirements must be confirmed before the connection arrangement is settled.
We compare that layout with the available records and inspect accessible drainage points onsite. The designer checks the proposed arrangement against the fitout requirements. Consent requirements depend on the actual work, using MBIE guidance. Resolve these matters before ordering finishes or committing to a trench line through the slab.
Locate the connection and slab constraints
Drawings provide a starting point, not a cutting line. We locate the existing drain connection and check its depth, direction, material and accessible condition. Pipe levels matter because the proposed outlets need a workable route. Confirm the slab construction and embedded services with the builder before choosing where to open it.
The excavation plan should show the trench, spoil route and protected access for occupants. Owners maintain private pipes; Watercare manages public wastewater and Auckland Council manages public stormwater. Establish which asset the connection reaches. Building or excavation near public wastewater pipes may require Watercare approval before work proceeds.
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Open only the agreed working area
Agree who arranges slab cutting, dust control, barriers and removal of concrete before excavation starts. Keep stock and occupied work areas clear of the opening. Name the person who authorises interruption to existing drainage, particularly where staff facilities or another tenancy use the pipe being exposed.
We excavate the agreed route and expose enough existing pipe to assess the joint and supporting material. We check the actual levels against the proposed layout before laying pipe. Any change to the route goes back to the builder and designer before the opening grows. This keeps drainage decisions ahead of floor repairs.
Lay pipework and hold inspection points
Restricted drainlaying requires an appropriately authorised person; check authorisation through the PGDB register. We lay the agreed drainage pipework with suitable bedding, support, fittings and accessible inspection points. Where the connection section is damaged, the repair or replacement extent is agreed from the exposed condition rather than guessed from above.
Keep the pipework exposed for the testing and inspections required for the work. Arrange these stages before booking trench closure and concrete placement. New wastewater connections follow Watercare’s application, inspection and completion process. Record test results and inspection outcomes, and resolve any required corrections before the pipes are covered.
Close the trench and document the floor
After the relevant checks, backfill and compact the trench in the agreed sequence. Confirm who reinstates the slab and who completes waterproofing or floor finishes. The builder coordinates those details with the specified floor construction. Protect pipe openings while other trades finish walls, joinery and equipment installation.
At handover, provide available pipe route records, photographs before covering, test information and inspection documentation. Mark access points so future shelving or equipment does not conceal them. Record the surface left by the drainage work and any remaining concrete or finish work, with responsibility for each outstanding item clearly assigned.
Drainlayer: questions from East Tāmaki
Can we move a sink after excavation?
Ask before changing the layout. The drainlayer checks the revised position against exposed levels and access, and the designer confirms any design changes before pipework continues.
What if no drainage drawings exist?
Send the measured fitout layout and photographs of accessible drainage points. Onsite locating and controlled exposure establish the connection position before the trench route is agreed.
When should the flooring contractor start?
Programme flooring after drainage testing, required inspections and slab reinstatement. Have the builder confirm substrate readiness and keep drainage access points clear in the finished layout.
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