Why Inspection Pits Matter in New Drainage Work
Coburg North has seen a wave of subdivision and knock-down-rebuild activity over the past decade — dual occupancy homes, townhouses, and granny flat additions are common across the suburb. Every new dwelling needs its own drainage connection, and that means new drain lines, new connection points, and new infrastructure that needs to be accessible for the life of the building.
That's where inspection pits come in. Rather than burying a drain line and never being able to access it, a properly installed inspection pit gives future plumbers a camera entry point and cleaning access at key junctions in the drain system. It's standard practice on new drainage installations and a requirement under the plumbing code.
What You're Seeing in This Photo
Two new white PVC inspection shaft pipes have been set upright in a concrete base in an excavated garden area — the chrome fittings at the base are compression-type adaptors connecting into the drain line below. The concrete encasement anchors the pipes in position and prevents movement as the surrounding soil is backfilled. The taller pipe is the main inspection access; the shorter pipe alongside is likely a second inlet or vent point for the junction.
This configuration is typical for a property with a new drainage rough-in — perhaps a new outbuilding, secondary dwelling, or extension — where the drain connections are being established from scratch to connect into the existing property sewer or direct to the council main.
When New Drain Infrastructure Is Needed in Coburg North
Every new dwelling on a subdivided Coburg North block needs its own drainage connection to the sewer. We design and install the complete drain system from the dwelling to the connection point.
Adding a granny flat to a Coburg North property often requires a new drain line run from the new structure across the block to connect into the existing house sewer or directly to the main.
Converting a garage to living space requires plumbing — and plumbing requires drainage. We rough in the drain infrastructure before slabs are poured.
Extending bathrooms, adding laundries, or moving kitchen plumbing in Coburg North's older homes often requires new drain lines that need to be properly connected and have access points installed.
Coburg North is in the City West Water service area. New drain connections and sewer work must be carried out by a licensed plumber and notified where required. We handle the paperwork and notifications as part of every installation.
The Installation Process for New Drain Infrastructure
- Design and gradient calculation: We design the drain route from the new fixture/building to the discharge point, calculating gradients (minimum 1:80 for sewer, 1:100 for stormwater) throughout
- Excavation: Trenching along the drain route, ensuring consistent fall and correct depth below finished surface level
- Pipe laying: PVC pipe bedded on compacted sand, joints connected, inspection pit shafts positioned at required access points
- Concrete encasement: Inspection pit bases are set in concrete to lock position before backfilling begins
- Connection: New drain is connected to the existing sewer at the agreed point, with the correct junction fitting and no cross-connections to stormwater
- Test: A water test confirms the new drain runs freely at the correct flow rate without backing up
City West Water Notification and Compliance
In Coburg North, any work that involves connecting to the sewer or making a new connection to City West Water's infrastructure requires a notification, and in some cases, a permit. We submit these on your behalf and ensure the work passes inspection. This is particularly relevant for subdivision drainage where a new sewer connection is being made to the main in the street.
New Drainage Needed in Coburg North?
Whether it's a granny flat, extension, or full subdivision — we design and install the drainage from scratch. Fixed-price, compliant, done right.