Category: Drains, Sewer & Stormwater

A drain that blocks once may have a simple local obstruction. A drain that keeps blocking is different. Repeated problems can indicate a restriction, damaged pipe, tree roots or another issue further along the drainage system.

For more detail on the service itself, see our blocked drains page.

Build-up inside the pipe

Grease, soap, hair and other material can gradually reduce the internal diameter of a drain until normal use causes it to block.

Tree roots

Roots can enter damaged joints or cracks and create recurring restrictions. Clearing the blockage may restore flow temporarily without fixing the damaged section.

Damaged or displaced pipes

Cracked, collapsed or poorly aligned drainage can catch waste and lead to repeated blockages.

The blockage may be further away than you think

If several fixtures are affected, the issue may be in a shared drain rather than the individual sink, shower or toilet.

Why repeated plunging is not enough

A plunger may move a soft local blockage, but it does not diagnose structural problems or remove roots and heavy build-up further along a drain.

When professional drain cleaning helps

Depending on the cause, plumbers may use drain cleaning equipment, high-pressure water jetting or other methods to restore flow.

Recurring blockages need inspection

If the same drain keeps failing, identifying why it blocks is more useful than simply clearing it again.

Related plumbing services

You may also find these related service pages useful: blocked drains, tree root removal from drains, sewer, drains and blockages.

Need help with this type of plumbing?

If you are planning this work or dealing with a problem now, see our blocked drains service page for the relevant plumbing options and next steps.

Clearing a blocked drain and understanding why it blocked are two different jobs. High-pressure water jetting can remove many obstructions, while a CCTV drain inspection can show the condition of the pipe and reveal problems such as roots, damage or recurring build-up.

For more detail on the service itself, see our CCTV drain inspections page.

What high-pressure water jetting does

Water jetting uses high-pressure water through specialised drain equipment to break up and flush away many types of blockage and build-up.

What a CCTV drain inspection does

A drain camera allows the inside of accessible pipework to be inspected after or during diagnosis. It can help locate damage, roots, displaced joints and other problems.

Why the two methods are often used together

A badly blocked drain may need to be cleared before the camera can travel through it. Once flow is restored, inspection can help determine whether the blockage was isolated or caused by a pipe defect.

Recurring blockages deserve a closer look

If a drain repeatedly blocks in the same area, inspection may identify a structural cause rather than treating it as another routine blockage.

The result guides the next repair

If the pipe is sound, cleaning may be enough. If significant damage is found, options may include targeted drain repairs, replacement or relining depending on the situation.

Diagnosis avoids unnecessary excavation

Knowing the likely location and nature of a problem helps avoid digging up large areas without a clear reason.

Related plumbing services

You may also find these related service pages useful: CCTV drain inspections, high-pressure water jetting, drain repairs.

Need help with this type of plumbing?

If you are planning this work or dealing with a problem now, see our CCTV drain inspections service page for the relevant plumbing options and next steps.

Water pooling around a house after rain is more than an inconvenience. Repeated ponding can affect landscaping, paths and areas around the building. The cause may be at the surface, underground or higher up in the roof drainage system.

For more detail on the service itself, see our stormwater drainage page.

Poor surface falls

If paving, soil or landscaping falls toward the house rather than away from it, water can collect even when the underground drainage is working.

Blocked stormwater pipes

Leaves, silt, roots and debris can restrict stormwater pipes and cause pits or downpipes to back up during heavy rain.

Insufficient pits or surface drainage

Large paved or low-lying areas may need suitable pits, channel drains or other collection points to move water away efficiently.

Downpipe and roof drainage problems

Overflowing gutters or downpipes can dump large volumes of water beside the building. The problem may be above ground rather than in the yard drainage.

Damaged or poorly connected pipes

Crushed, broken or disconnected stormwater pipes can reduce flow and allow water to escape into surrounding soil.

Drainage needs to suit the whole site

Fixing one low spot may not solve the underlying issue if the broader property has poor falls or insufficient drainage capacity.

Diagnosis should come before excavation

A plumber can assess where water is entering, how it is supposed to leave and whether the issue is surface drainage, pipework or roof water.

Related plumbing services

You may also find these related service pages useful: stormwater drainage, yard drainage, stormwater overflow and flooding solutions.

Need help with this type of plumbing?

If you are planning this work or dealing with a problem now, see our stormwater drainage service page for the relevant plumbing options and next steps.

Stormwater drainage is not one single product. Different parts of a property may need pits, channel drains, surface grading or underground pipes depending on where the water is coming from and how it needs to be collected.

For more detail on the service itself, see our stormwater pits page.

Stormwater pits

Pits collect water at a low point and connect it into underground stormwater pipework. They are commonly used in yards, paved areas and other locations where water naturally gathers.

Channel drains

Channel drains collect water along a line rather than at one point. They can be useful across driveways, garage entries, courtyards and other paved areas.

Yard drainage

Yard drainage may involve surface grading, pits, trench drains or underground drainage depending on the site. The goal is to prevent water from sitting against buildings or creating persistent wet areas.

Downpipe connections

Roof water needs to be connected into a suitable stormwater system. Problems can occur if downpipes discharge to unsuitable areas or connect into blocked pipework.

One property may use several methods

A driveway might use a channel drain while a lawn uses pits and surface falls. Good drainage design treats each area according to how water behaves there.

Choose the solution after identifying the cause

Installing more drains does not automatically solve a water problem. The levels, outlet, pipe capacity and source of the water need to be understood first.

Related plumbing services

You may also find these related service pages useful: stormwater pits, channel drains, yard drainage.

Need help with this type of plumbing?

If you are planning this work or dealing with a problem now, see our stormwater pits service page for the relevant plumbing options and next steps.