External drain unblocking covers gullies, manholes, and underground pipes that carry water to the main sewer. Leaves, soil, moss, grit, and tree roots build up in these pipes over time. Since they sit underground, problems often go unseen until water pools in the garden or backs up indoors. We clear the blockage, flush the pipe, and check for issues that could cause trouble later.
We find all outside access points — manholes, chambers, and gullies — and open them to check water levels. Since this shows which way the water should flow, it helps us pinpoint the blockage.
Our jetting unit feeds a high-pressure hose into the blocked section of pipe. While it moves along, the hose blasts through the blockage and scours the pipe walls clean.
Where needed, we run a camera through the cleared pipe to check the blockage is fully gone. Since this also spots root damage, cracks, or a loose joint, it catches problems early.
We refit all access covers firmly and clear away any mess left behind. Since you may want to know more, we also advise on your drains' state and any repairs that might help.
The cost of external drain unblocking depends on the length of pipe affected and the type of blockage. Tree root clearance or heavily compacted debris naturally needs more jetting time. However, there's no call-out fee, so request a fast, fixed-price quote online. We confirm all pricing before we start work.
You're usually in charge of private drains within your own boundary. However, shared and public sewers beyond that line belong to Southern Water in the Portsmouth area. If the blockage sits in a shared or public sewer, we can help you report it.
Yes, tree roots are one of the most common causes of blockages in Portsmouth. Roots seek out moisture and can grow through pipe joints and cracks until they block the flow. Since regular CCTV inspections catch root ingress early, they help prevent a full blockage.
Most homes only need one outside drain check and clean each year. However, homes with large trees nearby, or a history of blockages, may need a clean every six to twelve months.
You might also find our guides How to Prevent Blocked Kitchen Drains: A Complete Guide and 7 Warning Signs of a Blocked Drain in Your Property , useful.