Pipe Relining vs. Full Pipe Replacement: How to Decide

When a drain keeps blocking in the same spot, or a pipe section has visibly failed, the decision isn’t automatically “dig it up.” Pipe relining has become a genuine alternative for a lot of Midrand, Johannesburg and Pretoria properties — but it’s not the right fix for every situation. Here’s how to tell which one actually applies to you.

What Pipe Relining Actually Is

Pipe relining repairs a damaged pipe from the inside, without excavating the ground above it. A flexible liner coated in resin is inserted into the existing pipe, inflated to press against the pipe walls, and cured in place to form a new, smooth pipe within the old one. The result is a structurally sound pipe without digging up a driveway, garden, or foundation to reach it.

What Full Replacement Involves

Traditional replacement means excavating along the pipe’s route, removing the damaged section (or the entire line), and installing new pipe before backfilling and restoring the surface. It’s more disruptive and typically more expensive for the work itself, but it’s sometimes the only option — and in some cases it’s genuinely the better one.

When Relining Is the Right Call

Relining works well when the pipe has cracks, small root intrusions, or general deterioration but hasn’t physically collapsed — the existing pipe still has enough structural integrity to support a liner. It’s especially worth it where excavation would be expensive or disruptive: under a driveway, through an established garden, or beneath a slab. For many Midrand and Johannesburg properties with mature landscaping or paved areas over the problem section, relining avoids thousands of rands in restoration work that excavation would otherwise require.

When Replacement Is Actually Necessary

If a pipe section has fully collapsed, is severely offset at a joint, or has such extensive damage that a liner wouldn’t have sound pipe to bond to, relining isn’t viable — the pipe needs to come out. Severely undersized pipes that need to be upsized for capacity reasons also require replacement, since relining keeps roughly the same internal diameter (minus the liner’s thickness). We’ll tell you plainly if relining isn’t suitable for your situation rather than attempting it anyway.

How We Decide Which One You Need

We run a drain camera inspection first, every time — this is non-negotiable before recommending either option. The camera shows us the exact condition of the pipe: how many cracks, how severe, whether there’s a full collapse, and how much of the line is actually affected. That footage is what the recommendation is based on, not a guess from symptoms alone.

Cost Comparison

Relining is usually less expensive overall once you account for the restoration work excavation requires — no need to relay paving, replant a garden, or patch a driveway. The relining process itself has its own equipment and material costs, so for a short, easily accessible pipe section, the price gap between the two methods can be smaller than people expect. We give you both options with real numbers where relining is viable, so the decision is based on your actual costs, not a blanket assumption that relining is always cheaper.