A clear, step-by-step guide to fixing a broken sewer. Learn diagnosis, repair methods, testing, pricing, and client handling with practical tips and real numbers.
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When you're called to a property with foul smells, slow drains, or a wet patch in the lawn, you're likely fixing a broken sewer. The work is messy, but the process is simple when you break it down. This guide explains what to check, how to choose a repair method, and the steps to finish cleanly. We’ll cover diagnosis, excavation, pipe repair, testing, and handover. You’ll also see practical numbers you can use on site. Use this as a checklist when you’re under pressure and the clock is ticking.
Fixing a broken sewer starts with diagnosis and safety, then locating and exposing the pipe. Choose the right repair—spot fix, pipe bursting, or lining—based on pipe condition, access, and budget. Replace or rehabilitate the line, test for leaks, backfill in layers, and document the job for sign-off and payment.
Broken sewers show up in simple ways. You’ll see slow drains, foul smells, or ground movement. Indoors, look for gurgling or back-ups at low fixtures.
Start safe. Mark utilities. Use CAT and Genny before digging. Wear gas monitors where needed. Sewers can release dangerous gases in confined spaces.
Confirm the problem. Run a CCTV camera. Dye test if needed. Map the run, depth, and fittings. Note pipe size, material, and any junctions. When fixing a broken sewer, a 30-minute survey can save you a full day later.
Scope the job. Decide if you’re doing a spot repair, a partial replacement, or a full line renewal. Set limits. Note access, trees, and hard surfaces.
Trace the pipe from the stack or the nearest manhole. Use a sonde with your camera and a locator to mark the line.
Dig clean and narrow, but not tight. Leave at least 150 mm clearance each side of the pipe. Keep spoil stockpiled away from the trench edge.
Shore the trench if you’re deeper than 1.2 m or in weak ground. Don’t risk it. Many workers find trench boxes save time and worry.
Expose 300–600 mm beyond the damage each way. Clean the pipe. Confirm the exact break and any cracks or displaced joints.
Pick the method that fits the pipe’s condition and the site.
When fixing a broken sewer under drives or patios, trenchless often wins. When gradients are wrong, open-cut is your friend. Check for junctions and 90° bends. In general, switch 90° to two 45° bends for smoother flow.
Here’s a simple sequence you can follow on most jobs.
A small spot repair is often 3–5 metres of work. Many teams finish this in 1 day. A longer renewal, with reinstatement, can run 2–4 days.
Testing matters. It proves the fix and avoids callbacks.
Follow local standards and your insurer’s guidance. In general, water holds are easier to explain to clients. Keep it simple.
Record everything:
These records protect you. They also help when you price future work.
Internal link opportunities:
Be clear and firm. Clients want to know what’s included and what might change.
When fixing a broken sewer, a solid paper trail reduces disputes. Capture site photos, voice notes, and a sketch. Tools like Donizo let you turn those details into a branded proposal fast with Voice to Proposal. Send it for e‑signature, then convert accepted proposals into invoices in one click.
Talk like a pro, but keep it human. Explain the plan in plain words. Show the options: spot fix vs lining vs full renewal. Give timeframes, like “1 day for a spot repair, 3 days if we replace to the manhole.”
Use CCTV to confirm. Look for cracks, displaced joints, root intrusions, or a collapsed section. Slow drains and smells are clues, but a camera tells you exactly where and how bad it is.
A common range is 1:40 to 1:80. Keep it consistent. Too steep and water outruns solids. Too flat and you’ll get build-ups. Check with a level as you bed the pipe.
It depends. Lining is great for cracks and minor offsets with good access points. It avoids reinstatement costs. If the pipe has collapsed or the gradient is wrong, open-cut replacement is usually better.
A small spot repair often takes 1 day, including reinstatement. A partial renewal or trenchless run can take 2–4 days, depending on length, access, and weather.
Yes. Always test. Run an air or water test for 15–30 minutes. No leaks, no drops. Record results and keep the photos and CCTV for your file.
Fixing a broken sewer is straightforward when you follow a clear process: diagnose, expose, repair, test, and document. Set the right gradient, bed the pipe well, and backfill in compacted layers. Next steps you can take today:
By working this way, you cut risk, reduce callbacks, and finish with confidence.
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