Blocked Drains in Hornsby & Northern Sydney

Tree roots, grease build-up, or a collapsed pipe — we diagnose the cause with CCTV and clear it with high-pressure water jetting. Same-day service across Northern Sydney.

What Causes Blocked Drains in Northern Sydney

Tree roots are the leading cause of blocked drains in Northern Sydney's established suburbs. Hornsby, Wahroonga, Turramurra and Pymble feature mature gardens with extensive root systems that actively seek out the moisture inside sewer and stormwater pipes, entering through joints, cracks and failed seals.

Other common causes include grease and fat build-up in kitchen drains, foreign objects flushed into the sewer, collapsed or bellied pipes in older properties, and ground movement that shifts pipe alignment. Each cause requires a different treatment — which is why diagnosis before clearing is critical.

CCTV Drain Inspection — See the Problem Before You Fix It

We insert a high-resolution CCTV camera into the drain to see exactly what is causing the blockage, where it is located, and what condition the pipe is in. This is not optional — it is the only way to know whether you are dealing with tree roots, a grease plug, a collapsed section, or a foreign object.

The camera footage is recorded and can be provided to you as part of the job report. It also serves as evidence for insurance claims where pipe damage is involved, and as a baseline for future inspections.

High-Pressure Water Jetting

Our primary clearing method is high-pressure water jetting using a ute-mounted jetter. This equipment delivers water at pressures up to 5,000 PSI through a specialised nozzle that cuts through tree roots, dissolves grease, and flushes debris out of the pipe. It is the most effective drain-clearing method available and does not damage the pipe walls.

For simple blockages in smaller household drains, an electric eel may be sufficient. But for sewer mains, stormwater drains, tree root intrusion, and commercial drains, high-pressure jetting is the correct tool.

Tree Root Removal and Prevention

Cutting tree roots out of a drain solves the immediate blockage, but they will grow back — typically within 12 to 18 months. For a permanent solution, we offer no-dig pipe relining: an epoxy-impregnated liner is inserted into the existing pipe and cured in place, creating a new pipe-within-a-pipe that is jointless and root-proof. Relined pipes carry a design life of approximately 50 years.

Where relining is not suitable (severely collapsed pipes, sharp bends, or very short sections), we excavate and replace the damaged section with new PVC pipe.

No-Dig Pipe Relining

Pipe relining repairs damaged drains from the inside without digging up your yard, driveway or garden. The process involves cleaning the pipe with a jetter, inserting a flexible liner coated with structural epoxy resin, inflating it against the pipe walls, and curing it until it hardens into a smooth, jointless new pipe inside the old one.

The result is a pipe with no joints for roots to enter, a smoother internal surface that resists future blockages, and structural strength that exceeds the original pipe. It is faster, less disruptive and often less expensive than traditional excavation and replacement.

Stormwater and Commercial Drains

Blocked stormwater drains can cause flooding and property damage during heavy rain. We clear stormwater pits, pipes and channels using the same jetting and CCTV equipment as sewer drains.

For commercial properties — restaurants, strata buildings, schools, aged care facilities and industrial sites across Northern Sydney — we provide scheduled drain maintenance programs that prevent blockages before they cause disruption.

Drain Clearing Methods Compared

Different blockage types require different tools. The table below compares the four main methods we use:

Method	Best For	Typical Cost	Permanence	Time on Site
Electric Eel (Drain Snake)	Simple household blockages — hair, soap, minor build-up	$180 – $250	Temporary (clears but doesn't prevent recurrence)	30–60 min
High-Pressure Water Jetting	Tree roots, grease, heavy build-up, sewer mains	$180 – $480+	Effective for 12–24 months (roots regrow)	1–2 hours
No-Dig Pipe Relining	Cracked, root-damaged, or joint-failed pipes	$2,500 – $6,000+ (per section)	Permanent (~50-year design life, jointless)	4–8 hours
Excavation & Pipe Replacement	Collapsed pipes, severe damage, sharp bends unsuitable for relining	$3,000 – $10,000+	Permanent (new PVC pipe)	1–3 days

We always start with CCTV inspection to diagnose the cause before recommending a method. This prevents over-servicing — you only pay for what the pipe actually needs.

Blocked Drain Cost Guide — Northern Sydney

Typical cost ranges for drain clearing in Northern Sydney (GST-inclusive estimates):

Service	Cost Range	What's Included
Drain clearing (electric eel)	$180 – $250	Clear simple blockage, test flow
Drain clearing (high-pressure jetting)	$180 – $480+	Jetting, CCTV inspection, flush test
CCTV drain inspection only	$180 – $350+	Camera inspection, recorded footage, written report
Tree root removal + jetting	$250 – $480+	Root cutting, jetting, CCTV confirmation
No-dig pipe relining (per section)	$2,500 – $6,000+	Pipe cleaning, liner installation, curing, CCTV verification

Source: O'Brien Plumbing cost guide (obrien.com.au). On-site diagnostic included. Fixed prices confirmed before any work starts. 7-year workmanship warranty on labour.

How We Handle Blocked Drains — Our Process

At O'Brien Plumbing & Roofing Hornsby, our blocked drain service is a disciplined, diagnostic-led process built for Northern Sydney properties — from post-war cottages in Wahroonga to high-density strata in Hornsby. We combine CCTV inspection, targeted hydro jetting, mechanical clearing and trenchless pipe relining, moving from least invasive to most invasive while keeping safety, documentation and long‑term outcomes front of mind.

1. Rapid initial response and booking

When you call (02) 9477 1519 we prioritise emergency public health risks and property-damaging issues (sewage overflow, major stormwater backups). Standard bookings are scheduled to suit access windows for heritage homes and strata complexes. We operate 24/7 for emergencies so a blocked sewer or overflowing stormwater drain outside business hours can still get expert attention.

2. On-site diagnostic—what we do first

We observe symptoms (fixtures affected, odour, surface pooling) and isolate the problem area.
We perform a visual site inspection for external clues — saturated lawns, hairline cracks in footpaths, tree lines, roof downpipe connections and inspection chamber access.
We apply pipe locators to pin down the line route and any buried access points. On steep sandstone blocks or complex drainage arrangements common in Northern Sydney, accurate locating avoids unnecessary excavation.
We charge a clear $180 inc GST diagnostic fee for routine attendances. For complex properties or when a full written assessment is requested we proceed to a comprehensive major drainage assessment ($500 inc GST) which includes CCTV and a formal report.

3. CCTV drain inspection (push‑rod and crawler)

CCTV is the backbone of a modern blocked drain response. We deploy push‑rod cameras for domestic lines and crawler cameras for larger mains or collapsed sections. The camera run documents pipe material, joint condition, root intrusion, grease, scale and foreign objects, and it pinpoints exact fault locations and depths.

4. Assessment and treatment plan

After reviewing CCTV footage on-site we provide an immediate recommendation: a quick mechanical clear, hydro jetting, targeted root cutting, or pipe relining. If the problem is structural (collapsed clay or broken joint), we outline options and costs including trenchless relining versus excavation and repair. We will not proceed without your informed authorisation.

5. Clearing and restoration

Mechanical cleaning — electric drain machines and augers for short, soft blockages and foreign objects.
Hydro jetting — high-pressure water cleaning for grease, scale and root intrusion. We use residential hydro units rated 3,000–5,000 PSI and commercial units up to 8,000 PSI where pipes and access permit.
Root removal — specialised root-cutting nozzles and rotary cutters coupled with CCTV monitoring to ensure roots are removed without unnecessary pipe damage.
Post-clear CCTV — we re-run the camera to confirm the line is clean and to check for hidden defects that require relining or repair.

6. Trenchless pipe relining (where required)

For structural defects, broken joints or recurring root intrusion we recommend cured-in-place pipe relining (CIPP). Relining reinstates a new structural lining inside the host pipe without open excavation — a lower-impact solution ideal for steep sandstone blocks, heritage gardens and tight urban sites common in Northern Sydney.

7. Reporting and follow-up

For major drainage assessments ($500 inc GST) we supply a written report with annotated CCTV stills, location depths, recommendations and lifecycle expectations. We document the work performed and provide preventative guidance tailored to the property. We also schedule follow-up CCTV or maintenance if requested.

Signs You Need Blocked Drain Services

Northern Sydney’s older housing stock, mature gardens and steep terrain mean blocked drain symptoms can present in many ways. Early recognition saves money and prevents health hazards.

Slow or gurgling drains — sinks, toilets or showers that drain slowly or gurgle when other fixtures are used.
Repeated backups — toilets, sinks or floor wastes backing up after brief use or during rainfall.
Sewage odours — persistent sewer smells inside the property or around external inspection chambers and drains.
Surface pooling on sloping blocks — water pooling on sandstone slopes or saturated patches in lawns, often a sign of stormwater or sewer line failure.
Unpleasant odour in stormwater pits — trapped debris and blockages in stormwater lines after heavy rain.
Unexplained lush patches in the garden — soggy, unusually green areas can indicate leaking sewer lines feeding soil nutrients to nearby roots.
Recurring blockages after minor clearing — repeated complaints in strata buildings or houses usually indicate structural issues or persistent root ingress.
Visible roots in inspection chambers — direct evidence of tree root intrusion, common with mature gums, eucalypts and camellias in Northern Sydney gardens.
Older pipe materials showing age — copper, galvanised or clay pipes from the 1950s–1970s are at higher risk of scale, corrosion and collapse.

Blocked Drains Cost Guide — Northern Sydney

We aim for transparent pricing so customers know what to expect. O'Brien Plumbing & Roofing Hornsby charges a clear diagnostic fee and offers a major assessment option that includes CCTV with a written report.

Diagnostic attendance: $180 inc GST — covers an initial site visit and diagnosis for standard attendances.
Major drainage assessment (recommended for complex or recurring issues): $500 inc GST — includes a full CCTV drain inspection and a written assessment with recommendations.
Hydro jetting: Quoted based on severity and access — we assess on-site after CCTV. Hydro jetting scope may vary by pipe size, length, degree of root/grease or scale build-up, location challenges (steep blocks or restricted access), and whether the job requires a residential unit (3,000–5,000 PSI) or a commercial-grade unit (up to 8,000 PSI).

Important pricing notes:

Quoted work requires your approval before we commence. Major or complex repairs (relining, excavation) are itemised in the written report for transparency.
For strata or commercial properties we supply scoped proposals that outline multiple options (maintenance vs repair vs replacement) and associated timeframes for minimising service disruption.
Emergency attendances outside standard hours may attract additional call‑out or after‑hours charges — please call (02) 9477 1519 for immediate response and pricing for emergencies.

Residential vs Commercial Blocked Drains

Although the core technologies (CCTV, hydro jetting, relining) are the same, our approach differs substantially between residential and commercial clients to reflect usage, regulatory requirements and access constraints.

Residential

Focus on least invasive solutions — residential properties, especially heritage homes or steep sandstone blocks, are better suited to trenchless relining and targeted hydro jetting.
Smaller-diameter lines — domestic drains are typically 100–150 mm; we use push-rod CCTV cameras and residential hydro jet units (3,000–5,000 PSI).
Garden protection — mature trees and landscaped gardens are common in Northern Sydney; we take extra care with access, using board protection and root-sensitive techniques to avoid unnecessary excavation.
Communication and education — homeowners receive detailed reports, images from CCTV runs and tailored prevention plans (e.g., tree management, grease disposal).

Commercial and Strata

Large-diameter and high-use mains — commercial kitchens, multi-storey strata and retail centres need commercial-grade strategies and more frequent maintenance.
Higher-pressure cleaning — where pipes and manholes are built to commercial standards we may deploy hydro jetting up to 8,000 PSI to remove heavy grease, silt and scale.
Planned maintenance and reporting — we support routine maintenance contracts, scheduled outages and compliance documentation for strata managers and building owners.
Traffic and site management — for commercial sites we manage work windows, safety zones, and permit coordination; our team observes all relevant SWMS and workplace safety requirements.
Minimal disruption — we coordinate off-peak works to avoid business interruption and provide CCTV reporting for building records and insurance purposes.

Prevention Tips for Northern Sydney Properties

Northern Sydney’s mix of mature trees, older pipes and steep, sandstone-filled blocks means prevention is the most cost-effective strategy. Small, consistent actions reduce the likelihood of blocked drains and expensive structural repairs.

Regular CCTV checks — have a CCTV inspection every 2–5 years for older properties or if you see early warning signs. For high-use commercial kitchens or strata blocks, schedule inspections annually.
Avoid planting near lines — when landscaping, keep shallow-rooted plants near sewer lines and avoid deep-rooting species such as eucalypts, figs and poplars near known pipe routes.
Install root barriers — where planting is unavoidable, a physical root barrier (installed along the sewer easement) can deter roots from reaching the pipe.
Grease management — for kitchens (residential and commercial), avoid pouring fats and oils down the drain. Use a household grease can and dispose of fats in general waste or install a grease trap for commercial kitchens.
Gutter maintenance — heavily treed properties in Wahroonga and Thornleigh need regular roof and gutter cleaning to prevent debris entering stormwater systems and clogging downpipes.
Leaf and debris screens — install leaf guards on external pits, stormwater grates and overflow points to reduce blockages from falling leaves and organic matter.
Monitor fixtures — consistent slow drainage in a single fixture can indicate a local issue; multiple slow fixtures often mean a main line problem requiring immediate CCTV inspection.
Protect older pipework — copper, galvanised and clay lines common in 1950s–1970s homes should be inspected more frequently. Relining can extend the life of these pipes without destructive excavation.
Educate tenants and residents — in strata buildings provide simple do’s and don’ts (no wet wipes, sanitary items or cooking fats down the drain) to reduce avoidable blockages.

Technology & Equipment — What We Use and Why It Matters

Modern drain work depends on the right equipment used by experienced teams. O'Brien Hornsby deploys industry-standard tools calibrated for the varied challenges of Northern Sydney.

CCTV drain cameras (push‑rod and crawler)

Push‑rod cameras — ideal for domestic 100–150 mm sewers and stormwater lines. They quickly diagnose blockages, joint failures and root ingress in accessible runs.
Crawler cameras — robust, motorised crawlers for larger diameter pipes, heavily silted runs or collapsed sections. Crawler cameras give stable footage and can negotiate longer runs without a push-rod limit.
Why it matters — CCTV avoids guesswork. Accurate diagnosis reduces unnecessary digging on steep sandstone blocks and helps us provide a targeted, economical solution.

Hydro jetting units

Residential units — 3,000–5,000 PSI, suitable for grease, silt and light root ingress in domestic lines.
Commercial-grade units — up to 8,000 PSI for heavy grease, mineralised scale and industrial silt in larger mains and commercial kitchens.
Why it matters — hydro jetting removes adherent grease and mineral deposits that mechanical augers cannot fully clear, restoring full pipe capacity and reducing reoccurrence.

Electric drain machines and cutting heads

For small blockages and short-root incursions we use electric drain machines and rotary cutting heads. These are effective for removing compacted hair, nappies and localised debris, usually at lower cost than hydro jetting.

Pipe locators and survey equipment

Accurate locating of buried pipes is essential on Northern Sydney sites where sandstone slopes and unusual line runs are common. Our pipe locators prevent unnecessary excavation, protect tree roots we’re not addressing, and speed up relining set-up.

Trenchless relining systems (CIPP)

We use industry-standard cured-in-place pipe (CIPP) relining systems for structural repairs to sewer and stormwater pipes. Relining restores structural integrity, seals hairline cracks and prevents root ingress without full excavation — critical for heritage properties and complex blocks with limited access.

Safety and compliance equipment

All work follows our site-specific safe work method statements (we maintain 17 SWMS across disciplines), confined-space procedures, and industry safety standards. We are licensed, insured and hold a gas fitting licence where required. Our teams carry gas detectors, ventilation equipment and PPE appropriate to the task and environment.

Why Choose O'Brien for Blocked Drains — Northern Sydney

Choosing the right contractor matters for long-term outcomes, particularly in Northern Sydney where complex terrain, heritage homes and mature vegetation are the norm. O'Brien Plumbing & Roofing Hornsby stands apart for several practical reasons:

Dual expertise — we are both plumbing and roofing specialists. That combination is valuable when blocked drains interact with roof drainage, gutters and stormwater systems on steep, treed blocks.
Local base in Hornsby — proximity means faster response times across Northern Sydney suburbs including Wahroonga, Pennant Hills and Brooklyn.
24/7 emergency response — available for urgent public-health or property‑threatening drain failures.
Transparent diagnostic pricing — $180 inc GST diagnostic fee for standard attendances and $500 inc GST for a major drainage assessment with CCTV and written report.
Safety-first culture — we operate under 17 SWMS, are fully licensed and insured, hold a gas fitting licence and are actively pursuing ISO 9001 quality management accreditation.
Advanced technology — we own and operate push-rod and crawler CCTV systems, residential and commercial hydro jetting units (3,000–8,000 PSI), electric drain machines and precision pipe locators.
Experience with Northern Sydney specifics — our teams understand the challenges of sandstone slopes, heritage pipe networks and dense tree canopies, so we recommend the least-invasive, longest-lasting solutions.
Comprehensive reporting — major assessments include annotated CCTV imagery and written recommendations useful for insurance, strata records and future maintenance planning.

Frequently Asked Questions (FAQs)

1. What does the $180 diagnostic fee cover?

The $180 inc GST diagnostic fee covers an on-site attendance to assess the problem, basic observation and an initial recommendation. If the job requires a major drainage assessment or CCTV inspection with a full written report we will move to the $500 inc GST option. We explain the scope and likely costs before proceeding with any additional work.

2. When do I need a major drainage assessment ($500)?

We recommend the $500 inc GST major drainage assessment when the issue is recurring, the property has older pipes or when CCTV footage is necessary to scope structural defects. This includes an in-depth CCTV inspection and a written report outlining defects, proposed solutions (including relining options) and lifecycle expectations.

3. Will hydro jetting damage old clay or galvanised pipes?

Hydro jetting is a powerful and effective cleaning method. Before using it, we review CCTV footage and the pipe material. For fragile or severely degraded pipes, we may opt for gentler mechanical clearing or proceed with extreme care, or recommend relining instead of aggressive jetting. Hydro jetting settings are graded to pipe condition; residential units (3,000–5,000 PSI) are typically safe for most domestic pipes when operated by experienced technicians.

4. Can pipe relining fix collapsed clay pipes?

Relining is excellent for sealing broken joints, sealing hairline fractures and reinstating structural integrity in many damaged pipes. However, if a pipe has fully collapsed or the host pipe has major voids, full excavation may be the only safe option. Our CCTV assessment identifies whether relining is viable and we provide straightforward advice and alternatives.

5. How long does a relined pipe last?

Cured-in-place relining installed correctly and in the right conditions is designed to provide decades of service. The exact lifespan depends on traffic load, soil conditions and the type of host pipe. Our major drainage assessment includes expected lifecycle information for informed decisions.

6. How soon can you attend for an emergency blocked drain?

We operate a 24/7 emergency service for critical blockages that risk health or property. Response times vary with location and current workload, but being based in Hornsby allows us to respond quickly across Northern Sydney. Call (02) 9477 1519 and we prioritise accordingly.

7. What can I do immediately to reduce damage before you arrive?

Stop using fixtures that are affected, avoid running washing machines or dishwashers that may exacerbate backups, and close outdoor taps feeding the stormwater/surface drains if safe to do so. Do not attempt to pour drain cleaners — these can damage pipes and are often ineffective on structural blockages.

8. Do you provide maintenance plans for strata or commercial properties?

Yes. We provide tailored maintenance programs including scheduled CCTV inspections, grease trap servicing, and planned hydro jetting to prevent outages. Maintenance plans include reporting suitable for strata managers and facility teams to meet compliance and asset management needs.

9. Will you excavate my garden if there’s a blocked drain?

We always prefer non-invasive solutions first. CCTV and relining allow us to repair many issues without excavation — crucial for heritage gardens and steep sandstone sites common in Northern Sydney. If excavation is required, we discuss the extent, costs, and remediation plans with you before proceeding.

10. How do you manage safety on steep or heritage properties?

Our teams work under site-specific SWMS (we maintain 17 SWMS) and apply risk controls for fall protection, equipment stability and protection of historical fabric. We coordinate with owners and strata managers and obtain any necessary permits before intrusive work.

Service Areas — Northern Sydney

Operating from our Hornsby base, we cover blocked drain services across Northern Sydney with an emphasis on local knowledge and rapid response. Call (02) 9477 1519 to discuss your location or to arrange an inspection.

Hornsby — Central hub for our operations, handling a mix of new developments and older homes with steep blocks.
Berowra — Properties often have mature bushland and root-pressure issues; access challenges are common.
Mt Colah — Residential streets with established trees and older plumbing systems requiring regular CCTV checks.
Asquith — Combination of heritage and newer homes; frequent stormwater challenges on slopes.
Waitara — Proximity to commercial strips and strata buildings that need planned maintenance.
Normanhurst — Family homes with large gardens and potential for root intrusion from mature trees.
Thornleigh — Mix of steep blocks and older pipes; careful locating and relining are often the best solutions.
Pennant Hills — Sloping sandstone sites with complex drainage layouts and heritage considerations.
Wahroonga — Large, mature properties and heritage homes; priority on non-destructive methods and garden protection.
Brooklyn — Semi-rural and riverside properties with stormwater considerations and access challenges.
Surrounding Northern Sydney suburbs — we extend services across adjacent areas from Hornsby, tailoring the approach to local site conditions.

For a reliable, documented and technically sound approach to blocked drains in Northern Sydney, contact O'Brien Plumbing & Roofing Hornsby on (02) 9477 1519. Our team will arrange a clear diagnostic pathway — starting with a $180 inc GST attendance — and will explain whether a $500 major drainage assessment with CCTV and written report is the right next step for your property. We combine plumbing and roofing expertise, advanced equipment and a safety-first culture to deliver long-term outcomes that protect your home or business.

Frequently Asked Questions

What is the most common cause of blocked drains in Northern Sydney?

Tree roots are the leading cause. Northern Sydney's established suburbs feature mature gardens with extensive root systems that actively seek out moisture inside sewer and stormwater pipes.

Do you use chemicals to clear blocked drains?

No. We use professional high-pressure water jetting — it is more effective than chemicals, does not damage pipes, and does not introduce harmful substances into the sewer system.

What is pipe relining and how long does it last?

Pipe relining creates a new pipe inside the old one using structural epoxy resin, without digging. It is jointless (so roots cannot re-enter) and carries a design life of approximately 50 years.

Which Northern Sydney suburbs do you service?

We cover Hornsby, Wahroonga, Turramurra, Gordon, Pymble, Asquith, Mt Colah, Berowra, Brooklyn, Thornleigh, Pennant Hills, Cherrybrook, Galston, Dural and surrounding areas.

Do you offer scheduled drain maintenance for businesses?

Yes. We provide preventative drain maintenance programs for commercial properties — regular CCTV inspections and jetting to prevent blockages before they cause disruption.

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Blocked Drain? We'll Clear It Today.

CCTV inspection and high-pressure jetting. Same-day service across Northern Sydney.