Written by the BuildHub research team · Last updated 17 July 2026 · Advertising disclosure
Wellington is hard country for drains. Steep sections in Karori and Brooklyn, century old earthenware pipes under Newtown and Island Bay, tree roots, slips and southerlies that dump a month of rain in a weekend. When drainage fails here it fails expensively, and the law is clear that most of the fix is restricted work for a certified drainlayer. This guide shortlists who to call, what it costs in 2026, and how to keep quotes honest.
The best drainage contractor in Wellington is Wellington Drainage Contractors, a full service crew covering drainlaying, drain unblocking, stormwater, excavation, earthworks and retaining walls across Wellington, Lower Hutt, Upper Hutt, Porirua and Kapiti, with free estimates for residential and commercial work. For an owner operated alternative in the Hutt Valley, Double Dz Drainage is a qualified one crew outfit, and for straight unblocking, Leslie Drain Clearing covers the whole region.
Summary
A standard drain unblock in Wellington runs roughly $150 to $400 in business hours in 2026, a CCTV inspection $250 to $500, and a dig up repair $1,500 to $5,000, with full drain replacement on an older section commonly $8,000 to $20,000 or more. All figures indicative.
Most sewer and stormwater work is restricted: it must be done or supervised by a certified drainlayer under the Plumbers, Gasfitters, and Drainlayers Act, and new or altered drains generally need building consent.
We shortlisted Wellington operators on qualification, genuine drainage focus and regional coverage, from full service contractors down to owner operated crews who answer their own phones.
The shortlist
Our research covered the Wellington drainage market from civil contractors to one van drain clearers. We weighed qualifications, the split between drainlaying and unblocking work, and coverage from the south coast to Kapiti. Some businesses featured on BuildHub may have a commercial relationship with us. See the disclosure at the bottom of this page, and always get at least two quotes.
One tip before the shortlist: for anything beyond a simple blockage, pay for a CCTV inspection before you accept a repair quote, and ask for the footage. A recorded fault at a known depth turns a vague day rate estimate into a fixed price job, and it stops you paying to dig up the wrong end of the pipe.
Editor's Choice 2026
#1
Wellington Drainage Contractors
Wellington Drainage Contractors covers the full span of drainage and site work in one crew: drainlaying, drain unblocking, stormwater, pipe laying, excavation, earthworks, civil construction and retaining walls. That range matters on Wellington sections, where a failed drain often sits under a retaining wall or a sloping driveway and the repair is really three trades in one. One contractor for the dig, the pipe and the reinstatement means one quote and no gaps between responsibilities.
Areas served: Wellington, Lower Hutt, Upper Hutt, Porirua and Kapiti
Double Dz Drainage is an Upper Hutt based, owner operated crew run by qualified drainlayer Devon Macdonald, covering the Hutt Valley and the wider Wellington region. The work spans drainlaying, unblocking, CCTV inspections and drainage for new builds. With a one crew outfit the person quoting the job is the person digging it, which keeps accountability simple.
Areas served: Upper Hutt, the Hutt Valley and wider Wellington
Focus: Drainlaying, unblocking, CCTV inspections, new build drainage
Website: doubledzdrainage.co.nz
Key facts and services
Owner operated by a qualified drainlayer
Single crew, so the quoter and the digger are the same person
Covers new build drainage as well as repairs
#3
Mike Luff Contractor
Mike Luff Contractor, trading as The Drain Specialist, is a certified drainlayer with almost 30 years of experience in drain laying, unblocking, inspections and repairs across the Wellington region. Three decades of local work means a mental map of Wellington's old earthenware networks that no CCTV van can replace, and it shows in diagnosis speed.
Areas served: Wellington City, Lower Hutt, Upper Hutt, Petone, Porirua and Tawa
Focus: Drain laying, unblocking, inspections and repairs
Website: thedrainspecialist.co.nz
Key facts and services
Certified drainlayer
Almost 30 years working Wellington drains
Positioned on affordable repair and unblocking work
#4
Leslie Drain Clearing
Leslie Drain Clearing does what the name says: unblocking and fixing drains for residential, rural and commercial properties across Wellington, the Hutt Valley, Porirua and Kapiti. For a blocked gully trap or an overflowing downpipe you want a clearing specialist, not a civil contractor, and this is that call.
Areas served: Wellington, Hutt Valley, Porirua and Kapiti
Focus: Drain unblocking and drain repairs
Website: lesliedrainclearing.co.nz
Key facts and services
Specialist in clearing and fixing blocked drains
Covers residential, rural and commercial properties
Works the full region from the south coast to Kapiti
#5
Complete Plumbing Solutions
Complete Plumbing Solutions is a Hutt Valley plumbing business whose drainlaying arm covers Lower Hutt, Upper Hutt and Wellington, alongside drain unblocking. A combined plumbing and drainlaying outfit earns its keep when the fault sits at the boundary between the two trades, a blocked sewer that turns out to be a broken gully trap, because one business holds both licences and the job never gets handed off.
Areas served: Lower Hutt, Upper Hutt and Wellington
Focus: Drainlaying and drain unblocking alongside general plumbing
Website: completeplumbingsolutions.co.nz
Key facts and services
Plumbing and drainlaying under one roof
Useful when the fault sits between the plumbing and the drains
Hutt Valley based with Wellington coverage
What does drainage work cost in Wellington?
Drainage pricing splits into diagnosis, clearing and repair, and the repair end varies enormously with depth, access and ground conditions. Realistic Wellington ranges for 2026, all indicative:
Job
Indicative 2026 cost
Standard drain unblock, business hours
$150 to $400
After hours or weekend callout
$300 to $600
CCTV drain inspection
$250 to $500
Drainlayer hourly rate
$120 to $150 per hour
Dig up and repair a broken section
$1,500 to $5,000
New drainage, per metre laid
$200 to $400
Full drain replacement, older section
$8,000 to $20,000+
What pushes Wellington quotes up: depth, steep or terraced access where an excavator cannot reach, concrete and paving over the pipe line, and reinstatement of driveways or retaining structures afterwards. Hand digging on a hillside section can double the labour on an otherwise simple repair.
Money saving tipIf a blockage keeps returning in an older home, stop paying for repeat clears and get a CCTV inspection with a written report. Recurring blockages usually mean roots or a displaced joint, and one fixed price repair is cheaper than a clearing callout every few months.
Certified drainlayers, consent and who owns which pipe
Restricted work: most sanitary drainage work must be carried out or supervised by a certified drainlayer under the Plumbers, Gasfitters, and Drainlayers Act 2006. Check anyone quoting on the Plumbers, Gasfitters and Drainlayers Board public register before they dig.
Consent: new drains and alterations to existing drainage generally need building consent, while some like for like repairs are exempt under Schedule 1 of the Building Act. Your drainlayer should tell you which side of the line the job falls on, in writing.
Public versus private: in the Wellington region the public water, wastewater and stormwater networks are managed on behalf of the councils, but the private drains on your property, up to the connection point, are your responsibility. Establishing where the fault sits is the first question a CCTV inspection answers, and it decides who pays.
Trench safety: excavation is dangerous work, and trenches of 1.5 metres or deeper require shoring or other protection under WorkSafe excavation guidance. A contractor who shrugs at trench protection is telling you something about the rest of their work.
How to compare drainage quotes
Diagnosis first, quote second. A repair quote without CCTV footage or at least a located fault is a guess. Pay for the inspection separately if you have to, and keep the footage.
Fixed price or day rate, stated plainly. Ground conditions make drainage the classic variation trade. If it is a day rate, get the rate, the crew size and a realistic duration in writing.
Reinstatement included? Backfill, compaction, concrete, lawn and any retaining work. The dig is half the job on a Wellington section, and cheap quotes often stop at the backfill.
Consent and paperwork handled. If the job needs building consent or a connection approval, confirm who lodges it and whose price includes the fees.
Registration checked. Take two minutes on the PGDB register. Unqualified drain work can void insurance and will haunt the property file when you sell.
Once the water is going where it should, the slab or driveway comes next. Our Wellington concrete contractors guide shortlists the crews who pour on the capital's slopes.
Frequently asked questions
How much does it cost to unblock a drain in Wellington?
As of 2026, a standard residential drain unblock in Wellington costs roughly $150 to $400 during business hours, depending on the blockage location and whether machine cutting or water jetting is needed. After hours and weekend callouts typically run $300 to $600. If the blockage keeps returning, budget $250 to $500 for a CCTV inspection to find the underlying fault. These are indicative figures: confirm pricing when you book.
Do I need a certified drainlayer in Wellington?
For most sewer and stormwater drain work, yes. Sanitary drainlaying is restricted work under the Plumbers, Gasfitters, and Drainlayers Act 2006 and must be done or supervised by a certified drainlayer. You can check any tradesperson on the Plumbers, Gasfitters and Drainlayers Board public register. Simple drain clearing does not require certification, but repairs, alterations and new drains do, and unqualified work can cause problems with insurance and council records.
Who is responsible for a blocked or broken drain, me or the council?
It depends where the fault sits. Private drains on your property, up to the point where they connect to the public network, are the property owner's responsibility to maintain and repair. Faults in the public main are the network operator's problem. A CCTV inspection establishes the fault location, which is why it is worth doing before you accept any repair quote: if the fault is in the public line, report it rather than paying to fix it.
Why do Wellington drains fail so often?
Age and ground movement, mostly. Large parts of Wellington's older suburbs still run on earthenware pipes laid many decades ago, and the joints in those pipes are easy targets for tree roots. Add steep sections, slips, seismic movement and heavy southerly rain events, and displaced joints and cracked sections are common. Older homes in suburbs like Newtown, Island Bay and Karori are prime candidates for a precautionary CCTV inspection when buying.
Do I need building consent for drainage work in Wellington?
New drains and alterations to your existing drainage layout generally require building consent, while some like for like repairs to existing drains are exempt under Schedule 1 of the Building Act 2004. Connections to the public network need approval too. A certified drainlayer deals with this routinely and should state in the quote whether consent applies and who is lodging it. Keep the paperwork: it goes on the property file and matters at sale time.
What is a CCTV drain inspection and is it worth it?
A CCTV inspection runs a camera through your drains to locate faults, typically costing $250 to $500 in Wellington in 2026. It shows exactly what and where the problem is: roots, a displaced joint, a crushed section, or a fault in the public line that is not yours to fix. For any repair beyond a simple blockage it usually pays for itself, because it converts an open ended dig into a fixed price job at a known location. Always ask for a copy of the footage or report.
Ready to get quotes?
Start with our top pick, Wellington Drainage Contractors, then get at least one more quote to compare.
Disclaimer: This guide is general information, not professional advice. Pricing figures are indicative and vary by project. Rely on written quotes. Some businesses featured on BuildHub may have a commercial relationship with us; this does not change the factual information we publish about any business, and we encourage readers to get at least two quotes. Verify business details directly with each company before engaging them.