Finding the best drainage contractors in Invercargill starts with knowing whether your job is a blocked drain, a new house connection or a paddock that will not drain. A certified drainlayer in Invercargill can clear and repair sewer and stormwater lines, install driveway sumps and street connections, and design effluent fields and farm drainage for Southland’s wet ground. Specialists such as Discount Drainage and Arnott Drainage handle residential and commercial work, while civil firms take on rural and subdivision drainage.
1Discount Drainage
Discount Drainage is a local Southland drainage company owned and operated by Phil White, a certified drainlayer with 30 years’ experience across the drainage industry. The business covers new drainage for building projects as well as repairs and maintenance on existing drains, for homes, commercial sites and rural properties around Invercargill and Southland.
Services
- Residential, commercial and rural drainage
- Drain unblocking
- Driveway sumps and street connections
- Effluent field maintenance
- Nova Flo drainage
Highlights
- Owner Phil White is a certified drainlayer
- 30 years’ experience in the drainage industry
- Practical problem solving for drainage issues tied to building consents
- Section clearing available alongside drainage work
Location & Contact
Name: Discount Drainage
Address: Invercargill
Phone: 021 223 4553
Website: discountdrainagesouthland.co.nz
2Arnott Drainage
Arnott Drainage is a locally owned drainlaying business based on Earn Street in Invercargill, working for residential and commercial clients across the region. Its team includes certified drainlayers who handle new drainage installations, repairs and ongoing maintenance, with work kept compliant with current regulations.
Services
- New drainage installations
- Drain repairs
- Drain maintenance
- Residential and commercial drainlaying
Highlights
- Certified drainlayers on the team
- Member of Master Drainlayers
- Locally owned and operated
Location & Contact
Name: Arnott Drainage
Address: 30 Earn Street, Invercargill
Phone: 027 456 9699
Website: arnottdrainage.nz
3PBS Plumbers and Building Services
PBS Plumbers and Building Services is a multi-trade firm in Grasmere with a dedicated drainlaying team that designs and installs drains and residential effluent systems. It works on water drainage and collection systems, septic tanks and stormwater for residential and commercial properties across Southland, Otago and the Lakes District.
Services
- Drain design and installation
- Residential effluent systems and septic tanks
- Stormwater and water collection systems
- Drain investigation and unblocking
- Repair or replacement of damaged pipework
Highlights
- Three diggers with trained operators
- Drain clearing truck and hydro equipment
- Plumbing, gasfitting and electrical in the same firm
- Second branch in Arrowtown serving the Lakes District
Location & Contact
Name: PBS Plumbers and Building Services
Address: 20A Bay Road, Grasmere, Invercargill 9810
Phone: 03 215 7077
Website: pbsnz.com
4AG Hoffman Civil
AG Hoffman Civil is an Invercargill civil contractor on Basstian Street that specialises in civil drainage, farm drainage, subdivisions and rural development. The team uses laser grading to design and cut farm drains, installs perforated drainage pipe and handles underground services such as sewer and stormwater mains, suiting farmers, developers and industrial clients rather than household blocked drains.
Services
- Laser-graded farm drainage
- Perforated pipe installation
- Sewer and stormwater mains
- Effluent disposal systems
- Earthworks and containment ponds
Highlights
- Stock underpass specialists since the late 1990s, with at least 30 installed
- Gold SiteWise safety certification
- Owned and managed by Grant Hoffman, Dale Hoffman and Chris Parkes
- Help with the design phase and detailed quotes
Location & Contact
Name: AG Hoffman Civil
Address: 27 Basstian Street, Invercargill
Phone: 027 223 8838
Website: aghoffmancivil.co.nz
5Rohan Mahon Plumbing & Drainlaying
Rohan Mahon Plumbing & Drainlaying is an Invercargill plumbing and drainlaying business started in 2014 by Rohan Mahon, a certified craftsman plumber and certified drainlayer. Drainlaying is one of its core services, with attention to falls, pipe sizing and council requirements on new builds, and the small team works from Invercargill out to Riverton, Winton, Gore, Te Anau and Queenstown.
Services
- Drainlaying for new builds and renovations
- Effluent field installation
- Oasis Clearwater sewage treatment systems
- Concrete water tank supply and installation
- CCTV drain inspections, coordinated with specialist contractors
Highlights
- Owner is a certified craftsman plumber and certified drainlayer
- Team member qualified as a tradesman plumber and drainlayer
- Free quotes
- Underfloor and radiator heating also installed
Location & Contact
Name: Rohan Mahon Plumbing & Drainlaying
Address: Invercargill
Phone: 027 535 0440
Website: rmplumbing.co.nz
Drainage Contractors in Invercargill at a Glance
| Business | Highlight |
|---|---|
| Discount Drainage | Owner Phil White is a certified drainlayer |
| Arnott Drainage | Certified drainlayers on the team |
| PBS Plumbers and Building Services | Three diggers with trained operators |
| AG Hoffman Civil | Stock underpass specialists since the late 1990s |
| Rohan Mahon Plumbing & Drainlaying | Owner is a certified craftsman plumber and certified drainlayer |
How to Choose the Right Drainage Contractor in Invercargill
- Check the person doing the work is a registered drainlayer, as drainlaying on sanitary drains is restricted work in New Zealand.
- Match the contractor to the job: a blocked drain or sump needs different gear from a new build connection, an effluent field or farm drainage.
- Ask whether they use CCTV cameras or hydro jetting to find the problem before digging.
- For rural work, look for experience with laser-graded drains, perforated pipe and effluent disposal on Southland soils.
- Confirm who handles the building consent and the as-built plan for council, and get a written quote before work starts.
Frequently Asked Questions About Invercargill Drainage Contractors
Do I need a registered drainlayer for drainage work in Invercargill?
Yes. Sanitary drainlaying is restricted work in New Zealand and must be done or supervised by a person registered with the Plumbers, Gasfitters and Drainlayers Board. You can check a drainlayer’s registration and licence on the Plumbers, Gasfitters and Drainlayers Board website.
What is the difference between a drainlayer and a plumber?
A plumber works on the water supply and sanitary pipes inside and around a building, while a drainlayer installs and repairs the drains underground that carry wastewater and stormwater away to the council connection, septic tank or effluent field. Many firms hold both registrations.
Does new drainage need a building consent?
Most new drainage, changes to existing drains and new septic or effluent systems need a building consent. The Invercargill City Council handles consents for the city, and your drainlayer can usually prepare the drainage plans and as-built drawings.
How do contractors find the cause of a blocked drain?
Drainage contractors in Invercargill commonly use water blasting or hydro jetting to clear blockages and a CCTV drain camera to find cracks, tree roots and collapsed pipe without digging. The camera footage shows whether a repair or replacement is needed.
Who handles farm and rural drainage in Southland?
Farm drainage is usually handled by civil contractors with laser grading equipment, who design the fall of each drain and lay perforated pipe, sometimes with gravel or straw over the pipe to improve drawing. Rural drainlayers also install septic tanks and effluent fields for homes off the town sewer.
How much does a drainlayer cost in Invercargill?
Pricing depends on the length of drain, digging depth, access and whether a consent is needed, so most drainlayers quote per job after a site visit. A blocked drain callout is usually charged by the hour, while new drainage is priced as a fixed quote.
Can I find a drainlayer near my part of Invercargill?
Most drainage contractors travel across the whole city and wider Southland, so location matters less than the type of work. Businesses on this page are based in areas such as Grasmere and central Invercargill, and some also travel out to towns such as Riverton, Winton and Gore.
How We Chose the Best Drainage Contractors in Invercargill
Every business in this guide was found by searching for drainage contractors in Invercargill, then checked against what the business publishes itself: its own website, or where it has none, its official social or booking page. Names, addresses and phone numbers come from those pages rather than a directory feed, so what you see here is what the business says about itself. We also check that each one is still trading and is actually based in or genuinely serving Invercargill, rather than a national operator running a local landing page. A business we can’t confirm from its own pages is not listed.