Certified Drainage Experts with Over 50 Years of Experience
AH Drainage is an Auckland-based drainage company specialising in certified drainlaying and drainage solutions for residential, commercial, and public projects. Led by Senior Certifying Drainlayer Allen Harriman, we combine practical expertise with technical precision to deliver reliable, compliant results across every job.
Trusted by Homeowners, Builders & Councils
Practical Experience. Proven Results.
With more than five decades on the tools, AH Drainage has built a reputation for dependable workmanship, professional communication, and a no-nonsense approach to getting drainage work done right. From small residential installs to large-scale developments and public infrastructure, we’re trusted by homeowners, builders, surveyors, and Auckland Council alike for projects that meet every standard — on time and on budget.
Our Story
Built on Experience, Driven by Quality
Founded and led by Senior Certifying Drainlayer Allen Harriman, AH Drainage was established to bring reliability, compliance, and accountability back to the drainage industry. After more than 50 years working across Auckland’s residential, commercial, and public sectors, Allen saw the need for a drainage service that prioritised clear communication, safe practices, and precision workmanship.
Today, AH Drainage continues that commitment — combining hands-on expertise with efficient project management to keep jobs moving smoothly from planning to council sign-off. Our team takes pride in doing the job right the first time — no shortcuts, no guesswork, just certified results you can rely on.
Practical. Compliant. Reliable.
At AH Drainage, we believe quality drainage starts with accountability and ends with results that last. Every project, no matter the scale, is guided by the same principles:
Experience you can trust
Over 50 years of certified drainage expertise
Compliance and safety
All work completed to Auckland Council and Watercare standards
Efficiency and communication
Paperwork handled quickly, and clients kept informed every step
Reliability
We show up when we say we will and deliver work that stands the test of time
From design and installation to inspections and CCC approval, AH Drainage ensures every part of the process runs smoothly and professionally. Our purpose is simple — to provide drainage solutions that perform safely, efficiently, and for the long term.
Talk to Us About Your Project
Whether you’re planning a new build, subdivision, or drainage upgrade, AH Drainage delivers certified results with clear communication and efficient handling of council approvals.