Highly Productive Land (HPL) Assessments

Landowners, Planners & Surveyors - Need help with HPL Assessments?

If you have clients looking to develop or subdivide Highly Productive Land (HPL) and require an HPL assessment as part of their consent application, Perrin Ag has the expertise to support you.

Since the National Policy Statement for Highly Productive Land (NPS-HPL) came into effect in October 2022, Perrin Ag has delivered over 30 HPL assessments for developments and subdivisions across the Waikato, Bay of Plenty, and Manawatū.

Our team brings extensive knowledge and experience in navigating the complexities of the NPS-HPL across various districts. We also have a strong track record of developing and peer-reviewing reports for councils. Perrin Ag has recently provided testimony on HPL cases in the Environmental court.

Why Partner with Perrin Ag?

For landowners, surveyors and planners, working with Perrin Ag for your HPL Assessment offers key advantages:

HPL assessments
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If you're working on a project requiring an HPL assessment, we’re here to make the process straightforward. Get in touch to learn more.

Our HPL Assessment consultants

Alastair MacCormick

Principal Consultant

Sam Gray

CONSULTANT

Duncan Walker

DIRECTOR
PRINCIPAL CONSULTANT

Roz Hensman

SENIOR CONSULTANT

Alastair MacCormick

Principal Consultant

BSc, MIRPNZ, ASNM

Following University, Alastair travelled and worked extensively through Africa before taking up agricultural flying in Australia. After 10 years dodging trees, power lines and the odd cattle beast in the exhaustive heat of the Australian outback, he returned to New Zealand and took a role with the Bay of Plenty Regional Council. Unwittingly entering the early stages of the water quality conundrum, Alastair spent the next 12 years working between science, policy and implementation, striving to find innovative solutions that enabled farming within environmental constraints. Alastair joined Perrin Ag in 2018 and works across the water quality space which ranges from the grass roots level with farmers wanting to continue to improve the environmental outcomes from their properties, through to how government can actually implement policy frameworks.

When he isn’t working Alastair enjoys renovating, boating and adventures with his wife and daughters.

“I enjoy working with farmers and feel for them during this time of rapid and difficult change. I believe that change is inevitable and necessary but strive to ensure it occurs in a manageable and intelligent way.”

Sam Gray

Consultant

BAppSc(Hons), MIRPNZ, ASNM

Sam grew up on a dairy farm in the Far North. After graduating from the University of Otago in 2005 with an Honours degree in molecular biotechnology, he spent several years working in medical research in New Zealand and Scotland. Upon returning to New Zealand in 2012, he spent four seasons dairy farming in Northland before purchasing a 56 ha block in Taupо̄, where he was first exposed to farming under a nitrogen cap. Sam joined Perrin Ag in 2023 and brings his strong analytical skills that are grounded by a pragmatic approach to problem solving. Outside of farming and consultancy, you’ll likely find him fly fishing, hunting or snowboarding.

“A lot of farmers feel overwhelmed in the face of a rapidly changing regulatory landscape. I strive to help farmers understand what these environmental regulations mean for their business, and offer practical solutions that allow them to keep doing what they do best, whilst remaining compliant”.

Duncan Walker

Director
Principal Consultant

BApplSc, MIRPNZ (Reg), ASNM

Coming from a drystock and dairy farming background, Duncan has always been passionate about growing primary sector businesses. Whether it’s pastoral farming, forestry, horticulture or investments outside the farm gate, sustainably optimising business performance is Duncan’s passion. After graduating from Massey University with a Bachelor of Applied Science in Agribusiness, Duncan’s first opportunity to optimise a farm business was by undertaking a dairy conversion. Duncan project managed the conversion and continued to run the dairy farm for a further three years.

Since joining Perrin Ag in 2011 Duncan works with a wide range of clients including those ‘outside the farm gate’. With his strong background in investment analysis, business strategy and project management, Duncan is increasingly working with clients to analyse and integrate horticulture and forestry investments into their farm businesses.

“I enjoy helping clients navigate through the complexities of today’s operational, financial and environmental challenges. Seeing clients achieve their goals is very rewarding”

Roz Hensman

Senior Consultant

BAppSc(NRM), AdvCert(Nutrient Management)

Roz grew up on a hill country sheep and beef property near Wairoa, Hawkes Bay, before her family relocated to Palmerston North. Her connection to agriculture has been a lifelong journey, with family ties to sheep, beef, and dairy farming across Hawkes Bay and Manawatū.

Roz brings extensive expertise in natural resource management, sustainable land use, and freshwater planning to Perrin Ag. She is passionate about making the regulatory and compliance landscape easier for landowners to navigate, combining her deep understanding of soils and land management with a collaborative and respectful approach to consulting.

Joining Perrin Ag was a natural choice for Roz, who values the business’s holistic, team-based approach and its focus on delivering innovative solutions across a wide range of projects, from on-farm consulting to strategic engagements with local and central government.

When Roz isn’t working, you’ll find her enjoying the great outdoors, whether it’s gardening, tramping, or mountain biking with her family and friends. She also runs a successful family and wedding photography business.

“I love listening to landowners share their knowledge and insights about their land. Respecting their expertise is the key to creating solutions that work for them and their operations. At Perrin Ag, I’m proud to contribute to a team that’s committed to sustainable success for both land and people.”

Lee Matheson

Managing Director
Principal Consultant

B.Appl.Sc (Hons), FIRPNZ (Reg)

Lee came to agribusiness consultancy via the unlikely pathway of a suburban Wellington upbringing, an Honours degree in plant science and a six-year career in the financial markets. In his role as the firm’s MD, Lee doesn’t get out on-farm as much as he used to but makes the most of it when he does. While having swapped the paddock for the boardroom, Lee continues to provide advice in the areas of farm business strategy, farm system innovation, corporate governance, investment analysis and economic research.

Outside of Perrin Ag, Lee loves to spend his time coaching rugby, watching his three kids play sport and gardening with his wife Haidee.

“I love the challenge of empowering people in our primary sectors and the excitement of seeing clients achieving their aspirations. If we can encourage farmers to engage with their consumers, take a more active involvement in their supply chains and view their businesses through a wider lens, then I think our industries have a great future.”

Joel Hensman

Senior Consultant

BApplSc(Ag), MIRPNZ, ISNM

Joel’s interest in agriculture began with his upbringing on a 1,000-hectare block of Kereru Station backing onto the Ruahine Ranges. Joel went on to earn a Bachelor of Ag Science at Massey University, laying the foundation for a career in the primary sector. On the back of a farming career and with over 12 years of professional experience, Joel joined Perrin Ag in 2024.

Joel’s ability to think outside of the box and empower others to learn and grow, means that he is well equipped to manage farm supervision and strategic planning. He has previously been involved with enhancing and supporting Māori led organisations through major development farm supervision projects.

Outside of the workplace, Joel is a family man at heart and enjoys activities like mountain biking, tramping, and hunting. Living in a modest ‘tiny house’ and running a small farm operation, Joel is passionate about growing great food and helping people understand where their food comes from – all while keeping his boots dirty.

“I help our clients step out of their daily realm and look at things through a broader lens. I am acutely aware of the mental health challenges facing our industry and the need to maintain the sustainability of our land and our people. We want farm practices that ensure long-term success without compromising farmers’ well-being.”

Chaylee Thomson

Executive Assistant

Chaylee’s roots are in the Bay of Plenty, where she grew up on a lifestyle block, sparking her lifelong connection to the region. Now based in Rotorua, she plays a crucial role in supporting our Managing Director, Lee Matheson, by helping him facilitate the seamless integration of people and projects both behind and beyond the farm gate.

With over a decade of experience as an Executive Assistant and Office Manager, Chaylee is a highly organised and competent professional. She excels in relationship building, time management, and problem-solving. Her diverse career spans several sectors, including education, government, and iwi, with seven years of experience working in Parliament for NZ First.

Outside of work, Chaylee leads an active lifestyle. She enjoys spending time outdoors, going for walks, working out at the gym, and cherishing moments with her young daughter.

“I was drawn to Perrin Ag because of the passionate and dedicated team. Working with such an enthusiastic group is both inspiring and motivating.”

Michael Booth

Senior Consultant

BCom Af (FM)

Mike brings a wealth of agri-tech and dairy systems expertise to Perrin Ag. After graduating with a Bachelor of AgriCommerce from Massey, he started his career with DairyNZ as a consulting officer where he ran discussion groups and managed farm supervision.

He left DairyNZ to travel the world but within a few months Covid hit, the borders closed, and Mike and his wife Nikita returned home. Back in New Zealand, he took up a role managing DairyNZ’s monitor farms on the Hauraki Plains before joining Halter.

After finishing his OE, he returned home to live in Papamoa and joined the Perrin Ag team in February 2024.

“I’m not someone who likes to sit still and I like to be continually learning. I saw an opportunity with Perrin Ag. As a business their ethos is about continuous improvement and learning. There are always new and better ways of doing things and we need to be at the forefront of that for our clients.”

Abbey Dowd

Consultant

BAgSc (Hons), MIRPNZ, ASNM

Abbey joined Perrin Ag in February 2023 as part of the firm’s graduate recruitment programme, Empower.

Abbey grew up surrounded by dairy farms in a close-knit community in South Waikato. She saw first-hand how local farmers supported her community, which is what inspired her to study at Lincoln University.

Growing up in a rural community Abbey has always been impressed by how much local farmers contribute to the community. She wanted to help give back to the industry and play a part in helping our primary sector continue to produce quality food in a sustainable way.

In 2022, Abbey spent the summer as an intern on one of New Zealand’s first commercial deer milking operations. Her Honours project was researching deer milk alongside other more traditional milking operations and assessing the deer milking industry’s future production possibilities.

Abbey is currently on sabbatical leave until the end of 2025.

“Growing up I didn’t live on a farm, but I always knew I wanted to work in the farming sector. I wanted a role where there was a balance between working on and off farm and where I could support farmers to get the best out of their businesses.”

Danni Armstrong

Finance administrator

Danni grew up on a life style block in Atiamuri and spent five seasons as a relief milker in the area. During this time, her full time roles were in various fields including the rental car, health care and marine industries. Danni has had a focus on administrative and accounting duties, but is also proficient in looking after customers especially well, social media and website operation, running a rental car fleet and the associated tasks like training, rosters, H&S and organising repairs! Danni joined Perrin Ag in May 2021, to be part of a business in an industry she is passionate about.

During her spare time Danni can be found reading a book with her cats or out enjoying the walks in Rotorua’s Redwoods.

“What motivates me each day is knowing that I will be challenged with a range of problem solving tasks. I love to see all the figures adding up and knowing that my role makes a difference to the team.”

Lee Matheson

Managing Director
Principal Consultant

BApplSc (Hons), FIRPNZ (Reg), ASNM

Lee came to agribusiness consultancy via the unlikely pathway of a suburban Wellington upbringing, an Honours degree in plant science and a six-year career in the financial markets. In his role as the firm’s MD, Lee doesn’t get out on-farms as much as he used to but makes the most of it when he does. While having swapped the paddock for the boardroom, Lee continues to provide advice in the areas of farm business strategy, farm system innovation, corporate governance, investment analysis and economic research.

Outside of Perrin Ag, Lee loves to spend his time coaching rugby, watching his three kids play sport and gardening with his wife Haidee.

“I love the challenge of empowering people in our primary sectors and the excitement of seeing clients achieving their aspirations.  If we can encourage farmers to engage with their consumers, take a more active involvement in their supply chains and view their businesses through a wider lens, then I think our industries have a great future.”