Due Diligence / Expert Witness


Our clients turn to us for due diligence when they are considering a subdivision, development, or investment. We gather all available data and information to provide you with an independent assessment of the opportunity presented.

  • Feasibility study covering expectations, goals and objectives
  • Review and assess planned budgets, design criteria
  • Inspections for safety, accuracy and reliability
  • Compliance checking to local authority regulations and best practice standards

The specialist knowledge and expertise of our Directors is recognised within the industry and engineering community. Our Directors have been called upon by the Environment Court to provide expert witness testimony.



Fill in the form below to enquire about this service. Please make sure you fill in all required (*) fields.

Name *
Email Address *
For more information contact:

Geoff Webster
P 09 524 7029
M 021 756 494

Campbell Burrows
P 09 524 7029
M 021 894 190

Bronwyn Rhynd
P 09 524 7029
M 027 454 5533

Mark Gilberd
P 07 849 9921
M 027 289 1771

Bevan Houlbrooke
P 07 849 9921
M 021 232 0784 

Case Studies

Fletcher Living – Whenuapai Village

CKL is working with Fletcher Living on a long-term, large-scale residential development to create new communities in Auckland’s northwest. The development will be delivered in 8 stages across 15 years, converting farmland to liveable urban spaces. Currently the first two stages are built with landowners sharing the new urban environment in standalone and terrace housing.

A project of this size and scale has to be flexible and adaptable to accommodate changes to urban planning requirements and the needs of the community. CKL is taking this project from concept to development.

Comprehensive site assessments have been carried out and the proposed plan for the development is firmly anchored by a water sensitive urban design philosophy. As an important catchment area, we have taken a much softer, greener approach to the engineering plan for the roading system and stormwater management. Bio detention devices, stormwater ponds and filtration trenches have all been factored into the catchment management plan and will strongly influence the subdivision design.

Opaheke, Papakura

Auckland Council and the Government have identified the former Papakura Golf Course on Bellfield Road and an adjoining property on Opaheke Road as a Special Housing Area (SHA).

The Plan Variation Application, put to Council in 2016 proposed the development of 500 new homes, adjacent to a public reserve. The developer plans to integrate the reserve into the SHA, providing residents with access to proposed cycle tracks, confidence course, volleyball and fitness equipment, open grassland and an off-leash dog area.

CKL’s stormwater team (previously Stormwater Solutions) was engaged by the developers of the Bellfield Road project in 2015 to provide a comprehensive site assessment, stormwater management design and flood risk assessment. We also provided guidance for the stormwater modeling and reviewed the outcomes. The stormwater management strategy was implemented through concept and consenting phases.

Te Awa Lakes

Te Awa Lakes is a proposed 62ha development for the old Perry sand quarry at Horotiu that will transform Hamilton’s northern gateway into a vibrant community hub and tourism destination. Bordered by the Waikato Expressway and the Te Awa Cycleway, the development will include around 860 high quality medium density residential dwellings, retail shops, river links, tourism activities, and a water adventure park.

CKL has been working closely with Perry Group in support of the land use change and plan change proposals to convert the former industrial site to residential and recreational use with the design of the lakes and wetlands.

This water sensitive urban design project brought together our environmental and stormwater engineering teams to develop a stormwater design and strategy that would restore the freshwater system within the urban development and effectively manage stormwater discharge to the lakes and ultimately the Waikato River.

Our guiding principle was to design an integrated lake and outfall river system to minimise impact on the Waikato River. Stormwater run-off from the Expressway and across the development site will be directed through wetlands for bioretention and treatment before discharge. Our strategy has been used to support the land use change proposal and Bronwyn Rhynd has provided expert testimony at Council hearings.

Independent Witness

Many development projects require the engagement of an expert witness to provide an independent opinion on various aspects of the development application. The opinion sought may relate to the most appropriate supplier of products, a view on the engineering design and construction, through to providing comment on compliance issues.

Bronwyn Rhynd has served as an expert witness on many occasions. As an expert in her field, Bronwyn is well placed to review all background information and establish an independent and professional opinion of the issues relating to various wastewater and stormwater systems, and flood management plans - with respect to fit for purpose allegations, meeting code of practice, or recommending best practicable options.

Foodstuffs Pukekohe

A New World supermarket is planned for Pukekohe, and CKL has been engaged to conduct a flood risk assessment on the proposed site, drawing on our flood modeling expertise.

The site is known to receive a significant volume of water from an upstream catchment and the flood plan extends across this site. The construction of a large car park creates an impervious surface, changing the natural flow of water and necessitating a flood management plan to be set in place.

Working with the client’s design for the building and surrounding car park, our engineers were able to predict water levels and the extent of flood damage as a result of a 100-year storm event. The value of the flood modeling process enables us to validate the flood management plan in line with the Resource Management Act and the Auckland Unitary Plan.

The engineering design solution has been provided to the client and we are now working with the client on the building consent application. The flood modeling information has been presented to Council by CKL, in the capacity of flood assessment to support a resource consent and subsequent hearing of this as expert witness.