Specialist Structural Engineering & Asset Management Consultancy
Contact Us >Contact: [email protected]
Mobile: +64 (0)27 381 2041
At Tethera, our mission is to provide independent structural engineering and asset management advice that enables confident, informed decisions.
We combine technical expertise with strategic insight to support everything from building design to long-term infrastructure stewardship.
Our focus is on clear solutions, effective use of data, and practical compliance strategies—ensuring outcomes that are resilient, efficient, and built to last.
And yes, we really do build bridges—both the literal kind and the figurative ones that connect people, ideas, and outcomes
What services do we offer?
Tethera provides independent structural engineering and asset management services across residential, commercial, and infrastructure assets.
Asset Management Engineering
We can work with you to identify what assets you have, what condition they are in and what your risks and opportunities are
- • Inspections of all types of structures (road bridges, farm bridges, rail bridges, lighting towers, buildings, warehouses, depots, gantries)
- • Review of inspection reports for all types of structures
- • Asset data development and analysis
- • Inspection compliance regime development, implementation and review
- • Maintenance and renewal planning within constrained budgets
- • Risk assessment and prioritisation
- • Standards and processes, development and review
Independent Engineering Advice
Tethera is intentionally independent so we can deliver truly impartial and objective advice. Once we know what the risks and opportunities of your assets are, we help you decide what the next steps are
- • Independent client-side technical advice
- • Review, interpretation and comparison of multi-disciplinary reports
- • Requirements assessment – navigating needs vs wants
- • Project scoping
- • Design management
- • Specialist expertise in Public Works Act impact assessment
Structural Engineering Design
Our advice is underpinned by technical expertise. We can supply design services for projects as an add-on or an independent service.
- • Low rise residential and commercial building design
- • Small road, farm and pedestrian bridge design
- • Repair and maintenance design and specification for all structures
- • Structural condition assessment and structural capacity assessment for buildings and bridges
- • Specialist design services for alterations or assessment of historic structures and non-standard materials
A bit about Tethera
JENNIFER CRITCHLEY
Chartered Professional Engineer:
CMEngNZ, CPEng, IntPE(NZ) / APEC Engineer
Dual Practice Areas:
Structural Engineering and Asset Management Engineering
Jennifer Critchley is a highly experienced Chartered Professional Structural Engineer with specialist expertise in asset management and condition assessment of all types of structures.
She brings over 20 years of experience, spanning buildings, rail infrastructure and government sectors. Jennifer is passionate about finding pragmatic, simple solutions to complex problems—whether in the design of new residential and commercial buildings or the management of existing infrastructure. Her career spans hands-on technical practice and senior leadership roles, consistently delivering value through systems thinking and strategic insight.
Jennifer’s structural engineering capabilities include design of all types of structures, condition and risk assessment, maintenance and upgrade design, renewals prioritisation, and the development of standards and compliance regimes. Jennifer’s deep technical understanding is complemented by niche expertise in regulatory processes, litigation and liability, and Public Works Act impact assessment and recovery.
Jennifer has specialist experience in the emergency recovery of damaged structural assets (including both bridges and buildings), providing rapid condition assessments, risk evaluations, and stabilisation strategies under urgent or evolving conditions. Jennifer is also an MBIE Level II Rapid Building Assessor.
She also brings strong expertise in asset data—supporting clients to collect, structure, interpret, and apply data effectively to inform decision-making, prioritisation, and long-term planning.
Known for her clear communication style, Jennifer engages seamlessly with both technical and non-technical audiences. Her calm, collaborative approach helps navigate challenges that require careful balancing of technical, risk, and commercial considerations.