What do you need on the asset?
I need an inspection
Principal, General and Special Inspections to CS 450 and NR/L3/CIV/006, including condition assessment, BCI/BCMI scoring where applicable, defect recording and repair recommendations.
Inspections → Find out what it can carryI need it assessed
Capacity assessments to CS 454, NR/L3/CIV/035 and related Network Rail assessment standards for masonry, metallic, concrete and composite structures.
Assessments → Get the works designedI need a design or temporary works
Permanent and Temporary Works design to the Eurocodes and BS 5975, including Category 0-3 checks, Forms A, B & G, and independent design verification.
Temporary works →ICE award-winning designs led by our two directors
Years of combined chartered experience across rail and highway structures
Calculation modules in CERYN Core, each issued as a full sheet with the clause of every check
Clients we currently work with
Client logos are shown for reference only and remain the property of their respective owners. Their inclusion does not imply endorsement of CERYN Engineering Ltd.
Chartered engineers for rail and highway structures
CERYN Engineering Ltd brings together chartered civil and structural engineering expertise, diverse project experience and practical, buildable solutions across rail, highway and building assets. We provide clients with a single, accountable point of contact for inspection, assessment and design, from early investigation through to delivery documentation.
Sectors we work in
Inspection, assessment
and design
One team across the asset lifecycle. Select a stage to see what you receive, the standards we work to and a recent project.
A track record across
rail, bridges and buildings
River Ebbw Formation Underbridge infill and handrail design
GRP infill plates and handrail renewal to a disused truss underbridge, closing fall risks through the bottom chord.
Avonmouth Viaduct runway gantry beams
Close-up Principal Inspection of the cantilever runway beam system, carried out to CS 450 from the existing underdeck gantry.
Chippenham Station canopy bracing and propping
Canopy assessment and truss bracing in the temporary condition, allowing steelwork repairs with the station open to the public.
To be the consultancy asset owners call when the answer has to hold up.
CERYN exists to keep ageing highway and rail structures in safe, economic service. Our vision is a practice where every recommendation is traceable to evidence and to a clause — where an asset owner, a checker or the next engineer can follow the reasoning without having to repeat the work.
We intend to grow deliberately rather than quickly: chartered directors remaining on the job, in-house calculation tools developed to match the standards our projects demand, and a team given real responsibility early under chartered supervision. Reputation is built one defensible deliverable at a time.
Keep infrastructure in service
Assessment and targeted intervention ahead of replacement, so budgets extend asset life rather than shorten it.
Make the reasoning visible
Calculations issued in a checkable format, referenced to CS 454, the Eurocodes and Network Rail standards — never a black box.
Build the next generation
Structured chartership routes and breadth across inspection, assessment and design rather than a narrow specialism.
Efficiency
Scope set at the right level for the decision in hand — no assessment work that the question does not need.
Precision
Every check referenced to its clause, every assumption written down and testable by the next engineer.
Safety
Work planned for live rail, highway and buildings environments, with temporary works considered from the outset.
Collaboration
Directors on the job, working alongside contractors, checkers and asset owners rather than reporting from a distance.
Specialising in Highway, Rail and building structures, CERYN provides a complete suite of inspection, assessment, design and assurance services, covering bridges, structural refurbishments, retaining walls, culverts and other critical infrastructure assets. The consultancy also delivers Network Rail–compliant engineering services, including design certification, structural assurance and documentation aligned with industry standards.
Decisions made with confidence, risk understood early, and delivery information ready for action.
Two chartered engineers,
one joined-up practice
Chartered Civil Engineer with over 15 years' experience delivering and assuring inspections, assessments and design of railway and highway structures in safety-critical environments. A proven CRE (Design & Assessment) and Technical Engineer, with extensive experience working within Network Rail governance, leading multidisciplinary teams through complex investigations, design development and delivery. Recognised for technical excellence and collaborative delivery, having acted as Lead Design Engineer on ICE award-winning projects, including the refurbishment of the cable-stayed Ynysangharad Footbridge in Pontypridd and the iconic Menai Suspension Bridge footway replacement.
Core expertise
- Structural inspections and assessments of bridges, tunnels, station buildings and civil assets
- Load capacity assessment of masonry, metallic, reinforced concrete and prestressed bridges
- Permanent and temporary works design in constrained, live environments
- CRE (Design / Assessment) and Project Engineer (PE)
- Engineering assurance, technical approval and risk-based decision making
Sector experience
- Rail infrastructure — Network Rail, Transport for Wales and TfGM
- Historic and listed structures
- Highways and local authority assets across South Wales
- Station buildings and operational property structures
Chartered Civil & Structural Engineer with 18+ years' experience in consultancy environments across the UK and Spain, with proven ability to scale teams and companies with sustainable growth, manage senior stakeholder relationships and align technical delivery with business strategy. Experienced in inspections, assessments, repairs and new designs across Rail, Bridges, Buildings & Temporary Works. A proven CRE (Design & Assessment) and Project Engineer (PE), with extensive experience working within Network Rail governance. Recognised for technical excellence and collaborative delivery, having acted as Lead Design Engineer on ICE award-winning projects, including Principality Stadium Roof Walk (ICE Chair's Special Award 2024) and Truro Tidal Gate (ICE Judge's Special Award 2025).
Core expertise
- Specialist structural engineering across the railway and highway sectors (bridges, tunnels, station buildings and civil assets)
- Delivers inspections, assessments and design for both temporary and permanent works
- Design management of larger, complex or high-risk projects and oversight of the team's projects
- CRE (Design / Assessment) and Project Engineer (PE)
- Engineering assurance, technical approval and risk-based decision making
Sector experience
- Highways and local authority assets across South Wales and South West England
- Rail infrastructure — Network Rail, Transport for Wales and TfGM
- Historic and listed structures
- Station buildings and operational property structures
Independently verified,
so procurement is straightforward.
Our accreditations are kept current so that framework and PQQ requirements are already satisfied before a scope is agreed. Certificates and insurance details are available on request.
Request certificates
Constructionline Gold
Health and safety, quality, environmental, equality and financial standing assessed and verified annually.
SSIP Registered Member
Safety Schemes in Procurement recognition, accepted across principal contractor supply chains.
UKAS Inspection 23045
Inspection activity carried out within a UKAS-accredited framework, giving traceable examination records.
Once For All
Compliance documentation held centrally and kept up to date for client onboarding.
Evidence-led advice,
documented for action
Evidence captured before recommendations are made
Assumptions documented and tested against project context
Calculations, sketches and drawings reviewed for practicality
Risks translated into clear actions and next decisions
This creates a transparent technical record that supports accountability without slowing the project unnecessarily.
Rail
Rail infrastructure work spans Network Rail, Transport for Wales and TfGM — rail structures, NR-compliant design, inspections and assessments.
Rail workBridges
Specialist support for new and existing rail & highway bridges, footbridges and service bridge assets, with strengthening and repair design.
Bridge work
Buildings
Specialist structural design and assessment for new and existing buildings across commercial, residential and industrial sectors.
Building work
Temporary Works
Temporary works design across railway, highway and built-environment sectors — demolition, propping, falsework and lifting.
Temporary worksInspections
Detailed examinations and inspections for assessments to NR/L3/CIV/006, with Inspection Reports and BCMI or BCI scoring.
Inspection work
Assessments
Structural assessment (ULS, SLS and PLS) of railway and highway bridges, footbridges and building structures.
Assessment workWhat we are asked to do, in detail.
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Masonry arch assessment in your browser
Drag an axle across a masonry arch and watch the line of thrust, the hinges and the factor of utilisation. A demonstration, not for assessment.
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Structural calculations, from the first sketch to the issued sheet.
CERYN Core is the calculation software we built for our own work in inspection, assessment and design. It brings together more than 100 calculation modules to the Eurocodes, British Standards and Network Rail standards, with analysis tools for frames, sections, connections and masonry arches. Every calculation produces a full sheet with the clause of each check, the symbols as the codes write them, drawings to scale and the bending moment, shear force, axial force and deflection diagrams of every member.
CERYN Core in 30 seconds.
A short overview of what CERYN Core covers and how it is used.
0:30 · Plays muted, sound optional Try it yourselfThe calculation modules, and the analysis tools behind them.
100+ calculation modules in eleven disciplines.
New in October 2026
CERYN Core 0.5.133, released on 16 October 2026.
8 changes in this releaseTry it.
Five small demonstrations of CERYN at work. Each one runs the same method as the software for a simple case, in your browser. They are for illustration only and not for design.
Sheets ready to issue, and the tools around them.
Contact us about CERYN Core
Write to either director about the software, a calculation or a demonstration on one of your own structures.
Real structures, early responsibility, chartered supervision.
We are a small consultancy led by two chartered directors, working directly on highway and rail structures for Network Rail, Transport for Wales and tier-one contractors. That means no layers between you and the asset: you inspect it, assess it, and design the intervention.
Engineers here are trusted with their own scopes early, supported by director-level review on every deliverable. If you want breadth across inspection, assessment and design rather than a narrow specialism, this is the right size of practice.
Chartership support
Structured ICE and IStructE routes with a chartered supervising civil engineer, mentor time and paid professional fees.
Site and desk balance
Time on structures as well as in the analysis — examinations, night possessions and the assessment work that follows.
Flexible working
Hybrid arrangements around inspection programmes, with time-off-in-lieu for possession and weekend work.
Software and training
CERYN Core, our own calculation software, with its analysis tools for frames, sections, connections and masonry arches, plus PTS, confined space and rope access training as required.
Breadth of work
Bridges, retaining walls, culverts, buildings and temporary works — across inspection, assessment and design in the same year.
Direct client contact
You present your own findings to asset owners and contractors, with a director alongside you.
Salary and holidays
A competitive salary, reviewed every year, and a generous holiday package on top of bank holidays.
Open roles in Newport
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Applications are reviewed by the directors. Send a CV and a short note on the structures you have worked on to info@cerynengineering.co.uk.
No suitable role listed?
We keep talking to engineers whose experience fits the direction of the practice, particularly in rail structures examination and assessment. Tell us what you want to work on and we will be straight with you about whether and when we can offer it.
- Company
- CERYN Engineering Ltd
- Address
- 3.6 Riverside Offices, High Street,
Newport Market, Newport, NP20 1FX - Telephone
- 07903 545503 / 07530 065952
- General enquiries
- info@cerynengineering.co.uk
- Directors
-
Owain E. Gronow — owaingronow@cerynengineering.co.uk
Sergio Alarcon Gener — sergioalarcon@cerynengineering.co.uk
Enquiries go straight to a chartered director — Owain or Sergio — who will reply within one working day. Urgent site issues are better by phone.
That page is not on the drawing
The address you followed does not match anything on this site — it may have been mistyped, or the page may have moved. The links below cover everything we publish.
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Tell us about the asset and the decision you are facing, and we will set out the right level of inspection, assessment or design input.
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