What do you need on the asset?
I need an inspection
Principal, general and special inspections to CS 450 and NR/L3/CIV/006, with BCMI or BCI scoring and a defect record you can act on.
Inspections → 02 — Find out what it can carryI need it assessed
Capacity assessment to CS 454, NR/GN/CIV/025 and NR/L3/CIV/0024 — masonry arch, metallic, concrete and prestressed structures.
Assessments → 03 — Get the works designedI need a design or temporary works
Permanent and temporary works design to the Eurocodes and BS 5975, with Forms A, B and G and independent design checks.
Temporary works →ICE award-winning designs led by our two directors
Years of combined chartered experience across rail and highway structures
In-house calculation modules in CERYN Core, issued as standards-referenced calc sheets
Accreditations current for PQQ — Constructionline Gold, SSIP, UKAS 23045, Once For All
These are the 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.
Bringing together engineering excellence and technical expertise
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
Rail
Network Rail, Transport for Wales and TfGM assets — rail structures, NR-compliant design, inspections and assessments.
Read more
Bridges
Specialist support for new and existing rail and highway bridges, footbridges and service bridge assets.
Read more
Inspections
Detailed examinations to NR/L3/CIV/006, with Inspection Reports and BCMI or BCI scoring.
Read moreA clear route from
uncertainty to action
Each engagement is structured to keep findings, assumptions and recommendations transparent — a delivery trail that clients can explain, share and action.
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.
Chartered engineering
judgement, built on evidence.
CERYN Engineering Ltd is a Civil & Structural Engineering Consultancy providing end-to-end support across the asset lifecycle — from inspection and defect identification, through load capacity assessment, to the design of permanent engineering solutions and the temporary works that enable their safe and efficient construction.
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.
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.
Six sectors, one
joined-up team.
CERYN provides inspection, assessment, design and assurance services across rail, highway and building assets. Each sector page sets out our capability, standards and example project work.
Rail
Rail infrastructure work spans Network Rail, Transport for Wales and TfGM — rail structures, NR-compliant design, inspections and assessments.
Read moreBridges
Specialist support for new and existing rail & highway bridges, footbridges and service bridge assets, with strengthening and repair design.
Read moreBuildings
Specialist structural design and assessment for new and existing buildings across commercial, residential and industrial sectors.
Read more
Temporary Works
Temporary works design across railway, highway and built-environment sectors — demolition, propping, falsework and lifting.
Read moreInspections
Detailed examinations and inspections for assessments to NR/L3/CIV/006, with Inspection Reports and BCMI or BCI scoring.
Read more
Assessments
Structural assessment (ULS, SLS and PLS) of railway and highway bridges, footbridges and building structures.
Read moreWhat we are asked to do, in detail.
{{ grp.name }}
- {{ item }}
{{ sectorHeadline }}
{{ sectorIntro }}
- {{ row.k }} — {{ row.v }}
{{ exampleTitle }}
{{ exampleCredits }}
{{ exampleBody }}
The problem. {{ exampleProblem }}
What we did. {{ exampleDid }}
The result. {{ exampleResult }}
A track record across
rail, bridges and buildings.
A selection of recent inspection, assessment, design and temporary works projects.
{{ feat.title }}
{{ feat.credits }}
{{ feat.overview }}
The problem. {{ feat.problem }}
What we did. {{ feat.scope }}
The result. {{ feat.outcome }}
{{ grp.name }}
{{ grp.countLabel }}{{ gp.title }}
{{ gp.blurb }}
Project updates and
practice news.
Announcements, completed commissions and technical notes — posted here and on our LinkedIn page.
Transparent calculations, not black boxes.
Commercial packages give a number; assessment and design work needs a defensible argument. CERYN Core was written so that every input, code clause and intermediate result is visible on the output sheet, in the same layout our clients already receive from us.
It also removes the repetitive parts of the job — section properties, load combinations, capacity checks — so engineering time goes into judgement rather than transcription. The suite is developed and maintained in-house, which means new modules follow the standards our current projects demand.
Forty-nine modules and four reference libraries.
{{ familyName }}
{{ familyBody }}
- {{ mod }}
The four modules below run the same engines we use in practice, cut down to a single load case so you can see the method working. Results are illustrative and are not a design, an assessment or engineering advice. Nothing here is checked, signed or fit to build from — ask us for a calculation package if you need one.
CERYN Arch Analysis
Heyman plastic / mechanism methodThrust-line stability of a masonry arch or viaduct by Heyman's plastic / mechanism method — drag the load along the deck and watch the factor of utilisation respond.
Try it in your browser
CERYN Frame Analysis
Direct stiffness method (2D)Any 2D frame solved by the direct stiffness method, for reactions, axial, shear and moment diagrams and the deflected shape.
Try it in your browser
CERYN Axis
Section properties & geometric analysisGeometric properties of any cross-section, from a boundary you draw or type — built for the non-standard member with no catalogue properties.
Try it in your browser
Steel Beam Design Check
EN 1993-1-1 capacity checkA full EN 1993-1-1 capacity check for a single-span beam, against the 560-section UK catalogue.
Try it in your browserWhat this means for your project
Every assessment and design we issue is produced through these modules, so the calculations arrive referenced to their clause, with the assumptions written down and the working visible to your checker. You do not need to use the software — the tools below are here if you want to see the method for yourself.
Drag a load across a masonry arch. Watch it pass or fail.
CERYN Core's own thrust-line solver, running in your browser. Set the arch geometry, fill and loading, then drag the yellow marker along the deck — the thrust line, the hinge positions and the Factor of Utilisation re-solve on every move. FOU ≤ 1 means a thrust line still fits inside the ring: the arch stands.
{{ grp.desc }}
The title block the desktop module puts on the issued sheet. This browser tool issues nothing, so it is read-only here.
{{ err }}
{{ ck.reference }} {{ ck.demand }} {{ ck.capacity }} {{ ck.util }} {{ ck.status }}
{{ archHingeNote }}
{{ w }}
Scope, assumptions and limits
A single-span circular segmental masonry arch by Heyman's plastic / mechanism method: the solver searches for a thrust line that stays inside the ring under the full factored dead, fill, surfacing and live loading, then bisects on the load factor to find where a collapse mechanism forms. Fill and surfacing self-weight are generated from the geometry, and the live load is dispersed through the fill at the stated angle before being lumped onto the ring.
This is a geometric stability check, not a finite-element or crushing-strength analysis — masonry strength fk, the material factor γm and the fill friction angle φ are reported for record but not used numerically. Live-load dispersal uses a user-defined dispersal angle assumption. The default value is 30°, but this can be modified by the user. The module applies the selected angle directly and can be modified according to ground properties for each particular project. No passive arching or backfill restraint is modelled: fill is dead weight only, which is generally the conservative side.
One span, one load case, results only — no title block, no assumptions and limitations statement, no step-by-step working and no sign-off. Multi-span viaducts with pier stability, the automatic worst-case position sweep, the outrigger / patch load shape and Word or PDF export are in CERYN Core, not here. Genuinely asymmetric, skewed or distorted arches need engineering judgement beyond any of this.
Solve a portal frame by the stiffness method.
CERYN Core's own 2D plane-frame solver, running in your browser. Set the geometry, the section and three load cases, combine them however you like, and the bending, shear, axial and deflected-shape diagrams re-solve as you type. The desktop module draws any frame you can imagine; this page drives one guided shape through exactly the same solver.
{{ grp.desc }}
Factors on each load case. ULS rows drive the capacity checks, SLS rows the deflection checks.
Add combination{{ err }}
{{ ck.reference }} {{ ck.demand }} {{ ck.unit }} {{ ck.capacity }} {{ ck.unit }} {{ ck.util }} {{ ck.status }}
{{ ck.note }}
{{ mr.detail }} {{ mr.M }} {{ mr.V }} {{ mr.N }} {{ mr.d }} {{ mr.combo }}
Scope, assumptions and limits
A genuine linear-elastic direct-stiffness solve of the frame as drawn: five nodes, four prismatic members, your support condition, and three load cases combined by the factors you set. Member end actions, the full bending, shear and axial distributions and the deflected shape all come straight out of CERYN Core's own solver — the same code the desktop editor calls for an arbitrary frame.
The capacity checks here are cross-section checks to EN 1993-1-1 §6.2 only. Member buckling — flexural, lateral-torsional and in-plane frame stability — is not checked, and nor are connections, base details, second-order (P-δ) effects or plastic hinge formation. A real portal frame is usually governed by one of those, so treat a PASS here as "the sections are big enough in principle", not as a design.
One guided shape, one section for the whole frame, results only — no title block, no assumptions and limitations statement, no working and no sign-off. Arbitrary geometry, one section per member, tension-only members, DXF import and export and the issued calculation sheet are in CERYN Core, not here.
Build a cross-section. Get its properties.
The same calculation engine that ships inside CERYN Core, running in your browser. Draw the boundary on the canvas or type coordinates directly, add a void loop to cut a hole, and the headline properties update on every edit.
Section geometry
One or more solid loops define the material. A void loop cuts a hole from the solid it sits within.
DXF import is part of the CERYN Axis module inside our CERYN Core desktop software, not this browser tool. Build the section here by drawing it or typing coordinates, or talk to us about CERYN Core if you need to bring geometry in from CAD.
Dismiss{{ err }}
{{ r.note }}
{{ axisTorsionNote }}
Scope, assumptions and limits
Area, centroid, second moments of area, principal axes and radii of gyration come from closed-polygon line-integral formulas — exact for the polygon as drawn, with no meshing or discretisation error. Plastic moduli use an exact equal-area-axis search, valid for any simple polygon rather than only orthogonal shapes.
The St Venant torsion constant J is an approximation — a thin-walled sum for open sections, Bredt-Batho for a single-cell closed section. It degrades for chunky or solid regions, and multi-cell closed sections are not supported. No warping constant is computed at all. The polar second moment Ip is given as an upper-bound sanity reference only.
A geometry calculator, not a design check. It verifies nothing against Eurocode, BS 5400 or CS 454, and performs no capacity, classification or buckling assessment. A void loop is assumed to lie fully within the solid material. For an issued calculation sheet with a title block, stated assumptions and a signature, use CERYN Core itself.
Check a steel beam to Eurocode 3.
CERYN Core's own EN 1993-1-1 engine, running in your browser against the full 560-section UK catalogue. Set the section, span, restraint and loading; the beam diagram updates as you type, and Calculate returns every relevant capacity check with a governing utilisation and a verdict.
{{ sbLockedTitle }}
{{ sbLockedBody }}
The browser check below stays limited to a single span on a catalogue section. Talk to us if you need this mode on a live job.
{{ sbPreviewNote }}
{{ grp.desc }}
- Analysis-only mode, for design actions before the member has been sized.
- The issued calculation sheet — title block, assumptions and limitations, sign-off, and Word or PDF export.
- Section classification and every step of the working, with substituted values and clause references.
{{ err }}
{{ ck.reference }} {{ ck.demand }} {{ ck.unit }} {{ ck.capacity }} {{ ck.unit }} {{ ck.util }} {{ ck.status }}
{{ w }}
Scope, assumptions and limits
A simply supported or propped single-span beam to BS EN 1993-1-1 with the UK National Annex: cross-section classification, bending, shear, combined bending and shear, lateral-torsional buckling, axial resistance, flexural buckling, biaxial bending, torsion, combined bending and axial force, and deflection. Checks appear only when the loading or restraint condition makes them relevant.
Standard EC3 provisions only. Non-standard support conditions, dynamic or fatigue loading, fire, seismic and second-order effects are outside its scope, as is the torsion check's warping component for open sections — the engine flags that case as unconservative. It does not choose a section for you or judge whether the loading is right.
This is a public-facing capability check: results only, no title block, no assumptions and limitations statement, no step-by-step working and no sign-off. Bespoke sections, continuous multi-span beams, analysis-only mode and Word or PDF export are in CERYN Core, not here. For anything suitable for issue, use CERYN Core or talk to us.
All four are modules inside CERYN Core, our in-house calculation software. The desktop version adds the full input range, every step of the working with its clause references, and a formatted, checked and signed calculation sheet with Word or PDF export.
Talk to us about CorePick a module, open its workspace.
Steel section design — as the calc sheet is issued.
| Check | Clause | Action | Resistance | Utilisation |
|---|---|---|---|---|
| Bending, major axis | EN 1993-1-1 §6.2.5 | 412 kNm | 650 kNm | 0.63 |
| Lateral torsional buckling | EN 1993-1-1 §6.3.2.3 | 412 kNm | 521 kNm | 0.79 |
| Shear, vertical | EN 1993-1-1 §6.2.6 | 196 kN | 1,004 kN | 0.20 |
| Deflection, characteristic | UK NA · span/360 | 18.1 mm | 23.3 mm | 0.78 |
Illustrative extract from a CERYN Core steel design sheet — values shown are from a worked example, not a live project.
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
Autodesk Robot, Tekla Tedds, LimitState Ring, Archie-M and SuperStress, 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.
Open roles in Newport
{{ job.title }}
{{ job.summary }}
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.
Let's discuss the project
context and decision points.
A typical engagement starts with a scope call, a review of what you already have, and a clear proposal setting out outputs, programme and support.
- 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.
{{ ctaHeadline }}
Tell us about the asset and the decision you're facing — we'll set out the right level of inspection, assessment or design input.
We use cookies to help this site work and to understand how it is used. You can accept all cookies, reject non-essential ones, or set your own preferences.
Customise consent preferences
×Cookies categorised as necessary are stored on your browser because they are essential for the basic functionality of the site. All other categories are optional and set only with your consent.