Infrastructure Companies in Cardiff: 303 Active Firms (2026)
Infrastructure companies in Cardiff build, maintain and operate essential transport, utilities and built-environment assets across the city region.
Buying centres tend to sit with local authorities, infrastructure owners, main contractors, facilities teams and commercial landlords rather than with a single operational buyer. Sales cycles are usually tender-led, with qualification around technical capacity, field delivery, asset knowledge and the ability to manage subcontractors. The Cardiff cohort spans civil engineering, utilities support, transport works, energy projects, telecoms deployment and built-environment services, so engagements are often project-based rather than subscription-like. Typical customers appear to be public-sector bodies and commercial asset holders seeking delivery partners that can handle compliance-led procurement, site work and ongoing maintenance.
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Cardiff has 303 actively trading infrastructure companies, making it a compact local supplier base rather than a broad national industry sample. Reported employment across the cohort is 1,989 people. The size profile is uneven: 32 firms report turnover above £5M, while 54 were incorporated since 2022. That mix points to an established contractor and asset-services layer, with a newer fringe of entrants likely competing for subcontracting, maintenance and specialist works rather than full programme ownership.
Compliance burden sits inside the commercial model rather than as a separate licensing story. Public-sector and commercial customers usually buy through tendered packages, with qualification around technical specialists, field teams, asset-management capability and evidence that the contractor can manage compliance-led procurement. Civil engineering, utilities, transport, energy, telecoms and built-environment work each carries its own client-side standards, so firms selling across several workstreams need repeatable bid processes and clear responsibility for subcontractors. Cardiff operators therefore compete on delivery assurance as much as headline project scope.
Cardiff’s infrastructure cohort appears likely to remain procurement-led, with growth depending on access to framework work, subcontractor networks and the ability to retain field capacity. Newer entrants may find space in specialist maintenance, telecoms deployment and energy-related packages, while more mature operators tend to have the bid resources needed for multi-party projects. Consolidation would not be surprising where compliance, insurance and supervisory costs weigh on smaller firms. The market does not look like a venture-style software category; it is slower, asset-adjacent and tied closely to public and commercial capital spending.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
303
Active firms
2026
32
Over £5M
Companies above £5M turnover
54
Since 2022
New incorporations
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Key facts
About 10% of the trading cohort reports turnover above £5M (32 of 303 firms) — the rest sits below that revenue band.
17% of the cohort was incorporated since 2022 (54 firms), so a sizeable share is in its first few filing cycles.
Cardiff infrastructure suppliers tend to sit close to public procurement, capital budgets and private development pipelines.
Housing delivery, transport maintenance and utilities work link the sector to local planning and public-spending cycles.
Buyer conversations often split between contractors, operators and asset-specific vehicles rather than a single infrastructure category.
Project vehicles and group entities appear in the market, so assets and operating teams may sit in different legal companies.
Top Cardiff Infrastructure companies
Financial sub-scores
Computed from 3 filingsProvides civil engineering and road surfacing services, including construction of roads, car parks, retaining walls, bridges, marine works and drainage systems. Undertakes infrastructure projects for…
Serves local authorities, public bodies, property developers and blue-chip companies needing civil engineering and surfacing contractors, mainly across South East Wales and the Cardiff area.
Financial Health
StableStable · 0% CAGR over 2y
Location
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Computed from 5 filingsDesigns and manufactures flat‑packed concrete infrastructure products, including deployable water storage tanks and prefabricated concrete slabs. Uses concrete‑impregnated fabric structures that are…
Serves a mix of B2B and public-sector buyers needing portable water infrastructure, including military, disaster relief, agriculture, rural development, industrial water management, contractors, and…
Financial Health
DistressedDistressed
Location
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Computed from 4 filingsProvides engineering consultancy services including highway infrastructure design, NEC ECC project management, and quantity surveying. Supports transport and civil infrastructure projects from…
Serves public sector and local authority clients, including councils and transport bodies, commissioning highway infrastructure, public transport and civil engineering projects.
Financial Health
StrongStrong · Growing, Hiring · 36% CAGR over 3y
Location
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Computed from 2 filingsProvides engineering, project management, and installation services for maintenance, upgrade, and life‑extension of industrial and marine assets. Activities include design, prefabrication, mechanical…
Serves B2B asset owners and operators in marine transportation, offshore oil and gas, power generation, renewables, industrial and utilities sectors with critical infrastructure and asset…
Financial Health
StableStable · Hiring · 21% CAGR over 1y
Location
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Computed from 3 filingsProvides consulting civil and structural engineering services for construction projects, including design, analysis and engineering advice for residential, commercial, education, healthcare,…
Serves public and private sector clients in Wales and across the UK, including housing developers, commercial property owners, schools, universities, healthcare providers, highways bodies,…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
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Provides demolition, land remediation, construction, recycling and resource management services through a group of subsidiaries. Activities include waste recycling, soil supply, site clearance and…
Serves B2B and public-sector customers in the Welsh construction, land development and environmental sectors, including organisations managing sites, materials and regeneration projects.
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Computed from 3 filingsProvides electrical installation services for mechanical and engineering contractors, supporting projects in sectors such as rail infrastructure, commercial buildings, stadiums, utilities and…
Sells to businesses, particularly mechanical and engineering contractors, serving projects in the rail, commercial, stadium, utilities and custodial sectors across the UK.
Financial Health
DistressedDistressed · -18% CAGR over 2y
Location
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Computed from 4 filingsProvides structural repair and strengthening services for concrete and other structures, including composite reinforcement systems, structural surveys, testing, and investigations. Works on…
Serves main contractors, local authorities, engineering organisations and asset owners/operators across the UK and Europe in highways, bridges, commercial and industrial buildings, residential…
Financial Health
StableStable
Location
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Computed from 4 filingsProvides civil and structural engineering consultancy services including design, BIM modelling, and engineering of infrastructure and buildings. Also delivers project and cost management and…
Serves business and public sector clients delivering built environment and infrastructure projects, including buyers in highways and active travel, urban design, energy and utilities, water,…
Financial Health
HealthyHealthy · -75% CAGR over 3y
Location
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Computed from 5 filingsProvides construction and civil engineering services for projects including residential housing, education facilities, care homes, retail developments, infrastructure works, and waste and…
Serves public and private sector clients across education, residential housing, care homes, commercial, retail, industrial, infrastructure, community, and waste and environmental projects.
Financial Health
HealthyHealthy · 2% CAGR over 3y
Location
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Computed from 4 filingsProvides surface preparation and protective coating services including shot and grit blasting, thermal metal spraying, and application of industrial, fire‑resistant and non‑slip coatings to steel…
Serves infrastructure owners, principal contractors and industrial operators in nuclear, petrochemical, marine, rail, highways, commercial building and water-control sectors, including bridge and…
Financial Health
StableStable · -9% CAGR over 3y
Location
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Computed from 5 filingsProvides road sweeping and gully cleaning, asphalt planing and surfacing for roads, driveways, pathways and car parks. Also hires paving machines with or without operators and supplies site…
Serves local authorities, civil engineering and surfacing contractors, developers, commercial property owners, farmers and domestic customers needing roadway, driveway, pathway, car park or estate…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
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Computed from 5 filingsProvides civil engineering and groundworks services for construction and infrastructure projects, including roads, sewers, highways and foundations. Works with local authorities, utilities,…
Serves local authorities, private construction companies, utility companies, commercial clients and private customers needing civil engineering and groundwork support for construction and…
Financial Health
HealthyHealthy · Hiring · 37% CAGR over 4y
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Computed from 5 filingsProvides drilling, cutting and geotechnical services for construction projects, including diamond drilling and sawing, borehole and rotary core drilling, site investigation, grouting, ground…
Serves B2B clients in the UK construction industry, including main contractors, civil engineering firms and site/project managers on building, demolition and groundworks projects.
Financial Health
HealthyHealthy · -8% CAGR over 4y
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Computed from 5 filingsProvides scaffolding and temporary access solutions for industrial facilities and major construction projects. Designs and installs tube-and-fitting and modular scaffold systems to support…
Serves UK and Republic of Ireland construction contractors, industrial operators, demolition firms and public-sector project teams needing temporary access support for major construction, shutdown,…
Financial Health
StrongStrong · 24% CAGR over 2y
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Computed from 3 filingsProvides specialist foundation engineering and groundworks including piling systems, reinforced concrete beams and rafts, basement construction, underpinning, pressure grouting, ground anchors, and…
Serves construction businesses and project clients, including developers, contractors and organisations managing builds affected by ground conditions, subsidence, restricted access or stabilisation…
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WeakWeak · 0% CAGR over 2y
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Computed from 5 filingsProvides civil and structural engineering consultancy services, delivering design and technical solutions for construction and infrastructure projects. Works with clients to develop structural…
Serves B2B and public-sector clients commissioning civil and structural engineering design for construction projects across the UK, including project owners and construction teams.
Financial Health
WeakWeak · -69% CAGR over 4y
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Computed from 5 filingsProvides civil and structural engineering consultancy services for construction projects. Offers concept design, feasibility studies, SuDS advisory applications, building information modelling (BIM),…
Serves public and private sector clients in the built environment, including developers, contractors and project owners across commercial, education, leisure, health and social care, industrial,…
Financial Health
WeakWeak · -59% CAGR over 5y
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Computed from 3 filingsProvides consulting civil, structural and environmental engineering design services, including planning and design support for construction and infrastructure projects such as buildings, drainage and…
Serves UK organisations commissioning civil, structural or environmental engineering projects, including developers, construction-sector clients and public-sector project owners.
Financial Health
StableStable · -6% CAGR over 2y
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Computed from 5 filingsProvides electrical engineering and contracting services for rail and construction projects, including electrical design, installation, testing and commissioning, LV power and lighting systems,…
Serves B2B clients in the rail infrastructure and construction sectors across the UK, including commercial and industrial sites, depots and compounds, plus domestic customers for EV charger…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
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Computed from 3 filingsProvides transport planning and highways consultancy for development projects, including transport assessments, traffic modelling, travel plans, access and site feasibility studies, road safety…
Serves public and private sector clients involved in property development and planning projects across the UK, including developers needing transport, highways, access and sustainable travel input…
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
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Computed from 3 filingsDesigns and builds off-road cycling facilities including mountain bike trails, BMX tracks and skills areas. Provides consultation, feasibility studies, planning, and construction services for public…
Serves public sector bodies, local authorities, Forestry Commission teams and private clients seeking mountain bike trails, BMX tracks and off-road cycling skills areas.
Financial Health
StableStable · -4% CAGR over 2y
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Computed from 5 filingsProvides construction waterproofing services including podium deck and tanking systems, polyurea coatings, movement joint sealing, and waterproof mortar. Also installs pourable insulation and thermal…
Serves B2B construction clients, including main contractors, developers and civil engineering teams working on podium decks, bridges, tanking, concrete repair and protective coating requirements.
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StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 5 filingsProvides groundworks and civil engineering contracting services for construction projects, including site preparation, drainage, foundations, and infrastructure works. Undertakes projects across…
Serves B2B clients across construction sectors, including contractors and developers requiring groundworks and civil engineering subcontractors for projects of varying scale.
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HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 3 filingsProvides civil engineering contracting services for public and commercial sector projects, including footway and carriageway construction, drainage and ducting works, bridge construction and…
Serves public sector bodies and commercial organisations needing civil engineering principal contractor support, particularly through frameworks and DPS arrangements in South and Mid Wales.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
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Computed from 3 filingsProvides civil engineering and infrastructure services including construction works, groundworks and trenchless technology projects. Offers plant and machinery hire and carries out multi‑utility…
Serves construction firms, utilities providers, infrastructure developers and contractors needing civil engineering, groundworks, network works or plant hire across Wales and the South West.
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DistressedDistressed
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Computed from 3 filingsProvides high- and low-voltage cable jointing and electrical utility contracting services. Carries out cable installation, jointing, pulling and repairs, substation installations, private network…
Serves B2B clients in electrical utilities, energy infrastructure and construction, including ICPs, residential site developers, EV charging projects and private network operators in Wales and South…
Financial Health
StableStable · Hiring · 61% CAGR over 2y
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Computed from 3 filingsProvides high‑voltage engineering services including the design, manufacture and installation of electrical substations. Operates as an Independent Connection Provider delivering grid connection…
Serves B2B electricity infrastructure clients, including DNOs, IDNOs, renewable energy developers and organisations needing customer substations or grid connections for high-voltage projects.
Financial Health
StableStable · Profitable · -7% CAGR over 2y
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Computed from 3 filingsProvides construction and environmental contracting services including remediation, civil engineering, rail works, demolition, quarrying, recycling, skip hire, transport, and plant and equipment hire…
Serves public and private sector organisations needing construction, infrastructure, rail, demolition, remediation and recycling support across Wales, the Midlands, the South West and London boroughs.
Financial Health
StrongStrong · Profitable, Growing, Hiring · 14% CAGR over 2y
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Computed from 5 filingsProvides civil engineering contracting services including road construction and refurbishment, kerbing, drainage, bridge replacement and repair, retaining walls, traffic signal installation, cycle…
Serves public authorities and infrastructure clients in South, West, Mid and North Wales and South West England, typically procuring civil engineering contracts up to £2m.
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HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 5 filingsProvides civil engineering and utility infrastructure works as a principal contractor, including road surfacing, tarmac, block paving, drainage installation, duct and cable laying, kerbing,…
Serves major utilities, social housing providers, local authorities and first-tier civil engineering contractors in Wales, with some private customers for private works.
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StrongStrong · Growing, Hiring · 13% CAGR over 4y
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Computed from 5 filingsProvides civil engineering and construction services including groundworks, formwork, road surfacing, highway works, drainage, demolition, and site preparation. Undertakes infrastructure and building…
Serves property developers, local authorities, education and industrial clients across South Wales, from small-scale developments to larger civil engineering contracts.
Financial Health
StableStable · -1% CAGR over 4y
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Computed from 5 filingsProvides civil engineering and infrastructure works for utilities and public sector projects, including highway and footway construction, drainage works, traffic management, telecommunications…
Serves public-sector bodies, utilities and private-sector contractors on highways, drainage, water mains and telecommunications infrastructure projects, as a main contractor or subcontractor.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
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Computed from 5 filingsProvides engineering and contracting services for electricity networks, including overhead line installation and maintenance, wood pole installation and inspection, 11kV and low‑voltage cable laying,…
Serves electricity utilities, DNOs, commercial and industrial organisations, local authorities, construction firms and housing providers across Wales, the South West and Midlands.
Financial Health
WeakWeak · -4% CAGR over 4y
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Computed from 2 filingsProvides traffic management services for roadworks and construction projects, including traffic control planning, bespoke CAD traffic management designs, and 24‑hour maintenance of traffic management…
Serves businesses and contractors in South Wales, particularly construction and surfacing firms, that need traffic management support for sites, roadworks and public-facing works.
Financial Health
HealthyHealthy
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Computed from 3 filingsProvides road marking and surfacing services including car park and highway line marking, high‑friction anti‑skid surfacing, installation of road studs, decorative and playground markings, sports…
Serves public-sector highways teams, civil engineering contractors, commercial car park operators, schools and sports facilities across Wales, the West of England and UK-wide for selected services.
Financial Health
StableStable · 2% CAGR over 2y
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Computed from 5 filingsProvides tarmacadam and surfacing services including highway, footway and driveway resurfacing, railway platform surfacing, and hand or machine laid tarmac. Also offers road sweeper hire and cleaning…
Serves homeowners, businesses, construction clients and local authorities in Merthyr Tydfil and across South Wales, including buyers responsible for driveways, car parks, highways, footways and…
Financial Health
StableStable · 0% CAGR over 5y
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Computed from 5 filingsProvides engineering, construction and maintenance services for infrastructure and energy projects, including power transmission and distribution, tunnelling, rail and transport works, water and…
Serves large infrastructure owners, utilities and major contractors in energy, transport, water, natural resources and oil and gas, including public sector and regulated network operators across the…
Financial Health
StrongStrong · 0% CAGR over 2y
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Computed from 5 filingsProvides multi-utility installation and civil engineering services for telecoms and energy networks, including fibre optic installation, cable blowing and splicing, HV and LV cable laying and…
Serves B2B utility and telecoms customers, including network operators, fibre broadband providers, developers and contractors needing multi-utility, FTTP/MDU, HV/LV and civils project delivery…
Financial Health
StrongStrong · Growing, Hiring · 73% CAGR over 4y
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Computed from 4 filingsProvides civil engineering and construction services including building, refurbishment, design-and-build projects, and maintenance works. Uses in-house trades and plant to deliver infrastructure and…
Serves businesses, industrial operators and local authorities in South Wales and across the UK, including clients in steel, mines, quarries, heavy and light industrial, civil and building sectors.
Financial Health
HealthyHealthy · Profitable · -1% CAGR over 3y
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Computed from 3 filingsProvides civil engineering and groundworks services including utilities installation, construction support, hard landscaping and paving, site investigations, water and rail works, biomass-related…
Serves public-sector local authorities and B2B construction clients, including main contractors and housing contractors, on framework, private and bespoke contracts across the UK and Ireland.
Financial Health
StableStable · 0% CAGR over 2y
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Computed from 5 filingsProvides civil engineering and groundworks services for construction and utility projects, including multi‑utility mains installation, network repair and maintenance, trenchless engineering, EV…
Sells to businesses and infrastructure project buyers in construction, civil engineering and utilities, including organisations needing plant hire, groundworks, multi-utility installation and network…
Financial Health
HealthyHealthy · -77% CAGR over 4y
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Computed from 5 filingsProvides civil engineering contracting services, delivering infrastructure and construction projects including drainage systems, culverts, access paths, cycleways and public realm works, as well as…
Serves public-sector bodies, local authorities, community organisations and private-sector clients needing civil engineering and infrastructure works, including drainage, access, active travel, parks…
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StrongStrong · Growing · 0% CAGR over 4y
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Computed from 3 filingsProvides specialist construction contracting services including structural concrete repair and protection, structural waterproofing systems, ground gas protection, grouting and resin injection. Also…
Serves main contractors, structural engineers, developers and asset owners in the UK construction and infrastructure sectors, with regional emphasis on Wales and South West England for urgent works.
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StrongStrong · Growing, Hiring · 6% CAGR over 2y
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Computed from 5 filingsProvides civil engineering and construction services including concrete and tarmac surfacing, groundworks, excavation, drainage installation and repair, foundation laying, concreting, and earth…
Serves commercial and industrial organisations, construction project owners and local authorities across South Wales, including Bridgend, Newport, Cardiff and Swansea.
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StableStable
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Computed from 5 filingsInstalls and maintains street lighting, road signage, and other exterior lighting systems. Provides cable installation and related electrical works for property developers, civil engineering…
Serves property developers, civil engineering contractors, landscape companies, local government bodies and PFI contractors needing street lighting, signage and exterior lighting installations.
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StrongStrong
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Computed from 4 filingsProvides industrial waste management and asset recycling services for industrial sites, including landfill management and waste reporting. Also delivers civil engineering and infrastructure works,…
Serves major UK industrial and production sites, utilities and energy infrastructure firms, EPC/O&M contractors, developers, and businesses needing waste management, plant hire, construction and…
Financial Health
HealthyHealthy · -9% CAGR over 3y
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Computed from 2 filingsProvides temporary traffic management services for roadworks, utilities, construction and events. Installs road closures, contraflows and temporary signage, produces CAD traffic management plans, and…
Serves B2B and public-sector clients in utilities, construction, rail, highways, local authorities and events that need traffic and pedestrian management support for worksites, road closures and…
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StableStable · 0% CAGR over 1y
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Computed from 5 filingsProvides railway track design, manufacture, installation, maintenance and repair services. Supplies rail materials, welding and fabrication, surveys, labour and call‑out support for industrial,…
Serves rail infrastructure owners, operators and contractors across the UK and beyond, including industrial sites, mainline rail networks, heritage railways and narrow-gauge railway operators.
Financial Health
HealthyHealthy · -67% CAGR over 4y
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Computed from 5 filingsProvides mechanical engineering and industrial pipework services, including design, fabrication and installation of steel pipework systems and process equipment. Delivers turnkey engineering projects…
Serves utility companies, water and wastewater treatment operators, principal contractors and industrial organisations needing engineered pipework and fabrication support for capital projects and…
Financial Health
HealthyHealthy · -64% CAGR over 4y
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How Cardiff Infrastructure companies work and how to sell to them
What they do
Cardiff infrastructure firms usually earn revenue through project delivery, framework call-offs, subcontract packages and maintenance agreements. Pricing tends to combine fixed-price works, schedule-of-rates contracts, day-rate labour, plant hire recovery and variation claims once site conditions change. The service shape is practical and asset-adjacent: surveys, design coordination, civil works, utilities support, installation, inspection, repair and ongoing facilities or network maintenance. Margins often depend on estimating discipline, labour utilisation, materials procurement and the ability to control subcontractor risk. A smaller share may add advisory or asset-management services, but most commercial value still sits in getting field work specified, approved, delivered and signed off.
Who they sell to
Most buyers are public-sector estates teams, local authority procurement units, infrastructure owners, main contractors, utilities-related programme teams and commercial landlords. Decision-makers are rarely a single sponsor; contracts tend to involve procurement managers, project managers, quantity surveyors, operations directors, technical consultants and finance approvers. Smaller works may be won through direct relationships or preferred-supplier lists, while larger packages usually move through frameworks, tenders and formal pre-qualification. Sales cycles can be slow because buyers assess insurance, accreditations, prior delivery, method statements, safety management and subcontractor control before price. Credibility is built through evidence of completed work rather than broad brand claims.
What they buy
Most Cardiff infrastructure firms tend to spend on tools and services that reduce delivery risk, speed up bidding or improve control of dispersed field teams. Relevant categories include estimating and take-off software, project cost control, job management, workforce scheduling, fleet and plant tracking, document control, health and safety management, compliance administration, finance systems and customer relationship management for framework opportunities. They also buy professional services around bid writing, contract review, insurance, payroll, recruitment, training and accountancy. Where work involves utilities, telecoms or energy assets, suppliers that can help with asset records, site reporting, mobile workflows and audit trails are likely to find more practical entry points than abstract productivity claims.
Why and how to sell to them
Infrastructure buyers tend to evaluate vendors when tender volumes rise, a framework place is won, a new operations lead joins, field headcount expands, or margins are being eroded by rework, claims disputes and late paperwork. Useful outbound usually starts with a concrete operational problem: missed variation recovery, slow quote turnaround, poor visibility of subcontractors, duplicated site records, labour scheduling gaps or evidence packs taking too long to assemble. Cardiff firms are likely to respond better to sector-specific proof, low-disruption implementation and clear fit with public-sector procurement than to broad growth messaging. The sales case should connect cost control, compliance evidence and faster job completion.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
How many infrastructure companies are there in Cardiff?
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Which are the largest infrastructure companies in Cardiff?
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