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Civil Engineering Companies in Cardiff: 694 Active Firms (2026)
Civil engineering companies in Cardiff design, build and maintain transport, utilities, water and communications infrastructure across the metropolitan area.
Buying decisions tend to sit with public works teams, utility asset owners, developers and principal contractors rather than with facilities or estates buyers alone. Cardiff-based contractors in this field usually compete around framework places, reactive maintenance capability, site delivery capacity and design coordination for works across South Wales. Engagements are often package-based: drainage upgrades, highway works, utilities diversions, enabling works, structures repair or civils support on larger build programmes. The commercial centre of gravity is mid-market contracting, with compliance, health-and-safety documentation and subcontractor management carrying as much weight as design credentials.
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Cardiff has 694 actively trading civil engineering companies in this cohort, a compact local base set against the wider South Wales infrastructure market. Reported employment totals 1,350 people, which suggests many firms remain small delivery or specialist subcontracting businesses rather than full-service contractors. The turnover tail is thinner: 33 firms sit above £5M revenue, while 169 have been incorporated since 2022. That mix points to a market with plenty of small contractors and newer incorporations, but a smaller pool able to take on higher-value packages without leaning on consortium or subcontract arrangements.
Construction health-and-safety rules shape tendering as much as delivery. The Health and Safety Executive frames the Construction (Design and Management) Regulations around project notification, construction work, legal duties and defined responsibilities for clients, designers, principal contractors, contractors and workers. For Cardiff contractors bidding into utility, transport and public-works packages, that pushes competence evidence, risk documentation and role clarity into the procurement process. The Civil Engineering Contractors Association also gives the sector a trade-body voice across transport, energy, water, waste and communications infrastructure, which fits the contractor-led structure of much of the local market.
Future movement appears likely to come from procurement discipline rather than a sudden change in demand. Smaller Cardiff contractors tend to win work through specialism, relationships with principal contractors and local delivery capacity, while higher-turnover operators are better placed for framework roles and distributed programmes. Compliance pressure has been a persistent separator, especially where public bodies and regulated asset owners require clearer evidence of competence. Consolidation may continue at the margins, but the more visible pattern is likely to be gradual professionalisation among small civils firms trying to move beyond short-cycle subcontract work.
694
Active firms
2026
33
Above £5M
reported revenue
169
Since 2022
new incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (33 of 694 firms) — the rest sits below that revenue band.
24% of the cohort was incorporated since 2022 (169 firms), so a sizeable share is in its first few filing cycles.
CDM 2015 places legal duties on clients, designers, principal contractors, contractors and workers across construction and building work.
ONS construction statistics for Great Britain put construction new work at £140,684 million in 2024, up 1.4% in current prices.
New construction orders rose by 5.6% to £71,707 million in 2024, with private infrastructure increasing by 15.4%.
The Civil Engineering Contractors Association represents contractors working across transport, energy, water, waste and communications infrastructure.
OECD material on the United Kingdom’s 2024 Economic Survey says investment remains low in international comparison.
Top Cardiff Civil Engineering companies
Horan Surfacing Limited
Trajectory
3y · 2023–NowFinancial 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
ENCON CONSTRUCTION LIMITED
Trajectory
5y · 2019–NowFinancial sub-scores
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
Kordel Ltd.
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
TRIDENT CIVIL ENGINEERING LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
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
COLE CONTRACTORS CARDIFF LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
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
J.Fana Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Cummings (Civil Engineering) Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak
Location
GREAVES CIVIL ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
PAUL TOFT LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
C&S CIVILS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
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.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
G.T. Jones Contracting Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides site clearance, fencing installation, civil engineering works, and plant and machinery hire. Also installs underground cables and pipes using cable ploughing, and undertakes landscaping,…
Serves public and private sector clients, including infrastructure and construction project owners, utilities installing underground cables or pipes, developers, agricultural landowners, and…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
Dauson Environmental
Provides demolition, land remediation, recycling, and resource management services through a group of environmental and construction businesses. Activities include construction and site clearance,…
Serves businesses and public-sector bodies in Wales, including property developers, construction firms, landowners and organisations with environmental, construction, remediation or resource…
Location
Dauson Environmental
Provides waste recycling and resource management services, handling large volumes of construction and demolition materials. Part of a group delivering demolition, land remediation, soil supply, and…
Serves businesses and organisations with environmental, construction, demolition, remediation and resource-management needs, with an emphasis on projects and economic activity in Wales.
Location
DJE Developments Limited
Trajectory
3y · 2023–NowFinancial sub-scores
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…
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Alvio Civil Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
D. HERBERT (BUILDERS) LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
G W RICHARDS & SONS CONTRACTORS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -4% CAGR over 4y
Location
ELYSIUM CONTRACT SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Mid-Air Air Conditioning Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
UKFF Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
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.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
Location
Thortech International Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsInstalls specialist surfacing systems including anti-skid coatings, resin bound and resin bonded surfaces, epoxy flooring, and decorative aggregates. Provides surfacing for bridges, marine decks,…
Serves a mix of B2B, public sector and residential customers, including multinationals, SMEs, local authorities, ports, bridge and marine operators, housing/public area managers, and homeowners.
Financial Health
StableStable · -25% CAGR over 1y
Location
DENVER DRILLING SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
EXACT BMS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Growing, Hiring · 6% CAGR over 3y
Location
FLIN Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
VALLEY WATER SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides water infrastructure and utility engineering services including water mains renewal, pipe repairs, moling and leak detection, vacuum excavation, hydrant renewal, chamber construction,…
Serves a mix of residential customers, property owners, developers, construction contractors and utility-sector clients in South Wales and South West England.
Financial Health
HealthyHealthy · -73% CAGR over 4y
Location
Lg Networks & Civils Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
J G FRANCIS CIVIL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services including design, construction and refurbishment of commercial buildings and infrastructure. Works on logistics and warehousing facilities, retail…
Serves UK commercial and public-sector clients in logistics, warehousing, retail, education, waste-to-energy and aviation, including organisations with commercial building and infrastructure…
Financial Health
StrongStrong · Growing, Hiring · 32% CAGR over 4y
Location
THE VICTORIA (ABERGAVENNY) LTD
Trajectory
3y · 2023–NowFinancial sub-scores
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.
Financial Health
DistressedDistressed
Location
Marton (Civil Engineering) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
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.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Calibre Equip Limited
Trajectory
5y · 2021–NowFinancial sub-scores
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…
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
G Force Telecomms Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides telecommunications infrastructure services including overhead cable installation, fibre splicing, network build and maintenance, vacuum excavation, civil engineering, and surveying and…
Sells to telecoms operators, infrastructure contractors, and civil engineering firms needing network build, installation, and maintenance services. Also serves telecoms and civil engineering…
Financial Health
StrongStrong · Growing, Hiring · 30% CAGR over 4y
Location
INTERVENTION SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
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.
Financial Health
StrongStrong · Growing, Hiring · 13% CAGR over 4y
Location
WE HIRE LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering services for energy and utilities infrastructure, including cable duct and utility installation, excavations and earthworks, haul road construction, drainage, demolition,…
Serves UK renewables, energy and utilities clients, including developers and contractors involved in substations, transmission, battery storage, solar, wind farm, highway and wider infrastructure…
Financial Health
HealthyHealthy · -12% CAGR over 4y
Location
HORIZON CIVIL ENGINEERING LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
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
Location
Tom Prichard Contracting Limited
Trajectory
3y · 2023–NowFinancial sub-scores
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
Location
D & M GROUNDWORKS & UTILITIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides groundworks, civil engineering and utility installation services. Activities include excavation, foundations, drainage and concrete works, fencing and hard landscaping, plus installation,…
Serves utility suppliers, main contractors, fibre network installers, developers and domestic property owners across Wales and South West England.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Hayward Utility Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and enabling works for energy and industrial infrastructure projects. Services include site clearance, surveys, demolition, groundworks, reinforced concrete foundations,…
Serves B2B commercial and industrial project owners, developers and operators across the UK, especially in power generation, renewables, BESS, anaerobic digestion, water and sewage treatment.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
CMU INFRASTRUCTURE LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides gas infrastructure installation and connection services for housing developments and industrial or commercial projects. Services include pipeline installation, steel and hot-tap connections,…
Serves property developers, housebuilders, industrial and commercial organisations, and existing housing customers requiring gas and utility infrastructure connections with UK gas network owners.
Financial Health
WeakWeak · -9% CAGR over 3y
Location
NEWCONN CONTRACT SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
K M PLANT HIRE & GROUNDWORKS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
PRITCHARD CONSTRUCTION & GROUNDWORKS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and building contracting services, including groundworks, new build construction and building maintenance. Carries out rail infrastructure works such as structure repairs,…
Serves rail infrastructure clients, main contractors, developers and property or facilities owners requiring civil engineering, groundworks, new-build and building maintenance support.
Financial Health
StableStable · -24% CAGR over 2y
Location
LANGMEAD CONSTRUCTION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services, specialising in road and surface surfacing and resurfacing works. Also undertakes rail platform construction, including platform removal,…
Serves public sector highways departments, rail infrastructure clients and commercial civil construction buyers requiring surfacing, resurfacing, platform and civils works.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
R F BUILDING & UTILITIES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
Darlow Lloyd Plant Limited
Trajectory
4y · 2022–NowFinancial sub-scores
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
Location
C P Civil Engineering (UK) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
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
Location
NB CIVILS & SURFACING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and groundworks, road and surface construction including block paving, slabbing and tarmacing, and utilities installation and maintenance services covering electrical, gas…
Serves construction, utilities and infrastructure clients, including project owners and contractors with civils, surfacing and utility projects of varying sizes.
Financial Health
StableStable · Hiring · 11% CAGR over 4y
Location
K.G.J. PRICE (RAILWAY CONTRACTORS) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
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
Location
JORDAN CIVILS (WALES) LTD
Trajectory
3y · 2022–NowProvides civil engineering and groundworks services including hard landscaping, highway maintenance and utility works for commercial and domestic construction projects. Delivers infrastructure…
Serves construction contractors, property developers, infrastructure operators, industrial businesses and domestic customers across South Wales and the South West, with buyers in the civils and…
Financial Health
Insufficient historyInsufficient history
Location
Miller Contractors (Wales) Limited
Trajectory
5y · 2020–NowFinancial sub-scores
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
Location
South Wales Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
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.
Financial Health
StableStable
Location
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How Cardiff Civil Engineering companies work and how to sell to them
What they do
Revenue usually comes from priced works packages rather than recurring subscription income. Cardiff civil engineering contractors tend to earn through fixed-price tenders, measured-term contracts, framework call-offs, day-rate plant and labour, and variation orders when site conditions change. The service shape is practical delivery: groundworks, drainage, highways, utilities support, structural repairs, enabling works and site management. Some firms carry design coordination capability, but many make their margin through programme control, compliant site operations, subcontractor supervision and the ability to mobilise crews across South Wales at short notice.
Who they sell to
Typical customers include local authorities, utility asset owners, developers, housebuilders, principal contractors and public-sector delivery bodies. Buying groups usually involve project managers, commercial managers, quantity surveyors, procurement teams, health-and-safety leads and operational asset owners. Smaller jobs may be awarded through relationship-led quoting or maintenance call-offs, while larger packages tend to move through frameworks, approved supplier lists, formal tender portals or RFP processes. Sales cycles vary: reactive works can be decided quickly, but public works and regulated infrastructure packages often require pre-qualification, insurance evidence, method statements and competence documentation before price is considered.
What they buy
Most Cardiff civil engineering firms tend to spend on tools and services that reduce commercial leakage, control site risk and help them evidence competence. Relevant categories include estimating software, bid management, document control, project accounting, workforce scheduling, vehicle and plant tracking, health-and-safety management, training, insurance, payroll, recruitment, legal support and environmental compliance advice. Firms with design coordination roles may also buy CAD, surveying, geospatial, asset information and common data environment tools. Cloud storage, cyber security, mobile device management and finance systems matter because site teams, office staff and subcontractors often need access to the same job information.
Why and how to sell to them
Buying intent tends to appear when contractors move from short-cycle subcontracting into framework work, add compliance staff, take on larger packages or expand across South Wales. Other triggers include new commercial leadership, fleet growth, insurance renewal, repeat tender losses, an HSE-related incident, or pressure from a principal contractor to evidence site controls more clearly. Outbound messages usually land better when they connect to margin protection, faster tender responses, fewer document gaps, clearer audit trails or less time spent reconciling labour, plant and materials. Generic productivity language is weaker than a plain link to site delivery, risk and payment certainty.
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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