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Infrastructure Companies in Swansea: 108 Active Firms (2026)
Infrastructure companies in Swansea plan, build and maintain the physical and digital systems that support the city and its surrounding economy.
Public-sector clients and utilities sit at the centre of demand, with communications and energy customers adding specialist work where technical assurance matters. Engagements tend to look like framework lots, subcontract packages, planned maintenance contracts or design-and-build tasks, with budgets closer to project delivery than low-cost advisory retainers. The better-qualified suppliers are usually small to mid-market operators with site delivery capability, engineering or inspection skills, and enough administrative capacity to handle tendering, insurance, documentation and aftercare.
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Swansea has 108 actively trading infrastructure companies, a local cohort that looks more like a project-delivery base than a headquarters market for national asset owners. The employment footprint reaches 827 reported roles, so the sector is not simply a register of sole-trader vehicles. Most activity appears likely to sit around construction-linked infrastructure, utility-facing work, property support, transport maintenance and communications provision across Swansea and South Wales, with larger contracts likely to be won through frameworks, partner roles or subcontracted delivery rather than spot purchasing.
Infrastructure suppliers in Swansea usually face a mix of project-specific obligations rather than a neat licence regime. Public-sector work brings procurement requirements, planning permission, environmental constraints, building control, health-and-safety duties and contract documentation; utility, energy and communications work adds asset-owner standards and access rules. Market structure also matters: many local providers will be subcontractors inside wider capital works or maintenance programmes, so cash-flow timing, retention clauses, insurance cover and accreditation can be as important as the technical scope. For researchers, buyer identity and contract route are central to judging comparability within the cohort.
Swansea’s infrastructure cohort appears weighted towards specialist delivery firms rather than large platform operators or national contractors. Demand tends to be anchored in public works, utility maintenance, property schemes, transport links and communications upgrades, which can lengthen sales cycles but also produce repeat work once supplier status is established. Scarcity is likely to sit in businesses with enough technical labour, certification and contract history to take on broader packages. Consolidation may occur where smaller subcontractors face insurance costs, skills pressure and compliance overheads, though local delivery knowledge should keep acquisition patterns selective.
108
Active firms
2026
5
Above £5M turnover
larger operators
20
Since 2022
newer incorporations
Key facts
About 4% of the trading cohort reports turnover above £5M (5 of 108 firms) — the rest sits below that revenue band.
18% of the cohort was incorporated since 2022 (20 firms), so a sizeable share is in its first few filing cycles.
Demand tends to be project-led and contract-based, with work linked to maintenance cycles, development projects and keeping existing networks operational.
Buyers include local employers, public bodies and household-facing service providers that rely on physical and digital infrastructure.
B2B mapping is likely to be most useful around regional suppliers and specialist operators rather than national-scale contractors.
Top Swansea Infrastructure companies
KAYMAC MARINE & CIVIL ENGINEERING LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides marine and civil engineering contracting services, including commercial diving, repair and maintenance of marine infrastructure, coastal and inland waterway engineering, installation of…
Serves UK-wide infrastructure asset owners and operators in rail and transport, water utilities, nuclear and energy, highways, environmental bodies, and marine ports and harbours.
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 2y
Location
Provides building and civil engineering services, delivering residential, commercial and industrial construction projects and infrastructure works such as roads, drainage, utilities and environmental…
Serves public and private sector clients across the UK, including organisations commissioning residential, commercial and industrial developments, infrastructure works, and framework-based…
Financial Health
Insufficient historyInsufficient history
Location
SEA-LIFT DIVING LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial diving and marine civil engineering services, including underwater inspections and surveys, cutting and welding, demolition and salvage, confined space rescue, ROV operations,…
Serves commercial, civil engineering and marine-sector clients across the UK, including infrastructure owners, contractors, waterways operators and organisations with inland, inshore, offshore or…
Financial Health
StableStable · Hiring · 49% CAGR over 3y
Location
AD Technique Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
DK NETWORK ENGINEERING LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy
Location
Anthony D. Bates Partnership LLP
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides engineering and technical consultancy for dredging, harbour and offshore projects. Services include feasibility studies, surveys and investigations, dredging strategy, licensing and…
Serves organisations commissioning or delivering dredging and marine infrastructure projects, including harbour, offshore, coastal, inland waterway, land reclamation and beach replenishment clients…
Financial Health
StableStable · 0% CAGR over 2y
Location
G. M. Williams Plant Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -10% CAGR over 4y
Location
BEACONS ELECTRICAL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
EV Charging Innovations Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
SOUTH WALES RESURFACING AND GROUNDWORKS LTD
Trajectory
5y · 2021–NowFinancial Health
Insufficient historyInsufficient history
Location
LAKESIDE FLOOD SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures, supplies and installs flood defence systems for residential, commercial and infrastructure properties, including demountable and automatic flood barriers, flood doors and…
Sells to homeowners, business owners and property stakeholders needing flood protection, including commercial and industrial premises, utilities and infrastructure. Serves architects, environmental…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
Location
Premier Forecourts and Construction Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides specialist construction services for fuel forecourts, including installation, maintenance and refurbishment. Also installs EV charging infrastructure and delivers construction, fit‑out and…
Serves blue-chip businesses and public sector bodies across the UK, including fuel forecourt operators, EV charging clients, retailers, commercial property owners and organisations needing specialist…
Financial Health
StableStable · Profitable · 3% CAGR over 2y
Location
TOTAL TECHNOLOGY DESIGN PARTNERSHIP LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering and mechanical design consultancy services, including process plant, piping systems, pressure vessels, storage tanks, equipment skids, structural and fabrication design, and CAD…
Serves B2B clients in oil and gas, power, water and sewerage, food and process, and heavy engineering sectors, particularly organisations needing engineering design support for industrial plant and…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
Offshore Geotechnics Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
DRAKELOW BATTERY LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable
Location
HOWELLS CONSULTING ENGINEERING LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides engineering consultancy services for the construction and oil and gas sectors, including structural and civil engineering design, domestic and residential projects, project management, site…
Serves businesses and project owners in construction and oil & gas, including clients in agriculture, commercial, education, healthcare, leisure, residential and retail sectors.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
BISP CIVIL ENGINEERING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 94% CAGR over 2y
Location
JCR RAIL LIMITED
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
AKRIVIA ENGINEERING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Dean & Thomas Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Liberty Structural Engineering Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Rjm Controls Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
BARDIC CONSTRUCTION LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides residential and commercial construction services including new builds, extensions, renovations and refurbishments. Also undertakes civil engineering and groundworks such as tarmac…
Serves homeowners, landlords, commercial property owners, retailers, office occupiers and industrial or facilities managers seeking building contractors for residential, commercial and civils…
Financial Health
StableStable · 3% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides transport planning and highway engineering consultancy services, including site appraisals, transport assessments, travel plans, and detailed design of highway works for Section 278…
Serves property developers, landowners and development project teams across the UK involved in bringing development sites through planning and highways approval.
Financial Health
WeakWeak
Location
H G R Carpentry Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Rees Bros (Damp Proofing) Swansea Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
P R BEYNON (CONTRACTORS) LIMITED
Trajectory
5y · 2021–NowFinancial Health
Insufficient historyInsufficient history
Location
SOUTH HAVEN CONSTRUCTION LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 5y
Location
R. Hills Construction Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services specialising in groundworks, drainage systems and highway works, including site preparation, infrastructure installation and related contracting…
Serves construction and infrastructure clients across South Wales, including organisations procuring groundworks, drainage and highways contracting services.
Financial Health
StrongStrong · Hiring · 18% CAGR over 4y
Location
Nolan Roadmarking Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides road marking and surface treatment services for highways and off‑highway areas, including line marking, high‑friction surfacing, retexturing, crack and joint repair, road stud installation,…
Serves Welsh local authorities, highway contractors, businesses and public/private sector site owners needing highway, car park, playground, sports court and off-highway surface markings.
Financial Health
HealthyHealthy · -88% CAGR over 2y
Location
QUINSHIELD LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsManufactures prebuilt glass reinforced plastic (GRP) composite buildings used as infrastructure enclosures. Supplies turnkey modular structures engineered for utility sectors including gas, water,…
Serves B2B and public-sector infrastructure buyers across UK utility sectors, including gas, water, electricity, nuclear, rail and renewables, typically utilities, operators and contractors…
Financial Health
HealthyHealthy · 1% CAGR over 5y
Location
J D Marine & Sons Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marine contracting and civil engineering services, including marine vessel operations, vessel hire and charter, and vessel transfers. Also undertakes welding and fabrication and delivers…
Serves B2B clients commissioning marine or land civil engineering projects, including construction and marine infrastructure operators needing specialist contractors, fabrication support, and work…
Financial Health
StableStable
Location
RNA Plant Limited
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides highway maintenance services including road sweeping and road planing using cold milling machines. Operates a fleet of sweepers, tippers and low loaders, and offers vehicle workshop services…
Serves B2B customers in highways maintenance, road surfacing and HGV fleet operations, with an emphasis on contractors and operators in Wales.
Financial Health
HealthyHealthy · Growing · 0% CAGR over 3y
Location
Crynant Plant Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plant and construction contracting services including groundworks, civil engineering, enabling works, haulage and transport services, and skip hire for public sector and private sector…
Serves public sector organisations, construction and civil engineering contractors, property developers, local businesses, and private domestic customers needing skip hire, groundworks, transport or…
Financial Health
HealthyHealthy · Hiring · 26% CAGR over 4y
Location
T.RICHARD JONES (BETWS) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides building contracting, plant hire, and construction services. Undertakes civil engineering and demolition projects, and builds facilities including housing, offices, industrial and retail…
Serves public and private sector construction clients, including education providers, emergency and health services, industrial, commercial and retail organisations, offices, care facilities, housing…
Financial Health
StableStable · -7% CAGR over 4y
Location
Astoria Project Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
E. J. THOMAS & SON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and groundworks services including earthworks, drainage and culvert installation, quarrying and haulage. Undertakes environmental and forestry projects such as cycle paths,…
Serves businesses, landowners and private clients needing civil engineering, groundworks, forestry, environmental and renewable energy project support, including wind farm developers and clients…
Financial Health
StrongStrong · Growing, Hiring · 26% CAGR over 4y
Location
Crynant Plant and Construction Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction and civil engineering services including groundworks, enabling works, plant and transport services, and skip hire for public and private sector construction projects and clients.
Serves public sector organisations and private customers requiring construction, civil engineering, groundworks, transport, enabling works and skip hire services.
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
BURKE CONTRACTS LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and plant hire services, including road drainage, earthworks, groundwork, and road construction. Supplies excavators, dumpers, rollers and other heavy equipment, and…
Serves construction contractors, infrastructure developers, wind farm developers and public sector project teams needing civil engineering, drainage, groundworks and plant hire support across the UK…
Financial Health
StableStable · -9% CAGR over 2y
Location
DE LANGE HOLDINGS LIMITED
Trajectory
5y · 2020–NowDesigns and supplies aluminium columns and structural solutions for lighting, rail signalling and infrastructure projects. Provides standard and bespoke aluminium products, including raise-and-lower…
Serves B2B and public-sector infrastructure buyers in the rail, highways and private development sectors, including contractors, consultants, manufacturers and infrastructure specialists needing…
Financial Health
Insufficient historyInsufficient history
Location
CONCRETE STRUCTURES & FLOORS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides concrete construction services including structural frames, ground-bearing slabs, concrete flooring, civil engineering works, and patterned concrete installations. Acts as a subcontractor on…
Serves main contractors, developers and construction project teams on commercial, residential, infrastructure and civil engineering projects, from small slabs to multi-storey structures.
Financial Health
WeakWeak · -67% CAGR over 4y
Location
AMC & SONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 19% CAGR over 4y
Location
John Williams & Co.(Crwbin Quarries) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · Hiring · 3% CAGR over 4y
Location
ALLPIPES CIVILS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · -89% CAGR over 2y
Location
O.P.WELDING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · 0% CAGR over 1y
Location
DJ & SON UTILITIES LIMITED
Trajectory
2y · 2025–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · 0% CAGR over 1y
Location
Accur8 Building And Project Management Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Abbey Utilities Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 5y
Location
Ian Thomas Construction Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction services including civil engineering works, general groundworks, and turnkey housing developments. Manages projects from land acquisition and site preparation through to…
Serves construction clients in South West Wales, including property developers, landowners and contractors needing civil engineering, groundworks or turnkey housing development support.
Financial Health
StableStable · -8% CAGR over 4y
Location
W A BOWLER LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services, specialising in groundworks and drainage. Carries out sewer connections and maintenance for Welsh Water systems, and undertakes building projects…
Serves homeowners, builders, developers and construction project owners, from small local jobs to major national works, including customers needing approved Dwr Cymru Welsh Water sewer connections.
Financial Health
StableStable · 0% CAGR over 4y
Location
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How Swansea Infrastructure companies work and how to sell to them
What they do
Revenue usually comes from contracted delivery rather than unit sales. Swansea infrastructure firms tend to price work as fixed-price packages, day-rate labour, scheduled maintenance agreements, call-off work under framework contracts, or measured works against a bill of quantities. Their offer is normally a blend of engineering labour, site supervision, materials procurement, testing, documentation and aftercare. Margins depend on estimating accuracy, utilisation of skilled crews, subcontractor control and how well variations are recorded. For suppliers selling into them, the commercial centre is often the contract manager or operations director, not a generic office buyer.
Who they sell to
Most sell to councils, housing bodies, utility asset owners, civil engineering contractors, property developers, facilities managers and communications providers across Swansea and South Wales. Buying decisions typically involve procurement teams, project managers, quantity surveyors, operations directors, health-and-safety managers and finance leads. Smaller jobs may be sourced through approved supplier lists or relationship-led subcontracting, while larger packages tend to move through tender portals, framework lots, pre-qualification questionnaires and formal bid scoring. Sales cycles are usually measured in months where public money, site access, insurance and method statements need approval before work starts.
What they buy
Most infrastructure firms tend to spend on tools that reduce project leakage and keep site delivery auditable. Relevant categories include estimating and bid-management software, project costing, field-service scheduling, fleet and plant tracking, health-and-safety compliance systems, document control, workforce management, accounting, credit control and customer relationship management. They also buy insurance advice, contract law support, accreditations, training, recruitment, temporary labour, payroll support, marketing for framework visibility, and IT services for mobile field teams. Cybersecurity and data backup matter where firms handle drawings, asset information, public-sector documentation or utility access credentials.
Why and how to sell to them
Infrastructure buyers tend to evaluate new suppliers when contract volumes rise, a framework place is won, retention cash becomes harder to manage, or delivery errors start affecting margins. Other useful triggers include new senior operations hires, depot moves, fleet additions, apprenticeship hiring, accreditation work, insurance renewal, and expansion from subcontracting into direct public-sector work. Outbound messages usually land better when they connect to measurable delivery issues: fewer missed site visits, cleaner variation evidence, faster tender responses, safer documentation, reduced rework or tighter debtor control. Generic productivity claims are less persuasive than proof that a similar contractor saved time on site administration or bid preparation.
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.
Also in Swansea
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Frequently asked questions
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