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Infrastructure Companies in Southampton: 167 Active Firms (2026)
Infrastructure companies in Southampton build, maintain and operate essential transport, utilities and built-environment assets across the city region.
Buying activity clusters around estates and facilities teams, transport operators, utility and network asset managers, and public-sector procurement desks. Suppliers tend to sell delivery capacity rather than discrete products: planned maintenance, civil works, network access, site support and specialist construction packages. Customer relationships are usually contract-led, with pre-qualification, insurance, safety credentials and delivery references carrying more weight than brand visibility. The better-fit firms for this page are not advisory-only consultancies; they have engineering staff, field teams and contract-management functions able to take responsibility for works in and around Southampton.
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Southampton has 167 actively trading infrastructure companies, giving the city a defined local supplier base across civil contracting, utilities support, facilities operations and built-environment services. Reported headcount across the cohort totals 896 people, so the visible workforce is weighted towards delivery and maintenance activity rather than office-only advisory work. Commercial demand is likely to sit around local authority work, transport and network maintenance, private estates contracts and subcontracted packages under larger capital programmes, with a smaller group operating at higher turnover thresholds.
Public-sector procurement and regulated-asset contracting shape much of the operating context, even where the company is privately owned. Buyers tend to ask for evidence of insurance, safety systems, site competence, environmental controls and project governance before price becomes decisive. Planning consent, highways approvals, building control and permit-to-work regimes can also slow delivery, especially where works affect transport corridors, utilities access or occupied estates. Smaller contractors often depend on subcontract positions within larger frameworks, which can improve workflow visibility but may compress margins and lengthen payment cycles.
Demand appears tied less to discretionary expansion than to the continuing need to maintain transport links, utilities access, commercial estates and public assets. The cohort tends to favour practical delivery businesses over asset-light software or advisory models, which makes labour availability, site supervision and working capital central constraints. Scale-up scarcity may persist where contract risk is hard to finance, while consolidation is more likely around specialist subcontractors, maintenance operators and firms with repeat access to public-sector or regulated-asset work.
167
Active firms
2026
12
Above £5M
reported revenue
34
Newer firms
incorporated since 2022
Key facts
About 7% of the trading cohort reports turnover above £5M (12 of 167 firms) — the rest sits below that revenue band.
20% of the cohort was incorporated since 2022 (34 firms), so a sizeable share is in its first few filing cycles.
Southampton infrastructure work spans transport services, utilities, civil engineering, facilities and built-environment operations.
Maintenance, compliance, replacement cycles and contracted support sit alongside new-build activity in this market.
Business models tend to split between labour-intensive service provision, specialist contracting and asset or service vehicles.
The city-region base links infrastructure activity to local transport and utilities assets rather than a single product market.
Top Southampton Infrastructure companies
P. T. CONTRACTORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building and civil engineering services, delivering construction and project management for infrastructure projects including high‑voltage substations, fuel storage facilities, and utility…
Serves private developers, businesses and community partners, particularly energy and utility infrastructure clients commissioning substations, fuel farms and other construction-led infrastructure…
Financial Health
StableStable · -67% CAGR over 4y
Location
JB Utility Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
WB CIVIL & MECHANICAL LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides pipeline engineering and construction services for oil and gas infrastructure, including pipework fabrication, pipeline diversion design, installation and repair, composite pipeline repairs,…
Serves B2B and public-sector buyers in pipeline infrastructure, including oil and gas pipeline operators, energy asset owners, utilities, civil engineering contractors and highway authorities.
Financial Health
WeakWeak · -2% CAGR over 4y
Location
K.E.R Civil Groundworks Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
CHANGEREGARD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and groundworks contracting services, including earthworks, foundations, reinforced concrete frames and basements, drainage and sewer installation, roads and surfacing,…
Serves national housing developers and property development clients across the south coast, including Hampshire, Dorset, Wiltshire, Berkshire, Surrey and Sussex.
Financial Health
HealthyHealthy · -68% CAGR over 4y
Location
Graham Installations Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy
Location
STRANDHILL PROPERTY DEVELOPMENT LIMITED
Trajectory
5y · 2021–NowProvides groundwork and civil engineering services for residential housing developments, including site clearance, bulk excavation, road construction, drainage installation, foundations, retaining…
Serves national speculative housing developers and housebuilders delivering residential sites of 2-100 units across Hampshire, Surrey, West Sussex, Berkshire and Buckinghamshire.
Financial Health
Insufficient historyInsufficient history
Location
SOLENT PROTECTIVE COATINGS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides industrial surface preparation, blasting, painting and protective coating services, including fireproofing, powder coating and metal fabrication. Works on infrastructure and industrial…
Serves B2B and public-sector clients in rail, petrochemical and gas, marine, highways, defence, government, energy facilities and wider construction sectors, including infrastructure owners,…
Financial Health
WeakWeak · -66% CAGR over 4y
Location
WILLIAMS TUCKER LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong · Hiring · 50% CAGR over 1y
Location
I M Currie Formwork Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides steel fixing, formwork, and concreting services for reinforced concrete construction. Installs reinforcement, builds temporary formwork systems, and places and finishes concrete for…
Serves construction contractors, property developers, housing providers and commercial project owners in the South of England requiring reinforced concrete specialists for building and infrastructure…
Financial Health
HealthyHealthy · Hiring · 11% CAGR over 4y
Location
AJP Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
C&D Plant & Construction Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides construction and civil engineering services including groundworks, drainage installation, general building works, demolition and strip‑out. Also offers plant hire and undertakes housing and…
Serves construction clients, property developers and housing development organisations needing contractors for groundworks, drainage, civil engineering, demolition, plant hire and general…
Financial Health
WeakWeak · -10% CAGR over 4y
Location
RP WINDOWS & BUILDING SERVICES LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -16% CAGR over 4y
Location
VKM INFRASTRUCTURE CONSULTANT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
KMP LOGISTICS LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
CJC RAILS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed
Location
SMITH & WEBB LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides borehole drilling and percussion boring services for water supply, soakaways, pollution monitoring and site investigation. Installs and services borehole pumps and submersible pumping…
Serves civil engineers, contractors, local authorities, consulting engineers, architects, agricultural and industrial sites, and residential customers needing borehole, water supply and pumping work.
Financial Health
WeakWeak · Hiring · 2% CAGR over 4y
Location
Ryan Contracting UK Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 5y
Location
SLH Contractors Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
WN CONSTRUCTION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Jane Field Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Solent Streetworks Consultants Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 5y
Location
Chapter 16 Civils Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
MEB ENGINEERING SERVICES LIMITED
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Solent Contracting Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
G Fletcher Plant Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plant hire and repair services for construction machinery, including servicing, maintenance and breakdown repairs, as well as commercial equipment repairs, supporting construction and…
Serves construction and civil engineering businesses using plant machinery and commercial vehicles, including road and motorway contractors.
Financial Health
StableStable · Hiring · 11% CAGR over 4y
Location
PETER TM LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
Earlcoate Properties Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and coastal defence construction services, including groundworks, drainage, piling, reinforced concrete structures, seawalls, dredging and river works. Also supplies plant…
Serves public and private-sector infrastructure clients, including local authorities, airports, ports, harbours, marinas, transport hubs, waste facilities and environmental or flood management bodies…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
Oliver Cutts Estates Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and coastal defence contracting services, including groundworks, drainage, piling, reinforced concrete structures, river and shoreline protection works, and infrastructure…
Serves public-sector bodies, framework partners and commercial infrastructure owners in Hampshire and Dorset, including airports, ports, harbours, marinas, transport hubs, waste facilities and…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
EIS SERVICES GROUP LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides infrastructure and facilities contracting services for rail, highways and utilities sectors, including vegetation management, fencing installation, rope access works, industrial coatings,…
Serves B2B infrastructure and facilities clients in the rail, highways and utilities sectors, including organisations needing compliant contractors for site, asset and maintenance-related works.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides rail engineering and infrastructure services, delivering turnkey railway projects focused on signalling and power systems. Activities include electrification and plant works, civil…
Serves UK rail infrastructure clients, including Network Rail, route managers and rail project delivery partners involved in signalling, power, civils, track and electrification programmes.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
AVON CONSTRUCTION LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and building contracting services, including design-and-build and subcontract work. Undertakes projects such as footbridges, rail and water infrastructure, coastal works,…
Serves public-sector and commercial infrastructure clients, main contractors and consultants commissioning bridge, rail, water, coastal, SANG, landscaping, building and minor works projects.
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 2y
Location
Integral Hire
Provides engineering, procurement and construction services for energy, water, nuclear and infrastructure projects, including process and civil design, MEICA engineering, automation and control…
Serves B2B and public-sector clients in the UK and overseas, including water utilities, energy operators, process industries, nuclear and defence organisations procuring engineering and construction…
Location
R&W Langley Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services including S278 infrastructure works, site clearance, pavement and carriageway construction, pipeline and deep drainage installation, earthworks,…
Serves property developers, main contractors, local authorities and statutory undertakers involved in infrastructure, housing and public-realm development projects.
Financial Health
StableStable · -13% CAGR over 4y
Location
SIENNA CONSTRUCTION LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides construction and civil engineering services, including building construction, refurbishment and infrastructure works. Undertakes power and utilities projects such as cable laying,…
Serves B2B and public-sector clients, including utilities companies, schools, offices, leisure facilities, housing providers, healthcare establishments and aviation-sector organisations.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 3y
Location
UTILI-LIGHT LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical and infrastructure contracting services, including highway lighting installation and maintenance, electric vehicle charging point installation, underground cable network works,…
Serves engineering consultants, property developers, facilities managers and public sector organisations requiring electrical, highway lighting, infrastructure, EV charging and underground cable…
Financial Health
StrongStrong · Growing, Hiring · 17% CAGR over 3y
Location
CORPORATION HOLDINGS LTD
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsProvides engineering design and infrastructure solutions for rail, highway, and major construction projects. Develops and supplies systems for safe access, network connections, and environmental…
Serves B2B infrastructure engineers, contractors and asset owners in rail, highways and major projects, including organisations managing networks where safe access and compliance are priorities.
Financial Health
DistressedDistressed
Location
TEMPORARY SITE MANAGEMENT LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering, groundworks and building services for public and private sector projects. Delivers construction and design-and-build works, building maintenance, installation and…
Serves public and private sector clients, including government bodies, NHS organisations, local authorities, utilities, facilities management providers, security services groups and construction…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Trant Engineering
Provides engineering, procurement and construction services, including project management, process, mechanical, electrical and civil design, automation and control systems, offsite manufacturing, and…
Sells to B2B and public sector clients delivering major engineering and infrastructure projects, particularly in energy, process and water, nuclear and defence, in the UK and overseas.
Location
R.M.S. Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides low‑carbon surface treatment products and services for highways and pavements, including asphalt preservation, surface dressing, microasphalt and footway treatments. Also offers consultancy…
Serves public-sector highways authorities and road infrastructure clients seeking sustainable road and pavement maintenance solutions across the UK.
Financial Health
WeakWeak · -9% CAGR over 4y
Location
Trajectory
1y · 2025–NowProvides engineering, procurement and construction services, including process, mechanical, electrical, instrumentation and civil design. Delivers automation and control systems, offsite…
Serves UK and overseas B2B and public-sector infrastructure clients, including water utilities, energy operators, nuclear organisations, defence bodies and industrial project owners managing capital…
Financial Health
Insufficient historyInsufficient history
Location
Steel Piling Solutions Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides steel sheet piling installation and related contracting services for construction and marine projects. Services include land and marine piling, silent piling, Movax piling installation and…
Serves construction firms, developers, civil engineering contractors and public-sector bodies across the UK, including clients involved in marine, flood-defence, railway, residential and commercial…
Financial Health
StableStable · -5% CAGR over 2y
Location
FIBRE WORKS UK (GODSTONE) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, builds, and installs fibre optic network infrastructure for residential properties, including multi‑dwelling and single‑dwelling units. Provides network planning, civil works, cabling, and…
Serves B2B fibre broadband operators and network infrastructure owners targeting MDU and SDU residential properties, with household residents involved during final installation.
Financial Health
StableStable · -9% CAGR over 4y
Location
Trant Engineering
Provides engineering, procurement and construction services, including process, mechanical, electrical and civil design, automation and control systems, offsite manufacture and assembly, and…
Serves B2B and public-sector clients delivering major engineering and infrastructure projects, particularly in energy, process and water, nuclear and defence sectors, in the UK and overseas.
Location
Blanchard Wells (Holdings) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides civil engineering and construction services specialising in reinforced concrete structures, residential groundworks, road building, drainage and substructures. Delivers project planning,…
Serves B2B construction clients, including property developers, housebuilders and main contractors across the South, with buyers such as construction directors and project teams delivering…
Financial Health
StableStable · -29% CAGR over 2y
Location
SEATECH COMMERCIAL DIVING SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides commercial diving services for marine and offshore projects, including underwater inspections and surveys, ship maintenance and repair, marine civil engineering support, salvage and…
Serves B2B and public-sector clients in marine, civil engineering, shipping, ports, terminals and renewables, including asset owners and operators requiring UK or international emergency support.
Financial Health
StableStable · 0% CAGR over 2y
Location
Chapter 8 Tm Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides temporary traffic management for roadworks and events, including lane closures, road closures with diversions, stop‑go control, convoy systems, and temporary traffic or pedestrian signals.…
Serves highways authorities, civil engineering and roadworks contractors, utilities, event organisers and other organisations needing temporary traffic management on motorways, dual carriageways and…
Financial Health
StrongStrong · Growing, Hiring · 255% CAGR over 4y
Location
ACS (Construction Services) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and construction services including industrial and commercial building projects, warehouse construction, groundworks and earthworks, and infrastructure works for energy and…
Serves UK businesses and infrastructure clients, including industrial and logistics operators, warehouse developers, major energy and utilities providers, renewables projects, commercial/retail…
Financial Health
DistressedDistressed
Location
R & D Surfacing Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides tarmac and asphalt surfacing services including driveways, roads and car parks. Also carries out resurfacing, patch repairs, playground surfacing, line marking, kerb laying, drainage works…
Serves homeowners, schools, retail units, office buildings, private estates, small housing developers and local authorities across Hampshire needing domestic, commercial or public-sector surfacing…
Financial Health
HealthyHealthy · -4% CAGR over 4y
Location
ALLROUND PLANT LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides groundworks and civil engineering services for construction projects, including site clearance, bulk excavation, earthworks, foundations and substructures, deep drainage, road and car park…
Serves housebuilders, housing associations, commercial developers and construction clients needing groundworks and civil engineering support, from one-off small projects to large residential and…
Financial Health
StrongStrong · Profitable
Location
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How Southampton Infrastructure companies work and how to sell to them
What they do
Southampton infrastructure firms usually earn from fixed-price works, schedule-of-rates maintenance, call-outs, framework lots and subcontract packages. Revenue is tied to labour, plant, materials, supervision and the documentation needed to satisfy client controls. Pricing can be lump-sum for scoped civil works, day-rate for site support, remeasurable for utilities and highways activity, or retainer-based for planned maintenance. Engagements tend to be operational rather than purely advisory: site mobilisation, access management, method statements, safety files, inspections, snagging and handover all sit close to the commercial model.
Who they sell to
Most sell to estates directors, facilities managers, transport and utility asset teams, local authority procurement officers, project managers and quantity surveyors. The buyer is usually trying to keep an asset available, compliant and within budget, not trial a speculative service. Smaller jobs may be won through repeat relationships and direct quotes, while larger public-sector or regulated-asset work tends to move through frameworks, approved supplier lists, RFPs and subcontract chains. Sales cycles can run from a few weeks for reactive support to several months where pre-qualification, insurance checks and client-side governance are involved.
What they buy
Most infrastructure firms tend to spend on tools and services that reduce friction between site delivery and office control. Common categories include estimating, tender management, project costing, field service scheduling, workforce timesheets, fleet and plant management, safety compliance, permit tracking, document control, payroll, accounting and credit control. They also buy recruitment, training, insurance, legal support, environmental services, waste handling, PPE, materials supply and subcontractor labour. For firms working near transport routes, utilities or occupied estates, evidence capture and audit trails often matter as much as headline productivity claims.
Why and how to sell to them
Infrastructure buyers tend to evaluate vendors when contract volume rises, a framework place is won, payment cycles tighten, or site teams outgrow manual reporting. Other triggers include new operations leadership, a move into regulated-asset work, certification renewal, fleet expansion or a backlog of compliance administration. Pitches usually land better when they connect to measurable delivery constraints: fewer missing site records, faster applications for payment, cleaner subcontractor onboarding, better visibility of labour and plant, or reduced rework after client inspections. Generic efficiency language is less useful than proof that a supplier understands project risk, margins and mobilisation pressure.
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 Southampton
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Frequently asked questions
How many infrastructure companies are there in Southampton?
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