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Infrastructure Companies in Plymouth: 62 Active Firms (2026)
Infrastructure companies in Plymouth build, maintain and support physical and digital networks across the city and surrounding area.
Buying centres in Plymouth sit mainly with estates, facilities, highways, utilities and IT/network teams, rather than with a single infrastructure budget. Suppliers tend to sell to local commercial landlords, public-sector bodies, regulated operators and prime contractors that need delivery capacity close to the asset. Engagements are often practical and contract-led: planned maintenance, civil or utilities packages, fibre and network support, energy-system works, site services and emergency response. The customer relationship is usually won on accreditation, geographic cover, response times and evidence of previous project delivery, with smaller specialist teams feeding into wider public or commercial works programmes.
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Plymouth has 62 actively trading infrastructure companies, a modest local cohort for a city market and one shaped by service delivery rather than large balance-sheet operators. Reported employment stands at 431 people, which puts much of the footprint in small contractor, maintenance and technical-service teams. No firms in the cohort report turnover above £5M, so the market appears to rely on local specialists and subcontracted delivery rather than Plymouth-headquartered infrastructure owners. The presence of 15 companies incorporated since 2022 adds a younger layer, though scale remains comparatively limited.
Infrastructure work around Plymouth tends to be shaped less by a single regulator than by client-side compliance, public procurement rules, planning permissions, safety management and access to existing networks. Contractors serving regulated customers usually need auditable processes for site work, subcontractor control, emergency call-outs and handover documentation. The split between civil works, utilities, transport assets and digital networks also means procurement is fragmented: some work is tendered through public or anchor-client frameworks, while smaller jobs are placed through facilities, estates or operational teams. That structure favours suppliers that can evidence qualifications and local response discipline.
Future movement appears likely to be incremental rather than venture-style. Plymouth’s infrastructure cohort tends to look contractor-led, with activity tied to asset maintenance, public works, utilities resilience and digital connectivity needs. Scale-up scarcity may keep larger framework roles in the hands of external primes, leaving local firms to win specialist packages, response work and subcontracted delivery. Newer entrants may find room where clients need flexible local capacity, but margins are likely to remain exposed to labour availability, materials costs, accreditation requirements and the timing of public-sector procurement.
62
Active firms
2026
15
Since 2022
New incorporations
0
Over £5M
Revenue threshold
Key facts
24% of the cohort was incorporated since 2022 (15 firms), so a sizeable share is in its first few filing cycles.
Plymouth’s infrastructure market spans physical and digital networks, including maintenance, connectivity and technical support work.
Place-based infrastructure procurement tends to favour local delivery capacity, framework access and evidence of response coverage.
Fragmentation in local infrastructure services can suit buyers that need specialist contractors rather than national-scale asset owners.
Top Plymouth Infrastructure companies
Porteous Groundworks Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides groundwork and civil engineering services for construction projects, including site preparation, excavation, foundations, drainage installation, utilities, and related infrastructure works…
Financial Health
StrongStrong · Growing, Hiring · 53% CAGR over 2y
Location
BUDDHA UTILITIES LTD
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable
Location
Moore Construction Southwest Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
C D C Groundworks Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides commercial groundwork and civil engineering services including excavation, foundations, drainage and utility installation, site clearance and demolition, and concrete or yard works, using…
Serves commercial, industrial and construction clients, developers, estates and self-build homeowners needing groundwork and civil engineering contractors across Devon and Cornwall.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
CMS GEOSCIENCE LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides marine geotechnical and geophysical surveys and site investigations, including seabed sampling, hydrographic and environmental surveys, core analysis and storage. Also offers survey vessel…
Serves B2B and academic customers in marine and offshore sectors, including offshore wind developers, ports and harbour operators, marine civil engineering firms, environmental researchers,…
Financial Health
StrongStrong · Hiring · 32% CAGR over 2y
Location
FARAJ CONSULTING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides structural and civil engineering consultancy services, including structural design in steel, concrete and timber, highway and drainage design for housing developments, design of retaining…
Serves B2B and public-sector clients in property and construction, including housing developers, commercial and industrial projects, healthcare providers, office schemes and schools needing civil or…
Financial Health
StableStable · -4% CAGR over 4y
Location
Ewg Utilities & Civils Ltd
Trajectory
1y · 2024–NowFinancial Health
Insufficient historyInsufficient history
Location
KJWilderscapes Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Claremont Marine Services Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
4D CIVIL ENGINEERING SURVEYING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering surveying services including site engineering and setting out, topographical and land surveys, utility mapping, deformation monitoring, UAV aerial imaging, surface…
Serves contractors, consulting engineers, architects, quantity surveyors and private clients involved in construction and civil engineering projects across the South West.
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Go Mam Limited
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
Optical Civil Engineering Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Ajl Groundworks & Civil Engineering Ltd
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable
Location
Ace of Diamonds Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides specialist diamond drilling and concrete cutting services for construction and demolition projects, including diamond wire sawing, track sawing, diamond chasing, stitch drilling, concrete…
Serves building contractors, construction companies, local authorities, schools and domestic customers with construction-related requirements across Devon, Cornwall and the wider South West.
Financial Health
StableStable · 0% CAGR over 4y
Location
Marc Sealey Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Creation Groundworks Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
MOOR MANAGE (CM) LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 5y
Location
THE OLD STABLES MANAGEMENT COMPANY LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides civil engineering and utility infrastructure services, including construction and maintenance of gas, water and electricity networks, cross-country pipelines, sewerage and drainage systems,…
Serves B2B and public-sector buyers across the UK, including water, gas and electricity utilities, infrastructure operators, transport projects, universities, hospitals, defence sites and…
Financial Health
StableStable
Location
Millennium Marine Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides marine and civil engineering services including marine construction, commercial diving, underwater inspections and surveys, concrete placement and repairs above and below water, grouting and…
Serves civil engineering and marine infrastructure clients, including contractors, asset owners and public-sector bodies needing above- and below-water project support, mainly in South West England…
Financial Health
StableStable · -10% CAGR over 4y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides engineering consultancy, contracting and maintenance services, focusing on energy-related projects. Offers design, engineering and project delivery for infrastructure such as industrial…
Serves commercial, industrial and infrastructure clients needing engineering consultancy, contracting and maintenance, particularly in the energy sector, with project examples across transport, sugar…
Financial Health
HealthyHealthy · -3% CAGR over 4y
Location
BRODY FORBES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil and structural engineering consultancy including structural design, inspections and surveys for residential and commercial projects. Designs, fabricates and installs steel structures…
Serves homeowners, property developers, builders, commercial project clients, local government bodies, radar companies and defence organisations including the Ministry of Defence, in the UK and…
Financial Health
StableStable · -68% CAGR over 4y
Location
John Grimes Partnership Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides civil, structural, geotechnical and environmental engineering consultancy. Services include infrastructure and structural design, site investigations, transport and highway planning,…
Serves developers, commercial and industrial organisations, infrastructure owners and public-sector bodies needing engineering input on building, transport, coastal, utilities and heavy civil…
Financial Health
StableStable · -3% CAGR over 4y
Location
K.A.G.Projects Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Frederick Sherrell Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides geotechnical, geological and geoenvironmental engineering consultancy, including site and ground investigations, rock face and slope stability assessments, mining hazard reports, quarry…
Serves business and public sector clients needing geotechnical, geological and geoenvironmental expertise, including quarry operators, mining-related projects, infrastructure and coastal engineering…
Financial Health
StableStable · 0% CAGR over 4y
Location
Williams Southern
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and constructs petrol filling stations and forecourts, including fuel infrastructure upgrades and retanking. Provides retail construction and shopfitting, EV charging forecourt development,…
Serves B2B clients in the UK petrol forecourt, fuel retail, EV charging and retail property sectors, including operators and developers needing construction, refurbishment or design-and-build…
Financial Health
WeakWeak · -4% CAGR over 4y
Location
DANPOL CIVILS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
A W Webber Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Shore Defence Ltd
Trajectory
5y · 2023–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
TIDAL TURBINES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable
Location
GROUNDWORK SOLUTIONS (SW) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
FLOOD CONTROL INTERNATIONAL LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs engineered flood protection systems, including flood barriers, gates, doors and self-closing barriers. Also supplies spill containment barriers and provides flood…
Serves commercial, industrial and infrastructure organisations worldwide, including utilities, nuclear power stations, factories, corporate offices, hotels, shopping centres and residential block…
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
MODULAR CUBED LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and supplies precast concrete products for construction projects, including retaining walls, ground beams, lift shafts, dock levellers, stairs and stadium terracing, and…
Serves B2B construction customers, including contractors, developers, civil and structural engineers, groundworks teams and specifiers working on retaining wall, warehouse, distribution centre,…
Financial Health
StrongStrong · Growing, Hiring · 44% CAGR over 4y
Location
HIGH REACH ENGINEERING SERVICES LTD
Trajectory
5y · 2022–NowFinancial Health
Insufficient historyInsufficient history
Location
Marslands (SW) Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
EMPLOYEE OWNERS GROUP LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Pj Fox Driver Hire Limited
Trajectory
2y · 2025–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed
Location
TJBL LTD
Trajectory
1y · 2024–NowFinancial Health
Insufficient historyInsufficient history
Location
INTERLINK MARINE ENGINEERING SERVICES LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · -21% CAGR over 3y
Location
Crossways Construction Management Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · 0% CAGR over 3y
Location
Dart Surfacing Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides tarmacing and surfacing services for domestic and commercial clients, including road and driveway surfacing, concrete laying, and kerbing. Carries out installation and repair of paved and…
Serves domestic homeowners and commercial clients in the South Hams, including property owners and businesses with roads, driveways or surfaced areas to maintain.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
Location
W.J. AVERY AND COMPANY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -68% CAGR over 4y
Location
HMLR LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -16% CAGR over 4y
Location
JHB (UK) Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides road, car park, warehouse, playground and sports court line marking services. Installs safety markings, high‑friction anti‑skid surfacing, and resin‑bonded or decorative surfaces, and…
Serves local authorities, highways contractors, supermarkets, sports venues, offices, warehouses, schools, gyms and facilities managers across the UK needing road, car park, playground, sports court…
Financial Health
StrongStrong · Hiring · 24% CAGR over 4y
Location
DART PLANT SERVICES LTD
Trajectory
4y · 2021–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong
Location
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How Plymouth Infrastructure companies work and how to sell to them
What they do
Most Plymouth infrastructure suppliers earn through project fees, term maintenance contracts, scheduled call-outs and subcontracted work packages rather than recurring licence income. Pricing is usually fixed-price for defined works, schedule-of-rates for frameworks, day-rate for specialist labour, or cost-plus where materials and access risks are hard to pin down. The offer is a mix of physical delivery and technical assurance: surveys, design support, installation, repair, testing, handover packs and standby cover. Revenue quality often depends on keeping crews utilised, controlling variations, recovering materials costs and being invited back for the next estate, network or asset programme.
Who they sell to
Typical buyers are estates managers, facilities heads, asset managers, highways officers, utilities operations teams, IT/network managers and project managers inside prime contractors. Smaller jobs are often won through direct relationships, site visits and fast quoting; planned works usually move through procurement portals, framework agreements or formal tender packs. Public-sector and regulated customers tend to ask for insurances, accreditations, method statements, risk assessments, references and evidence of near-site response capacity. Sales cycles therefore range from short repairs and emergency cover to longer tender processes, with technical credibility and documentation carrying as much weight as headline price.
What they buy
Most firms in this segment tend to buy around operational control before anything more speculative. Common spend areas include estimating and job-costing systems, field-service scheduling, asset and document management, accounting, payroll, fleet management, mobile workforce tools, health and safety administration, training, certification support and bid-writing help. Contractors with network or utilities exposure may also need cyber controls, monitoring, test equipment, mapping, telecoms tooling and secure file exchange. Non-software sellers can find demand in plant hire, vehicle leasing, PPE, waste handling, insurance, legal support, recruitment and subcontract labour, especially where workload arrives in packages rather than through a smooth monthly pipeline.
Why and how to sell to them
Infrastructure buyers tend to evaluate new suppliers when contract activity exposes an operational bottleneck: a framework win, a new maintenance area, a backlog of reactive jobs, a supervisor hire, an accreditation renewal or a move into fibre, utilities or energy-system work. Cash collection and margin control are regular pressure points, because materials, labour and access costs can shift between quote and delivery. Outbound angles work better when tied to proof of delivery: fewer missed visits, cleaner handover files, faster quotes, clearer subcontractor control or less time spent preparing tender evidence. Generic productivity claims are easy to ignore; specific reductions in admin, rework or audit risk are easier to test.
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 Plymouth
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Frequently asked questions
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