Turn this list into pipeline.
Civil Engineering Companies in Swansea: 295 Active Firms (2026)
Civil engineering companies in Swansea design, build and maintain transport, utilities, water, waste and communications infrastructure.
Buying activity tends to sit with local authorities, utility asset owners, framework managers and principal contractors rather than end consumers. The work is usually sold as bid-led packages: highways enabling works, drainage, groundworks, utilities reinstatement, maintenance and subcontracted delivery on wider infrastructure programmes. A good commercial fit is a regional contractor with enough supervision, plant coordination and subcontractor management to handle regulated sites across South Wales, while still being close enough to Swansea to respond to call-off work. Engagements tend to be governed by framework terms, site programmes and health-and-safety documentation rather than simple purchase orders.
Read more
Swansea has 295 actively trading civil engineering companies, making this a contractor-heavy but fairly granular local market. Reported headcount across the cohort totals 793. That shape matters for researchers comparing suppliers: much of the cohort is likely to comprise specialist subcontractors or owner-managed contractors rather than full-service infrastructure groups. Mid-market operators are therefore a narrower subset, usually identifiable by repeat framework work, site-management capacity and evidence of turnover rather than incorporation alone.
UK civil engineering work sits inside the construction health-and-safety regime, with HSE guidance on the CDM rules covering project notification, construction work, legal duties and the allocation of client, designer, principal contractor, contractor and worker responsibilities. For Swansea contractors, the practical effect is that pre-construction information, design coordination, competence checks and site supervision belong in the bid process as well as delivery. The Civil Engineering Contractors Association represents contractors that build and maintain infrastructure networks, a structure that leaves many local firms working through asset-owner frameworks or subcontracted packages.
Procurement appears likely to keep favouring contractors that can document governance as clearly as delivery capacity. Smaller Swansea-area firms may continue to win specialist packages, but framework participation tends to reward audited processes, trained supervisors and stable subcontractor control. The relative scarcity of mid-market operators also points to partnership and acquisition activity around firms with recurring utility, highways or maintenance work. Margin pressure is likely to remain a constraint, especially where fixed-price commitments meet labour availability, materials volatility and tighter scrutiny of site risk.
295
Active firms
2026
9
Above £5M
reported revenue
68
Since 2022
new incorporations
Key facts
About 3% of the trading cohort reports turnover above £5M (9 of 295 firms) — the rest sits below that revenue band.
23% of the cohort was incorporated since 2022 (68 firms), so a sizeable share is in its first few filing cycles.
The Health and Safety Executive places civil engineering work within the Construction (Design and Management) Regulations 2015, with duties split across clients, designers, principal contractors, contractors and workers.
The Civil Engineering Contractors Association represents contractors that build and maintain UK infrastructure networks in transport, energy, water, waste and communications.
ONS construction statistics for Great Britain show construction new work increased by 1.4% in 2024.
New orders rose by 5.6% in 2024, with private infrastructure increasing by 15.4%.
ONS counted 370,770 VAT and PAYE-registered construction firms in Quarter 3 2024, up 1.7% on 2023.
Top Swansea Civil Engineering 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
DK NETWORK ENGINEERING LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy
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
DRAKELOW BATTERY LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable
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
BEACONS ELECTRICAL ENGINEERING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
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
JCR RAIL LIMITED
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · 0% CAGR over 2y
Location
AD Technique Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
G. M. Williams Plant Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -10% CAGR over 4y
Location
MGS Engineering (South Wales) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
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
BISP CIVIL ENGINEERING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 94% CAGR over 2y
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
AKRIVIA ENGINEERING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Samatrix Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs pumping systems and sewage treatment plants for residential and commercial properties. Provides hydraulic analysis, system specification, pump servicing, maintenance, and…
Serves residential and commercial property owners, facilities managers and developers needing pump systems or sewage treatment support, including maintenance and emergency call-outs.
Financial Health
WeakWeak · -12% CAGR over 4y
Location
KALITE HOLDINGS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Growing · 0% CAGR over 4y
Location
Miramar Developments Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak
Location
SWANSEA DESIGN & BUILD CONSTRUCTION LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
BEA JONES LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 5y
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
Menter Afon Limited
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
BJ HOLDINGS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% 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
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
ALLPIPES CIVILS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy · -89% CAGR over 2y
Location
Ken McInnes Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · Hiring · 19% CAGR over 4y
Location
Abbey Utilities Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 5y
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
Seaview Builders Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
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
JEFF JAMES (WALES) LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
JOHN DAVIES AGRICULTURAL AND PLANT CONTRACTOR LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed · -29% CAGR over 2y
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 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
JULIAN MOUSLEY & SONS LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides heavy haulage, plant hire, agricultural contracting and civil engineering services. Offers sports field and land drainage, demolition and site clearance, crushing and screening equipment…
Serves farmers, sports field operators, construction firms and public sector bodies needing land drainage, plant hire, haulage, civil engineering and recycling services, with agricultural work…
Financial Health
HealthyHealthy · Hiring · 10% CAGR over 3y
Location
Gwendraeth Valley Tarmacadam Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides asphalt and tarmacadam surfacing and resurfacing services for commercial and domestic projects, including car parks, public roads and private driveways. Also undertakes resin surfacing work…
Serves domestic homeowners, commercial organisations and local authorities in Carmarthenshire, including buyers responsible for driveways, car parks and public roadways.
Financial Health
StrongStrong · Growing · 0% CAGR over 2y
Location
Astoria Project Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
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
AMC & SONS LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 19% CAGR over 4y
Location
N MORGANS & SON LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
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
Unlock all 295 leads
Showing 50 of 295 — +245 more with verified decision-maker contacts, live data, and CRM sync.
How Swansea Civil Engineering companies work and how to sell to them
What they do
Swansea-area civil engineering contractors earn revenue from delivered works rather than licences or subscriptions. Typical income comes through measured work, schedule-of-rates tasks, framework call-offs, dayworks, plant and labour charges, subcontract packages and variation claims. The service is a mix of physical delivery and site management: excavation, drainage, surfacing, reinstatement, utilities civils, temporary works coordination and handover documentation. Margin is usually made in estimating accuracy, programme control, plant utilisation and claims discipline. A smaller number of firms have the governance and balance sheet to act as principal contractor; most are more likely to take defined packages under a larger programme.
Who they sell to
Most sell to public-sector infrastructure teams, utility asset owners, housing and commercial developers, and larger contractors that need local delivery capacity. The buyer is usually a procurement manager, framework manager, commercial manager, project manager, highways officer, utilities manager or quantity surveyor, with health-and-safety and site teams influencing approval. Small reactive jobs can be awarded through call-off arrangements or preferred-supplier lists, while larger packages tend to move through pre-qualification, tender, clarification and contract negotiation. Relationships matter, but formal evidence still carries weight: insurances, accreditations, supervisor competence, method statements, risk assessments, past performance and capacity to mobilise near Swansea.
What they buy
Most civil engineering firms tend to spend on tools and services that reduce site risk, protect margin and support tender evidence. Common software needs include estimating, take-off, project accounting, job costing, document control, site diaries, fleet tracking, plant management, health-and-safety reporting, training records, payroll, HR, CRM and subcontractor management. They also buy insurance, legal support, accountancy, quantity surveying, environmental advice, traffic management, materials testing, recruitment, training, fuel, plant hire, PPE, survey equipment and waste services. Sellers should expect practical scrutiny: anything aimed at this market needs to fit site workflows, patchy mobile coverage, subcontractor-heavy delivery and the audit trail required after an incident or dispute.
Why and how to sell to them
Civil engineering buyers tend to evaluate suppliers when workload becomes harder to control: a new framework win, more call-off work, supervisor hiring, a near-miss, an audit finding, rising plant costs, delayed valuations or a move from subcontractor packages into principal-contractor duties. The better outbound angle is usually operational rather than aspirational. Show how the offer shortens tender admin, improves evidence for competence checks, reduces rework, tightens job-cost visibility, speeds site reporting or helps recover variations. Generic construction messaging is less likely to land than a Swansea and South Wales frame that recognises utility works, highways access, weather disruption, subcontractor control and CDM documentation.
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
Related directories
Frequently asked questions
How many civil engineering companies are there in Swansea?
What counts as a civil engineering company in this list?
Which are the largest civil engineering companies in Swansea?
What do civil engineering companies in Swansea actually do?
How does Swansea civil engineering compare internationally?
How is this list built and how fresh is the data?
How big are the typical civil engineering companies in Swansea?
Are these mostly new or established civil engineering companies?
What SIC codes does this use?
What buying signals should I look for?
Push these 295 companies into your pipeline.
Find the right decision-makers, see verified company data, and export your list in seconds.