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M&E Contractors Companies in Portsmouth: 42 Active Firms (2026)
M&E contractors design, install and maintain mechanical and electrical building services for commercial and public-sector sites around Portsmouth.
Buying centres tend to sit with estates, facilities, capital-projects and procurement teams, rather than a single trade buyer. Demand around Portsmouth is usually B2B or public-sector, with commercial property owners, infrastructure operators and multi-site facilities managers looking for contractors that can price, programme and coordinate work alongside architects, main contractors and site managers. Engagements are project-led, often mixing installation, commissioning and planned maintenance, so evidence of site supervision, specialist engineering capacity and repeat facilities work matters more than broad national coverage.
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Portsmouth has 42 actively trading M&E contractors in scope, a compact local cohort rather than a deep regional market. Reported employment totals 571 people, and every reporting firm discloses some headcount, so the employment footprint is visible across the cohort. Only 5 contractors sit above £5M in annual turnover, which leaves the market weighted towards owner-managed and lower mid-market operators, with larger project capacity concentrated in a small revenue-qualified group.
Market structure is shaped by compliance burden as much as installation capability. Electrical installation, heating, ventilation, fire-safety interfaces, site safety and public-sector procurement each create separate qualification, documentation and handover requirements. For Portsmouth buyers, that tends to make pre-qualification evidence, insurance cover, subcontractor control and maintenance response processes part of supplier selection, not just commercial extras. Contractors working across commercial and public-sector sites also need to coordinate with main contractors and facilities managers, which favours firms that can evidence repeatable site controls and keep close records across design, commissioning and aftercare.
Future movement appears likely to come from procurement discipline and labour availability rather than a surge of new entrants. The cohort looks mature, and buyers tend to reward contractors that can combine project delivery with planned maintenance, emergency response and clear handover evidence. Smaller firms may remain viable where relationships are local and response times are valued, but contract packaging by public-sector and facilities-management buyers can push work towards operators with broader supervision and compliance capacity. That points to gradual consolidation in delivery networks, not a clean break with the existing contractor base.
42
Active firms
2026
5
Above £5M revenue
Larger trading firms
3
Incorporated since 2022
Newer entrants
Key facts
About 11% of the trading cohort reports turnover above £5M (5 of 42 firms) — the rest sits below that revenue band.
7% of the cohort was incorporated since 2022 (3 firms), so a sizeable share is in its first few filing cycles.
M&E contractors around Portsmouth typically combine design, installation and maintenance work across mechanical and electrical building services.
Commercial and public-sector buyers often assess contractors on project fit, maintenance cover, insurance and health-and-safety documentation.
Work pipelines tend to follow construction, fit-out, refurbishment and estate-maintenance budgets rather than subscription-style purchasing cycles.
Maintenance contracts matter because installed systems still need testing, fault response and lifecycle replacement after handover.
Top Portsmouth M&E Contractors companies
INTERNATIONAL MECHANICAL SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services for building projects, including design, installation and commissioning of building services systems such as HVAC, electrical and public health…
Sells to businesses and public sector organisations in the South East and London, including leading main contractors and private clients in commercial offices, healthcare, education, leisure,…
Financial Health
StrongStrong
Location
Hampshire Plumbing & Heating Solutions Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating contracting services for residential, commercial and new-build projects. Offers mechanical and electrical design, installation and renovation, including underfloor…
Serves B2B property developers, contractors and facilities owners across private and social housing, offices, refurbishment, leisure, industrial, medical and retail premises, alongside domestic…
Financial Health
StrongStrong · Growing, Hiring · 20% CAGR over 4y
Location
ARB MECHANICAL ENGINEERING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies and installs mechanical building services for commercial and public sector projects. Services include heating, ventilation and air conditioning (HVAC), plumbing, gas and medical…
Serves construction contractors, specifying authorities, NHS hospitals, local councils, schools, colleges, hotels, sports facilities and industrial sites needing mechanical building services projects.
Financial Health
StableStable · -70% CAGR over 4y
Location
AD Mechanical
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs mechanical building services for commercial and industrial projects, including chilled water systems, ventilation, gas installations, plant rooms, boilers, chillers and HVAC…
Serves industrial and commercial clients across the South of England, including main contractors, care homes, hotels, education providers, defence sites, student accommodation, residential…
Financial Health
WeakWeak · -2% CAGR over 4y
Location
Southern Counties Heating & Plumbing Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides design and installation of plumbing, heating, gas and air source heat pump systems for new-build and renovation projects. Also installs air conditioning and ventilation and manages projects…
Sells mainly to property developers, building contractors and commercial clients needing plumbing, heating and gas installations for new-build and renovation projects. Also serves homeowners and…
Financial Health
DistressedDistressed · 0% CAGR over 5y
Location
A3 Air Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, manufactures and installs HVAC, air conditioning, ducted ventilation and kitchen extraction systems for commercial and residential buildings. Provides system design, site surveys,…
Serves B2B customers such as factories, commercial kitchens, housing providers and care/older people services, plus residential homeowners seeking air conditioning for individual properties and…
Financial Health
StableStable · -13% CAGR over 2y
Location
Javelin Controls Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides engineering consultancy and installation of building energy management systems (BEMS) and HVAC controls. Services include system design, control panel build, software graphics,…
Serves businesses, institutions and facilities teams with commercial or industrial buildings across Hampshire, West Sussex and the wider south, including clients managing heating, hot water, HVAC and…
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
We Are Primus Ltd
Trajectory
1y · 2025–NowProvides construction and engineering services including electrical and mechanical installations, renewable energy systems, civil works, building fit‑outs and fabric repairs. Also offers project…
Serves business and institutional buyers needing construction and engineering work, including project managers and energy or sustainability teams commissioning electrical, mechanical, renewables,…
Financial Health
Insufficient historyInsufficient history
Location
DELTA VENTILATION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs, commissions, and maintains smoke control and smoke ventilation systems for buildings. Provides AOV, mechanical smoke ventilation, and louvre systems, along with compliant…
Sells to B2B customers in the built environment, including contractors, construction teams, facilities managers and building operators needing smoke control systems for high-risk, residential…
Financial Health
StableStable · Hiring · 16% CAGR over 4y
Location
IDC Electrical (Southern) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical contracting services including electrical installation, inspection and testing, control systems, CCTV and data cabling, fire alarms, plumbing, ventilation, air…
Serves commercial and public-sector clients on the South Coast, including education providers, building owners and project stakeholders requiring mechanical and electrical contractors for property…
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
Location
Inovolt Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical installation and maintenance services for industrial and commercial facilities. Services include HVAC systems, electrical testing and distribution, fire and…
Serves B2B and public-sector facilities teams at industrial, commercial and educational sites, including defence, healthcare, hospitality and manufacturing organisations.
Financial Health
HealthyHealthy · 1% CAGR over 4y
Location
PARCAR LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical engineering services including electrical installations, lighting, mains distribution, testing and inspection, air conditioning, ventilation, plumbing and heating…
Serves organisations needing electrical and mechanical engineering support, including public sector and defence-related clients. Targets commercial sites requiring building services, maintenance and…
Financial Health
StableStable · -7% CAGR over 5y
Location
Building & Engineering Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building services engineering for construction projects, including design and installation of mechanical and electrical (M&E) systems, electrical works, controls, life safety, ICT, and…
Serves B2B and public-sector construction and property clients, including main contractors, developers, local authorities and institutions in commercial, leisure, healthcare, retail, technology,…
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
AES Environmental Systems Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides heating, ventilation and air conditioning (HVAC) and mechanical building services, including installation and servicing of air conditioning, ventilation, heating systems, commercial…
Serves B2B organisations across the South Coast in commercial, industrial, education, healthcare, defence, scientific and food sectors, targeting facilities and estates teams responsible for…
Financial Health
StableStable · Hiring · 5% CAGR over 4y
Location
PJM MECHANICAL & ELECTRICAL LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides mechanical, electrical and commercial plumbing engineering services for construction projects. Offers design and build, installation and project management for building services across…
Serves construction industry clients across education, commercial, residential, leisure, healthcare and ecclesiastical property sectors, including organisations requiring mechanical and electrical…
Financial Health
StableStable · -6% CAGR over 3y
Location
Beatties Mechanical Contractors Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical and mechanical contracting services including design, supply, installation and commissioning of building services systems. Also undertakes main contracting work and refurbishment…
Serves business clients commissioning electrical, mechanical, renewable and main contracting projects, including companies managing building works across the south of the UK.
Financial Health
StrongStrong · Growing, Hiring · 19% CAGR over 4y
Location
RJC (Mechanical) Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical building services for commercial and industrial sectors, including design, installation and maintenance of air conditioning, heating, ventilation, refrigeration,…
Serves commercial, industrial and public sector organisations nationwide, including defence, hospitality, retail, healthcare, government and education clients needing building services support.
Financial Health
StrongStrong · Growing, Hiring · 10% CAGR over 2y
Location
WM BUILDING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical contracting services for design-and-build construction projects, including installation and maintenance of building systems. Works across industrial, commercial,…
Serves design-and-build construction clients across industrial, commercial, distribution, public sector, education, healthcare, leisure, hospitality, residential and corporate developments.
Financial Health
DistressedDistressed · 0% CAGR over 2y
Location
ASTER BUILDING SERVICES LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides installation, maintenance and repair of heating, ventilation and air conditioning (HVAC) systems for commercial buildings. Services include air conditioning, refrigeration, ventilation,…
Serves commercial property owners, facilities managers and organisations needing HVAC, refrigeration and M&E support, mainly across Surrey, Berkshire, Hampshire, West London and South London.
Financial Health
StableStable · Hiring · 15% CAGR over 2y
Location
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building refurbishment, fit-out and maintenance services for commercial, hospitality, healthcare and public sector properties. Delivers fabric construction works, mechanical and electrical…
Serves B2B and public sector clients, including commercial property owners, hospitality operators, healthcare organisations and public premises managers with building refurbishment, fit-out and…
Financial Health
WeakWeak
Location
Compass Electrical Projects Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical contracting services for commercial and retail projects, including electrical and mechanical installations, fire alarm systems, data cabling, security and access…
Sells to businesses and project professionals needing M&E services, especially in commercial and retail environments. Serves sectors including retail, restaurants, leisure and commercial property…
Financial Health
StrongStrong · Growing · 2% CAGR over 4y
Location
JRC Facilities Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical and electrical installation, building services, maintenance and repair, decoration, and scaffolding for construction and infrastructure projects, including electrical…
Serves business and public-sector clients needing facilities, construction and maintenance support, especially in defence, construction, civil engineering and M&E. Targets organisations with…
Financial Health
StrongStrong · Growing, Hiring · 15% CAGR over 2y
Location
Mkg Building Services Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides mechanical, electrical and HVAC engineering services including design, installation, repair and maintenance of air conditioning, heating, gas, plumbing, ducting and ventilation systems for…
Serves B2B commercial and industrial clients across the South of England, including facilities with catering or kitchen ventilation needs, alongside selected domestic and residential customers…
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 2y
Location
2 TECK LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical building services including installation and maintenance of lighting, power distribution, air conditioning, ventilation, plumbing and heating systems. Also installs…
Serves businesses, commercial property operators, facilities managers and construction project teams in southern UK requiring building services installation, fit-out and ongoing maintenance support.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
Location
Limburn Boiler & Heating Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical engineering services including installation, refurbishment and maintenance of commercial and industrial boiler, heating and piped systems. Also carries out HVAC and air…
Serves commercial and industrial customers needing boiler, heating and piped-system support, including facilities managing plant and mechanical systems. Also works with insurance companies on…
Financial Health
StableStable · 2% CAGR over 4y
Location
Premelec Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsProvides design and installation of mechanical and electrical building services, including electrical systems, data and communications cabling, plumbing and heating, air conditioning, and renewable…
Serves B2B clients in the built environment, including construction teams, contractors, developers and commercial property owners needing M&E support for refurbishment and infrastructure projects.
Financial Health
DistressedDistressed · 0% CAGR over 1y
Location
Internal Solutions (Southern) Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsDesigns and installs HVAC systems for critical environments requiring precise temperature and humidity control. Provides chilled water systems, air conditioning, and mechanical ventilation, along…
Serves UK businesses operating critical environments, including data centres, laboratories, IT suites, offices, UPS and battery rooms, manufacturing facilities, and telecoms/IT modules requiring…
Financial Health
HealthyHealthy · Hiring · 68% CAGR over 5y
Location
Rossair Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical engineering services, including installation and maintenance of heating, ventilation, air conditioning, chilled water, and ventilation systems. Also undertakes…
Serves UK businesses and organisations with commercial, retail and industrial sites, including facilities managers, contractors, large client teams and grid-scale energy storage project developers.
Financial Health
StableStable · -13% CAGR over 4y
Location
Wing's Technical Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides facilities management and building services including electrical and mechanical maintenance, fire and security system installation and monitoring, and building construction, refurbishment,…
Serves B2B and public-sector facilities across the South of England, including schools, care homes, MOD buildings, factories, construction clients, and commercial, industrial and educational…
Financial Health
HealthyHealthy · Hiring · 3% CAGR over 4y
Location
Prima Air Conditioning And Refrigeration Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsDesigns, installs, and maintains air conditioning, refrigeration, and ventilation systems for commercial and residential properties. Provides system design, equipment supply, repairs, and servicing,…
Serves commercial and corporate organisations across the UK, particularly in London and southern England, alongside residential customers requiring air conditioning, refrigeration, ventilation and…
Financial Health
DistressedDistressed · -5% CAGR over 2y
Location
APPLIED POWER SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical engineering services for commercial and industrial power systems, including power system design, high‑ and low‑voltage switchgear and transformer installation, cable installation…
Serves UK commercial and industrial organisations with high- and low-voltage power infrastructure needs, including large industrial operators, manufacturing sites, utilities-style facilities and…
Financial Health
StrongStrong · Hiring · 10% CAGR over 2y
Location
RSE Electrical & Maintenance Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides electrical contracting services including design, verification, installation and maintenance of electrical systems. Works on commercial and industrial projects across sectors such as…
Serves commercial and industrial clients, including organisations in education, rail, healthcare, retail, property, engineering and manufacturing across southern England and London.
Financial Health
HealthyHealthy · 0% CAGR over 4y
Location
S J Power Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical installation services focused on emergency backup power systems. Supplies, installs and maintains generators and uninterruptible power supply (UPS) systems, and delivers…
Serves B2B customers with critical power requirements, particularly data centres and commercial or industrial sites, and also supports homeowners needing generator capacity or fibre connectivity.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
SES Controls Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, manufactures and installs building management and HVAC control systems. Provides system integration, energy metering and monitoring, control panels, PC supervisory interfaces, commissioning,…
Serves commercial and institutional building owners, facilities managers and M&E contractors needing BMS, HVAC control and energy monitoring support from tender through aftercare.
Financial Health
StableStable · -1% CAGR over 4y
Location
Indigo Fire Systems (Marine) Limited
Trajectory
3y · 2022–NowDesigns and installs fire sprinkler systems for commercial, residential, and domestic buildings. Provides dry riser installations, system design, project management, and ongoing servicing and…
Serves B2B construction and facilities clients, mainly in London and Southern England, including property developers, main contractors, M&E engineers, commercial/industrial sites, care homes, HMOs,…
Financial Health
Insufficient historyInsufficient history
Location
M & B ELECTRICAL SERVICES (READING) LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical contracting services including installation, repair and testing of lighting and power systems for commercial, educational and industrial buildings. Also conducts energy surveys…
Serves businesses and organisations in the South, including schools and education sites, commercial premises, offices and industrial facilities needing electrical contractors for small repairs…
Financial Health
HealthyHealthy · Hiring · 12% CAGR over 3y
Location
CURA ELECTRICAL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical design, installation, maintenance and testing services for residential and commercial properties. Conducts electrical surveys, EICR inspections, wiring installations including…
Serves commercial property operators, transport hubs such as ferry ports, train stations and airports, residential developers and residential customers, with emphasis on clients in the South of…
Financial Health
StableStable · 33% CAGR over 1y
Location
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How Portsmouth M&E Contractors companies work and how to sell to them
What they do
Portsmouth M&E contractors earn revenue from designing, installing, commissioning and maintaining building-services systems, usually as priced projects rather than recurring software-like subscriptions. Income typically combines labour charge-out, material supply and mark-up, subcontracted specialist work, preliminaries, testing, commissioning and aftercare. Project pricing is commonly tendered as a fixed-price package with variations managed through site instructions; smaller reactive jobs may run on day rates, call-out fees or schedules of rates. Planned maintenance contracts add recurring revenue, but much of the margin still depends on utilisation, site productivity, material availability and getting handover evidence accepted without rework.
Who they sell to
Most sell to commercial landlords, local public-sector estates teams, facilities managers, infrastructure operators, main contractors and building-services consultants. The practical buyer may be an estates manager, project manager, quantity surveyor, head of procurement, facilities director or site manager, with finance involved when payment terms, retentions and credit limits matter. Small works can be won through existing relationships and direct quotation, while larger packages tend to move through tender lists, frameworks or consultant-led procurement. Sales cycles vary: emergency works can be approved quickly, planned maintenance can take weeks, and capital-project packages usually follow design, budget and programme gates before award.
What they buy
Most M&E firms tend to spend on tools that make pricing, scheduling, compliance evidence and cash collection less manual. Relevant categories include estimating and take-off software, project costing, field-service scheduling, mobile job sheets, document control, health-and-safety management, asset registers, planned-maintenance workflows and subcontractor management. Back-office needs usually cover accounting, payroll, credit control, CRM, bid management, HR, training records, insurance advice, legal support and fleet administration. They also buy recruitment, temporary labour, specialist testing equipment, PPE, calibration, materials procurement support and marketing help where framework submissions or local search visibility feed the work pipeline.
Why and how to sell to them
M&E buyers tend to evaluate suppliers when workload exposes coordination problems: a new framework place, a facilities-management contract, a move into larger project packages, a new finance lead tightening margin control, or a rise in engineer headcount that makes spreadsheet scheduling brittle. Outbound works better when it recognises the contractor's margin mechanics rather than offering generic efficiency claims. Useful angles include fewer return visits, faster handover packs, clearer variation capture, better subcontractor visibility, quicker invoice approval and evidence that helps pass pre-qualification. Timing also matters; renewal dates, audit pressure and a visible run of site vacancies can all signal budget.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
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Frequently asked questions
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