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Plumbing And Heating Companies in Southampton: 335 Active Firms (2026)
Plumbing and heating companies install, maintain and repair pipework, boilers and heating systems across the Southampton area.
Buying demand clusters around property maintenance, construction projects and facilities-management call-outs, rather than a unified purchasing centre. Domestic work is usually owner or landlord led, while commercial demand runs through facilities managers, developers, public-sector estates teams and local businesses. Engagements range from reactive call-outs and scheduled servicing to planned refits, plant-room upgrades and recurring maintenance packages across Hampshire and nearby South Coast markets. The more relevant operators for business screening tend to combine trade accreditation, mobile workforce scheduling, supplier relationships and enough administrative capacity to handle compliance paperwork, quotations and repeat account work.
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Southampton has 335 actively trading plumbing and heating firms, a local contractor base rather than a concentrated national market. Reported employment totals 741 people, pointing to a sector where many operators remain owner-managed or small field teams, with a thinner layer of regional contractors carrying more staff. Only 6 report turnover above £5M, so the revenue distribution is skewed towards smaller service and installation businesses. A younger layer is present too: 70 were incorporated since 2022, suggesting continued new-company formation alongside established local maintenance and building-services operators.
Safety and competence requirements shape how buyers select suppliers, even where the work is procured through ordinary building-maintenance budgets. Domestic customers tend to look for evidence that boiler and heating work can be carried out safely; commercial landlords and estates teams usually add insurance, method statements, service histories and response-time expectations. Market structure is still fragmented, because reactive maintenance rewards local coverage and trusted subcontractor networks. Developers and facilities managers, by contrast, tend to favour contractors that can document workmanship, coordinate with other trades and keep records suitable for handover and audit.
Demand appears relatively resilient where contractors sit close to recurring maintenance, emergency response and landlord compliance work. Margin pressure tends to come from labour availability, parts costs and the need to keep vans, scheduling systems and certification processes moving without much back-office capacity. The sector has been fragmented for a long time, so consolidation is more likely to appear through local acquisitions, subcontractor panels and facilities-management supply chains than through national platforms. Heat-system upgrades may also alter the mix of skills buyers look for, but traditional repair and servicing work should remain central to the cohort.
335
Active firms
2026
6
Above £5M
Companies reporting revenue over £5M
70
Newer firms
Incorporated since 2022
Key facts
About 1% of the trading cohort reports turnover above £5M (6 of 335 firms) — the rest sits below that revenue band.
20% of the cohort was incorporated since 2022 (70 firms), so a sizeable share is in its first few filing cycles.
Work spans pipework, boilers and heating systems across installation, maintenance and repair, rather than a single product line.
Buyers tend to split between household and landlord call-outs, facilities-management work, and construction-contractor packages.
The practical market split is between local response firms and contractors able to cover planned maintenance, commercial heating work or framework-style accounts.
Regulated building-services requirements sit close to day-to-day property maintenance, so compliance and availability both matter in procurement.
Top Southampton Plumbing And Heating companies
G.E. HARDING AND SONS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic plumbing and heating services including boiler installation, repair and servicing, central heating installation, gas safety inspections, landlord certificates, leak and burst pipe…
Serves domestic homeowners, landlords and business customers in Southampton and surrounding areas who need heating, gas and plumbing support, including boiler servicing and safety certificates.
Financial Health
WeakWeak · Hiring · 5% CAGR over 4y
Location
Gasworks Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing and repair of boilers and central heating systems; installs fireplaces and fires (gas, electric and solid fuel); supplies radiators, controls, cylinders and water…
Serves homeowners, landlords and commercial customers in Southampton and surrounding Hampshire areas needing heating, boiler, plumbing and fireplace support.
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
MERDON LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and electrical contracting services including boiler installation, servicing and repairs, central heating systems, bathroom installations, underfloor heating, drainage, electrical…
Serves residential and small commercial customers in Hampshire, including homeowners, landlords and property managers needing plumbing, heating, gas and electrical contractor support.
Financial Health
DistressedDistressed · -70% CAGR over 4y
Location
Heatcomp Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides commercial gas engineering, heating, HVAC, air conditioning and plumbing services, including installation, maintenance, compliance checks and emergency repairs. Works with businesses,…
Serves business owners, commercial landlords, and facilities or asset managers responsible for commercial properties across the South Coast, including Hampshire, Dorset and West Sussex.
Financial Health
StableStable · Hiring · 22% CAGR over 4y
Location
CROWN HEATING & PLUMBING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic and commercial plumbing and heating services including boiler installation, servicing and repairs, central heating system installation, landlord gas safety certificates, LPG work,…
Sells to homeowners, landlords and commercial property customers needing heating, plumbing and bathroom work. Serves domestic clients as well as businesses requiring boiler installation, servicing,…
Financial Health
StableStable · Hiring · 6% CAGR over 4y
Location
HEATWORKS HEATING LTD
Trajectory
3y · 2024–NowFinancial sub-scores
Computed from 3 filingsProvides installation, servicing and repair of gas and LPG boilers and central heating systems. Also offers powerflushing, air source heat pump installation, and boiler care plans and finance for…
Serves homeowners and residential customers in Southampton, Portsmouth and surrounding areas needing boiler, central heating and heat pump services.
Financial Health
StableStable · 0% CAGR over 2y
Location
HOME & INDUSTRIAL HEATING SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of heating, ventilation and air conditioning (HVAC) systems for commercial buildings, including boilers, commercial gas equipment, plant rooms, hot and…
Serves businesses, main contractors and public-sector property operators, including offices, care homes, delivery facilities and commercial buildings needing heating, cooling, ventilation and…
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
GA UK GROUP LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical, mechanical, plumbing and heating contracting services including system design, installation and maintenance. Also installs fire and security systems, generators, pumps and…
Serves a mix of businesses and homeowners, including industrial sites, commercial property operators, airports, residential customers, commercial catering businesses, and clients with domestic or…
Financial Health
StrongStrong · Growing, Hiring · 11% CAGR over 4y
Location
Gaswarm Heating And Mechanical Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
HM2 Property Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property maintenance, renovation and building services for residential properties, including extensions, kitchen and bathroom installations, plumbing, electrical work, heating and gas…
Serves residential homeowners across the South Coast needing property maintenance, renovations, extensions, kitchens, bathrooms, plumbing, electrics, heating and gas work.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
Austin Heating Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies, installs and services commercial and industrial heating, air conditioning and ventilation systems. Provides oil and gas heating solutions, air handling systems, and ongoing…
Serves commercial and industrial organisations needing heating, air conditioning, ventilation and commercial catering support, including contract customers locally and nationally.
Financial Health
DistressedDistressed · 0% CAGR over 4y
Location
SOUTHERN GREEN ENERGY GROUP LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
HealthyHealthy · Profitable · 0% CAGR over 1y
Location
Safety Gas Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · -15% CAGR over 4y
Location
GLC PLUMBING & HEATING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Ignite Service Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · Hiring · 21% CAGR over 4y
Location
N BROWN PLUMBING & HEATING LTD.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
A1 Complete Plumbing & Heating Ltd.
Trajectory
4y · 2023–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed · -21% CAGR over 3y
Location
ZEBRA GAS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
RJG Specialist Installations Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable
Location
WELLAND VALLEY GAS SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy
Location
GHP SOUTH LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -69% CAGR over 4y
Location
UNITED GAS HEATING AND PLUMBING LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Growing, Hiring · 44% CAGR over 3y
Location
Becketts Plumbing and Heating Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable · 0% CAGR over 3y
Location
Horus Mechanical Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StrongStrong · Growing · 0% CAGR over 3y
Location
JP PLUMBING & HEATING CONSULTANTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Gassed Up Heating Ltd
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
R J K Plumbers Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong
Location
MICHAEL TODD PLUMBING & HEATING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -62% CAGR over 4y
Location
VOYTEK PLUMBING AND HEATING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
L Baker Gas Solutions Limited
Trajectory
4y · 2019–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
DistressedDistressed
Location
CASTLEWAY LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
Manser Group Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
Bano Washroom Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable
Location
A.JUPES PLUMBING & HEATING SERVICES LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating services for residential and commercial properties, including leak repairs, plumbing installations, bathroom and kitchen fitting, boiler installation and servicing,…
Serves homeowners, landlords and small businesses in Southampton, the New Forest and nearby Hampshire towns, including customers needing domestic or commercial plumbing, heating and gas safety…
Financial Health
WeakWeak · -4% CAGR over 4y
Location
ALFORD PLUMBING & HEATING LTD,
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides plumbing and heating services including boiler installation, servicing and repairs, radiator and bathroom installation, landlord gas safety checks, power flushing, heating controls,…
Serves domestic homeowners, landlords and commercial property owners or managers in Southampton, Hampshire and surrounding areas.
Financial Health
StableStable · -75% CAGR over 3y
Location
RFW Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides heating and electrical engineering services for domestic and commercial customers, including boiler installation, servicing and repairs, electrical installations, pipework and refurbishment…
Serves homeowners and landlords within 30 miles of Southampton and commercial organisations nationwide, including hospitality and retail chains such as restaurants, coffee shops, fast-food brands and…
Financial Health
HealthyHealthy · Growing, Hiring · 3% CAGR over 4y
Location
HYDRO HEAT SOUTH LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides installation, repair and servicing of domestic gas and oil boilers, central heating systems, and heating appliances including Aga and Rayburn cookers. Also offers plumbing services, landlord…
Serves homeowners and residential landlords in the New Forest, Lyndhurst and Southampton areas with domestic oil and gas heating appliances, boilers, cookers, Agas and landlord safety requirements.
Financial Health
StrongStrong · Hiring · 22% CAGR over 2y
Location
Roost Services Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsInstalls, services and repairs domestic gas boilers and heating systems. Provides boiler finance, maintenance plans and smart heating controls, and installs underfloor heating, heat pumps and air…
Serves homeowners and small commercial property customers in Winchester, Eastleigh, Southampton and surrounding Hampshire areas needing heating, boiler and related home comfort services.
Financial Health
HealthyHealthy · Hiring · 2% CAGR over 5y
Location
LSB ELECTRICAL LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides electrical, plumbing and heating installation, maintenance and servicing for domestic and commercial properties. Services include rewiring, fuse box upgrades, lighting, CCTV and alarms,…
Serves domestic clients, landlords, main contractors, developers, management agents, and commercial, agricultural and retail businesses in Hampshire and Dorset.
Financial Health
StableStable · Hiring · 22% CAGR over 3y
Location
SOLUTIONS WATER AND AIR MANAGEMENT LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides commercial heating and plumbing engineering services and water treatment, including installation, maintenance and servicing of heating systems and management of hot and cold water systems…
Serves commercial customers such as businesses, property managers and facilities teams across Hampshire, Dorset and the South Coast needing building services support.
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
RAK Technical Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building maintenance and technical building services, including design, installation and servicing of air conditioning, refrigeration, ventilation, heating, plumbing and electrical systems,…
Serves homeowners, offices, factories and other domestic, commercial and industrial premises in Hampshire needing building maintenance, electrical, HVAC, refrigeration and renewable energy services.
Financial Health
StrongStrong · Growing, Hiring · 22% CAGR over 2y
Location
Smh Plumbing And Heating Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides plumbing and heating services including boiler installation and servicing, bathroom fitting, air source heat pump installation, landlord gas safety checks, and commercial plumbing and…
Serves domestic customers, landlords and commercial clients in Southampton and across the South, including homeowners and property owners needing plumbing, heating and gas safety support.
Financial Health
StrongStrong · Hiring · 6% CAGR over 3y
Location
Economy Heating Services Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides commercial heating and plumbing services including boiler room installation, boiler servicing, gas system repairs, and fabrication work. Gas Safe registered engineers manage and maintain…
Serves businesses, landlords and facilities or property managers responsible for commercial properties across the South Coast and Midlands, especially sites with boiler rooms and commercial heating…
Financial Health
HealthyHealthy · Growing · 0% CAGR over 2y
Location
CRS PLUMBING AND HEATING SPECIALISTS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic plumbing and heating services including emergency repairs, boiler and central heating installation and servicing, bathroom plumbing, water mains repairs, water softeners, underfloor…
Serves homeowners, landlords and property developers across Hampshire and the South Coast, including households and new-build housing developments needing plumbing and heating contractors.
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
Location
H2O Plumbing & Heating 1984 Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating services including boiler installation, servicing and repair, central heating systems, underfloor heating, bathroom installation, and solar and renewable heating…
Serves homeowners, landlords and small commercial customers needing plumbing, heating, bathroom and renewable installation or repair services in Eastleigh, Hampshire and nearby areas.
Financial Health
StableStable · -5% CAGR over 4y
Location
CEI ELECTRICAL SERVICES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides electrical, mechanical, and plumbing services including industrial, commercial, residential and marine electrical installations, heating and ventilation systems, gas and plumbing work,…
Serves local government bodies, schools, sports and civic facilities, private developers, defence organisations, builders, contractors, industrial and commercial businesses, plus domestic homeowners…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 2y
Location
L W Gas Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing, and repair of gas, oil, and LPG boilers and heating systems. Offers central heating upgrades, radiator and smart control installation, boiler care plans, air…
Serves B2C homeowners and residential landlords in Southampton, Portsmouth and Hampshire needing boiler, central heating and gas safety support for gas, oil and LPG systems.
Financial Health
HealthyHealthy · Hiring · 2% CAGR over 4y
Location
Our MEP Co. Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical, electrical and public health (MEP) building services including system design, installation and maintenance. Also offers design-stage consultancy, facilities management, and…
Serves property developers, contractors, building owners and facilities teams in Hampshire across commercial, hospitality, education, culture, assisted living, ports and high-end residential projects.
Financial Health
StrongStrong
Location
S&T Heating Services Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides plumbing, heating and renewable energy system installation for residential developments and homes. Services include boiler systems, air source heat pumps, underfloor heating, full plumbing…
Serves national housebuilders, property developers and homeowners across the South, focused on new-build residential developments, large-scale housing projects, high-rise apartments and domestic…
Financial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
R Wilson Services
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic plumbing and heating services, including boiler installation and servicing, heating system powerflushing, gas appliance servicing, pipe and radiator repairs, landlord gas safety…
Serves homeowners and residential landlords in Southampton, Fareham, Gosport and surrounding areas, primarily domestic customers needing plumbing, heating, boiler and bathroom trades.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
Location
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How Southampton Plumbing And Heating companies work and how to sell to them
What they do
Plumbing and heating contractors earn revenue from a mix of labour, parts mark-up, call-out charges, fixed-price installation work and planned maintenance agreements. Domestic jobs are often quoted per visit or per installation, while commercial work tends to be priced through schedules of rates, service contracts or project quotations with staged payments. The service shape is operational rather than purely advisory: vans, engineers, parts availability, certification and job records all sit inside the offer. Smaller operators usually trade on response time and local reputation; larger local contractors are more likely to carry account work, planned servicing, subcontract packages and coordination with other building trades.
Who they sell to
Most firms sell to a split buyer base. Domestic work reaches homeowners, landlords and letting agents, where decisions can be quick and reputation-led. Commercial work is more formal, with facilities managers, property managers, site managers, estates teams, developers and finance contacts involved in approval. Smaller jobs may be booked by phone or web enquiry, while larger maintenance and project work tends to move through quotations, subcontractor panels, framework-style supplier lists or tender processes. Sales cycles vary accordingly: emergency and repair work can convert quickly, but planned servicing, refits and public-sector estates work usually needs evidence of insurance, accreditations, availability and prior delivery.
What they buy
Most plumbing and heating firms tend to spend on tools that reduce wasted engineer time and improve job control. Useful categories include field-service scheduling, route planning, job costing, quotation and invoicing software, customer relationship management, payment collection, stock control and document management for certificates, service histories and method statements. They also buy accounting, payroll, HR, recruitment, insurance, fleet services, fuel cards, training, health-and-safety support, trade marketing and local search services. Contractors with more commercial work may need procurement portals, tender-writing support, asset-management workflows and reporting that can satisfy landlords, developers and estates teams without adding too much office administration.
Why and how to sell to them
Plumbing and heating buyers tend to evaluate suppliers when work volume outgrows informal scheduling, when engineers are being added, when a new maintenance contract brings reporting obligations, or when parts costs and late payments start to expose weak job costing. A useful outbound angle is usually operational rather than aspirational: fewer missed appointments, faster quotations, cleaner compliance records, better van utilisation or clearer margins by job type. Signals worth watching include new premises, new vans, recruitment for engineers or office coordinators, tender activity, a move into commercial servicing, or visible investment in accreditations and documented safety processes.
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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