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Plumbing Companies in Cardiff: 342 Active Firms (2026)
Plumbing companies in Cardiff install, repair and maintain water, gas and heating systems for homes, landlords and commercial premises.
Buying centres tend to sit with householders, landlords, letting agents, facilities managers and small construction buyers rather than a central procurement function. Work is field-led: emergency repairs, planned maintenance, boiler and heating work, bathroom and kitchen refits, and mechanical-services packages on local projects. Engagements range from ad hoc domestic call-outs to retained landlord or facilities arrangements, with project-led installation revenue layered on top. The typical operator is a small to mid-sized contractor with engineers, apprentices, schedulers and office staff, not a pure sole-trader directory or a national building-services group.
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Cardiff has 342 actively trading plumbing companies, giving the city a sizeable local contractor base for residential, landlord and commercial maintenance demand. Reported employment across the cohort stands at 816 people, which points to a market made up mostly of small field teams rather than labour-heavy regional contractors. Only 3 operators sit above £5M in turnover, so the revenue profile is concentrated below the larger mechanical-services tier. The 98 entrants incorporated since 2022 also show a visible recent-entry layer, likely shaped by domestic repair demand, subcontracting into building projects and landlord maintenance workflows.
Because activity includes water, gas and heating systems, buyer diligence tends to focus on certification, insurance, landlord documentation and site health-and-safety processes. Domestic customers usually buy on availability and trust, while facilities managers and commercial premises need scheduling discipline, service records and repeat attendance. Where contractors subcontract into local construction projects, payment timing and coordination with other trades matter as much as the installation itself. That mix keeps the market practical and compliance-led, with smaller contractors often competing against broader mechanical-services suppliers on responsiveness rather than geographic coverage.
Fragmentation appears likely to persist. Recent incorporations point to continuing contractor formation, but the thin higher-turnover tier suggests that few operators break out of owner-managed or small-team delivery. Buyers tend to value response time, certification discipline and the ability to coordinate with other trades more than a broad geographic footprint. For analysts, the interesting movement is not a sudden consolidation wave but the gradual separation between reactive domestic trades, landlord-maintenance specialists and mechanical-services contractors that can take project risk.
342
Active firms
2026
3
Above £5M
annual revenue
98
New since 2022
incorporations
Key facts
About 1% of the trading cohort reports turnover above £5M (3 of 342 firms) — the rest sits below that revenue band.
28% of the cohort was incorporated since 2022 (98 firms), so a sizeable share is in its first few filing cycles.
Cardiff plumbing and heating contractors serve domestic, landlord and commercial premises, with work split between installation, repair and planned maintenance.
Rental compliance appears to be a recurring demand driver, particularly where water, gas and heating systems need periodic inspection or remedial work.
The market tends to favour local contractors rather than national facilities groups, reflecting call-out work, repeat landlord relationships and area-based maintenance routes.
Operating models vary between labour-heavy maintenance teams and project-led contractors that rely more on subcontracted capacity.
Top Cardiff Plumbing companies
SOLVIT (WALES) LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides commercial, domestic and industrial gas, heating and plumbing services, including boiler and heating installations, maintenance and repairs, bathroom and washroom design and fitting, water…
Serves domestic, commercial and industrial customers across South Wales and the West, including local authorities, private sector companies, local businesses, universities, medical centres, care…
Financial Health
HealthyHealthy · Hiring · 8% CAGR over 5y
Location
SOUTH WALES PROPERTY SOLUTIONS LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides property maintenance and building services for domestic and commercial clients, including plumbing, electrical work, gas servicing, landscaping, property clearance, external cleaning,…
Serves domestic homeowners, landlords and commercial property owners/managers across the M4 Corridor and surrounding areas, from Pembrokeshire to Swindon.
Financial Health
StableStable
Location
N J Harkus Plumbing and Heating Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides plumbing and heating services including boiler installation, servicing and repair, bathroom fitting, central heating systems, gas fire work, landlord gas safety certificates, leak detection,…
Serves domestic customers, landlords and property managers needing plumbing, heating and gas services in Cardiff and surrounding areas, including emergency enquiries and general repair or…
Financial Health
HealthyHealthy · -7% CAGR over 4y
Location
Green Heat Wales Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsSupplies and installs renewable energy and heating systems including air and ground source heat pumps, solar PV and solar hot water, and biomass boilers, and provides plumbing, boiler and bathroom…
Serves B2C homeowners and property owners across Wales, particularly people seeking domestic renewable energy, plumbing and heating support through Cardiff and Brecon showrooms.
Financial Health
DistressedDistressed · -10% CAGR over 4y
Location
HEAT2COOL ENGINEERING LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing and repair of heating, ventilation and air conditioning systems for residential and commercial properties. Also supplies and installs boilers, refrigeration…
Serves a mixed B2C and B2B market: homeowners and commercial organisations seeking heating, ventilation, air conditioning, plumbing, refrigeration or renewables services, including installation,…
Financial Health
StableStable · Hiring · 36% CAGR over 5y
Location
CLOCKWORK CONSTRUCTION LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building, repair and property maintenance services for residential and commercial properties, including electrical work, plumbing and heating, roofing, decorating, windows and doors…
Serves homeowners, landlords, property managers and business premises owners, including offices, retail and commercial units, industrial sites, hospitality venues, schools, higher education…
Financial Health
WeakWeak · -24% CAGR over 4y
Location
K S Barry (Plumbing & Heating) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides plumbing, heating and mechanical installation services for commercial construction projects, including rainwater systems, sanitaryware installation, above-ground drainage, leadwork, and…
Serves businesses and main contractors involved in commercial construction projects, including clients developing or refurbishing offices, public buildings and other non-domestic sites.
Financial Health
StableStable · -3% CAGR over 2y
Location
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides commercial and industrial gas heating engineering services, including design and installation of radiant tube, warm air and cabinet heating systems, as well as HVAC applications,…
Serves commercial, industrial and small-business customers, including schools, colleges, care homes, nursing homes and doctors’ surgeries across South Wales and the West of England.
Financial Health
StableStable · 0% CAGR over 4y
Location
TS Heating & Bathrooms Ltd
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides plumbing and heating services including boiler installation, servicing and repairs, gas engineering and power flushing. Designs and installs bathrooms, wet rooms and kitchens, and carries…
Sells to homeowners and residential property customers needing plumbing, heating, boiler, gas, bathroom and kitchen installation services, mainly in Cardiff, Penarth, Barry, Newport and the wider…
Financial Health
StableStable · -11% CAGR over 2y
Location
Infinite Solutions (Cardiff) Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides building and property maintenance services, including planned and reactive repairs, roof and high‑access works, leak detection and water ingress investigation, gutter and fascia cleaning,…
Serves individual landlords and homeowners, plus commercial property owners, private housing associations, letting agents, property management companies and insurance brokers with residential or…
Financial Health
WeakWeak · 0% CAGR over 4y
Location
MDP Mechanical Services Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -5% CAGR over 4y
Location
KOSHER MUSIC LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
PLUMBQUIK LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
GAS SAFETY CERTIFICATE LONDON LTD
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
BPS Facilities Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides commercial property maintenance and engineering services, including plumbing, gas heating, boilers, air conditioning and ventilation, electrical installation and testing, roofing works, and…
Serves businesses, commercial property owners and industrial companies across Wales, South West England and the M4 Corridor, spanning varied sectors needing facilities and property support.
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 2y
Location
Allied Mechanical Engineering Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building services engineering, including design, installation and refurbishment of mechanical systems such as commercial heating, hot and cold water services, mechanical ventilation, air…
Serves public sector bodies, healthcare organisations and private commercial clients, including councils, hospitals, education campuses and organisations procuring through frameworks or…
Financial Health
HealthyHealthy · -6% CAGR over 2y
Location
AC Ventilation Solutions Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides design, installation and maintenance of heating, ventilation and air conditioning (HVAC) systems. Offers air conditioning, heating controls, ventilation systems, and repair and servicing for…
Serves businesses and organisations across the UK in commercial, industrial, healthcare, education, retail, hospitality, leisure, financial services and restaurants, plus high-end residential project…
Financial Health
StableStable · -5% CAGR over 4y
Location
BOILER RITE LTD
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
Location
Reliable Tradesman Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
DistressedDistressed
Location
Freeflow Ventilation Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
ANDERSON & LEONARD LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -68% CAGR over 4y
Location
AMC Electrical Heating and Plumbing Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
Decorative Heating Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
SMARTER GREENER LIMITED
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
LIMEGREEN ENGLAND & WALES LTD
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsInstalls and services domestic heating and energy systems, including gas boilers, air conditioning, fires and fireplaces. Also provides bathroom installations, solar PV systems, electrical services,…
Serves homeowners and domestic households in Wales, particularly people replacing boilers, upgrading home heating, renovating bathrooms, or considering residential green energy and electrical…
Financial Health
StableStable · -79% CAGR over 3y
Location
WDS Green Energy Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsDesigns, supplies and installs renewable heating systems for residential and commercial buildings, specialising in air source and ground source heat pumps, underfloor heating and radiator systems,…
Serves homeowners, self-builders, renovators and commercial property owners across Wales, the Midlands and the South West, particularly those with new-build, existing or renovation projects.
Financial Health
StableStable · Hiring · 8% CAGR over 4y
Location
R.S. GASCARE LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
PENYLAN HEATING LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -68% CAGR over 4y
Location
Atlantic Ventilation Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong
Location
Cosywarm Heating and Plumbing Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · -13% CAGR over 4y
Location
HEWETT HEATING & PLUMBING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
RM HEATING SOLUTIONS PENARTH LIMITED
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StrongStrong · Hiring · 81% CAGR over 1y
Location
NATIONWIDE RETROFIT LTD
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides home energy‑efficiency retrofitting services funded through ECO and related grant schemes, including installation of boilers, first‑time central heating systems, air source heat pumps, and…
Serves UK households, particularly low- and medium-income residents, benefit recipients, and vulnerable occupants eligible for ECO or local authority flex grant funding.
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
Location
QUARTZ PLUMBING AND HEATING LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Growing, Hiring · 41% CAGR over 2y
Location
GE Cooling Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
RB Plumb and Heat Limited
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Fulcom Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides building services commissioning for HVAC and water systems, including air and water balancing, domestic hot water commissioning, pre‑commission cleaning of heating and chilled water…
Serves construction contractors and building end users involved in HVAC and water-system projects, including organisations needing compliant commissioning documentation for building handover and…
Financial Health
WeakWeak · Hiring · 27% CAGR over 2y
Location
BOILERHUT LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
StrongStrong · Hiring · 29% CAGR over 2y
Location
BIOMAN SERVICES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides servicing, maintenance and repair for biomass boiler systems. Offers commissioning, remediation, spare parts supply and remote monitoring, along with plant room service contracts and…
Serves UK organisations and property owners operating biomass boiler systems, from small kW installations to MW-scale plant, including customers with ongoing failures, maintenance contracts or RHI…
Financial Health
HealthyHealthy · Hiring · 7% CAGR over 4y
Location
MJ LEWIS PLUMBING & HEATING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic and commercial plumbing and heating services, including bathroom installations, showers and wet rooms, boiler installation and servicing, underfloor heating systems, central heating…
Serves homeowners, landlords and businesses needing domestic or commercial property services across Cardiff, Penarth, the Vale of Glamorgan and surrounding areas.
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
Location
GAS GOLD LIMITED
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides domestic and commercial plumbing and heating services, including boiler installations, central heating repairs, gas safety checks, emergency plumbing, radiator and pump repairs, kitchen and…
Serves homeowners, landlords, property developers and commercial/corporate organisations in South Wales with domestic or commercial plumbing and heating needs for existing properties and new builds.
Financial Health
StableStable · 0% CAGR over 2y
Location
ERIC COLLIER & SON GAS ENGINEERS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides installation, repair and maintenance of gas, oil and LPG boilers and central heating systems for domestic and commercial properties. Also offers air conditioning, warm air heaters, heat…
Serves homeowners, landlords, commercial businesses and educational premises across Cardiff, Newport, Swansea and South Wales with needs for gas, oil, LPG heating, air conditioning and refrigeration…
Financial Health
WeakWeak · -76% CAGR over 3y
Location
Westlink Mechanical Services Limited
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides plumbing, heating and mechanical building services for commercial construction projects, including system design, planning, installation and maintenance. Also delivers ventilation systems,…
Serves B2B clients in commercial construction, including main contractors, healthcare trusts, project managers and facilities teams, plus some domestic maintenance customers across South Wales and…
Financial Health
StrongStrong · Growing, Hiring · 8% CAGR over 3y
Location
A.Wootton Heating Services Limited
Trajectory
3y · 2022–NowFinancial sub-scores
Computed from 3 filingsProvides installation, servicing and repair of gas boilers and appliances, central heating systems, and oil‑fired heating equipment. Also issues landlord gas safety certificates, performs…
Serves homeowners, landlords and domestic property owners across NP, CF and BS postcodes, including Newport, Cardiff, Bristol, Bridgend and Chepstow.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
Multi-Heat Services Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides installation, servicing and repair of heating, ventilation and air conditioning systems. Also offers boiler servicing, plumbing repairs, water hygiene services, gas testing and purging, TMV…
Serves homeowners and landlords in South Wales, plus commercial and industrial clients across the UK, including blue-chip property operators along the M4 corridor.
Financial Health
HealthyHealthy · -16% CAGR over 4y
Location
ECO WARMTH LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides electrical, heating, and plumbing services for residential and commercial properties, including boiler installation and repair, house rewiring, EV charger installation, leak and drainage…
Sells to homeowners, landlords and businesses needing heating, plumbing, electrical and renewable energy services, with a clear focus on residential customers in Cardiff and nearby areas.
Financial Health
WeakWeak · -6% CAGR over 4y
Location
C S BOXALL LIMITED
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides plumbing and heating services including boiler installation, repair and servicing, central heating installation and maintenance, bathroom installation, and emergency plumbing callouts. Also…
Serves homeowners, landlords, caravan and mobile home owners, and commercial or industrial property operators across Cardiff and South Wales.
Financial Health
WeakWeak · 0% CAGR over 2y
Location
JSH PLUMBING & HEATING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides domestic plumbing and heating services including installation, servicing and repair of boilers, central heating systems and radiators. Also installs bathrooms, underfloor heating, heat pumps…
Serves domestic customers, landlords and residential property owners in Barry, the Vale of Glamorgan and surrounding areas.
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
Location
I.S.T.L. Engineering Limited
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsProvides mechanical and electrical contracting services for construction projects, including installation of heating, plumbing, ventilation, air conditioning, power and lighting, fire alarms, CCTV,…
Serves B2B and public-sector clients in construction, commercial property, social housing, education, energy, healthcare, residential development and retail.
Financial Health
StrongStrong · Growing, Hiring · 18% CAGR over 3y
Location
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How Cardiff Plumbing companies work and how to sell to them
What they do
Cardiff plumbing contractors usually earn through a mix of labour charges, parts margin, fixed-price installation work and repeat maintenance agreements. Reactive domestic work is priced around call-out fees, hourly rates and emergency premiums, while boiler, heating, bathroom and kitchen jobs tend to be quoted as scoped projects with materials included. Landlord and facilities work often adds scheduled servicing, compliance paperwork and repeat attendance, creating steadier income than one-off repairs. Contractors taking mechanical-services packages on local projects also carry coordination and cashflow risk, because their revenue depends on programme timing, snagging and payment from the main contractor.
Who they sell to
Buyers are usually practical rather than committee-led. Householders and landlords buy on availability, trust and evidence of certification; letting agents and facilities managers care more about response times, job records and repeatable pricing. Local builders, refurbishment firms and small construction buyers tend to procure through quotes, preferred-trade relationships and subcontract packages rather than formal RFPs. Domestic jobs can close on the same day if the issue is urgent, while planned maintenance, refurbishments and commercial premises work may take longer because access, insurance, site rules and materials need agreeing. Decision-makers are commonly owner-managers, property managers, site managers, facilities leads and finance staff approving spend.
What they buy
Most operators tend to spend on tools that reduce office friction and keep engineers billable. Field-service management, scheduling, route planning, quoting, invoicing, card payment, job-costing and accounting software are natural fit categories, especially where a contractor has moved beyond paper diaries and messaging apps. Compliance storage, health-and-safety documentation, fleet management, insurance, payroll, HR records, apprenticeship administration and training services also map to their operating model. Growth-minded firms may buy local search marketing, review management, call handling, recruitment support and materials-procurement services. For sellers, the practical buyer question is usually whether the offer saves admin time, improves attendance discipline or protects margin on quoted work.
Why and how to sell to them
Missed calls, late payment, engineer downtime, repeat visits and materials delays are common reasons plumbing firms review suppliers. Commercial intent often appears when a contractor wins landlord or facilities work, adds schedulers, hires engineers, expands vans, takes on larger installation packages or starts separating domestic repair from project delivery. Seasonal heating demand can also expose weak booking, stock and customer-communication processes. Outbound tends to work better when framed around measurable operational pressure: fewer no-access visits, faster quote-to-cash, cleaner service records, easier compliance evidence or better margin visibility. Owner-managed contractors may resist abstract efficiency claims, so proof tied to field teams and cash collection is usually more credible.
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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