Plumbing And Heating Companies in Swansea: 194 Active Firms (2026)
Plumbing and heating contractors install, maintain and repair water, gas and heat systems for homes and commercial premises around Swansea.
Buying decisions tend to sit with homeowners, landlords, facilities managers, main contractors and public-sector estates teams rather than a single procurement centre. Work ranges from emergency call-outs and planned servicing to bathroom refits, boiler replacements, pipework packages and mechanical-services projects within wider construction jobs. The buyer mix matters: domestic customers usually buy on trust, response time and visible competence, while commercial and public-sector customers expect documentation, insurance, planned maintenance cover and the ability to coordinate around occupied sites. Most engagements appear locally managed, with recurring maintenance providing continuity between project-led installation work.
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Swansea has 194 active plumbing and heating contractors, a cohort that looks more like a local building-services supply base than a thin specialist niche. Reported employment totals 622 people, although field-engineer capacity is likely to be unevenly distributed between owner-managed trades, small maintenance teams and the firms able to take on larger commercial packages. The city’s housing stock, landlord market, public estates and coastal commercial premises all create demand for repairs, servicing and replacement work, while construction subcontracting adds a more cyclical source of project revenue.
Gas, water and heating work brings a practical compliance burden: safe work on appliances and pipework, evidence of competent engineers, insurance, site risk paperwork and service records that landlords, facilities managers and public-sector estates teams can audit. Market structure reinforces that discipline rather than removing it. Only one Swansea contractor sits above £5M of reported turnover, so many suppliers are likely to compete through responsiveness, repeat maintenance relationships and subcontract packages rather than through broad regional coverage. For buyers, paperwork and availability can matter as much as trade capability.
Growth in this segment appears likely to remain practical rather than headline-led. Recurring servicing, repair call-outs and replacement work tend to keep local contractors busy, but scale is constrained by engineer availability, van-based geography and the need to supervise work closely. The cohort has a noticeable small-business bias, so succession, acquisition by neighbouring building-services groups and informal subcontract networks may shape the market more than standalone expansion. Buyers are also likely to keep asking for clearer documentation, faster response times and evidence of safe working, which favours operators that can combine trade capacity with administrative discipline.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
194
Active firms
2026
60
Recent incorporations
since 2022
1
Above £5M
reported revenue
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Key facts
About 1% of the trading cohort reports turnover above £5M (1 of 194 firms) — the rest sits below that revenue band.
30% of the cohort was incorporated since 2022 (60 firms), so a sizeable share is in its first few filing cycles.
Emergency repair work, planned maintenance and replacement cycles give Swansea contractors recurring local demand alongside project-led installation work.
The buyer base spans homes and commercial premises, so operators tend to balance call-out work with scheduled servicing and system replacement.
Water, gas and heat-system work places the trade close to property maintenance, facilities management and small-scale construction procurement.
Top Swansea Plumbing And Heating companies
Financial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -10% CAGR over 4y
Location
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Financial sub-scores
Computed from 5 filingsProvides plumbing, heating, gas and electrical services for domestic and commercial properties, including boiler installation and servicing, building maintenance, plant room work, safety checks and…
Serves private households and large organisations in Wales, including local councils, social housing providers, church bodies and public-sector sites such as schools, nursing homes and leisure…
Financial Health
StrongStrong · Growing, Hiring · 7% CAGR over 4y
Location
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Computed from 5 filingsProvides plumbing and heating services including boiler installations, gas central heating conversions, servicing, landlord gas safety certificates, and maintenance. Installs heating and sanitaryware…
Serves major and local housebuilders, domestic homeowners and landlords, plus commercial clients including supermarket retailers, warehouses, schools and care homes, mainly in South Wales.
Financial Health
WeakWeak · -3% CAGR over 4y
Location
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Computed from 5 filingsProvides domestic gas and plumbing services including boiler installation, servicing and repairs, central heating installation and maintenance, gas safety inspections, landlord safety certificates,…
Serves domestic customers, homeowners and landlords needing heating, plumbing and gas services across Swansea, Neath, Port Talbot and surrounding areas.
Financial Health
WeakWeak · -4% CAGR over 4y
Location
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Computed from 5 filingsProvides domestic gas and heating services including boiler installation, servicing and repairs, central heating system design and upgrades, maintenance care plans, landlord gas safety inspections,…
Serves domestic customers in Swansea and South Wales, primarily homeowners and landlords responsible for boilers, central heating systems and gas appliances.
Financial Health
StableStable · Hiring · 14% CAGR over 4y
Location
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Provides plumbing, heating and gas engineering services for residential properties. Installs, repairs and services boilers and central heating systems, conducts landlord gas safety inspections, and…
Serves homeowners and private landlords in Swansea and South Wales, including domestic property owners and rental property managers needing gas, heating and plumbing support.
Financial Health
N/AN/A
Location
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Computed from 5 filingsProvides heating and plumbing services including installation, servicing and repair of gas, oil and electric boilers, commercial heating systems and air conditioning. Also offers powerflushing, water…
Serves domestic homeowners, private landlords and commercial premises owners/managers, including customers with gas, LPG or oil heating systems and those seeking finance or boiler cover.
Financial Health
HealthyHealthy · Growing, Hiring · 5% CAGR over 4y
Location
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Computed from 5 filingsProvides installation, maintenance and repair of air conditioning, heating, refrigeration and ventilation systems, along with plumbing services. Offers HVAC inspections, system commissioning and…
Financial Health
HealthyHealthy · -2% CAGR over 4y
Location
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Computed from 3 filingsProvides building services engineering including design, installation and maintenance of mechanical, electrical and plumbing systems. Delivers MEP contracting, renewable energy integration, and…
Serves B2B and public-sector clients across pharmaceuticals, commercial property, education, healthcare, hospitality, residential, leisure and student accommodation sectors, typically on larger or…
Financial Health
HealthyHealthy · -18% CAGR over 2y
Location
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Computed from 5 filingsProvides repair, servicing and installation of domestic gas‑fired central heating boilers and heating systems. Offers boiler service care contracts and landlord gas safety inspections, and acts as an…
Serves homeowners and residential landlords across South Wales with domestic gas central heating systems, including customers seeking service contracts and landlord gas safety inspections.
Financial Health
WeakWeak · -6% CAGR over 4y
Location
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Financial Health
N/AN/A
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Financial sub-scores
Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 32% CAGR over 4y
Location
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Computed from 5 filingsProvides mechanical and electrical building services including installation and maintenance of air conditioning, building management systems, electrical systems, gas heating and hot water systems,…
Serves public, private and third-sector organisations across the UK, including commercial property operators, education providers, housing organisations, leisure and entertainment venues, healthcare…
Financial Health
StableStable · -12% CAGR over 4y
Location
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Computed from 5 filingsFinancial Health
StrongStrong
Location
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Computed from 5 filingsFinancial Health
StableStable · Hiring · 6% CAGR over 4y
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Computed from 3 filingsFinancial Health
StrongStrong · Hiring · 57% CAGR over 2y
Location
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Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
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Computed from 4 filingsFinancial Health
StrongStrong · Growing, Hiring · 26% CAGR over 3y
Location
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Computed from 5 filingsFinancial Health
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Computed from 5 filingsProvides property maintenance and refurbishment services including kitchen and bathroom installation, disabled access adaptations, roofing, plumbing and electrical work, and full building renovations…
Serves housing associations, private businesses and the general public in South Wales, including residential and business property owners and customers needing adaptations for disabled or elderly…
Financial Health
StableStable · -3% CAGR over 5y
Location
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Computed from 2 filingsFinancial Health
DistressedDistressed · 0% CAGR over 1y
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Computed from 5 filingsFinancial Health
StableStable
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Computed from 5 filingsFinancial Health
HealthyHealthy · -24% CAGR over 4y
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N/AN/A
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Computed from 2 filingsFinancial Health
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Computed from 3 filingsFinancial Health
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Computed from 3 filingsFinancial Health
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Computed from 4 filingsFinancial Health
DistressedDistressed
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Computed from 3 filingsFinancial Health
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Computed from 5 filingsFinancial Health
StrongStrong · Hiring · 19% CAGR over 4y
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Computed from 5 filingsFinancial Health
StableStable · Hiring · 24% CAGR over 4y
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Computed from 2 filingsProvides property maintenance, repair and cleaning services for residential and commercial buildings, including plumbing and electrical work, roofing and gutter repairs, painting and decorating,…
Serves homeowners, landlords, offices and commercial property owners with residential and commercial buildings.
Financial Health
DistressedDistressed · 0% CAGR over 1y
Location
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Computed from 5 filingsFinancial Health
WeakWeak · Hiring · 14% CAGR over 4y
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Computed from 2 filingsFinancial Health
StableStable · Hiring · 50% CAGR over 1y
Location
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Computed from 5 filingsFinancial Health
StableStable · -63% CAGR over 5y
Location
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Computed from 5 filingsFinancial Health
WeakWeak
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Computed from 4 filingsFinancial Health
DistressedDistressed · -21% CAGR over 3y
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Computed from 5 filingsFinancial Health
DistressedDistressed · -7% CAGR over 4y
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How Swansea Plumbing And Heating companies work and how to sell to them
What they do
Revenue usually comes from a blend of labour, materials margin and contracted availability. Smaller domestic jobs are often priced as call-out fees, hourly rates or fixed quotes, while boiler replacements, bathroom refits and plant-room work tend to be quoted as project packages with materials included. Commercial and public-sector work more often runs through planned maintenance agreements, schedule-of-rates arrangements or subcontract packages within wider construction jobs. The service is therefore partly trade labour and partly logistics: vans, parts, engineer diaries, safety paperwork, photographs, completion notes and invoices all have to move together.
Who they sell to
Customers range from homeowners and private landlords to letting agents, facilities managers, main contractors and public-sector estates teams. Domestic decisions are usually made by the owner or landlord, with speed, trust and visible competence carrying weight. Commercial work tends to involve facilities managers, contracts managers, site managers, quantity surveyors or procurement officers, with insurance, references, risk paperwork and service records checked before work starts. Sales cycles are short for emergencies and small repairs, but planned maintenance and construction packages typically take longer, especially where supplier approval or tendering is involved.
What they buy
Most Swansea plumbing and heating firms tend to spend on tools, vehicles, parts supply, insurance and accounting support before they buy specialist software. As they add engineers or take on more maintenance work, the buying list usually widens to job management systems, scheduling, quoting, CRM, invoicing, payment collection, stock control and document storage for safety records. Firms with commercial contracts may also look for health and safety support, bid writing, payroll, HR, recruitment, vehicle tracking, call handling and local marketing services. Anything that reduces diary gaps, missed calls or invoice lag is likely to be easier to justify.
Why and how to sell to them
A missed emergency call, a delayed certificate or an unpaid invoice can hit cash flow quickly in this trade. Buyers tend to evaluate suppliers when they add engineers, take on landlord portfolios, win a maintenance contract, buy more vans or move from domestic work into commercial sites. Around 60 Swansea plumbing and heating firms have been incorporated since 2022, so some will still be putting basic systems, finance processes and local demand generation in place. Sales approaches are likely to land better when they reference practical constraints: engineer time, parts availability, proof of safe working, margin on fixed-price jobs and paperwork for main contractors or estates teams.
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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