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Plumber companies in Cardiff

665 plumber companies have a registered office in Cardiff, and 138 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £18,843 in cash and owed £23,580 at year end.

Companies House register, 1 September 2026, and accounts filed in the last twelve months. Compared with the official category “Plumbing, heat and air-conditioning installation” (SIC 43220).

The numbers

Plumber companies in Cardiff compared with the same category across the UK. Typical figures are medians.
MeasureCardiffUK
Registered companies66546,469
Formed in 2025 or 2026138 (21%)20%
Being struck off or in liquidation197 (30%)9.4%
Typical cash at year end£18,843133 accounts£16,864
Typical amount owed at year end£23,580309 accounts£23,246
Typical number of employees1311 accounts1

What this means if you’re starting one

Most of these businesses are run by one or two people

The typical plumber company in Cardiff reports 1 employee; the top quarter has 3 or more (311 filings).

You are mostly up against owner-operators. Your own hours are likely to be your biggest cost, and the easiest one to undercount.

Planning a business like this in Cardiff?

Answer two questions about your customer and what makes you different, and get a free three-week plan to test the idea before you spend real money. No account or card.

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What these figures can’t tell you

Companies are counted where their registered office is, which may be an accountant or a home address rather than a shop. Sole traders and partnerships are not on the register, and electronically filed accounts cover roughly 60–75% of accounts filed each year. The figures describe companies that exist; they cannot prove demand for your idea or predict whether it will work. How the figures are built.

Plumber in other places

Other businesses in Cardiff

All business benchmarks in Cardiff