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Plumber companies in London

4,004 plumber companies have a registered office in London, and 1,270 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £9,619 in cash and owed £14,122 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 London compared with the same category across the UK. Typical figures are medians.
MeasureLondonUK
Registered companies4,00446,469
Formed in 2025 or 20261,270 (32%)20%
Being struck off or in liquidation457 (11%)9.4%
Typical cash at year end£9,619742 accounts£16,864
Typical amount owed at year end£14,1221,902 accounts£23,246
Typical number of employees11,913 accounts1

What this means if you’re starting one

London has fewer of these businesses than most places

Plumber companies are 0.36% of companies registered in London, against 0.85% UK-wide (0.4× the national share).

That could be a gap or a sign of weak demand. The register cannot tell which.

Most of these businesses are run by one or two people

The typical plumber company in London reports 1 employee; the top quarter has 2 or more (1,913 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 London?

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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 London

All business benchmarks in London