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Plumber companies in the Southampton area

497 plumber companies have a registered office in the Southampton area (SO postcodes), and 61 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £20,112 in cash and owed £29,379 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). Covers companies with a registered office in SO postcodes, including Southampton, Winchester, Eastleigh.

The numbers

Plumber companies in the Southampton area (SO postcodes) compared with the same category across the UK. Typical figures are medians.
MeasureSouthamptonUK
Registered companies49746,469
Formed in 2025 or 202661 (12%)20%
Being struck off or in liquidation61 (12%)9.4%
Typical cash at year end£20,112175 accounts£16,864
Typical amount owed at year end£29,379328 accounts£23,246
Typical number of employees1332 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 the Southampton area (SO postcodes) reports 1 employee; the top quarter has 3 or more (332 filings).

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

You will be up against established operators

12% of the 497 plumber companies in the Southampton area (SO postcodes) were formed in 2025–26, against 17% of all companies in the Southampton area (SO postcodes).

Few new companies are entering, so your customers will compare you with businesses that have years of reviews and regulars.

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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 Southampton

All business benchmarks in Southampton