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Plumber companies in the Belfast area

672 plumber companies have a registered office in the Belfast area (BT postcodes), and 126 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £44,733 in cash and owed £47,685 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 BT postcodes, including Belfast, Derry, Londonderry, Lisburn.

The numbers

Plumber companies in the Belfast area (BT postcodes) compared with the same category across the UK. Typical figures are medians.
MeasureBelfastUK
Registered companies67246,469
Formed in 2025 or 2026126 (19%)20%
Being struck off or in liquidation52 (7.7%)9.4%
Typical cash at year end£44,733156 accounts£16,864
Typical amount owed at year end£47,685400 accounts£23,246
Typical number of employees2433 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 Belfast area (BT postcodes) reports 2 employees; the top quarter has 4 or more (433 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 Belfast?

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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 Belfast

All business benchmarks in Belfast