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Builder companies in the Belfast area

1,739 builder companies have a registered office in the Belfast area (BT postcodes), and 189 of them were formed in 2025 or 2026. In their latest accounts, the typical one held £45,592 in cash and owed £97,182 at year end.

Companies House register, 1 September 2026, and accounts filed in the last twelve months. Compared with the official category “Construction of domestic buildings” (SIC 41202). Covers companies with a registered office in BT postcodes, including Belfast, Derry, Londonderry, Lisburn.

The numbers

Builder companies in the Belfast area (BT postcodes) compared with the same category across the UK. Typical figures are medians.
MeasureBelfastUK
Registered companies1,73971,271
Formed in 2025 or 2026189 (11%)23%
Being struck off or in liquidation155 (8.9%)13%
Typical cash at year end£45,592468 accounts£11,355
Typical amount owed at year end£97,1821,060 accounts£28,652
Typical number of employees11,116 accounts1

What this means if you’re starting one

Cash is tight in this trade

At year end the typical builder company in the Belfast area (BT postcodes) holds £45,592 in cash and owes £97,182; that cash figure is lower than 81% of UK industries.

Typical operators end the year holding less cash than they owe, so there is little slack if takings dip or a big bill lands early.

You will be up against established operators

11% of the 1,739 builder companies in the Belfast area (BT postcodes) were formed in 2025–26, against 19% of all companies in the Belfast area (BT postcodes).

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

Most of these businesses are run by one or two people

The typical builder company in the Belfast area (BT postcodes) reports 1 employee; the top quarter has 2 or more (1,116 filings).

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

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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.

Builder in other places

Other businesses in Belfast

All business benchmarks in Belfast