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  1. Companies
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  3. Treharris

Company directory · Treharris

Trade and construction companies in Treharris

79 active trade and construction companies registered in Treharris, Mid Glamorgan, by trade.

Trade companies in Treharris in numbers

From the Companies House register and filed balance sheets, as of 1 Oct 2026. The longest-established is C & S Plastering Limited, incorporated in 1998.

Companies
79
Active, small or micro accounts
New in the last 12 months
18
23% of the total
Typical net assets
£16K
Median of 44 latest balance sheets
Typical size
2 employees
Median average headcount
Accounts due in the next 3 months
18
Companies House deadlines

Still trading, by year incorporated

Active trade companies in Treharris by year of incorporation010202017: 1 incorporated (still active)120172018: 2 incorporated (still active)220182019: 5 incorporated (still active)520192020: 5 incorporated (still active)520202021: 6 incorporated (still active)620212022: 4 incorporated (still active)420222023: 3 incorporated (still active)320232024: 10 incorporated (still active)1020242025: 16 incorporated (still active)1620252026: 16 incorporated (still active)162026
Active trade companies in Treharris by year of incorporation010202017: 1 incorporated (still active)1'172018: 2 incorporated (still active)2'182019: 5 incorporated (still active)5'192020: 5 incorporated (still active)5'202021: 6 incorporated (still active)6'212022: 4 incorporated (still active)4'222023: 3 incorporated (still active)3'232024: 10 incorporated (still active)10'242025: 16 incorporated (still active)16'252026: 16 incorporated (still active)16'26

Companies still active today, by the year they were incorporated; 2026 is the year so far.

Trades in Treharris

Every company on these pages is an active private limited company that files small or micro-entity accounts. Each one has to deliver accounts to Companies House within 9 months of its year end, pay corporation tax 9 months and 1 day after it, and file a CT600 with HMRC within 12 months.

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