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  1. Companies
  2. Civil engineering
  3. Mountain Ash

Civil engineering · Mountain Ash

Civil engineering in Mountain Ash

12 active civil engineering contractors registered in Mountain Ash, Mid Glamorgan, with the date each one's next accounts are due at Companies House.

CompanySinceAccounts due
Air Jointing Limited20261 Feb 2028 (in 477 days)
C&M Jones Groundworks Limited202031 Dec 2027 (in 445 days)
Dan Rail Welding Ltd202031 May 2027 (in 231 days)
DSR Groundworks Ltd201528 Feb 2027 (in 139 days)
Evanhalli Ltd201930 Nov 2026 (in 49 days)
I Fix Reinforcements Ltd200831 Dec 2027 (in 445 days)
JLT Rail Limited202030 Apr 2027 (in 200 days)
JWG Utilities Limited201731 Jul 2027 (in 292 days)
Marton (Civil Engineering) Limited197631 Jan 2027 (in 111 days)
MDF Rail Limited201631 Mar 2027 (in 170 days)
Prizm Engineering Ltd202531 Dec 2027 (in 445 days)
R Lewis Rail Services Limited201431 Mar 2027 (in 170 days)

Civil engineering contractors in Mountain Ash in numbers

From the Companies House register and filed balance sheets, as of 1 Oct 2026. The longest-established is Marton (Civil Engineering) Limited, incorporated in 1976.

Companies
12
Active, small or micro accounts
New in the last 12 months
1
8% of the total
Typical net assets
£30K
Median of 11 latest balance sheets
Typical size
1 employee
Median average headcount
Accounts due in the next 3 months
1
Companies House deadlines

Still trading, by year incorporated

Active civil engineering contractors in Mountain Ash by year of incorporation01232017: 1 incorporated (still active)120172018: 0 incorporated (still active)020182019: 1 incorporated (still active)120192020: 3 incorporated (still active)320202021: 0 incorporated (still active)020212022: 0 incorporated (still active)020222023: 0 incorporated (still active)020232024: 0 incorporated (still active)020242025: 1 incorporated (still active)120252026: 1 incorporated (still active)12026
Active civil engineering contractors in Mountain Ash by year of incorporation01232017: 1 incorporated (still active)1'172018: 0 incorporated (still active)0'182019: 1 incorporated (still active)1'192020: 3 incorporated (still active)3'202021: 0 incorporated (still active)0'212022: 0 incorporated (still active)0'222023: 0 incorporated (still active)0'232024: 0 incorporated (still active)0'242025: 1 incorporated (still active)1'252026: 1 incorporated (still active)1'26

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

About civil engineering contractors

Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.

Other trades in Mountain Ash

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