- Companies
- Civil engineering
- Mountain Ash
- C&M Jones Groundworks Limited
C&M Jones Groundworks Limited
- Company number
- 12493193
- Incorporated
- 2 Mar 20206 years trading
- Registered office
- Glasfryn, Hamilton Street, Mountain Ash, CF45 3RH
- Nature of business
- Construction of other civil engineering projects n.e.c.
C&M Jones Groundworks Limited is a 6-year-old private limited company registered in Mountain Ash, company number 12493193, one of 12 civil engineering contractors in Mountain Ash. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £36K (-50.5%) on the year before, to £35K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £85K against £60K owed within a year: 1.4 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £35K | £85K | £60K | 1 | |
| 31 Mar 2025 | £71K | £206K | £154K | 1 | |
| 31 Mar 2024 | £57K | £65K | £25K | 1 | |
| 31 Mar 2023 | £28K | £41K | £18K | 1 | |
| 31 Mar 2022 | £29K | £32K | £10K | 1 | |
| 31 Mar 2021 | £17K | £15K | £3,524 | 2 |
Public contracts won
C&M Jones Groundworks Limited has one public sector contract award on record; the ones with their own published value total £300K (2026). Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Tai Calon Community Housing Ltd | STA25-0055 - Retaining Wall Anchoring | £300K | 2 Apr 2026 |
Where C&M Jones Groundworks Limited is registered
The registered office is in Mountain Ash (CF45), in the Rhondda Cynon Taf local authority area, Wales. Show CF45 3RH on a map.
Other trade companies in CF45
- Pro Guard Home Improvements LtdRoofers
- Smiths Rendering & Resin LtdBuilders
- Ironrootslandscaping LimitedLandscapers and gardeners
- Lee Griffiths Contractors LimitedFinishing trades
- Theglossboss LtdCleaning companies
- Brickzen Constructions LtdInstallers
- STR Drylining LtdBuilders
- Greenvoltinfrastructure LtdCivil engineering
What happens if C&M Jones Groundworks Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 12493193
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 March 2020 (6 years ago)
- Registered office
- Glasfryn, Hamilton Street, Mountain Ash, CF45 3RH
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 1 March 2026
Filing notes for 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.
Similar companies in Mountain Ash
Other active civil engineering contractors registered in Mountain Ash.
- Dan Rail Welding Ltd2020
- DSR Groundworks Ltd2015
- Evanhalli Ltd2019
- I Fix Reinforcements Ltd2008
- JLT Rail Limited2020
- JWG Utilities Limited2017
- Marton (Civil Engineering) Limited1976
- MDF Rail Limited2016
All civil engineering contractors in Mountain Ash · All trades in Mountain Ash · Civil engineering across the UK
Frequently asked questions
When are C&M Jones Groundworks Limited's accounts due?
C&M Jones Groundworks Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is C&M Jones Groundworks Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is C&M Jones Groundworks Limited still trading?
C&M Jones Groundworks Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does C&M Jones Groundworks Limited do?
C&M Jones Groundworks Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is C&M Jones Groundworks Limited?
C&M Jones Groundworks Limited was incorporated on 2 March 2020, 6 years ago.
Has C&M Jones Groundworks Limited won public sector contracts?
Yes. C&M Jones Groundworks Limited has one contract award from public bodies on Contracts Finder and Find a Tender (those with their own published value total £300K), most recently from Tai Calon Community Housing Ltd.
What is the penalty if C&M Jones Groundworks Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View C&M Jones Groundworks Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.