- Companies
- Civil engineering
- Dunmow
- Cos Civil Engineering Limited
Cos Civil Engineering Limited
- Company number
- 13290859
- Incorporated
- 25 Mar 20215 years trading
- Registered office
- 13 Dragonfly Close, Dunmow, CM6 4GD
- Nature of business
- Construction of other civil engineering projects n.e.c.
Cos Civil Engineering Limited is a 5-year-old private limited company registered in Dunmow, company number 13290859, one of 8 civil engineering contractors in Dunmow. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
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 up £14K (+8.5%) on the year before, to £181K.
- Net assets rose in 3 of 3 year-on-year comparisons on record.
- Current assets of £159K against £108K owed within a year: 1.5 times cover.
- 4 employees on average, up from 2 the year before.
- Balance sheets on record for 4 years, 2022 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £181K | £129K | £159K | £108K | 4 |
| 31 Mar 2024 | £166K | £61K | £167K | £95K | 2 |
| 31 Mar 2023 | £81K | £104K | £128K | £137K | 2 |
| 31 Mar 2022 | £38K | £64K | £81K | £88K | 2 |
Where Cos Civil Engineering Limited is registered
The registered office is in Dunmow (CM6), in the Uttlesford local authority area, East of England. Show CM6 4GD on a map.
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What happens if Cos Civil Engineering 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2028 | 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
- 13290859
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 March 2021 (5 years ago)
- Registered office
- 13 Dragonfly Close, Dunmow, CM6 4GD
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 28 July 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 Dunmow
Other active civil engineering contractors registered in Dunmow.
- Downlands Water Storage UK Ltd2026
- DW Surfaces Limited2025
- Felsted Construction Ltd2004
- Highline Roadmarkings Ltd1998
- Rectory Groundworks Limited2011
- Atm Solar Ltd2024
- Bailey Site Solutions Limited2025
All civil engineering contractors in Dunmow · All trades in Dunmow · Civil engineering across the UK
Frequently asked questions
When are Cos Civil Engineering Limited's accounts due?
Cos Civil Engineering Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Cos Civil Engineering Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Cos Civil Engineering Limited still trading?
Cos Civil Engineering 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 Cos Civil Engineering Limited do?
Cos Civil Engineering Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Cos Civil Engineering Limited?
Cos Civil Engineering Limited was incorporated on 25 March 2021, 5 years ago.
What is the penalty if Cos Civil Engineering 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 Cos Civil Engineering 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.