- Companies
- Civil engineering
- Colchester
- C. S. Mason Contracts Limited
C. S. Mason Contracts Limited
- Company number
- 04216683
- Incorporated
- 15 May 200125 years trading
- Registered office
- Middleborough House, 16 Middleborough, Colchester, Essex, CO1 1QT
- Nature of business
- Construction of other civil engineering projects n.e.c.
C. S. Mason Contracts Limited is a 25-year-old private limited company registered in Colchester, company number 04216683, one of 103 civil engineering contractors in Colchester. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 £8,868 (+8.2%) on the year before, to £117K.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £280K against £234K owed within a year: 1.2 times cover.
- 7 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £117K | £7,640 | £280K | £234K | 7 |
| 31 Dec 2024 | £108K | £48K | £278K | £207K | 7 |
| 31 Dec 2023 | £106K | £89K | £392K | £294K | 7 |
| 31 Dec 2022 | £57K | £111K | £259K | £171K | 10 |
| 31 Dec 2021 | £54K | £42K | £283K | £162K | 11 |
| 31 Dec 2020 | -£37K | £59K | £216K | £177K | 10 |
| 31 Dec 2019 | -£60K | £9,752 | £162K | £258K | 12 |
| 31 Dec 2018 | -£85K | £86K | £272K | £291K | 8 |
| 31 Dec 2017 | -£149K | £0 | £19K | £27K | 5 |
| 31 Dec 2016 | -£151K | £2,880 | £14K | £36K | 5 |
Where C. S. Mason Contracts Limited is registered
The registered office is in Colchester (CO1), in the Colchester local authority area, East of England. Show CO1 1QT on a map.
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Shared registered office
69 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if C. S. Mason Contracts 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 04216683
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 May 2001 (25 years ago)
- Registered office
- Middleborough House, 16 Middleborough, Colchester, Essex, CO1 1QT
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 5 June 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 Colchester
Other active civil engineering contractors registered in Colchester.
- CDRP Limited2023
- Chevis Engineering Ltd2026
- Conlon Surfacing Limited2025
- Cook and Long Limited2005
- Coopers Groundworks & Civil Engineering Ltd2022
- CTM Groundworks Ltd2025
- D.B.S.Builders Limited1988
- D.J. Barton Associates Limited1994
All civil engineering contractors in Colchester · All trades in Colchester · Civil engineering across the UK
Frequently asked questions
When are C. S. Mason Contracts Limited's accounts due?
C. S. Mason Contracts Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is C. S. Mason Contracts Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is C. S. Mason Contracts Limited still trading?
C. S. Mason Contracts 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. S. Mason Contracts Limited do?
C. S. Mason Contracts Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is C. S. Mason Contracts Limited?
C. S. Mason Contracts Limited was incorporated on 15 May 2001, 25 years ago.
What is the penalty if C. S. Mason Contracts 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. S. Mason Contracts 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.