- Companies
- Civil engineering
- Royston
- John Cobb & Sons Limited
John Cobb & Sons Limited
- Company number
- 01006650
- Incorporated
- 1 Apr 197155 years trading
- Registered office
- Barrington Road, Orwell, Royston, Hertfordshire, SG8 5QP
- Nature of business
- Construction of other civil engineering projects n.e.c.
John Cobb & Sons Limited is a 55-year-old private limited company registered in Royston, company number 01006650, one of 7 civil engineering contractors in Royston. 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 £153K (+7%) on the year before, to £2.3M.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £2M against £243K owed within a year: 8.0 times cover.
- 12 employees on average, down from 14 the year before.
- 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 Mar 2025 | £2.3M | £1.8M | £2M | £243K | 12 |
| 31 Mar 2024 | £2.2M | £1.5M | £1.8M | £312K | 14 |
| 31 Mar 2023 | £1.9M | £1.4M | £1.6M | £205K | 12 |
| 31 Mar 2022 | £1.7M | £1.3M | £1.5M | £248K | 9 |
| 31 Mar 2021 | £1.4M | £1M | £1.2M | £278K | 9 |
| 31 Mar 2020 | £1.3M | £849K | £1.1M | £292K | 9 |
| 31 Mar 2019 | £1.2M | £660K | £905K | £203K | |
| 31 Mar 2018 | £1.1M | £601K | £764K | £177K | |
| 31 Mar 2017 | £940K | £472K | £673K | £223K | |
| 31 Mar 2016 | £824K | £302K | £500K | £165K |
Who runs and owns John Cobb & Sons Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (5)
| Name | Role | Appointed |
|---|---|---|
| J*** C*** | Director | before Jun 1991 |
| J*** C*** | Director | Feb 2016 |
| J*** C*** | Director | Feb 2016 |
| K*** C*** | Director | Feb 2016 |
| J*** C*** | Secretary | Aug 2006 |
3 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| J*** C*** | Secretary | Mar 1994 | |
| M*** C*** | Secretary | Mar 1994 | Aug 2006 |
| M*** C*** | Director | Mar 1994 |
People with significant control (2)
Charges (secured borrowing)
All 5 registered charges have been satisfied. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| The Governor And Company Of The Bank Of Ireland | Satisfied Nov 2016 | Feb 2003 |
| Barclays Bank PLC | Satisfied Mar 2013 | Jun 1996 |
| Barclays Bank PLC | Satisfied Mar 2013 | Jun 1996 |
| Barclays Bank PLC | Satisfied Mar 2013 | Feb 1988 |
| Barclays Bank PLC | Satisfied May 2013 | Jul 1985 |
Where John Cobb & Sons Limited is registered
The registered office is in Royston (SG8), in the South Cambridgeshire local authority area, East of England. Show SG8 5QP on a map.
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What happens if John Cobb & Sons 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
- 01006650
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 April 1971 (55 years ago)
- Registered office
- Barrington Road, Orwell, Royston, Hertfordshire, SG8 5QP
- 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
- 5 June 2026
- Charges (mortgages)
- 0 outstanding of 5 registered
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 Royston
Other active civil engineering contractors registered in Royston.
- North Herts Surfacing Limited1989
- RJ Sol-Comm Solutions Ltd2025
- Toucan 2 Limited2002
- Trienergi Ltd2025
- A & T Property Management Limited2003
- BP Consultant Limited2023
All civil engineering contractors in Royston · All trades in Royston · Civil engineering across the UK
Frequently asked questions
When are John Cobb & Sons Limited's accounts due?
John Cobb & Sons 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 John Cobb & Sons 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 John Cobb & Sons Limited still trading?
John Cobb & Sons 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 John Cobb & Sons Limited do?
John Cobb & Sons Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is John Cobb & Sons Limited?
John Cobb & Sons Limited was incorporated on 1 April 1971, 55 years ago.
Who runs John Cobb & Sons Limited?
John Cobb & Sons Limited has 4 active directors, the longest-serving appointed in Feb 2016. Their names and service addresses are on the Companies House register.
Who owns John Cobb & Sons Limited?
2 people or companies have significant control of John Cobb & Sons Limited: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if John Cobb & Sons 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 John Cobb & Sons 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.