- Companies
- Civil engineering
- GJM and Sons Limited
GJM and Sons Limited
- Company number
- 14394287
- Incorporated
- 3 Oct 20224 years trading
- Registered office
- 1 Vincent Avenue, Nantyglo, Gwent, NP23 4PE
- Nature of business
- Construction of utility projects for electricity and telecommunications
GJM and Sons Limited is a 4-year-old private limited company registered in Nantyglo, company number 14394287, one of the UK's civil engineering contractors. Companies House shows its accounts as overdue: they were due on 31 July 2026.
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 £75K (-86.9%) on the year before, to £11K.
- Current assets of £48K against £47K owed within a year: 1.0 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 2 years, 2023 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Oct 2024 | £11K | £13K | £48K | £47K | 2 |
| 31 Oct 2023 | £86K | £3,667 | £97K | £24K | 1 |
Where GJM and Sons Limited is registered
The registered office is in Nantyglo (NP23), in the Blaenau Gwent local authority area, Wales. Show NP23 4PE on a map.
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What happens if GJM and Sons Limited files late
If the accounts reach Companies House today, the late filing penalty is £375 (£750 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2026 to 31 Aug 2026 | £150 |
| 1 to 3 months late | 1 Sep 2026 to 31 Oct 2026 | £375 |
| 3 to 6 months late | 1 Nov 2026 to 31 Jan 2027 | £750 |
| More than 6 months late | From 1 Feb 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2026 | £200 |
| 3 months late | 31 Jan 2027 | another £200 |
| 6 months late | 30 Apr 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 2027 | 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
- 14394287
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 October 2022 (4 years ago)
- Registered office
- 1 Vincent Avenue, Nantyglo, Gwent, NP23 4PE
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2024
- Last confirmation statement
- 2 October 2025
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
Other active civil engineering contractors.
Frequently asked questions
When are GJM and Sons Limited's accounts due?
GJM and Sons Limited's accounts were due at Companies House on 31 July 2026 and the register shows them as overdue.
When is GJM and Sons Limited's CT600 due?
The CT600 for the period to 31 October 2025 is due at HMRC by 31 October 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2026.
Is GJM and Sons Limited still trading?
GJM and Sons Limited is listed as active on the Companies House register (checked 13 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 GJM and Sons Limited do?
GJM and Sons Limited is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is GJM and Sons Limited?
GJM and Sons Limited was incorporated on 3 October 2022, 4 years ago.
What is the penalty if GJM and 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 GJM and Sons Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.