- Companies
- Civil engineering
- Wednesbury
- JS1 Construction Ltd
JS1 Construction Ltd
- Company number
- 12415465
- Incorporated
- 21 Jan 20206 years trading
- Registered office
- 42 Dorsett Road, Darlaston, Wednesbury, West Midlands, WS10 8TW
- Nature of business
- Construction of other civil engineering projects n.e.c.
JS1 Construction Ltd is a 6-year-old private limited company registered in Wednesbury, company number 12415465, one of 36 civil engineering contractors in Wednesbury. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 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 £68K (+163.9%) on the year before, to £109K.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £260K against £184K owed within a year: 1.4 times cover.
- 16 employees on average, up from 10 the year before.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £109K | £102K | £260K | £184K | 16 |
| 31 Jan 2024 | £41K | £37K | £95K | £53K | 10 |
| 31 Jan 2023 | -£24K | £127K | £151K | 2 | |
| 31 Jan 2022 | -£28K | £1,487 | £123K | £151K | 2 |
| 31 Jan 2021 | £46K | £40K | £86K | 1 |
Where JS1 Construction Ltd is registered
The registered office is in Wednesbury (WS10), in the Walsall local authority area, West Midlands. Show WS10 8TW on a map.
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What happens if JS1 Construction Ltd 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 12415465
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 January 2020 (6 years ago)
- Registered office
- 42 Dorsett Road, Darlaston, Wednesbury, West Midlands, WS10 8TW
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 13 January 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 Wednesbury
Other active civil engineering contractors registered in Wednesbury.
- Kanyi Ltd2024
- L.P. Business Services Ltd2025
- LG Groundwork & Landscapes Ltd2026
- One Fibre Telecoms Ltd2022
- Quality UK Construction Ltd2025
- RMT Civil Works Ltd2025
- SJC Business Services WM Ltd2025
- SM Building & Groundworks Ltd.2020
All civil engineering contractors in Wednesbury · All trades in Wednesbury · Civil engineering across the UK
Frequently asked questions
When are JS1 Construction Ltd's accounts due?
JS1 Construction Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is JS1 Construction Ltd's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is JS1 Construction Ltd still trading?
JS1 Construction Ltd 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 JS1 Construction Ltd do?
JS1 Construction Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is JS1 Construction Ltd?
JS1 Construction Ltd was incorporated on 21 January 2020, 6 years ago.
What is the penalty if JS1 Construction Ltd 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 JS1 Construction Ltd 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.