- Companies
- Civil engineering
- Port Talbot
- S.J. Controls Limited
S.J. Controls Limited
- Company number
- 03743214
- Incorporated
- 30 Mar 199927 years trading
- Registered office
- 19 ST Catherines Court, Baglan, Port Talbot, West Glamorgan, SA12 8AJ
- Nature of business
- Construction of other civil engineering projects n.e.c.
S.J. Controls Limited is a 27-year-old private limited company registered in Port Talbot, company number 03743214, one of 17 civil engineering contractors in Port Talbot. 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 £33K (+97.4%) on the year before, to £66K.
- Net assets rose in 6 of 8 year-on-year comparisons on record.
- Current assets of £109K against £18K owed within a year: 6.1 times cover.
- 5 employees on average, up from 2 the year before.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £66K | £109K | £18K | 5 | |
| 31 Mar 2024 | £34K | £16K | 2 | ||
| 31 Mar 2023 | £19K | £27K | £45K | 7 | |
| 31 Mar 2022 | £21K | £79K | £49K | 7 | |
| 31 Mar 2021 | £19K | £92K | £60K | 7 | |
| 31 Mar 2020 | £10K | £40K | £42K | 4 | |
| 31 Mar 2019 | £13K | £50K | £43K | 4 | |
| 31 Mar 2018 | £3,043 | £37K | £40K | 4 | |
| 31 Mar 2017 | £2,854 | £41K | £41K | 5 |
Where S.J. Controls Limited is registered
The registered office is in Port Talbot (SA12), in the Neath Port Talbot local authority area, Wales. Show SA12 8AJ on a map.
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- Sherwood's Carpentry and Building Services LtdBuilders
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What happens if S.J. Controls 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
- 03743214
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 March 1999 (27 years ago)
- Registered office
- 19 ST Catherines Court, Baglan, Port Talbot, West Glamorgan, SA12 8AJ
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 17 March 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 Port Talbot
Other active civil engineering contractors registered in Port Talbot.
- SCH Engineering Services Ltd2023
- Wellshill Civils & Plant Limited2016
- 2006 Ltd2015
- Accur8 Building and Project Management Ltd2024
- Afan Landscapes Limited1979
- Afan Treescapes Limited2020
- Altura Energy Limited2026
- Astoria Project Services Limited2022
All civil engineering contractors in Port Talbot · All trades in Port Talbot · Civil engineering across the UK
Frequently asked questions
When are S.J. Controls Limited's accounts due?
S.J. Controls 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 S.J. Controls 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 S.J. Controls Limited still trading?
S.J. Controls 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 S.J. Controls Limited do?
S.J. Controls Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is S.J. Controls Limited?
S.J. Controls Limited was incorporated on 30 March 1999, 27 years ago.
What is the penalty if S.J. Controls 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 S.J. Controls 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.