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- Sentinel Auto Security Ltd
Company profile · Electricians
Sentinel Auto Security Ltd
Sentinel Auto Security Ltd is a 3-year-old private limited company registered in Rochester, company number 15172795, one of 147 electrical contractors in Rochester. Companies House shows its accounts as overdue: they were due on 30 June 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where Sentinel Auto Security Ltd is registered
The registered office is in Rochester (ME2), in the Medway local authority area, South East. Show ME2 3HB on a map.
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What happens if Sentinel Auto Security Ltd files late
If the accounts reach Companies House today, the late filing penalty is £750 (£1,500 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 Jul 2026 to 31 Jul 2026 | £150 |
| 1 to 3 months late | 1 Aug 2026 to 30 Sep 2026 | £375 |
| 3 to 6 months late | 1 Oct 2026 to 31 Dec 2026 | £750 |
| More than 6 months late | From 1 Jan 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2026 | £200 |
| 3 months late | 30 Dec 2026 | another £200 |
| 6 months late | 30 Mar 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 15172795
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 September 2023 (3 years ago)
- Registered office
- 115 Weston Road, Rochester, ME2 3HB
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2024
- Last confirmation statement
- 8 September 2026
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Rochester
Other active electrical contractors registered in Rochester.
- Shan C Renewables Limited2025
- Sheriff Locks Ltd.2015
- Simply Electrical and Renewables Ltd2025
- SJ Sparks Ltd2026
- Smile Electrical Ltd2020
- South East Solar and Electrical Limited2014
- Space Electrical Management Ltd2011
- ST-Electrical Installations Ltd2022
All electrical contractors in Rochester · All trades in Rochester · Electricians across the UK
Frequently asked questions
When are Sentinel Auto Security Ltd's accounts due?
Sentinel Auto Security Ltd's accounts were due at Companies House on 30 June 2026 and the register shows them as overdue.
When is Sentinel Auto Security Ltd's CT600 due?
The CT600 for the period to 30 September 2025 is due at HMRC by 30 September 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2026.
Is Sentinel Auto Security Ltd still trading?
Sentinel Auto Security Ltd is listed as active on the Companies House register (checked 12 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 Sentinel Auto Security Ltd do?
Sentinel Auto Security Ltd is registered under Electrical installation (SIC 43210).
How old is Sentinel Auto Security Ltd?
Sentinel Auto Security Ltd was incorporated on 28 September 2023, 3 years ago.
What is the penalty if Sentinel Auto Security 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 Sentinel Auto Security Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.