- Companies
- Specialist contractors
- London
- Reinforced Security South London Limited
Reinforced Security South London Limited
- Company number
- 16977132
- Incorporated
- 21 Jan 2026
- Registered office
- Regent House, 316A, Beulah Hill, London, SE19 3HF
- Nature of business
- Other specialised construction activities n.e.c.
Reinforced Security South London Limited is a newly incorporated private limited company registered in London, company number 16977132, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 21 October 2027, and its first CT600 is due at HMRC on 20 January 2028.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Reinforced Security South London Limited is registered
The registered office is in London (SE19), in the Croydon local authority area, London. Show SE19 3HF on a map.
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Also registered at this address
3 other companies use the same registered office as Reinforced Security South London Limited.
- Apex Flow and Crush LimitedMachinery repair and installation
- Blackwater Fire Protection LimitedSpecialist contractors
- D&L Data Service LtdElectricians
What happens if Reinforced Security South London 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 21 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 22 Oct 2027 to 21 Nov 2027 | £150 |
| 1 to 3 months late | 22 Nov 2027 to 21 Jan 2028 | £375 |
| 3 to 6 months late | 22 Jan 2028 to 21 Apr 2028 | £750 |
| More than 6 months late | From 22 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2028 | £200 |
| 3 months late | 30 Apr 2028 | another £200 |
| 6 months late | 31 Jul 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 2029 | 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
- 16977132
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 January 2026
- Registered office
- Regent House, 316A, Beulah Hill, London, SE19 3HF
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
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- Relinecommercial Ltd2022
- Relm Interiors Limited2015
- Remodel IT Ltd2021
- Renco Renovations Ltd2021
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Frequently asked questions
When are Reinforced Security South London Limited's accounts due?
Reinforced Security South London Limited's next accounts are due at Companies House by 21 October 2027 (in 373 days), covering the period to 31 January 2027.
When is Reinforced Security South London Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 20 January 2027, due by 20 January 2028, and one for the period to 31 January 2027, due by 31 January 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Reinforced Security South London Limited still trading?
Reinforced Security South London 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 Reinforced Security South London Limited do?
Reinforced Security South London Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Reinforced Security South London Limited?
Reinforced Security South London Limited was incorporated on 21 January 2026, less than a year ago.
What is the penalty if Reinforced Security South London 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 Reinforced Security South London 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.