- Companies
- Property developers
- Doncaster
- B21 Security Ltd
B21 Security Ltd
- Company number
- 16409411
- Incorporated
- 25 Apr 20251 year trading
- Registered office
- 34 Lockwood Road, Doncaster, DN1 2TT
- Nature of business
- Development of building projects; Agents involved in the sale of a variety of goods; Private security activities; General cleaning of buildings
B21 Security Ltd is a 1-year-old private limited company registered in Doncaster, company number 16409411, one of 323 property development companies in Doncaster. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2026
From the balance sheet at 31 March 2026, as filed at Companies House.
Where B21 Security Ltd is registered
The registered office is in Doncaster (DN1), in the Doncaster local authority area, Yorkshire and The Humber. Show DN1 2TT on a map.
Other trade companies in DN1
- Nacu Trans LtdMechanics and garages
- Highwind Developments LimitedFinishing trades
- Adzare Service LtdMechanics and garages
- Sukaj Construction LtdPlasterers
- Tobityres LimitedMechanics and garages
- Firmont Homes LtdBuilders
- Callerton Autos LtdMotor traders
- S & A Motor Vehicles LimitedMotor traders
Also registered at this address
1 other company uses the same registered office as B21 Security Ltd.
- Streama 3 LimitedCivil engineering
What happens if B21 Security 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 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16409411
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 April 2025 (1 year ago)
- Registered office
- 34 Lockwood Road, Doncaster, DN1 2TT
- Nature of business
- Development of building projects (SIC 41100)
Agents involved in the sale of a variety of goods (SIC 46190)
Private security activities (SIC 80100)
General cleaning of buildings (SIC 81210) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 27 April 2026
- Previous names
- Aa Secure Access Ltd (until 5 Sep 2025)
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Doncaster
Other active property development companies registered in Doncaster.
- Bekson Construction Ltd2021
- Belfort Investments Ltd2020
- Belgravia Property Developments Limited2023
- Belton Property Developers Limited2004
- Berand Homes Limited1977
- BFC Developments Ltd2019
- Blansco Ltd2024
- Blueprint Homes (North) Ltd2025
All property development companies in Doncaster · All trades in Doncaster · Property developers across the UK
Frequently asked questions
When are B21 Security Ltd's accounts due?
B21 Security Ltd's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is B21 Security Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is B21 Security Ltd still trading?
B21 Security 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 B21 Security Ltd do?
B21 Security Ltd is registered under Development of building projects (SIC 41100); Agents involved in the sale of a variety of goods (SIC 46190); Private security activities (SIC 80100); General cleaning of buildings (SIC 81210).
How old is B21 Security Ltd?
B21 Security Ltd was incorporated on 25 April 2025, 1 year ago.
What is the penalty if B21 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 B21 Security 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.