- Companies
- Property developers
- London
- CSMB Limited
CSMB Limited
- Company number
- 16338720
- Incorporated
- 24 Mar 20251 year trading
- Registered office
- Flat 2, 143 Argyle Road, London, W13 0DB
- Nature of business
- Development of building projects; Construction of domestic buildings; General cleaning of buildings
CSMB Limited is a 1-year-old private limited company registered in London, company number 16338720, one of 14,100 property development companies in London. Its next accounts are due at Companies House on 24 December 2026, and its first CT600 is due at HMRC on 23 March 2027.
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 CSMB Limited is registered
The registered office is in London (W13), in the Ealing local authority area, London. Show W13 0DB on a map.
Other trade companies in W13
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- Jpam Plumbing Solution LtdPlumbers and heating engineers
- London’S Local Builder LtdFinishing trades
- Arman Autos LtdMotor traders
- Brush & Bolt LtdProperty developers
- Meister Cleaning LtdCleaning companies
- A Harrington LimitedMechanics and garages
- LC Cars LtdMotor traders
What happens if CSMB 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 24 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 25 Dec 2026 to 24 Jan 2027 | £150 |
| 1 to 3 months late | 25 Jan 2027 to 24 Mar 2027 | £375 |
| 3 to 6 months late | 25 Mar 2027 to 24 Jun 2027 | £750 |
| More than 6 months late | From 25 Jun 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
- 16338720
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 March 2025 (1 year ago)
- Registered office
- Flat 2, 143 Argyle Road, London, W13 0DB
- Nature of business
- Development of building projects (SIC 41100)
Construction of domestic buildings (SIC 41202)
General cleaning of buildings (SIC 81210) - Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 29 September 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 London
Other active property development companies registered in London.
- CSN Construction 4U Ltd2019
- CSW Projects Ltd2026
- CT Brickwork Ltd2021
- CT Building and Plastering Services Ltd2025
- CT Building Constructions Ltd2013
- Cti Integrated Global Services Ltd2025
- CTN Homes Ltd2025
- CTS UK Europe Limited2025
All property development companies in London · All trades in London · Property developers across the UK
Frequently asked questions
When are CSMB Limited's accounts due?
CSMB Limited's next accounts are due at Companies House by 24 December 2026 (in 73 days), covering the period to 31 March 2026.
When is CSMB 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 23 March 2026, due by 23 March 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is CSMB Limited still trading?
CSMB 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 CSMB Limited do?
CSMB Limited is registered under Development of building projects (SIC 41100); Construction of domestic buildings (SIC 41202); General cleaning of buildings (SIC 81210).
How old is CSMB Limited?
CSMB Limited was incorporated on 24 March 2025, 1 year ago.
What is the penalty if CSMB 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 CSMB 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.