- Companies
- Civil engineering
- London
- CM Site Engineering Ltd
CM Site Engineering Ltd
- Company number
- 16944453
- Incorporated
- 5 Jan 2026
- Registered office
- 109 Argento Tower, Mapleton Road, London, SW18 4GB
- Nature of business
- Construction of other civil engineering projects n.e.c.
CM Site Engineering Ltd is a newly incorporated private limited company registered in London, company number 16944453, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 5 October 2027, and its first CT600 is due at HMRC on 4 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 CM Site Engineering Ltd is registered
The registered office is in London (SW18), in the Wandsworth local authority area, London. Show SW18 4GB on a map.
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What happens if CM Site Engineering 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 5 October 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 6 Oct 2027 to 5 Nov 2027 | £150 |
| 1 to 3 months late | 6 Nov 2027 to 5 Jan 2028 | £375 |
| 3 to 6 months late | 6 Jan 2028 to 5 Apr 2028 | £750 |
| More than 6 months late | From 6 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
- 16944453
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 January 2026
- Registered office
- 109 Argento Tower, Mapleton Road, London, SW18 4GB
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 January (accounting reference date)
- Accounts type
- No accounts filed yet
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 London
Other active civil engineering contractors registered in London.
- Cmackg Ltd2025
- CMB Logistics and Traffic Management Ltd2025
- Cni Services Limited2023
- CNMS Construction Ltd2021
- CNR International Ltd2020
- Cobaltt Construction Ltd2019
- Cobomech UK Ltd2026
- Cohere Network and Engineering Solution Limited2022
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are CM Site Engineering Ltd's accounts due?
CM Site Engineering Ltd's next accounts are due at Companies House by 5 October 2027 (in 358 days), covering the period to 31 January 2027.
When is CM Site Engineering Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 4 January 2027, due by 4 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 CM Site Engineering Ltd still trading?
CM Site Engineering 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 CM Site Engineering Ltd do?
CM Site Engineering Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is CM Site Engineering Ltd?
CM Site Engineering Ltd was incorporated on 5 January 2026, less than a year ago.
What is the penalty if CM Site Engineering 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 CM Site Engineering 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.