- Companies
- Specialist contractors
- London
- Undertow Construction Ltd
Undertow Construction Ltd
- Company number
- 16513535
- Incorporated
- 12 Jun 20251 year trading
- Registered office
- 199 Denton Malden Crescent, London, Kent, NW1 8BS
- Nature of business
- Other specialised construction activities n.e.c.
Undertow Construction Ltd is a 1-year-old private limited company registered in London, company number 16513535, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 12 March 2027, and its first CT600 is due at HMRC on 11 June 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 Undertow Construction Ltd is registered
The registered office is in London (NW1), in the Camden local authority area, London. Show NW1 8BS on a map.
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What happens if Undertow Construction 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 12 March 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 13 Mar 2027 to 12 Apr 2027 | £150 |
| 1 to 3 months late | 13 Apr 2027 to 12 Jun 2027 | £375 |
| 3 to 6 months late | 13 Jun 2027 to 12 Sep 2027 | £750 |
| More than 6 months late | From 13 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2027 | £200 |
| 3 months late | 30 Sep 2027 | another £200 |
| 6 months late | 30 Dec 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 16513535
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 June 2025 (1 year ago)
- Registered office
- 199 Denton Malden Crescent, London, Kent, NW1 8BS
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 June (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 11 June 2026
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.
Similar companies in London
Other active specialist construction companies registered in London.
- Undisputed Solutions Ltd2025
- Ung Electrical Services Limited2022
- Uniq Tiles Ltd2025
- Unique Design & Build Ltd2010
- Unique Tapers Limited2017
- United Global Construction Limited2007
- United Media (UK) Limited2002
- United Power Installations Ltd2025
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Undertow Construction Ltd's accounts due?
Undertow Construction Ltd's next accounts are due at Companies House by 12 March 2027 (in 151 days), covering the period to 30 June 2026.
When is Undertow Construction 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 11 June 2026, due by 11 June 2027, and one for the period to 30 June 2026, due by 30 June 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Undertow Construction Ltd still trading?
Undertow Construction 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 Undertow Construction Ltd do?
Undertow Construction Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Undertow Construction Ltd?
Undertow Construction Ltd was incorporated on 12 June 2025, 1 year ago.
What is the penalty if Undertow Construction 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 Undertow Construction 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.