- Companies
- Civil engineering
- Barnet
- TJM Sig Limited
TJM Sig Limited
- Company number
- 16231163
- Incorporated
- 5 Feb 20251 year trading
- Registered office
- 35 Eastham Close, Barnet, EN5 2XA
- Nature of business
- Construction of railways and underground railways
TJM Sig Limited is a 1-year-old private limited company registered in Barnet, company number 16231163, one of 32 civil engineering contractors in Barnet. Its next accounts are due at Companies House on 5 November 2026, and its first CT600 is due at HMRC on 4 February 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 TJM Sig Limited is registered
The registered office is in Barnet (EN5), in the Barnet local authority area, London. Show EN5 2XA on a map.
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What happens if TJM Sig 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 5 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 6 Nov 2026 to 5 Dec 2026 | £150 |
| 1 to 3 months late | 6 Dec 2026 to 5 Feb 2027 | £375 |
| 3 to 6 months late | 6 Feb 2027 to 5 May 2027 | £750 |
| More than 6 months late | From 6 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 16231163
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 February 2025 (1 year ago)
- Registered office
- 35 Eastham Close, Barnet, EN5 2XA
- Nature of business
- Construction of railways and underground railways (SIC 42120)
- Year end
- 28 February (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 4 February 2026
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 Barnet
Other active civil engineering contractors registered in Barnet.
- Turay Engineering Ltd2016
- U&M Basements Ltd1994
- Underpin & Makegood (Contracting) Limited1977
- Utilities Projects Limited2024
- Z B Utilities Ltd2019
- Andrews and Dickens Limited1993
- Barnet Water Services Ltd2026
- C A Builders Ltd2022
All civil engineering contractors in Barnet · All trades in Barnet · Civil engineering across the UK
Frequently asked questions
When are TJM Sig Limited's accounts due?
TJM Sig Limited's next accounts are due at Companies House by 5 November 2026 (in 23 days), covering the period to 28 February 2026.
When is TJM Sig 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 4 February 2026, due by 4 February 2027, and one for the period to 28 February 2026, due by 28 February 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is TJM Sig Limited still trading?
TJM Sig 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 TJM Sig Limited do?
TJM Sig Limited is registered under Construction of railways and underground railways (SIC 42120).
How old is TJM Sig Limited?
TJM Sig Limited was incorporated on 5 February 2025, 1 year ago.
What is the penalty if TJM Sig 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 TJM Sig 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.