- Companies
- Civil engineering
- Middlesbrough
- Sep Monitoring & Civils Ltd
Sep Monitoring & Civils Ltd
- Company number
- 16581880
- Incorporated
- 15 Jul 20251 year trading
- Registered office
- Unit E2, Commerce Way, Middlesbrough, TS6 6UR
- Nature of business
- Construction of other civil engineering projects n.e.c.
Sep Monitoring & Civils Ltd is a 1-year-old private limited company registered in Middlesbrough, company number 16581880, one of 101 civil engineering contractors in Middlesbrough. Its next accounts are due at Companies House on 15 April 2027, and its first CT600 is due at HMRC on 14 July 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 Sep Monitoring & Civils Ltd is registered
The registered office is in Middlesbrough (TS6), in the Redcar and Cleveland local authority area, North East. Show TS6 6UR on a map.
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Also registered at this address
1 other company uses the same registered office as Sep Monitoring & Civils Ltd.
- Sep Infrastructure LtdCivil engineering
What happens if Sep Monitoring & Civils 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 15 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 16 Apr 2027 to 15 May 2027 | £150 |
| 1 to 3 months late | 16 May 2027 to 15 Jul 2027 | £375 |
| 3 to 6 months late | 16 Jul 2027 to 15 Oct 2027 | £750 |
| More than 6 months late | From 16 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 16581880
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 July 2025 (1 year ago)
- Registered office
- Unit E2, Commerce Way, Middlesbrough, TS6 6UR
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 14 July 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 Middlesbrough
Other active civil engineering contractors registered in Middlesbrough.
- Signal Tech Limited2022
- SJ MC Ltd2019
- Solm Services Ltd2022
- SPD Renewable Solutions Ltd2025
- T Foster Engineering Limited2009
- Tees Rail & Civils Ltd2022
- Teeside Turbines Ltd2026
- Teesside Industrial Services Ltd2026
All civil engineering contractors in Middlesbrough · All trades in Middlesbrough · Civil engineering across the UK
Frequently asked questions
When are Sep Monitoring & Civils Ltd's accounts due?
Sep Monitoring & Civils Ltd's next accounts are due at Companies House by 15 April 2027 (in 184 days), covering the period to 31 July 2026.
When is Sep Monitoring & Civils 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 14 July 2026, due by 14 July 2027, and one for the period to 31 July 2026, due by 31 July 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Sep Monitoring & Civils Ltd still trading?
Sep Monitoring & Civils 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 Sep Monitoring & Civils Ltd do?
Sep Monitoring & Civils Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Sep Monitoring & Civils Ltd?
Sep Monitoring & Civils Ltd was incorporated on 15 July 2025, 1 year ago.
What is the penalty if Sep Monitoring & Civils 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 Sep Monitoring & Civils 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.