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- Seamark Technical Solutions Ltd
Company profile · Civil engineering
Seamark Technical Solutions Ltd
Seamark Technical Solutions Ltd is a newly incorporated private limited company registered in Northampton, company number 16963947, one of 152 civil engineering contractors in Northampton. Its next accounts are due at Companies House on 30 June 2027, and its first CT600 is due at HMRC on 13 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 Seamark Technical Solutions Ltd is registered
The registered office is in Northampton (NN3), in the West Northamptonshire local authority area, East Midlands. Show NN3 5EW on a map.
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What happens if Seamark Technical Solutions 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2028 | £200 |
| 3 months late | 30 Dec 2028 | another £200 |
| 6 months late | 30 Mar 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 16963947
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 January 2026
- Registered office
- 7 Parkside, Northampton, NN3 5EW
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Electrical installation (SIC 43210) - Year end
- 30 September (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 Northampton
Other active civil engineering contractors registered in Northampton.
- Semilong Services Limited2009
- SF Management & Maintenance Ltd2021
- Shortland Construction Limited2004
- Signature Surfaces Northants Ltd2026
- Simo Groupwork Ltd2025
- Simply Commspace Limited2025
- SM Project Management Services Ltd2017
- SMH Civils Limited2021
All civil engineering contractors in Northampton · All trades in Northampton · Civil engineering across the UK
Frequently asked questions
When are Seamark Technical Solutions Ltd's accounts due?
Seamark Technical Solutions Ltd's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2027.
When is Seamark Technical Solutions 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 13 January 2027, due by 13 January 2028, and one for the period to 30 September 2027, due by 30 September 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Seamark Technical Solutions Ltd still trading?
Seamark Technical Solutions 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 Seamark Technical Solutions Ltd do?
Seamark Technical Solutions Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Electrical installation (SIC 43210).
How old is Seamark Technical Solutions Ltd?
Seamark Technical Solutions Ltd was incorporated on 14 January 2026, less than a year ago.
What is the penalty if Seamark Technical Solutions 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 Seamark Technical Solutions 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.