- Companies
- Builders
- Northampton
- Castle Construction Group Ltd
Castle Construction Group Ltd
- Company number
- 16929121
- Incorporated
- 23 Dec 2025
- Registered office
- 14 Fitzsewin Court, Upton, Northampton, NN5 4GW
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings; Other construction installation
Castle Construction Group Ltd is a newly incorporated private limited company registered in Northampton, company number 16929121, one of 586 building contractors in Northampton. Its next accounts are due at Companies House on 23 September 2027, and its first CT600 is due at HMRC on 22 December 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 Castle Construction Group Ltd is registered
The registered office is in Northampton (NN5), in the West Northamptonshire local authority area, East Midlands. Show NN5 4GW on a map.
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What happens if Castle Construction Group 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 23 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 24 Sep 2027 to 23 Oct 2027 | £150 |
| 1 to 3 months late | 24 Oct 2027 to 23 Dec 2027 | £375 |
| 3 to 6 months late | 24 Dec 2027 to 23 Mar 2028 | £750 |
| More than 6 months late | From 24 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 16929121
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 December 2025
- Registered office
- 14 Fitzsewin Court, Upton, Northampton, NN5 4GW
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202)
Other construction installation (SIC 43290) - Year end
- 31 December (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Northampton
Other active building contractors registered in Northampton.
- Cavaedium Ltd2024
- Cba Construction Ltd2025
- Cbi Construct Ltd2023
- CBS Building (Midlands) Ltd2024
- Ceban Solutions Limited2026
- Cepo Construction Ltd2021
- Ceramilux Construct Limited2026
- CGM Building Contractor Ltd2017
All building contractors in Northampton · All trades in Northampton · Builders across the UK
Frequently asked questions
When are Castle Construction Group Ltd's accounts due?
Castle Construction Group Ltd's next accounts are due at Companies House by 23 September 2027 (in 345 days), covering the period to 31 December 2026.
When is Castle Construction Group 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 22 December 2026, due by 22 December 2027, and one for the period to 31 December 2026, due by 31 December 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Castle Construction Group Ltd still trading?
Castle Construction Group 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 Castle Construction Group Ltd do?
Castle Construction Group Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202); Other construction installation (SIC 43290).
How old is Castle Construction Group Ltd?
Castle Construction Group Ltd was incorporated on 23 December 2025, less than a year ago.
What is the penalty if Castle Construction Group 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 Castle Construction Group 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.