- Companies
- Property developers
- Alnwick
- Northern Fortress Limited
Northern Fortress Limited
- Company number
- 11930410
- Incorporated
- 8 Apr 20197 years trading
- Registered office
- The Estates Office, Alnwick Castle, Alnwick, Northumberland, NE66 1NQ
- Nature of business
- Development of building projects; Activities of open-ended investment companies; Buying and selling of own real estate
Northern Fortress Limited is a 7-year-old private limited company registered in Alnwick, company number 11930410, one of 21 property development companies in Alnwick. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Where Northern Fortress Limited is registered
The registered office is in Alnwick (NE66), in the Northumberland local authority area, North East. Show NE66 1NQ on a map.
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What happens if Northern Fortress 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 11930410
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 April 2019 (7 years ago)
- Registered office
- The Estates Office, Alnwick Castle, Alnwick, Northumberland, NE66 1NQ
- Nature of business
- Development of building projects (SIC 41100)
Activities of open-ended investment companies (SIC 64304)
Buying and selling of own real estate (SIC 68100) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 7 April 2026
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Alnwick
Other active property development companies registered in Alnwick.
- Northumberland Management Services Limited2020
- P. Dawson Developments Limited2010
- Paul Foster Stonemason & Builder Limited2019
- Teasdale Properties (Ne) Limited2022
- True North Real Asset Partners Limited2004
- Vision Developments Limited1992
- Aps (UK) Limited2011
- Argyle Planning Consultancy Ltd2010
All property development companies in Alnwick · All trades in Alnwick · Property developers across the UK
Frequently asked questions
When are Northern Fortress Limited's accounts due?
Northern Fortress Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Northern Fortress Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Northern Fortress Limited still trading?
Northern Fortress 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 Northern Fortress Limited do?
Northern Fortress Limited is registered under Development of building projects (SIC 41100); Activities of open-ended investment companies (SIC 64304); Buying and selling of own real estate (SIC 68100).
How old is Northern Fortress Limited?
Northern Fortress Limited was incorporated on 8 April 2019, 7 years ago.
What is the penalty if Northern Fortress 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 Northern Fortress 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.