- Companies
- Civil engineering
- Belfast
- J L Armstrong & Sons Ltd
J L Armstrong & Sons Ltd
- Company number
- NI739450
- Incorporated
- 1 Apr 2026
- Registered office
- Office 1 Townsend Enterprise Park, 28 Townsend Street, Belfast, BT13 2ES
- Nature of business
- Construction of utility projects for electricity and telecommunications
J L Armstrong & Sons Ltd is a newly incorporated private limited company registered in Belfast, company number NI739450, one of 67 civil engineering contractors in Belfast. Its next accounts are due at Companies House on 1 January 2028, and its first CT600 is due at HMRC on 31 March 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 J L Armstrong & Sons Ltd is registered
The registered office is in Belfast (BT13), in the Belfast local authority area, Northern Ireland. Show BT13 2ES on a map.
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Also registered at this address
9 other companies use the same registered office as J L Armstrong & Sons Ltd.
- A D Contracts (2026) LtdInstallers
- Aghalee Design Services LtdBuilders
- Alia Properties Belfast LtdProperty developers
- Autoglaze (2026) LtdMechanics and garages
- BSF (N.I.) LtdFinishing trades
- P & M Construction LtdBuilders
- PRL Northern Motors LtdMotor traders
- Seapark Construction (2026) LtdBuilders
- Trainor Electrical Contracts LtdElectricians
What happens if J L Armstrong & Sons 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 1 January 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 2 Jan 2028 to 1 Feb 2028 | £150 |
| 1 to 3 months late | 2 Feb 2028 to 1 Apr 2028 | £375 |
| 3 to 6 months late | 2 Apr 2028 to 1 Jul 2028 | £750 |
| More than 6 months late | From 2 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2028 | £200 |
| 3 months late | 30 Jul 2028 | another £200 |
| 6 months late | 30 Oct 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- NI739450
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 April 2026
- Registered office
- Office 1 Townsend Enterprise Park, 28 Townsend Street, Belfast, BT13 2ES
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 30 April (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 Belfast
Other active civil engineering contractors registered in Belfast.
- J P Contracts (2023) Ltd2023
- J&L Formwork Ltd2021
- J. Ballantine Surfacing Ltd2011
- JMG Contracts Ltd2016
- Joma Tunneling Ltd2026
- Lagan Specialist International Limited2026
- Lappin Construction (NI) Limited2011
- LMB Utilities Ltd2026
All civil engineering contractors in Belfast · All trades in Belfast · Civil engineering across the UK
Frequently asked questions
When are J L Armstrong & Sons Ltd's accounts due?
J L Armstrong & Sons Ltd's next accounts are due at Companies House by 1 January 2028 (in 445 days), covering the period to 30 April 2027.
When is J L Armstrong & Sons 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 31 March 2027, due by 31 March 2028, and one for the period to 30 April 2027, due by 30 April 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is J L Armstrong & Sons Ltd still trading?
J L Armstrong & Sons 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 J L Armstrong & Sons Ltd do?
J L Armstrong & Sons Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is J L Armstrong & Sons Ltd?
J L Armstrong & Sons Ltd was incorporated on 1 April 2026, less than a year ago.
What is the penalty if J L Armstrong & Sons 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 J L Armstrong & Sons 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.