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- STX Insulation Ltd
Company profile · Installers
STX Insulation Ltd
STX Insulation Ltd is a newly incorporated private limited company registered in Berwick-upon-Tweed, company number SC895063, one of the UK's installation companies (insulation, lifts, shutters and similar). Its next accounts are due at Companies House on 6 April 2028, and its first CT600 is due at HMRC on 5 July 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 STX Insulation Ltd is registered
The registered office is in Berwick-upon-Tweed (TD15), in the Northumberland local authority area, North East. Show TD15 1LF on a map.
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What happens if STX Insulation 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 6 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 7 Apr 2028 to 6 May 2028 | £150 |
| 1 to 3 months late | 7 May 2028 to 6 Jul 2028 | £375 |
| 3 to 6 months late | 7 Jul 2028 to 6 Oct 2028 | £750 |
| More than 6 months late | From 7 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2028 | £200 |
| 3 months late | 31 Oct 2028 | another £200 |
| 6 months late | 31 Jan 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- SC895063
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 July 2026
- Registered office
- 71 Castlegate, Berwick-upon-Tweed, TD15 1LF
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Berwick-upon-Tweed
Other active installation companies (insulation, lifts, shutters and similar) registered in Berwick-upon-Tweed.
All installation companies (insulation, lifts, shutters and similar) in Berwick-upon-Tweed · All trades in Berwick-upon-Tweed · Installers across the UK
Frequently asked questions
When are STX Insulation Ltd's accounts due?
STX Insulation Ltd's next accounts are due at Companies House by 6 April 2028 (in 542 days), covering the period to 31 July 2027.
When is STX Insulation 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 5 July 2027, due by 5 July 2028, and one for the period to 31 July 2027, due by 31 July 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is STX Insulation Ltd still trading?
STX Insulation 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 STX Insulation Ltd do?
STX Insulation Ltd is registered under Other construction installation (SIC 43290).
How old is STX Insulation Ltd?
STX Insulation Ltd was incorporated on 6 July 2026, less than a year ago.
What is the penalty if STX Insulation 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 STX Insulation 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.