- Company number
- 17106830
- Incorporated
- 20 Mar 2026
- Registered office
- 135 Green Lane, Ilford, IG1 1XW
- Nature of business
- Glazing
SJ Protect Windows Limited is a newly incorporated private limited company registered in Ilford, company number 17106830, one of 53 glazing companies in Ilford. Its next accounts are due at Companies House on 20 December 2027, and its first CT600 is due at HMRC on 19 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.
Is this your company?
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Where SJ Protect Windows Limited is registered
The registered office is in Ilford (IG1), in the Redbridge local authority area, London. Show IG1 1XW on a map.
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What happens if SJ Protect Windows 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 20 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 21 Dec 2027 to 20 Jan 2028 | £150 |
| 1 to 3 months late | 21 Jan 2028 to 20 Mar 2028 | £375 |
| 3 to 6 months late | 21 Mar 2028 to 20 Jun 2028 | £750 |
| More than 6 months late | From 21 Jun 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 17106830
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 March 2026
- Registered office
- 135 Green Lane, Ilford, IG1 1XW
- Nature of business
- Glazing (SIC 43342)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for glazing companies
Glazing companies often take deposits before work starts. Deposits held at the year end are a liability, not income, until the job is done.
Similar companies in Ilford
Other active glazing companies registered in Ilford.
- SK Double Glazing Ltd2014
- Skylight Double Glazing Limited2004
- Skylight Glazing Ltd2018
- Spilujr Ltd2026
- Sterling Double Glazing Ltd2025
- The London Splashbacks Co Ltd2014
- The Majestic Glass Company Ltd2016
- Vinos Glass Ltd2018
All glazing companies in Ilford · All trades in Ilford · Glaziers across the UK
Frequently asked questions
When are SJ Protect Windows Limited's accounts due?
SJ Protect Windows Limited's next accounts are due at Companies House by 20 December 2027 (in 433 days), covering the period to 31 March 2027.
When is SJ Protect Windows Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 19 March 2027, due by 19 March 2028, and one for the period to 31 March 2027, due by 31 March 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is SJ Protect Windows Limited still trading?
SJ Protect Windows 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 SJ Protect Windows Limited do?
SJ Protect Windows Limited is registered under Glazing (SIC 43342).
How old is SJ Protect Windows Limited?
SJ Protect Windows Limited was incorporated on 20 March 2026, less than a year ago.
What is the penalty if SJ Protect Windows 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 SJ Protect Windows 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.