- Companies
- Electricians
- London
- Window Fit Supreme Ltd
Window Fit Supreme Ltd
- Company number
- 15353129
- Incorporated
- 15 Dec 20232 years trading
- Registered office
- Flat 3E, 579, High Road Leytonstone, London, E11 4PB
- Nature of business
- Electrical installation
Window Fit Supreme Ltd is a 2-year-old private limited company registered in London, company number 15353129, one of 3,448 electrical contractors in London. Companies House shows its accounts as overdue: they were due on 30 September 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2024
From the balance sheet at 31 December 2024, as filed at Companies House.
Where Window Fit Supreme Ltd is registered
The registered office is in London (E11), in the Waltham Forest local authority area, London. Show E11 4PB on a map.
Other trade companies in E11
- Yvt 79 LtdBuilders
- Ayadi Services LimitedPlumbers and heating engineers
- Bensliman Services LimitedPlumbers and heating engineers
- Myhomerenew Ltd LtdPlasterers
- Velaron LtdProperty developers
- Hakk Technical Services LtdInstallers
- Meycarwash LtdCleaning companies
- Rose Ave LtdProperty developers
What happens if Window Fit Supreme Ltd files late
If the accounts reach Companies House today, the late filing penalty is £150 (£300 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2026 to 31 Oct 2026 | £150 |
| 1 to 3 months late | 1 Nov 2026 to 31 Dec 2026 | £375 |
| 3 to 6 months late | 1 Jan 2027 to 31 Mar 2027 | £750 |
| More than 6 months late | From 1 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2027 | £200 |
| 3 months late | 31 Mar 2027 | another £200 |
| 6 months late | 30 Jun 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 2027 | 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
- 15353129
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 15 December 2023 (2 years ago)
- Registered office
- Flat 3E, 579, High Road Leytonstone, London, E11 4PB
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 15 September 2025
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in London
Other active electrical contractors registered in London.
- Wire & Earth Limited2026
- Wire and Net Ltd2025
- Wire IT Ltd2022
- Wired Up Electrical Solutions Limited2016
- Wise Homes Group Ltd2025
- Wiseman Electrical Services Ltd2026
- Wisetech Electrical Ltd.2025
- Wishpool Limited1999
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Window Fit Supreme Ltd's accounts due?
Window Fit Supreme Ltd's accounts were due at Companies House on 30 September 2026 and the register shows them as overdue.
When is Window Fit Supreme Ltd's CT600 due?
The CT600 for the period to 31 December 2025 is due at HMRC by 31 December 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2026.
Is Window Fit Supreme Ltd still trading?
Window Fit Supreme Ltd is listed as active on the Companies House register (checked 13 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 Window Fit Supreme Ltd do?
Window Fit Supreme Ltd is registered under Electrical installation (SIC 43210).
How old is Window Fit Supreme Ltd?
Window Fit Supreme Ltd was incorporated on 15 December 2023, 2 years ago.
What is the penalty if Window Fit Supreme 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 Window Fit Supreme Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.