- Company number
- 09532416
- Incorporated
- 9 Apr 201511 years trading
- Registered office
- 40 Dawes Moor Close, Wexham, Slough, Berkshire, SL2 5RN
- Nature of business
- Glazing
S O'Connor Windows Limited is a 11-year-old private limited company registered in Slough, company number 09532416, one of 44 glazing companies in Slough. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets down £186 (-1.7%) on the year before, to £11K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £14K against £3,604 owed within a year: 3.9 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £11K | £6,693 | £14K | £3,604 | 0 |
| 31 Mar 2025 | £11K | £6,814 | £13K | £2,523 | 0 |
| 31 Mar 2024 | £17K | £12K | £4,305 | 1 | |
| 31 Mar 2023 | £24K | £21K | £2,585 | 1 | |
| 31 Dec 2021 | £21K | £24K | £2,547 | 1 | |
| 31 Dec 2020 | £8,288 | £22K | £22K | £2,801 | 0 |
| 31 Dec 2019 | -£4,982 | £20K | £19K | £1,856 | 1 |
| 31 Dec 2018 | -£5,042 | £21K | £27K | ||
| 31 Dec 2017 | -£1,882 | £29K | £29K | £32K | 1 |
| 31 Dec 2016 | -£4,238 | £9,978 | £23K | £28K | 1 |
Where S O'Connor Windows Limited is registered
The registered office is in Slough (SL2), in the Slough local authority area, South East. Show SL2 5RN on a map.
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What happens if S O'Connor 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 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
- 09532416
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 April 2015 (11 years ago)
- Registered office
- 40 Dawes Moor Close, Wexham, Slough, Berkshire, SL2 5RN
- Nature of business
- Glazing (SIC 43342)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 30 September 2025
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 Slough
Other active glazing companies registered in Slough.
- S&K Double Glazing Ltd2023
- Ses Bifold Ltd2019
- Styllish Windows Ltd.2017
- The Glass Guys Ltd2026
- Tops Glazing Ltd2019
- Urban Doors&Window Glazing Ltd2025
- A Class Windows & Doors Ltd2023
- A1 Windows Berkshire Limited2024
All glazing companies in Slough · All trades in Slough · Glaziers across the UK
Frequently asked questions
When are S O'Connor Windows Limited's accounts due?
S O'Connor Windows Limited's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is S O'Connor Windows Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is S O'Connor Windows Limited still trading?
S O'Connor 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 S O'Connor Windows Limited do?
S O'Connor Windows Limited is registered under Glazing (SIC 43342).
How old is S O'Connor Windows Limited?
S O'Connor Windows Limited was incorporated on 9 April 2015, 11 years ago.
What is the penalty if S O'Connor 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 S O'Connor 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.