- Company number
- 15935064
- Incorporated
- 4 Sep 20242 years trading
- Registered office
- Unit 4, Kelpatrick Road, Slough, SL1 6BW
- Nature of business
- Glazing; Other retail sale in non-specialised stores
A1 Windows Berkshire Limited is a 2-year-old private limited company registered in Slough, company number 15935064, one of 44 glazing companies in Slough. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 30 September 2025, as filed at Companies House. Negative net assets mean the company owed more than it owned at that date.
Where A1 Windows Berkshire Limited is registered
The registered office is in Slough (SL1), in the Slough local authority area, South East. Show SL1 6BW on a map.
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What happens if A1 Windows Berkshire 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2028 | 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
- 15935064
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 September 2024 (2 years ago)
- Registered office
- Unit 4, Kelpatrick Road, Slough, SL1 6BW
- Nature of business
- Glazing (SIC 43342)
Other retail sale in non-specialised stores (SIC 47190) - Year end
- 30 September (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 27 August 2026
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.
- Air Seal Glazing Limited2010
- Andrew Tansley Limited2012
- Ap Windows Glazing Ltd2023
- Ask Services (UK) Ltd2003
- Bespoke Timber Look Windows Ltd2024
- Brahamdoors Ltd2024
- Brahm Glazing Ltd2025
- Dimpy Constructions & Double Glazing Ltd2023
All glazing companies in Slough · All trades in Slough · Glaziers across the UK
Frequently asked questions
When are A1 Windows Berkshire Limited's accounts due?
A1 Windows Berkshire Limited's next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is A1 Windows Berkshire Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is A1 Windows Berkshire Limited still trading?
A1 Windows Berkshire 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 A1 Windows Berkshire Limited do?
A1 Windows Berkshire Limited is registered under Glazing (SIC 43342); Other retail sale in non-specialised stores (SIC 47190).
How old is A1 Windows Berkshire Limited?
A1 Windows Berkshire Limited was incorporated on 4 September 2024, 2 years ago.
What is the penalty if A1 Windows Berkshire 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 A1 Windows Berkshire 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.