- Company number
- 04855552
- Incorporated
- 4 Aug 200323 years trading
- Registered office
- 3 High Street, Iver, Buckinghamshire, SL0 9ND
- Nature of business
- Glazing
Alpha Windows (Berkshire) Ltd is a 23-year-old private limited company registered in Iver, company number 04855552, one of the UK's glazing companies. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 2027.
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 £37K (-109.3%) on the year before, to -£3,158.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £111K against £113K owed within a year: 1.0 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | -£3,158 | £17K | £111K | £113K | 2 |
| 31 Dec 2024 | £34K | £57K | £122K | £99K | 2 |
| 31 Dec 2023 | £43K | £65K | £192K | £136K | 3 |
| 31 Dec 2022 | £105K | £74K | £295K | £174K | 3 |
| 31 Dec 2021 | £92K | £50K | £258K | £138K | 4 |
| 31 Dec 2020 | £54K | £233K | £595K | £510K | 4 |
| 31 Dec 2019 | £110K | £43K | £260K | £180K | 5 |
| 31 Dec 2018 | £125K | £88K | £242K | £129K | |
| 31 Dec 2017 | £150K | £47K | £287K | £142K | 6 |
| 31 Dec 2016 | £122K | £91K | £263K | £147K | 4 |
Who runs and owns Alpha Windows (Berkshire) Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| D*** C*** | Director | Aug 2003 |
3 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| R*** C*** | Secretary | Aug 2003 | Jul 2014 |
| Swift Incorporations Limited | Corporate Nominee Secretary | Aug 2003 | Aug 2003 |
| Instant Companies Limited | Nominee director (company) | Aug 2003 | Aug 2003 |
People with significant control (2)
Charges (secured borrowing)
1 of 1 registered charge is outstanding. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| Slough Trading Estate Limited | Outstanding | Jan 2007 |
Where Alpha Windows (Berkshire) Ltd is registered
The registered office is in Iver (SL0), in the Buckinghamshire local authority area, South East. Show SL0 9ND on a map.
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Also registered at this address
1 other company uses the same registered office as Alpha Windows (Berkshire) Ltd.
- Crisp Homes LtdBuilders
What happens if Alpha Windows (Berkshire) 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 04855552
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 August 2003 (23 years ago)
- Registered office
- 3 High Street, Iver, Buckinghamshire, SL0 9ND
- Nature of business
- Glazing (SIC 43342)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 30 September 2025
- Charges (mortgages)
- 1 outstanding of 1 registered
- Previous names
- Crisp Developments Limited (until 18 Feb 2008)
The Door & Window Store Limited (until 19 Jun 2007)
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 Iver
Other active glazing companies registered in Iver.
All glazing companies in Iver · All trades in Iver · Glaziers across the UK
Frequently asked questions
When are Alpha Windows (Berkshire) Ltd's accounts due?
Alpha Windows (Berkshire) Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Alpha Windows (Berkshire) Ltd's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Alpha Windows (Berkshire) Ltd still trading?
Alpha Windows (Berkshire) 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 Alpha Windows (Berkshire) Ltd do?
Alpha Windows (Berkshire) Ltd is registered under Glazing (SIC 43342).
How old is Alpha Windows (Berkshire) Ltd?
Alpha Windows (Berkshire) Ltd was incorporated on 4 August 2003, 23 years ago.
Who runs Alpha Windows (Berkshire) Ltd?
Alpha Windows (Berkshire) Ltd has 1 active director, the longest-serving appointed in Aug 2003. Their names and service addresses are on the Companies House register.
Who owns Alpha Windows (Berkshire) Ltd?
2 people or companies have significant control of Alpha Windows (Berkshire) Ltd: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if Alpha Windows (Berkshire) 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 Alpha Windows (Berkshire) 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.