Argon Windows and Doors Ltd
- Company number
- 12454840
- Incorporated
- 11 Feb 20206 years trading
- Registered office
- Unit 11 Cherry Park Industrial Estate, Cambridge Road, Melbourn, Hertfordshire, SG8 6EY
- Nature of business
- Glazing
Argon Windows and Doors Ltd is a 6-year-old private limited company registered in Melbourn, company number 12454840, one of the UK's glazing companies. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 £18K (-66.9%) on the year before, to £9,117.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £68K against £64K owed within a year: 1.1 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 28 Feb 2025 | £9,117 | £68K | £64K | 3 | |
| 29 Feb 2024 | £28K | £19K | £45K | 3 | |
| 28 Feb 2023 | £21K | £30K | £45K | 3 | |
| 28 Feb 2022 | £18K | £13K | £38K | 2 | |
| 28 Feb 2021 | £8,179 | £22K | £22K | 0 |
Where Argon Windows and Doors Ltd is registered
The registered office is in Melbourn (SG8), in the South Cambridgeshire local authority area, East of England. Show SG8 6EY on a map.
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What happens if Argon Windows and Doors 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 12454840
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 February 2020 (6 years ago)
- Registered office
- Unit 11 Cherry Park Industrial Estate, Cambridge Road, Melbourn, Hertfordshire, SG8 6EY
- Nature of business
- Glazing (SIC 43342)
- Year end
- 29 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 19 January 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
Other active glazing companies.
Frequently asked questions
When are Argon Windows and Doors Ltd's accounts due?
Argon Windows and Doors Ltd's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Argon Windows and Doors Ltd's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Argon Windows and Doors Ltd still trading?
Argon Windows and Doors 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 Argon Windows and Doors Ltd do?
Argon Windows and Doors Ltd is registered under Glazing (SIC 43342).
How old is Argon Windows and Doors Ltd?
Argon Windows and Doors Ltd was incorporated on 11 February 2020, 6 years ago.
What is the penalty if Argon Windows and Doors 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 Argon Windows and Doors 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.