- Company number
- 12227535
- Incorporated
- 25 Sep 20197 years trading
- Registered office
- 70 Wood Street, London, E17 3HT
- Nature of business
- Glazing
The Portland Window Company Ltd is a 7-year-old private limited company registered in London, company number 12227535, one of 307 glazing companies in London. 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 £8,100 (-25.5%) on the year before, to £24K.
- Net assets rose in 2 of 6 year-on-year comparisons on record.
- Current assets of £50K against £26K owed within a year: 1.9 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 7 years, 2020 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £24K | £50K | £26K | 2 | |
| 31 Mar 2025 | £32K | £37K | £42K | £11K | 2 |
| 31 Mar 2024 | £55K | £64K | £75K | £20K | 2 |
| 31 Mar 2023 | £13K | £41K | £43K | £31K | 2 |
| 31 Mar 2022 | £37K | £76K | £86K | £48K | 2 |
| 31 Mar 2021 | £49K | £87K | £38K | 2 | |
| 31 Mar 2020 | £13K | £32K | £19K | 0 |
Where The Portland Window Company Ltd is registered
The registered office is in London (E17), in the Waltham Forest local authority area, London. Show E17 3HT on a map.
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Shared registered office
32 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if The Portland Window Company 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 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
- 12227535
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 September 2019 (7 years ago)
- Registered office
- 70 Wood Street, London, E17 3HT
- Nature of business
- Glazing (SIC 43342)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 24 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 London
Other active glazing companies registered in London.
- The Shopfronts and Shutters Company Ltd2022
- Thermal Glazing Limited2021
- Thornswift Limited1987
- Top Glass & Glazing Ltd2024
- Top Glazier Splashbacks and Worktops Ltd2015
- Total Installers Ltd2015
- Tristar Windows Limited2011
- TS Windows Ltd2021
All glazing companies in London · All trades in London · Glaziers across the UK
Frequently asked questions
When are The Portland Window Company Ltd's accounts due?
The Portland Window Company Ltd's next accounts are due at Companies House by 31 December 2027 (in 443 days), covering the period to 31 March 2027.
When is The Portland Window Company Ltd'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 The Portland Window Company Ltd still trading?
The Portland Window Company 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 The Portland Window Company Ltd do?
The Portland Window Company Ltd is registered under Glazing (SIC 43342).
How old is The Portland Window Company Ltd?
The Portland Window Company Ltd was incorporated on 25 September 2019, 7 years ago.
What is the penalty if The Portland Window Company 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 The Portland Window Company 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.