- Companies
- Electricians
- Bexley
- Cosyseal Windows Limited
Cosyseal Windows Limited
- Company number
- 05038490
- Incorporated
- 9 Feb 200422 years trading
- Registered office
- 13 Montpelier Avenue, Bexley, DA5 3AP
- Nature of business
- Electrical installation
Cosyseal Windows Limited is a 22-year-old private limited company registered in Bexley, company number 05038490, one of 49 electrical contractors in Bexley. 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 £29K (-14.7%) on the year before, to £170K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £189K against £29K owed within a year: 6.6 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £170K | £189K | £29K | 1 | |
| 31 Mar 2025 | £199K | £228K | £38K | 1 | |
| 31 Mar 2024 | £148K | £257K | £109K | 1 | |
| 31 Mar 2023 | £43K | £108K | £38K | 1 | |
| 31 Mar 2022 | £16K | £81K | £40K | 2 | |
| 31 Mar 2021 | £6,537 | £33K | £8,721 | 1 | |
| 31 Mar 2020 | £26K | £39K | £13K | 1 | |
| 31 Mar 2019 | £30K | £49K | £19K | ||
| 31 Mar 2018 | £1,209 | £10K | £8,002 | ||
| 31 Mar 2017 | £11K | £15K | £25K |
Where Cosyseal Windows Limited is registered
The registered office is in Bexley (DA5), in the Bexley local authority area, London. Show DA5 3AP on a map.
Other trade companies in DA5
- Homeheat+ LtdPlumbers and heating engineers
- Apex South West Construction LtdBuilders
- E & F Surfacing & Construction LtdSpecialist contractors
- T&R Cleaning Services LtdCleaning companies
- Paul C Jordan LimitedBuilders
- SX Plumbing LimitedPlumbers and heating engineers
- Rennell Interiors LtdJoiners and carpenters
- Ravenford Planning LtdProperty developers
Shared registered office
50 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 Cosyseal 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
- 05038490
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 February 2004 (22 years ago)
- Registered office
- 13 Montpelier Avenue, Bexley, DA5 3AP
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 1 February 2026
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Bexley
Other active electrical contractors registered in Bexley.
- Crofton Electrical Services Limited2001
- D&L Electrical Ltd2025
- Darrylusherelectrics Ltd2015
- Eacompany Limited2025
- Elart Limited2019
- Electric 24 Limited2019
- Ellis Controls Limited2008
- Evc Electrical Installations Ltd2019
All electrical contractors in Bexley · All trades in Bexley · Electricians across the UK
Frequently asked questions
When are Cosyseal Windows Limited's accounts due?
Cosyseal Windows Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Cosyseal 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 Cosyseal Windows Limited still trading?
Cosyseal 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 Cosyseal Windows Limited do?
Cosyseal Windows Limited is registered under Electrical installation (SIC 43210).
How old is Cosyseal Windows Limited?
Cosyseal Windows Limited was incorporated on 9 February 2004, 22 years ago.
What is the penalty if Cosyseal 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 Cosyseal 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.