- Companies
- Specialist contractors
- Sleep Window Systems Ltd
Sleep Window Systems Ltd
- Company number
- 10722919
- Incorporated
- 12 Apr 20179 years trading
- Registered office
- 27 Wellfield, Melin Court, SA11 4AU
- Nature of business
- Other specialised construction activities n.e.c.
Sleep Window Systems Ltd is a 9-year-old private limited company registered in Melin Court, company number 10722919, one of the UK's specialist construction companies. Its next accounts are due at Companies House on 30 December 2026, and the CT600 for the period to 30 March 2026 is due at HMRC on 30 March 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 up £47K (+34.8%) on the year before, to £182K.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- Current assets of £289K against £131K owed within a year: 2.2 times cover.
- 4 employees on average, down from 5 the year before.
- Balance sheets on record for 9 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £182K | £0 | £289K | £131K | 4 |
| 31 Mar 2024 | £135K | £2,226 | £301K | £187K | 5 |
| 30 Mar 2024 | £135K | £301K | £185K | 5 | |
| 30 Mar 2023 | £187K | £384K | £203K | 5 | |
| 30 Mar 2022 | £183K | £360K | £184K | 4 | |
| 31 Mar 2021 | £186K | £406K | £243K | 6 | |
| 31 Mar 2020 | £182K | £415K | £283K | 6 | |
| 31 Mar 2019 | £247K | £12K | £491K | £278K | |
| 31 Mar 2018 | £75K | -£7,373 | £248K | £206K |
Where Sleep Window Systems Ltd is registered
The registered office is in Melin Court (SA11), in the Neath Port Talbot local authority area, Wales. Show SA11 4AU on a map.
Other trade companies in SA11
- A to Z Roofing & Property Maintenance LtdInstallers
- Kalies LtdProperty developers
- Tawe Capital LtdMotor traders
- Alewisindustrial LtdCleaning companies
- MJR Contracting LtdSpecialist contractors
- Joshjones Industrial LtdCleaning companies
- Phillips Roofing & Son LtdRoofers
- D&D Property Developments LimitedProperty developers
What happens if Sleep Window Systems 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 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 31 Dec 2026 to 30 Jan 2027 | £150 |
| 1 to 3 months late | 31 Jan 2027 to 30 Mar 2027 | £375 |
| 3 to 6 months late | 31 Mar 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 31 Mar 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Mar 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
- 10722919
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 April 2017 (9 years ago)
- Registered office
- 27 Wellfield, Melin Court, SA11 4AU
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 30 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 11 April 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies
Other active specialist construction companies.
Frequently asked questions
When are Sleep Window Systems Ltd's accounts due?
Sleep Window Systems Ltd's next accounts are due at Companies House by 30 December 2026 (in 78 days), covering the period to 30 March 2026.
When is Sleep Window Systems Ltd's CT600 due?
The CT600 for the period to 30 March 2026 is due at HMRC by 30 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 31 December 2026.
Is Sleep Window Systems Ltd still trading?
Sleep Window Systems 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 Sleep Window Systems Ltd do?
Sleep Window Systems Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Sleep Window Systems Ltd?
Sleep Window Systems Ltd was incorporated on 12 April 2017, 9 years ago.
What is the penalty if Sleep Window Systems 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 Sleep Window Systems 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.