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- Os1 Limited
Company profile · Cleaning companies
Os1 Limited
Os1 Limited is a 7-year-old private limited company registered in Swansea, company number 12198665, one of 125 cleaning companies in Swansea. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 30 September 2025, as filed at Companies House.
Os1 Limited over the years
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 £27K (+329.8%) on the year before, to £35K.
- Net assets rose in 4 of 5 year-on-year comparisons on record.
- Current assets of £83K against £71K owed within a year: 1.2 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £35K | £83K | £71K | 2 | |
| 30 Sep 2024 | £8,125 | £21K | £9,863 | 1 | |
| 30 Sep 2023 | £10K | £2,178 | £9,819 | £18K | 3 |
| 30 Sep 2022 | £452 | £4,751 | £14K | £30K | 4 |
| 30 Sep 2021 | £164 | £10K | £16K | £30K | 1 |
| 30 Sep 2020 | £1 | £1 |
Where Os1 Limited is registered
The registered office is in Swansea (SA3), in the Swansea local authority area, Wales. Show SA3 5NG on a map.
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- Soulterra LtdProperty developers
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- Gower Refrigeration and Air Conditioning LtdPlumbers and heating engineers
- JH Energy Engineering LtdProperty developers
- GHL CC LtdFloor and wall tilers
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- Jam Co1 LtdProperty developers
Also registered at this address
1 other company uses the same registered office as Os1 Limited.
- Offshore Geotechnics LtdCivil engineering
What happens if Os1 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 12198665
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 September 2019 (7 years ago)
- Registered office
- 126 West Cross Lane, West Cross, Swansea, SA3 5NG
- Nature of business
- Other cleaning services (SIC 81299)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 9 September 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
Filing notes for cleaning companies
Cleaning companies are often staff-heavy, so wages, pension contributions and the employment allowance all show up in the accounts.
Similar companies in Swansea
Other active cleaning companies registered in Swansea.
- Peninsula Exterior Cleaning Swansea Ltd2024
- Pink Cleaning Swansea Ltd2012
- Platinum SW Cleaning Services Ltd2018
- Pontardawe Hand Car Wash Ltd2026
- Precious Time Cleaning Solutions Ltd2026
- Premium Cleaning Group Limited2023
- Prestige Wash Swansea Limited2024
- Regimental Cleaning Services Ltd2018
All cleaning companies in Swansea · All trades in Swansea · Cleaning companies across the UK
Frequently asked questions
When are Os1 Limited's accounts due?
Os1 Limited's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Os1 Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Os1 Limited still trading?
Os1 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 Os1 Limited do?
Os1 Limited is registered under Other cleaning services (SIC 81299).
How old is Os1 Limited?
Os1 Limited was incorporated on 10 September 2019, 7 years ago.
What is the penalty if Os1 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 Os1 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.