- Companies
- Cleaning companies
- London
- Thetio Ltd.
Thetio Ltd.
- Company number
- 16728567
- Incorporated
- 18 Sep 20251 year trading
- Registered office
- Monomark House, 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Other cleaning services
Thetio Ltd. is a 1-year-old private limited company registered in London, company number 16728567, one of 5,627 cleaning companies in London. Its next accounts are due at Companies House on 18 June 2027, and its first CT600 is due at HMRC on 17 September 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where Thetio Ltd. is registered
The registered office is in London (WC1N), in the Camden local authority area, London. Show WC1N 3AX on a map.
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Also registered at this address
14 other companies use the same registered office as Thetio Ltd..
- 2MG Invest LtdProperty developers
- 360 Degree Cleaning Services LimitedCleaning companies
- A and R Response Damp Consultancy LtdSpecialist contractors
- A1 Crystal Cleaning LtdCleaning companies
- Armar Builders LtdJoiners and carpenters
- Arvelo Group LtdMotor traders
- Atkinson Compliance LtdPlumbers and heating engineers
- Cali Environment & Support Services LtdCleaning companies
- Ja Construction Group LtdProperty developers
- Key4U LtdCleaning companies
- M-2 Construction London LimitedBuilders
- Ntrio LtdProperty developers
- Q - Build Maintenance (UK) LimitedFacilities management
- Shinecraft Cleaning Services Ltd. LtdCleaning companies
What happens if Thetio 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 18 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 19 Jun 2027 to 18 Jul 2027 | £150 |
| 1 to 3 months late | 19 Jul 2027 to 18 Sep 2027 | £375 |
| 3 to 6 months late | 19 Sep 2027 to 18 Dec 2027 | £750 |
| More than 6 months late | From 19 Dec 2027 | £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
- 16728567
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 September 2025 (1 year ago)
- Registered office
- Monomark House, 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Other cleaning services (SIC 81299)
- Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
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 London
Other active cleaning companies registered in London.
- Think2Wise Ltd2026
- Thirty6 Cleaning Ltd2025
- Thompson Decorating Services Limited2014
- Three Crowns Cleaning Services Limited2006
- Threehand Cleaners Ltd2022
- Threshold Cleaning Ltd2026
- Thrive Sciences Limited2024
- Through the Pods Limited2025
All cleaning companies in London · All trades in London · Cleaning companies across the UK
Frequently asked questions
When are Thetio Ltd.'s accounts due?
Thetio Ltd.'s next accounts are due at Companies House by 18 June 2027 (in 248 days), covering the period to 30 September 2026.
When is Thetio Ltd.'s CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 17 September 2026, due by 17 September 2027, and one for the period to 30 September 2026, due by 30 September 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Thetio Ltd. still trading?
Thetio 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 Thetio Ltd. do?
Thetio Ltd. is registered under Other cleaning services (SIC 81299).
How old is Thetio Ltd.?
Thetio Ltd. was incorporated on 18 September 2025, 1 year ago.
What is the penalty if Thetio 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 Thetio 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.