- Companies
- Cleaning companies
- Sutton
- Serntech Ltd
Serntech Ltd
- Company number
- 16709606
- Incorporated
- 10 Sep 20251 year trading
- Registered office
- 579 Gander Green Lane, Cheam, Sutton, SM3 9RF
- Nature of business
- General cleaning of buildings; Disinfecting and exterminating services
Serntech Ltd is a 1-year-old private limited company registered in Sutton, company number 16709606, one of 74 cleaning companies in Sutton. Its next accounts are due at Companies House on 10 June 2027, and its first CT600 is due at HMRC on 9 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.
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Where Serntech Ltd is registered
The registered office is in Sutton (SM3), in the Sutton local authority area, London. Show SM3 9RF on a map.
Other trade companies in SM3
- Lutetia Construction LtdBuilders
- Bathroom Edit (Surrey) LtdSpecialist contractors
- Zhupnyk V&S Building LtdSpecialist contractors
- Cleaning National LtdCleaning companies
- Apex MP Construction LtdBuilders
- Ca Property Group LtdProperty developers
- Afonin Services LtdInstallers
- Salopon Services LtdInstallers
What happens if Serntech 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 10 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Jun 2027 to 10 Jul 2027 | £150 |
| 1 to 3 months late | 11 Jul 2027 to 10 Sep 2027 | £375 |
| 3 to 6 months late | 11 Sep 2027 to 10 Dec 2027 | £750 |
| More than 6 months late | From 11 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
- 16709606
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 September 2025 (1 year ago)
- Registered office
- 579 Gander Green Lane, Cheam, Sutton, SM3 9RF
- Nature of business
- General cleaning of buildings (SIC 81210)
Disinfecting and exterminating services (SIC 81291) - Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 10 December 2025
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 Sutton
Other active cleaning companies registered in Sutton.
- Smart Gardens & Cleaning Ltd2021
- Something Special Cleans Ltd2026
- Sparkle Home London Ltd2023
- Sparkle Shark Ltd2026
- Spiff & Spruce Ltd2022
- Spiff + Spruce Commercial Cleaning Ltd2023
- Spotless Solution Services Ltd2026
- Steve Pratt Pest Control Ltd2018
All cleaning companies in Sutton · All trades in Sutton · Cleaning companies across the UK
Frequently asked questions
When are Serntech Ltd's accounts due?
Serntech Ltd's next accounts are due at Companies House by 10 June 2027 (in 241 days), covering the period to 30 September 2026.
When is Serntech 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 9 September 2026, due by 9 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 Serntech Ltd still trading?
Serntech 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 Serntech Ltd do?
Serntech Ltd is registered under General cleaning of buildings (SIC 81210); Disinfecting and exterminating services (SIC 81291).
How old is Serntech Ltd?
Serntech Ltd was incorporated on 10 September 2025, 1 year ago.
What is the penalty if Serntech 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 Serntech 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.