- Companies
- Installers
- London
- Inzonex Ltd
Inzonex Ltd
- Company number
- 16856805
- Incorporated
- 14 Nov 2025
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Other construction installation; Non-specialised wholesale trade; Other engineering activities; Other research and experimental development on natural sciences and engineering
Inzonex Ltd is a newly incorporated private limited company registered in London, company number 16856805, one of 2,278 installation companies (insulation, lifts, shutters and similar) in London. Its next accounts are due at Companies House on 14 August 2027, and its first CT600 is due at HMRC on 13 November 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 Inzonex Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 5PF on a map.
Other trade companies in W1W
- Civaris LtdSpecialist contractors
- R&R Construction Group LtdBuilders
- Aurum Cooling LtdPlumbers and heating engineers
- Steam Wood Stone LtdFinishing trades
- Hau Developments LimitedProperty developers
- Group Atlas Financial 83 LtdPainters and decorators
- Energy Reward LtdMotor traders
- Holly’S Housekeeping LtdCleaning companies
Shared registered office
1,494 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 Inzonex 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 14 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 15 Aug 2027 to 14 Sep 2027 | £150 |
| 1 to 3 months late | 15 Sep 2027 to 14 Nov 2027 | £375 |
| 3 to 6 months late | 15 Nov 2027 to 14 Feb 2028 | £750 |
| More than 6 months late | From 15 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 16856805
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 November 2025
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Other construction installation (SIC 43290)
Non-specialised wholesale trade (SIC 46900)
Other engineering activities (SIC 71129)
Other research and experimental development on natural sciences and engineering (SIC 72190) - Year end
- 30 November (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in London
Other active installation companies (insulation, lifts, shutters and similar) registered in London.
- Ips Interface Ltd2020
- Iron Wolf Contractors Ltd2021
- Ironclad Fire Protection Limited2025
- Ironguard Security Systems Ltd2025
- Irwell Fire Ltd2021
- Ish UK Maintenance Ltd2026
- Isl Installation Solutions Ltd2013
- Islam and Sons Limited2021
All installation companies (insulation, lifts, shutters and similar) in London · All trades in London · Installers across the UK
Frequently asked questions
When are Inzonex Ltd's accounts due?
Inzonex Ltd's next accounts are due at Companies House by 14 August 2027 (in 306 days), covering the period to 30 November 2026.
When is Inzonex 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 13 November 2026, due by 13 November 2027, and one for the period to 30 November 2026, due by 30 November 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Inzonex Ltd still trading?
Inzonex 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 Inzonex Ltd do?
Inzonex Ltd is registered under Other construction installation (SIC 43290); Non-specialised wholesale trade (SIC 46900); Other engineering activities (SIC 71129); Other research and experimental development on natural sciences and engineering (SIC 72190).
How old is Inzonex Ltd?
Inzonex Ltd was incorporated on 14 November 2025, less than a year ago.
What is the penalty if Inzonex 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 Inzonex 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.