- Companies
- Electricians
- London
- Casstec Ltd
Casstec Ltd
- Company number
- 16690164
- Incorporated
- 2 Sep 20251 year trading
- Registered office
- 3RD Floor, 86-90, Paul Street, London, England, EC2A 4NE
- Nature of business
- Electrical installation; Other professional, scientific and technical activities n.e.c.; Private security activities
Casstec Ltd is a 1-year-old private limited company registered in London, company number 16690164, one of 3,448 electrical contractors in London. Its next accounts are due at Companies House on 2 June 2027, and its first CT600 is due at HMRC on 1 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 Casstec Ltd is registered
The registered office is in London (EC2A), in the Hackney local authority area, London. Show EC2A 4NE on a map.
Other trade companies in EC2A
- Simlan Management LtdCleaning companies
- Renova Secure LtdBuilders
- Auraglasspartitions LtdGlaziers
- A2D Professional Cleaning LtdCleaning companies
- Matson Co. LtdProperty developers
- Paint Hub LimitedMechanics and garages
- SJK Construction & Management LtdBuilders
- Cenlora Cleaning Group LtdCleaning companies
Shared registered office
1,581 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 Casstec 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 2 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 3 Jun 2027 to 2 Jul 2027 | £150 |
| 1 to 3 months late | 3 Jul 2027 to 2 Sep 2027 | £375 |
| 3 to 6 months late | 3 Sep 2027 to 2 Dec 2027 | £750 |
| More than 6 months late | From 3 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
- 16690164
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 2 September 2025 (1 year ago)
- Registered office
- 3RD Floor, 86-90, Paul Street, London, England, EC2A 4NE
- Nature of business
- Electrical installation (SIC 43210)
Other professional, scientific and technical activities n.e.c. (SIC 74909)
Private security activities (SIC 80100) - Year end
- 30 September (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in London
Other active electrical contractors registered in London.
- Castor Site Services Ltd2017
- Cat Electrics Ltd2025
- Cave Critical Systems Ltd2026
- Cavendish Fire and Security Ltd2022
- CBS Dartford Limited2009
- Cbyb Maintenance Solutions Ltd2024
- CC Electrical Installations London Ltd2017
- CC Electrical Services (London) Ltd2013
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Casstec Ltd's accounts due?
Casstec Ltd's next accounts are due at Companies House by 2 June 2027 (in 233 days), covering the period to 30 September 2026.
When is Casstec 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 1 September 2026, due by 1 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 Casstec Ltd still trading?
Casstec Ltd is listed as active on the Companies House register (checked 12 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 Casstec Ltd do?
Casstec Ltd is registered under Electrical installation (SIC 43210); Other professional, scientific and technical activities n.e.c. (SIC 74909); Private security activities (SIC 80100).
How old is Casstec Ltd?
Casstec Ltd was incorporated on 2 September 2025, 1 year ago.
What is the penalty if Casstec 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 Casstec Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.