- Companies
- Electricians
- Carshalton
- Keystone Connections Ltd
Keystone Connections Ltd
- Company number
- 17305147
- Incorporated
- 28 Jun 2026
- Registered office
- 4A William Street, Carshalton, SM5 2RB
- Nature of business
- Electrical installation
Keystone Connections Ltd is a newly incorporated private limited company registered in Carshalton, company number 17305147, one of 33 electrical contractors in Carshalton. Its next accounts are due at Companies House on 28 March 2028, and its first CT600 is due at HMRC on 27 June 2028.
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 Keystone Connections Ltd is registered
The registered office is in Carshalton (SM5), in the Sutton local authority area, London. Show SM5 2RB on a map.
Other trade companies in SM5
- Rich Detailz LtdMechanics and garages
- Sutton Motor and Garage LtdMechanics and garages
- Ecobuild Plumbing & Heating LtdPlumbers and heating engineers
- Aaircon Services LtdPlumbers and heating engineers
- Perthy Properties (Greenhills) LimitedProperty developers
- Jophp LimitedCleaning companies
- Pro-Type Roofing LtdRoofers
- Mic Cleaning LimitedCleaning companies
What happens if Keystone Connections 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 28 March 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Mar 2028 to 28 Apr 2028 | £150 |
| 1 to 3 months late | 29 Apr 2028 to 28 Jun 2028 | £375 |
| 3 to 6 months late | 29 Jun 2028 to 28 Sep 2028 | £750 |
| More than 6 months late | From 29 Sep 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2028 | £200 |
| 3 months late | 30 Sep 2028 | another £200 |
| 6 months late | 30 Dec 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 2029 | 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
- 17305147
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 June 2026
- Registered office
- 4A William Street, Carshalton, SM5 2RB
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 June (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 Carshalton
Other active electrical contractors registered in Carshalton.
- L.I.T Electrical Services Ltd2016
- LB Electrical London Ltd2026
- MM Building Services Ltd2014
- Newlive Ltd2016
- Nextphase Contractors Ltd2025
- Ozone Controls Ltd2025
- Prime Ignition Ltd2012
- R C Electricool Limited2024
All electrical contractors in Carshalton · All trades in Carshalton · Electricians across the UK
Frequently asked questions
When are Keystone Connections Ltd's accounts due?
Keystone Connections Ltd's next accounts are due at Companies House by 28 March 2028 (in 532 days), covering the period to 30 June 2027.
When is Keystone Connections 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 27 June 2027, due by 27 June 2028, and one for the period to 30 June 2027, due by 30 June 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Connections Ltd still trading?
Keystone Connections 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 Keystone Connections Ltd do?
Keystone Connections Ltd is registered under Electrical installation (SIC 43210).
How old is Keystone Connections Ltd?
Keystone Connections Ltd was incorporated on 28 June 2026, less than a year ago.
What is the penalty if Keystone Connections 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 Keystone Connections 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.