- Companies
- Specialist contractors
- Upminster
- Keystone Diamond Drilling Limited
Keystone Diamond Drilling Limited
- Company number
- 17351514
- Incorporated
- 21 Jul 2026
- Registered office
- 9 Corbets Tey Road, Upminster, RM14 2AP
- Nature of business
- Other specialised construction activities n.e.c.
Keystone Diamond Drilling Limited is a newly incorporated private limited company registered in Upminster, company number 17351514, one of 46 specialist construction companies in Upminster. Its next accounts are due at Companies House on 21 April 2028, and its first CT600 is due at HMRC on 20 July 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 Diamond Drilling Limited is registered
The registered office is in Upminster (RM14), in the Havering local authority area, London. Show RM14 2AP on a map.
Other trade companies in RM14
- Bobofresh LtdCleaning companies
- HTS Construction LtdBuilders
- We Fix Energy LtdCivil engineering
- ZH Services LtdBuilders
- Ragasan LimitedBuilders
- Your Serve LtdCleaning companies
- LC Engineering LtdMachinery repair and installation
- Caat Interiors LtdInstallers
Shared registered office
41 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 Keystone Diamond Drilling Limited 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 21 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 22 Apr 2028 to 21 May 2028 | £150 |
| 1 to 3 months late | 22 May 2028 to 21 Jul 2028 | £375 |
| 3 to 6 months late | 22 Jul 2028 to 21 Oct 2028 | £750 |
| More than 6 months late | From 22 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2028 | £200 |
| 3 months late | 31 Oct 2028 | another £200 |
| 6 months late | 31 Jan 2029 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 17351514
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 July 2026
- Registered office
- 9 Corbets Tey Road, Upminster, RM14 2AP
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Upminster
Other active specialist construction companies registered in Upminster.
- Lamb Building Consultancy Ltd2023
- LDN Interiors Ltd2017
- MBD Contracts Ltd2026
- MBL Fabrication and Fitting UK Ltd2019
- Medspace Solutions Ltd2012
- Mole Form Ltd2025
- MSC Electrical Services Ltd2024
- N & R Building Services Ltd2020
All specialist construction companies in Upminster · All trades in Upminster · Specialist contractors across the UK
Frequently asked questions
When are Keystone Diamond Drilling Limited's accounts due?
Keystone Diamond Drilling Limited's next accounts are due at Companies House by 21 April 2028 (in 556 days), covering the period to 31 July 2027.
When is Keystone Diamond Drilling Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 20 July 2027, due by 20 July 2028, and one for the period to 31 July 2027, due by 31 July 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone Diamond Drilling Limited still trading?
Keystone Diamond Drilling Limited 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 Diamond Drilling Limited do?
Keystone Diamond Drilling Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Keystone Diamond Drilling Limited?
Keystone Diamond Drilling Limited was incorporated on 21 July 2026, less than a year ago.
What is the penalty if Keystone Diamond Drilling Limited 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 Diamond Drilling Limited 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.