- Company number
- 17343915
- Incorporated
- 16 Jul 2026
- Registered office
- 6 Frogmore Court, Plymouth, PL6 5QX
- Nature of business
- Construction of domestic buildings; Roofing activities
Keystone Contracting Ltd is a newly incorporated private limited company registered in Plymouth, company number 17343915, one of 182 building contractors in Plymouth. Its next accounts are due at Companies House on 16 April 2028, and its first CT600 is due at HMRC on 15 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 Contracting Ltd is registered
The registered office is in Plymouth (PL6), in the Plymouth local authority area, South West. Show PL6 5QX on a map.
Other trade companies in PL6
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- A-Frame Scaffolding LimitedScaffolders
- SW Plantroom Partners LtdPlumbers and heating engineers
- Trueline (SW) LtdJoiners and carpenters
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- New Cut Carpentry LimitedJoiners and carpenters
- Sos 360 LtdBuilders
What happens if Keystone Contracting 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 16 April 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 17 Apr 2028 to 16 May 2028 | £150 |
| 1 to 3 months late | 17 May 2028 to 16 Jul 2028 | £375 |
| 3 to 6 months late | 17 Jul 2028 to 16 Oct 2028 | £750 |
| More than 6 months late | From 17 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
- 17343915
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 July 2026
- Registered office
- 6 Frogmore Court, Plymouth, PL6 5QX
- Nature of business
- Construction of domestic buildings (SIC 41202)
Roofing activities (SIC 43910) - Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Plymouth
Other active building contractors registered in Plymouth.
- KHP (Wyndham Hall) Limited2017
- L&S Home Improvements (SW) Limited2026
- LC Group (SW) Ltd2025
- LD Building (SW) Ltd2026
- Liam Quick Construction Limited2020
- Life Space Cabins Ltd2016
- Lita Formwork & Construction Ltd2026
- LJN Plastering & Building Services Ltd2026
All building contractors in Plymouth · All trades in Plymouth · Builders across the UK
Frequently asked questions
When are Keystone Contracting Ltd's accounts due?
Keystone Contracting Ltd's next accounts are due at Companies House by 16 April 2028 (in 552 days), covering the period to 31 July 2027.
When is Keystone Contracting 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 15 July 2027, due by 15 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 Contracting Ltd still trading?
Keystone Contracting 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 Contracting Ltd do?
Keystone Contracting Ltd is registered under Construction of domestic buildings (SIC 41202); Roofing activities (SIC 43910).
How old is Keystone Contracting Ltd?
Keystone Contracting Ltd was incorporated on 16 July 2026, less than a year ago.
What is the penalty if Keystone Contracting 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 Contracting 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.