- Company number
- 17025438
- Incorporated
- 10 Feb 2026
- Registered office
- 23 Gloucester Avenue, Slough, SL1 3AW
- Nature of business
- Construction of domestic buildings
Keystone 20 Ltd is a newly incorporated private limited company registered in Slough, company number 17025438, one of 683 building contractors in Slough. Its next accounts are due at Companies House on 10 November 2027, and its first CT600 is due at HMRC on 9 February 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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Who runs and owns Keystone 20 Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| P*** S*** | Director | Feb 2026 |
Person with significant control
Where Keystone 20 Ltd is registered
The registered office is in Slough (SL1), in the Slough local authority area, South East. Show SL1 3AW on a map.
Other trade companies in SL1
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- Westside Automotive LtdMotor traders
- Shadeworks LtdInstallers
- Yad Building Services LimitedBuilders
- Slough Vehicle Repair Centre LtdMechanics and garages
- Hadi Automotive LtdMotor traders
- Imperial Berkshire Motors LtdMotor traders
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What happens if Keystone 20 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 10 November 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Nov 2027 to 10 Dec 2027 | £150 |
| 1 to 3 months late | 11 Dec 2027 to 10 Feb 2028 | £375 |
| 3 to 6 months late | 11 Feb 2028 to 10 May 2028 | £750 |
| More than 6 months late | From 11 May 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Feb 2028 | £200 |
| 3 months late | 28 May 2028 | another £200 |
| 6 months late | 28 Aug 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 17025438
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 February 2026
- Registered office
- 23 Gloucester Avenue, Slough, SL1 3AW
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 28 February (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 7 April 2026
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 Slough
Other active building contractors registered in Slough.
- Khalsa Building Construction Ltd2017
- Khan & Khan Ltd2015
- Khocha Construction Ltd2026
- Kimi Designs Limited2019
- King Construction Group Ltd2025
- Kitt Services Ltd2022
- KNP Construction Limited2024
- KP Construction and Interiors Limited2025
All building contractors in Slough · All trades in Slough · Builders across the UK
Frequently asked questions
When are Keystone 20 Ltd's accounts due?
Keystone 20 Ltd's next accounts are due at Companies House by 10 November 2027 (in 394 days), covering the period to 28 February 2027.
When is Keystone 20 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 9 February 2027, due by 9 February 2028, and one for the period to 28 February 2027, due by 28 February 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is Keystone 20 Ltd still trading?
Keystone 20 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 20 Ltd do?
Keystone 20 Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Keystone 20 Ltd?
Keystone 20 Ltd was incorporated on 10 February 2026, less than a year ago.
Who runs Keystone 20 Ltd?
Keystone 20 Ltd has 1 active director, the longest-serving appointed in Feb 2026. Their names and service addresses are on the Companies House register.
Who owns Keystone 20 Ltd?
One person or company has significant control of Keystone 20 Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Keystone 20 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 20 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.