- Companies
- Property developers
- Stanmore
- Keystone Conservation & Construction Ltd
Keystone Conservation & Construction Ltd
- Company number
- 14817927
- Incorporated
- 20 Apr 20233 years trading
- Registered office
- Devonshire House 582 Honeypot Lane, Stanmore, Middlesex, HA7 1JS
- Nature of business
- Development of building projects
Keystone Conservation & Construction Ltd is a 3-year-old private limited company registered in Stanmore, company number 14817927, one of 204 property development companies in Stanmore. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets unchanged on the year before, at £1.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £1 | £1 | 0 | ||
| 31 Mar 2024 | £1 | £1 | 0 |
Where Keystone Conservation & Construction Ltd is registered
The registered office is in Stanmore (HA7), in the Harrow local authority area, London. Show HA7 1JS on a map.
Other trade companies in HA7
- Vatra Developments LtdBuilders
- Air and Waves LtdPlumbers and heating engineers
- R & R Building Services LtdFinishing trades
- Berculean BBV Ltd LtdBuilders
- Velorent LtdMotor traders
- Autex LtdMechanics and garages
- TH Motorcycles LtdMotor traders
- Ady Painting and Decorating LtdInstallers
Also registered at this address
5 other companies use the same registered office as Keystone Conservation & Construction Ltd.
- Brewing & Engineering Consultancy Services LimitedMachinery repair and installation
- Buildcare Solutions LimitedInstallers
- Chesham Concepts LtdBuilders
- Dominex LtdFinishing trades
- Tinkers Wood Services LtdLandscapers and gardeners
What happens if Keystone Conservation & Construction 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 14817927
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 April 2023 (3 years ago)
- Registered office
- Devonshire House 582 Honeypot Lane, Stanmore, Middlesex, HA7 1JS
- Nature of business
- Development of building projects (SIC 41100)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 19 April 2026
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Stanmore
Other active property development companies registered in Stanmore.
- KMP (Forest Gate) Limited2016
- KMP (High Wycombe) Limited2016
- KMP (Stanmore) Ltd2025
- KMP (Surrey Quays) Limited2014
- Langham Grove Limited2016
- Langley Property(Slough) Limited2025
- Laural Developments Ltd2024
- Lbsuk Limited2025
All property development companies in Stanmore · All trades in Stanmore · Property developers across the UK
Frequently asked questions
When are Keystone Conservation & Construction Ltd's accounts due?
Keystone Conservation & Construction Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Keystone Conservation & Construction Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Keystone Conservation & Construction Ltd still trading?
Keystone Conservation & Construction 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 Conservation & Construction Ltd do?
Keystone Conservation & Construction Ltd is registered under Development of building projects (SIC 41100).
How old is Keystone Conservation & Construction Ltd?
Keystone Conservation & Construction Ltd was incorporated on 20 April 2023, 3 years ago.
What is the penalty if Keystone Conservation & Construction 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 Conservation & Construction 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.