- Companies
- Property developers
- Reading
- Castlethrone Limited
Castlethrone Limited
- Company number
- 01779083
- Incorporated
- 19 Dec 198342 years trading
- Registered office
- Little Oaks Sandhills, Knowl Hill, Reading, Berkshire, RG10 9XX
- Nature of business
- Development of building projects
Castlethrone Limited is a 42-year-old private limited company registered in Reading, company number 01779083, one of 355 property development companies in Reading. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 up £105K (+4%) on the year before, to £2.7M.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £2,451 against £112K owed within a year: 0.0 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £2.7M | £2,451 | £2,451 | £112K | 3 |
| 31 Mar 2025 | £2.6M | £2,558 | £2,558 | £102K | 3 |
| 31 Mar 2024 | £2.7M | £14K | £14K | £98K | 3 |
| 31 Mar 2023 | £2.7M | £5,794 | £5,794 | £141K | 3 |
| 31 Mar 2022 | £2.7M | £2,461 | £2,461 | £86K | 3 |
| 31 Mar 2021 | £2.8M | £5,514 | £5,514 | £42K | 3 |
| 31 Mar 2020 | £2M | £72K | £72K | £41K | 3 |
| 31 Mar 2019 | £2M | £18K | £18K | £50K | |
| 31 Mar 2018 | £2M | £1,822 | £27K | £39K | 3 |
| 31 Mar 2017 | £2M | £95K | £106K | £86K |
Where Castlethrone Limited is registered
The registered office is in Reading (RG10), in the Wokingham local authority area, South East. Show RG10 9XX on a map.
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Also registered at this address
1 other company uses the same registered office as Castlethrone Limited.
- Bridge Service Garage (Windsor) LimitedMotor traders
What happens if Castlethrone 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 01779083
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 19 December 1983 (42 years ago)
- Registered office
- Little Oaks Sandhills, Knowl Hill, Reading, Berkshire, RG10 9XX
- 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 2026
- Last confirmation statement
- 25 May 2026
- Charges (mortgages)
- 0 outstanding of 18 registered
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 Reading
Other active property development companies registered in Reading.
- Ceegee Investments Ltd2022
- Ceegee Properties (Reading) Limited1963
- Chartom Grace Homes Ltd2025
- Chartom Grace Ltd2014
- Chazey Properties Limited2005
- Citrus Hive Limited2019
- Clearwall Contracting Limited2005
- Clen Property Developments Ltd2025
All property development companies in Reading · All trades in Reading · Property developers across the UK
Frequently asked questions
When are Castlethrone Limited's accounts due?
Castlethrone Limited's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Castlethrone Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Castlethrone Limited still trading?
Castlethrone 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 Castlethrone Limited do?
Castlethrone Limited is registered under Development of building projects (SIC 41100).
How old is Castlethrone Limited?
Castlethrone Limited was incorporated on 19 December 1983, 42 years ago.
What is the penalty if Castlethrone 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 Castlethrone 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.