- Companies
- Property developers
- Swansea
- Castell Group Ltd
Castell Group Ltd
- Company number
- 11990055
- Incorporated
- 10 May 20197 years trading
- Registered office
- 5 Dyffryn Court Riverside Business Park, Swansea Vale, Swansea, SA7 0AP
- Nature of business
- Development of building projects; Buying and selling of own real estate
Castell Group Ltd is a 7-year-old private limited company registered in Swansea, company number 11990055, one of 273 property development companies in Swansea. 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 up £107K (+207.2%) on the year before, to £55K.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- Current assets of £3.8M against £186K owed within a year: more than 10 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £55K | £3.8M | £186K | 0 | |
| 31 Mar 2024 | -£51K | £57 | £3.1M | £667K | 2 |
| 31 May 2023 | -£35K | £35K | £3.3M | £1.1M | 2 |
| 31 May 2022 | -£35K | £17K | £1.9M | £440K | 0 |
| 31 May 2021 | -£1,376 | £424 | £301K | £257K | 0 |
| 31 May 2020 | £139 | £170K | £121K | 1 |
Where Castell Group Ltd is registered
The registered office is in Swansea (SA7), in the Swansea local authority area, Wales. Show SA7 0AP on a map.
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Also registered at this address
15 other companies use the same registered office as Castell Group Ltd.
- Barry Developments SPV 1 LtdProperty developers
- Caerphilly Developments SPV 1 LtdProperty developers
- Castell Construction LtdBuilders
- Castell Holdings LtdProperty developers
- Castell Land Holdings RCT SPV 1 LtdProperty developers
- Castell Land Holdings Swansea SPV 1 LtdProperty developers
- Coity Developments SPV 1 LtdProperty developers
- Neath Developments SPV 1 LtdProperty developers
- Pembrokeshire Developments SPV 1 LtdProperty developers
- Pontypridd Developments SPV 1 LtdProperty developers
- Port Talbot Developments SPV 1 LtdProperty developers
- Pyle Developments SPV LtdProperty developers
- Rhondda Developments SPV 1 LtdProperty developers
- Rhondda Developments SPV 2 LtdProperty developers
- Swansea Developments SPV 2 LtdBuilders
What happens if Castell Group 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
- 11990055
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 May 2019 (7 years ago)
- Registered office
- 5 Dyffryn Court Riverside Business Park, Swansea Vale, Swansea, SA7 0AP
- Nature of business
- Development of building projects (SIC 41100)
Buying and selling of own real estate (SIC 68100) - Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 30 October 2025
- Charges (mortgages)
- 4 outstanding of 4 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 Swansea
Other active property development companies registered in Swansea.
- Castell Holdings Ltd2021
- Castell Land Holdings RCT SPV 1 Ltd2023
- Castell Land Holdings Swansea SPV 1 Ltd2023
- Caterworld Limited1979
- CJ3 Ltd2020
- Classic Stove Installations Ltd2014
- Clearway Property and Management Services Limited2023
- CLM Groundworks Limited2005
All property development companies in Swansea · All trades in Swansea · Property developers across the UK
Frequently asked questions
When are Castell Group Ltd's accounts due?
Castell Group 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 Castell Group 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 Castell Group Ltd still trading?
Castell Group 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 Castell Group Ltd do?
Castell Group Ltd is registered under Development of building projects (SIC 41100); Buying and selling of own real estate (SIC 68100).
How old is Castell Group Ltd?
Castell Group Ltd was incorporated on 10 May 2019, 7 years ago.
What is the penalty if Castell Group 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 Castell Group 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.