- Companies
- Electricians
- Windsor
- Castles Services Limited
Castles Services Limited
- Company number
- 15570912
- Incorporated
- 17 Mar 20242 years trading
- Registered office
- 54 Vale Road, Windsor, SL4 5LA
- Nature of business
- Electrical installation; Other construction installation
Castles Services Limited is a 2-year-old private limited company registered in Windsor, company number 15570912, one of 22 electrical contractors in Windsor. 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 £23K (+31.9%) on the year before, to £95K.
- Current assets of £113K against £33K owed within a year: 3.5 times cover.
- 1 employee on average, up from 0 the year before.
- Balance sheets on record for 2 years, 2025 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £95K | £32K | £113K | £33K | 1 |
| 31 Mar 2025 | £72K | £27K | £99K | £27K | 0 |
Where Castles Services Limited is registered
The registered office is in Windsor (SL4), in the Windsor and Maidenhead local authority area, South East. Show SL4 5LA on a map.
Other trade companies in SL4
- A3 Hand Car Wash and Valeting Center LimitedCleaning companies
- Time Watch Repair Watford LtdRepair services
- Mobile Tyre Services 24/7 LtdMechanics and garages
- Hullscrub Thames LtdCleaning companies
- Black Rose Automotive Group LtdMotor traders
- Maldec Hatchet Farm LimitedProperty developers
- Pinehill Homes Partnerships LtdProperty developers
- Heatsense Renewables LtdElectricians
Also registered at this address
9 other companies use the same registered office as Castles Services Limited.
- A List Roofing LtdRoofers
- Agd Construction Services LimitedJoiners and carpenters
- Delorange LtdPlumbers and heating engineers
- FS Vale Management LimitedGroundworks and demolition
- JDS Design and Build LtdBuilders
- On Site Spray LtdPainters and decorators
- Tanktap Beer Services LimitedMachinery repair and installation
- Thames Valley Automotive LtdMotor traders
- Vision Building and Landscaping LtdBuilders
What happens if Castles Services 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
- 15570912
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 March 2024 (2 years ago)
- Registered office
- 54 Vale Road, Windsor, SL4 5LA
- Nature of business
- Electrical installation (SIC 43210)
Other construction installation (SIC 43290) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 27 November 2025
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Windsor
Other active electrical contractors registered in Windsor.
- Crawford's Electrical Limited2014
- Dedicated Circuits Limited1997
- DJM Tech Services Ltd2023
- Excelsior Projects Limited2017
- Heatsense Renewables Ltd2026
- Lighting Logistics Limited2007
- London Building Services Management Ltd2026
- Marks Sparks Limited2022
All electrical contractors in Windsor · All trades in Windsor · Electricians across the UK
Frequently asked questions
When are Castles Services Limited's accounts due?
Castles Services 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 Castles Services 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 Castles Services Limited still trading?
Castles Services 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 Castles Services Limited do?
Castles Services Limited is registered under Electrical installation (SIC 43210); Other construction installation (SIC 43290).
How old is Castles Services Limited?
Castles Services Limited was incorporated on 17 March 2024, 2 years ago.
What is the penalty if Castles Services 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 Castles Services 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.