- Company number
- 10241249
- Incorporated
- 20 Jun 201610 years trading
- Registered office
- Suite 63, 56 Gloucester Road, London, SW7 4UB
- Nature of business
- Construction of domestic buildings
A Windmill Electrics Limited is a 10-year-old private limited company registered in London, company number 10241249, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £7,780 (+54.8%) on the year before, to -£6,422.
- Net assets rose in 3 of 8 year-on-year comparisons on record.
- Current assets of £3,943 against £13K owed within a year: 0.3 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | -£6,422 | £3,943 | £13K | 2 | |
| 31 May 2024 | -£14K | £4,782 | 2 | ||
| 31 May 2023 | -£17K | £3,487 | 2 | ||
| 31 May 2022 | -£14K | £6,232 | £23K | 2 | |
| 31 May 2021 | -£18K | £6,098 | £25K | 3 | |
| 31 May 2020 | -£13K | £7,094 | £21K | 3 | |
| 31 May 2019 | -£8,894 | £5,295 | £15K | 3 | |
| 31 May 2018 | -£5,683 | £1,836 | £8,364 | ||
| 31 May 2017 | -£1,263 | £4,293 | £8,652 |
Where A Windmill Electrics Limited is registered
The registered office is in London (SW7), in the Kensington and Chelsea local authority area, London. Show SW7 4UB on a map.
Other trade companies in SW7
- Old Town KS Group LtdBuilders
- Westbourne Gardens LimitedProperty developers
- Crissyservice LtdInstallers
- Ashcombe Projects LtdBuilders
- WM Shelfco5 LimitedProperty developers
- Platinum Electrical Systems LimitedElectricians
- Vertex Finishes LtdFinishing trades
- Plumbers Direct 24/7 LtdPlumbers and heating engineers
What happens if A Windmill Electrics 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 10241249
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 20 June 2016 (10 years ago)
- Registered office
- Suite 63, 56 Gloucester Road, London, SW7 4UB
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 19 June 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 London
Other active building contractors registered in London.
- A&A Best at First Ltd2018
- A&A Cladding Ltd2026
- A&A Himallari Ltd2017
- A&A Maintenance Services Ltd2021
- A&B Brickwork & Construction Ltd2020
- A&B Builders Ltd2022
- A&B Coreflow Construction Ltd2026
- A&C Renovations Ltd2026
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are A Windmill Electrics Limited's accounts due?
A Windmill Electrics Limited's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is A Windmill Electrics Limited's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is A Windmill Electrics Limited still trading?
A Windmill Electrics 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 A Windmill Electrics Limited do?
A Windmill Electrics Limited is registered under Construction of domestic buildings (SIC 41202).
How old is A Windmill Electrics Limited?
A Windmill Electrics Limited was incorporated on 20 June 2016, 10 years ago.
What is the penalty if A Windmill Electrics 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 A Windmill Electrics 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.