- Companies
- Electricians
- London
- Sine Wave Electrical Ltd
Sine Wave Electrical Ltd
- Company number
- 08926298
- Incorporated
- 6 Mar 201412 years trading
- Registered office
- 1 Admirals Court, Windlesham Grove, London, SW19 6AP
- Nature of business
- Electrical installation
Sine Wave Electrical Ltd is a 12-year-old private limited company registered in London, company number 08926298, one of 3,448 electrical contractors in London. 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 £68 (+0.1%) on the year before, to -£50K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £84 against £50K owed within a year: 0.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | -£50K | £84 | £50K | 0 | |
| 31 Mar 2024 | -£50K | £16 | £50K | 0 | |
| 31 Mar 2023 | -£50K | £1,305 | £1,305 | £51K | 0 |
| 31 Mar 2022 | -£39K | £11K | £50K | 0 | |
| 31 Mar 2021 | -£22K | £28K | 0 | ||
| 31 Mar 2020 | -£3,094 | £3,094 | 0 | ||
| 31 Mar 2019 | £3,018 | £43 | £3,061 | ||
| 31 Mar 2018 | £1,784 | £62 | £1,846 | ||
| 31 Mar 2017 | -£2,030 | £516 | £2,546 | ||
| 31 Mar 2016 | -£470 | £47 | £517 |
Public contracts won
Sine Wave Electrical Ltd has one public sector contract award on record; the ones with their own published value total £177K (2025). Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Dorset HealthCare University NHS Foundation Trust | DHC DH1338 Weymouth Hospital Replacement Standby Generator | £177K | 14 Apr 2025 |
Where Sine Wave Electrical Ltd is registered
The registered office is in London (SW19), in the Wandsworth local authority area, London. Show SW19 6AP on a map.
Other trade companies in SW19
- Firstfixlondon Ltd.Builders
- Rainbow One Construction UK LtdSpecialist contractors
- Base Bloc LimitedBuilders
- Concealed Climate LimitedPlumbers and heating engineers
- Morningside LtdProperty developers
- Cupi-Building LtdBuilders
- Crown Infra London LtdBuilders
- Aj & Co One LtdProperty developers
What happens if Sine Wave Electrical 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
- 08926298
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 March 2014 (12 years ago)
- Registered office
- 1 Admirals Court, Windlesham Grove, London, SW19 6AP
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 6 March 2026
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 London
Other active electrical contractors registered in London.
- Sinead Consultants Limited2014
- Siqa Group Limited2022
- Sisyphean Summits Ltd2024
- Site Voyance Ltd2025
- Six Seven Project Ltd2014
- SJ Electrical & Renewable Limited2026
- Sjo Electrical Services Limited2025
- SK Electrical Services (UK) Ltd2012
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Sine Wave Electrical Ltd's accounts due?
Sine Wave Electrical 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 Sine Wave Electrical 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 Sine Wave Electrical Ltd still trading?
Sine Wave Electrical 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 Sine Wave Electrical Ltd do?
Sine Wave Electrical Ltd is registered under Electrical installation (SIC 43210).
How old is Sine Wave Electrical Ltd?
Sine Wave Electrical Ltd was incorporated on 6 March 2014, 12 years ago.
Has Sine Wave Electrical Ltd won public sector contracts?
Yes. Sine Wave Electrical Ltd has one contract award from public bodies on Contracts Finder and Find a Tender (those with their own published value total £177K), most recently from Dorset HealthCare University NHS Foundation Trust.
What is the penalty if Sine Wave Electrical 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 Sine Wave Electrical 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.