- Companies
- Electricians
- London
- Sparklux Ltd
Sparklux Ltd
- Company number
- 12663023
- Incorporated
- 11 Jun 20206 years trading
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Electrical installation
Sparklux Ltd is a 6-year-old private limited company registered in London, company number 12663023, one of 3,448 electrical contractors in London. Its next accounts are due at Companies House on 31 March 2028, and the CT600 for the period to 30 June 2027 is due at HMRC on 30 June 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 down £702 (-109.2%) on the year before, to -£1,345.
- Net assets rose in 1 of 5 year-on-year comparisons on record.
- Current assets of £11 against £1,188 owed within a year: 0.0 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Jun 2026 | -£1,345 | £11 | £1,188 | 1 | |
| 30 Jun 2025 | -£643 | £102 | £577 | 1 | |
| 30 Jun 2024 | £80 | £1,513 | £1,233 | 1 | |
| 30 Jun 2023 | -£852 | £9 | £1,355 | 1 | |
| 30 Jun 2022 | £137 | £2,527 | £3,248 | 1 | |
| 30 Jun 2021 | £448 | £2,968 | £3,248 | 1 |
Where Sparklux Ltd is registered
The registered office is in London (WC1N), in the Camden local authority area, London. Show WC1N 3AX on a map.
Other trade companies in WC1N
- JDB Consult LtdProperty developers
- Pixie Marine LimitedMachinery repair and installation
- Old Man Edition LtdFloor and wall tilers
- Wise Choice Security LimitedMechanics and garages
- Prime Coating Services LtdMotor traders
- Strive Lands LtdProperty developers
- Statom LimitedBuilders
- Jose Galvez LtdRepair services
Shared registered office
554 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Sparklux 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 March 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Apr 2028 to 30 Apr 2028 | £150 |
| 1 to 3 months late | 1 May 2028 to 30 Jun 2028 | £375 |
| 3 to 6 months late | 1 Jul 2028 to 30 Sep 2028 | £750 |
| More than 6 months late | From 1 Oct 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jul 2028 | £200 |
| 3 months late | 30 Sep 2028 | another £200 |
| 6 months late | 30 Dec 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Jun 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
- 12663023
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 June 2020 (6 years ago)
- Registered office
- 27 Old Gloucester Street, London, WC1N 3AX
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 30 June (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 June 2026
- Last confirmation statement
- 13 June 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.
- Sparkplus Ltd2020
- Sparks Energy Ltd2025
- Sparky City Ltd2024
- Sparky Enzo Ltd2024
- Sparky Master Ltd2025
- Sparky Tech Ltd2026
- Sparkz Electricals Ltd2022
- Spart Electricians Ltd2013
All electrical contractors in London · All trades in London · Electricians across the UK
Frequently asked questions
When are Sparklux Ltd's accounts due?
Sparklux Ltd's next accounts are due at Companies House by 31 March 2028 (in 535 days), covering the period to 30 June 2027.
When is Sparklux Ltd's CT600 due?
The CT600 for the period to 30 June 2027 is due at HMRC by 30 June 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 April 2028.
Is Sparklux Ltd still trading?
Sparklux 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 Sparklux Ltd do?
Sparklux Ltd is registered under Electrical installation (SIC 43210).
How old is Sparklux Ltd?
Sparklux Ltd was incorporated on 11 June 2020, 6 years ago.
What is the penalty if Sparklux 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 Sparklux 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.