- Companies
- Electricians
- Southampton
- Tandem Electrical Limited
Tandem Electrical Limited
- Company number
- 08390999
- Incorporated
- 6 Feb 201313 years trading
- Registered office
- Stag Gates House, 63-64 the Avenue, Southampton, Hampshire, SO17 1XS
- Nature of business
- Electrical installation
Tandem Electrical Limited is a 13-year-old private limited company registered in Southampton, company number 08390999, one of 342 electrical contractors in Southampton. 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 down £430K (-46.9%) on the year before, to £487K.
- Net assets rose in 0 of 4 year-on-year comparisons on record.
- Current assets of £1.7M against £1.1M owed within a year: 1.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 7 years, 2015 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £487K | £157K | £1.7M | £1.1M | 0 |
| 31 Mar 2025 | £918K | £84K | £2.1M | £1.2M | 0 |
| 31 Mar 2020 | £497 | £172K | £172K | 5 | |
| 31 Mar 2019 | £965 | £5,934 | £214K | £185K | 4 |
| 31 Mar 2017 | £40 | £97K | £82K | ||
| 31 Mar 2016 | £327 | £7,476 | £58K | £7,204 | |
| 28 Feb 2015 | £510 | £0 | £41K | £45K |
Where Tandem Electrical Limited is registered
The registered office is in Southampton (SO17), in the Southampton local authority area, South East. Show SO17 1XS on a map.
Other trade companies in SO17
- Vip Crystal LtdFacilities management
- KTNR LimitedBuilders
- SVS Civil Engineering LtdBuilders
- Solent Auto Group LimitedMotor traders
- Portswood Car Wash LtdCleaning companies
- Ranjit Singh Constructions LimitedBuilders
- Khangura Global LimitedBuilders
- Frontline Builder LtdBuilders
Shared registered office
33 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 Tandem Electrical 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
- 08390999
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 February 2013 (13 years ago)
- Registered office
- Stag Gates House, 63-64 the Avenue, Southampton, Hampshire, SO17 1XS
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 30 July 2026
- Charges (mortgages)
- 1 outstanding of 1 registered
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 Southampton
Other active electrical contractors registered in Southampton.
- Tarnwalk (UK) Limited1993
- Tavendruce Ltd2022
- TCW Electrical Ltd2018
- Teame Electrical Limited2015
- Tenderchange Limited1996
- The Electric Company Southern Ltd2018
- Thorold Electrical Services Ltd2014
- TJM Solutions Ltd2025
All electrical contractors in Southampton · All trades in Southampton · Electricians across the UK
Frequently asked questions
When are Tandem Electrical Limited's accounts due?
Tandem Electrical Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Tandem Electrical 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 Tandem Electrical Limited still trading?
Tandem Electrical 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 Tandem Electrical Limited do?
Tandem Electrical Limited is registered under Electrical installation (SIC 43210).
How old is Tandem Electrical Limited?
Tandem Electrical Limited was incorporated on 6 February 2013, 13 years ago.
What is the penalty if Tandem Electrical 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 Tandem Electrical 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.