- Companies
- Electricians
- Fareham
- Klystron Limited
Klystron Limited
- Company number
- 02249687
- Incorporated
- 29 Apr 198838 years trading
- Registered office
- 206 Gosport Road, Fareham, PO16 0QJ
- Nature of business
- Electrical installation; Other information technology service activities
Klystron Limited is a 38-year-old private limited company registered in Fareham, company number 02249687, one of 111 electrical contractors in Fareham. Its next accounts are due at Companies House on 29 January 2028, and the CT600 for the period to 29 April 2027 is due at HMRC on 29 April 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 £80K (-86%) on the year before, to £13K.
- Net assets rose in 1 of 9 year-on-year comparisons on record.
- 1 employee on average, down from 2 the year before.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 29 Apr 2026 | £13K | £13K | £0 | 1 | |
| 30 Apr 2025 | £93K | £93K | 2 | ||
| 30 Apr 2024 | £147K | £147K | £0 | 2 | |
| 30 Apr 2023 | £230K | £230K | 2 | ||
| 30 Apr 2022 | £209K | £209K | 2 | ||
| 30 Apr 2021 | £226K | £226K | 2 | ||
| 30 Apr 2020 | £251K | £251K | 2 | ||
| 30 Apr 2019 | £272K | £83K | |||
| 30 Apr 2018 | £288K | £99K | £0 | ||
| 30 Apr 2017 | £316K | £127K | £0 |
Where Klystron Limited is registered
The registered office is in Fareham (PO16), in the Fareham local authority area, South East. Show PO16 0QJ on a map.
Other trade companies in PO16
- Telos Contracts LtdFinishing trades
- Grappuch LimitedFinishing trades
- Cis UK Solutions LtdElectricians
- Pato Construction Group LtdBuilders
- JMS Utilities LimitedCivil engineering
- C Hill Property Maintenance LtdFinishing trades
- BJM Fencing & Landscaping LtdSpecialist contractors
- Baltic Scaffolding LtdScaffolders
What happens if Klystron 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 29 January 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Jan 2028 to 29 Feb 2028 | £150 |
| 1 to 3 months late | 1 Mar 2028 to 29 Apr 2028 | £375 |
| 3 to 6 months late | 30 Apr 2028 to 29 Jul 2028 | £750 |
| More than 6 months late | From 30 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Apr 2028 | £200 |
| 3 months late | 29 Jul 2028 | another £200 |
| 6 months late | 29 Oct 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Apr 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
- 02249687
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 29 April 1988 (38 years ago)
- Registered office
- 206 Gosport Road, Fareham, PO16 0QJ
- Nature of business
- Electrical installation (SIC 43210)
Other information technology service activities (SIC 62090) - Year end
- 29 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 29 April 2026
- Last confirmation statement
- 23 April 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 Fareham
Other active electrical contractors registered in Fareham.
- M4 Consulting Limited2007
- MDR Electrical and Security Ltd2022
- Millennium Structured Networks Limited1999
- Mjfree Electrical Ltd2014
- MKD Electrical & Mechanical Services Ltd2023
- Mortimer Electrical Services Ltd2023
- MSB Electrical Northwest Limited2025
- N J Kearney Electrical Limited2022
All electrical contractors in Fareham · All trades in Fareham · Electricians across the UK
Frequently asked questions
When are Klystron Limited's accounts due?
Klystron Limited's next accounts are due at Companies House by 29 January 2028 (in 473 days), covering the period to 29 April 2027.
When is Klystron Limited's CT600 due?
The CT600 for the period to 29 April 2027 is due at HMRC by 29 April 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 30 January 2028.
Is Klystron Limited still trading?
Klystron 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 Klystron Limited do?
Klystron Limited is registered under Electrical installation (SIC 43210); Other information technology service activities (SIC 62090).
How old is Klystron Limited?
Klystron Limited was incorporated on 29 April 1988, 38 years ago.
What is the penalty if Klystron 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 Klystron 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.