- Companies
- Electricians
- Ballymena
- Knox Electrical Limited
Knox Electrical Limited
- Company number
- NI607747
- Incorporated
- 6 Jun 201115 years trading
- Registered office
- At the Offices of D T Carson & Co., 51-53 Thomas Street, Ballymena, BT43 6AZ
- Nature of business
- Electrical installation
Knox Electrical Limited is a 15-year-old private limited company registered in Ballymena, company number NI607747, one of 43 electrical contractors in Ballymena. 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 £129K (-30.4%) on the year before, to £295K.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £636K against £344K owed within a year: 1.8 times cover.
- 25 employees on average, up from 22 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 |
|---|---|---|---|---|---|
| 31 Mar 2026 | £295K | £106K | £636K | £344K | 25 |
| 31 Mar 2025 | £424K | £102K | £581K | £273K | 22 |
| 31 Mar 2024 | £307K | £81K | £487K | £295K | 20 |
| 31 Mar 2023 | £355K | £81K | £470K | £226K | 23 |
| 31 Mar 2022 | £380K | £99K | £443K | £186K | 27 |
| 31 Mar 2021 | £385K | £261K | £527K | £243K | 25 |
| 31 Mar 2020 | £268K | £18K | £193K | £70K | 20 |
| 31 Mar 2019 | £958K | £335K | £466K | £107K | 18 |
| 31 Mar 2018 | £874K | £225K | £464K | £112K | 15 |
| 31 Mar 2017 | £774K | £557K | £839K | £177K | 11 |
Public contracts won
Knox Electrical Limited has one public sector contract award on record (2025). Source: Contracts Finder and Find a Tender award notices. For all of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. These were matched by the company's exact name because the notice gave no company number.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Northern Ireland Electricity Networks Limited | Electricians for the Installation, Refurbishment and Maintenance of Sub Station High & Low Voltage Plant / Equipment | Ceiling, not shown | 3 Mar 2025 |
Where Knox Electrical Limited is registered
The registered office is in Ballymena (BT43), in the Mid and East Antrim local authority area, Northern Ireland. Show BT43 6AZ on a map.
Other trade companies in BT43
- Fyfe Build Solutions LtdBuilders
- Deerfin Properties LtdBuilders
- MTC Media Walls LtdJoiners and carpenters
- BMCL Contracts LtdRoofers
- Icev Pty LtdProperty developers
- GMC Electrical Services (NI) LimitedElectricians
- Braidview Build LtdProperty developers
- Steven Davis Plumbing LtdPlumbers and heating engineers
What happens if Knox 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
- NI607747
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 June 2011 (15 years ago)
- Registered office
- At the Offices of D T Carson & Co., 51-53 Thomas Street, Ballymena, BT43 6AZ
- 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
- 6 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 Ballymena
Other active electrical contractors registered in Ballymena.
- Kopczynski Ltd2026
- LCS Electrical Limited2006
- Lyttle Smart Homes Ltd2021
- Madden Electrical Ltd2023
- Mal Electrical Contractors Limited2017
- Marrs Maintenance Services Ltd2012
- Martin Contracts (NI) Ltd2000
- McKay Electrical (NI) Ltd2018
All electrical contractors in Ballymena · All trades in Ballymena · Electricians across the UK
Frequently asked questions
When are Knox Electrical Limited's accounts due?
Knox 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 Knox 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 Knox Electrical Limited still trading?
Knox 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 Knox Electrical Limited do?
Knox Electrical Limited is registered under Electrical installation (SIC 43210).
How old is Knox Electrical Limited?
Knox Electrical Limited was incorporated on 6 June 2011, 15 years ago.
Has Knox Electrical Limited won public sector contracts?
Yes. Knox Electrical Limited has one contract award from public bodies on Contracts Finder and Find a Tender, most recently from Northern Ireland Electricity Networks Limited.
What is the penalty if Knox 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 Knox 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.