- Companies
- Electricians
- Caernarfon
- Caillan Harris Ltd
Caillan Harris Ltd
- Company number
- 15313867
- Incorporated
- 28 Nov 20232 years trading
- Registered office
- Bigil, Dinorwic, Caernarfon, LL55 3EH
- Nature of business
- Electrical installation; Other building completion and finishing; General cleaning of buildings
Caillan Harris Ltd is a 2-year-old private limited company registered in Caernarfon, company number 15313867, one of 10 electrical contractors in Caernarfon. Companies House shows its accounts as overdue: they were due on 31 August 2026.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Who runs and owns Caillan Harris Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| C*** L*** | Director | Nov 2023 |
Person with significant control
Where Caillan Harris Ltd is registered
The registered office is in Caernarfon (LL55), in the Gwynedd local authority area, Wales. Show LL55 3EH on a map.
Other trade companies in LL55
- Gic Construction & Groundworks LtdInstallers
- Caton Site Welding LtdMachinery repair and installation
- Celtic Heritage Stonemasonry LimitedCivil engineering
- Celtic Heritage Construction LimitedBuilders
- 31 High ST LimitedProperty developers
- Robertson’S Property Services LtdSpecialist contractors
- Tirion Solutions LtdElectricians
- Melltd LtdProperty developers
Also registered at this address
1 other company uses the same registered office as Caillan Harris Ltd.
- Height & Marine LimitedMachinery repair and installation
What happens if Caillan Harris Ltd files late
If the accounts reach Companies House today, the late filing penalty is £375 (£750 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2026 to 30 Sep 2026 | £150 |
| 1 to 3 months late | 1 Oct 2026 to 30 Nov 2026 | £375 |
| 3 to 6 months late | 1 Dec 2026 to 28 Feb 2027 | £750 |
| More than 6 months late | From 1 Mar 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2026 | £200 |
| 3 months late | 28 Feb 2027 | another £200 |
| 6 months late | 30 May 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 2027 | 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
- 15313867
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 November 2023 (2 years ago)
- Registered office
- Bigil, Dinorwic, Caernarfon, LL55 3EH
- Nature of business
- Electrical installation (SIC 43210)
Other building completion and finishing (SIC 43390)
General cleaning of buildings (SIC 81210) - Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2024
- Last confirmation statement
- 21 November 2025
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 Caernarfon
Other active electrical contractors registered in Caernarfon.
- Continuity Electrical Contractors Ltd2016
- G Parry Electrical Services Ltd2014
- Iwan Fon Electrical Limited2022
- M Williams Electrical Limited2014
- Owen Electrical Contractors GC Limited2017
- Pen Solar Cyf2023
- Snowdonia Refrigeration and Air Conditioning Ltd2013
- Tirion Solutions Ltd2026
All electrical contractors in Caernarfon · All trades in Caernarfon · Electricians across the UK
Frequently asked questions
When are Caillan Harris Ltd's accounts due?
Caillan Harris Ltd's accounts were due at Companies House on 31 August 2026 and the register shows them as overdue.
When is Caillan Harris Ltd's CT600 due?
The CT600 for the period to 30 November 2025 is due at HMRC by 30 November 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2026.
Is Caillan Harris Ltd still trading?
Caillan Harris Ltd is listed as active on the Companies House register (checked 12 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 Caillan Harris Ltd do?
Caillan Harris Ltd is registered under Electrical installation (SIC 43210); Other building completion and finishing (SIC 43390); General cleaning of buildings (SIC 81210).
How old is Caillan Harris Ltd?
Caillan Harris Ltd was incorporated on 28 November 2023, 2 years ago.
Who runs Caillan Harris Ltd?
Caillan Harris Ltd has 1 active director, the longest-serving appointed in Nov 2023. Their names and service addresses are on the Companies House register.
Who owns Caillan Harris Ltd?
One person or company has significant control of Caillan Harris Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Caillan Harris 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 Caillan Harris Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.