- Companies
- Electricians
- Cardiff
- C&M Site Services Ltd.
C&M Site Services Ltd.
- Company number
- 09503847
- Incorporated
- 23 Mar 201511 years trading
- Registered office
- Radnor House Greenwood Close, Cardiff Gate Business Park, Cardiff, CF23 8AA
- Nature of business
- Electrical installation; Other specialised construction activities n.e.c.
C&M Site Services Ltd. is a 11-year-old private limited company registered in Cardiff, company number 09503847, one of 223 electrical contractors in Cardiff. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 2027.
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 up £8,307 (+7.5%) on the year before, to £119K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £722K against £502K owed within a year: 1.4 times cover.
- 3 employees on average, down from 4 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £119K | £75K | £722K | £502K | 3 |
| 30 Sep 2024 | £111K | £32K | £773K | £454K | 4 |
| 30 Sep 2023 | £236K | £473K | £976K | £375K | 6 |
| 30 Sep 2022 | £304K | £269K | £1.2M | £402K | 6 |
| 30 Sep 2021 | £283K | £147K | £1.3M | £648K | 5 |
| 31 Mar 2020 | £284K | £167K | £761K | £485K | 5 |
| 31 Mar 2019 | £194K | £95K | £485K | £294K | 4 |
| 31 Mar 2018 | £170K | £12K | £359K | £193K | 2 |
| 31 Mar 2017 | £113K | £86K | £230K | £118K | 2 |
| 31 Mar 2016 | £14K | £35K | £62K | £47K | 0 |
Who runs and owns C&M Site Services Ltd.
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| M*** S*** | Director | Mar 2015 |
| C*** T*** | Director | Mar 2015 |
Person with significant control
Charges (secured borrowing)
1 of 1 registered charge is outstanding. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| Santander UK PLC | Outstanding | Nov 2020 |
Where C&M Site Services Ltd. is registered
The registered office is in Cardiff (CF23), in the Cardiff local authority area, Wales. Show CF23 8AA on a map.
Other trade companies in CF23
- Ellisp LtdSpecialist contractors
- J & J Grounds & Buildings Maintenance LtdLandscapers and gardeners
- Halo Mobile Specialists LtdMechanics and garages
- 1ST Choice Accident Repair Centre (Yeovil) LtdMechanics and garages
- Wide Transport LtdMotor traders
- Ace Windscreens LtdMechanics and garages
- Lex Roofing Solutions LtdRoofers
- Taxissories LtdMotor traders
Also registered at this address
8 other companies use the same registered office as C&M Site Services Ltd..
- B & W Electrical (South Wales) LimitedElectricians
- Barry Rubbish Removals LimitedRepair services
- C&M Specialist Installations LimitedElectricians
- Canton Construction LimitedCivil engineering
- G Rose Marine LtdMachinery repair and installation
- Glyn Dulais Developments LimitedProperty developers
- LVT Cardiff LtdFloor and wall tilers
- Roath Housing Company LimitedProperty developers
What happens if C&M Site Services 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2028 | 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
- 09503847
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 March 2015 (11 years ago)
- Registered office
- Radnor House Greenwood Close, Cardiff Gate Business Park, Cardiff, CF23 8AA
- Nature of business
- Electrical installation (SIC 43210)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 23 March 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 Cardiff
Other active electrical contractors registered in Cardiff.
- C&M Specialist Installations Limited2023
- Cag Electrical Ltd2020
- Call2Fix Ltd2016
- Cambi Electrical Limited2025
- Cameratech Electrical Ltd2019
- Cape Services Ltd2022
- Cardiff Electrical Home Rewire Ltd2023
- Cardiff Electricians Ltd2024
All electrical contractors in Cardiff · All trades in Cardiff · Electricians across the UK
Frequently asked questions
When are C&M Site Services Ltd.'s accounts due?
C&M Site Services Ltd.'s next accounts are due at Companies House by 30 June 2027 (in 260 days), covering the period to 30 September 2026.
When is C&M Site Services Ltd.'s CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is C&M Site Services Ltd. still trading?
C&M Site Services 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 C&M Site Services Ltd. do?
C&M Site Services Ltd. is registered under Electrical installation (SIC 43210); Other specialised construction activities n.e.c. (SIC 43999).
How old is C&M Site Services Ltd.?
C&M Site Services Ltd. was incorporated on 23 March 2015, 11 years ago.
Who runs C&M Site Services Ltd.?
C&M Site Services Ltd. has 2 active directors, the longest-serving appointed in Mar 2015. Their names and service addresses are on the Companies House register.
Who owns C&M Site Services Ltd.?
One person or company has significant control of C&M Site Services Ltd.: Cmss Group Ltd (owns 75% or more of the shares).
What is the penalty if C&M Site Services 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 C&M Site Services 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.