- Companies
- Electricians
- Mitcham
- Cas Building Services Ltd
Cas Building Services Ltd
- Company number
- 12595936
- Incorporated
- 11 May 20206 years trading
- Registered office
- 09 Barnfield Ave, Mitcham, Surrey, CR4 1DN
- Nature of business
- Electrical installation; Plumbing, heat and air-conditioning installation
Cas Building Services Ltd is a 6-year-old private limited company registered in Mitcham, company number 12595936, one of 46 electrical contractors in Mitcham. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £4,116 on the year before, to £4,238.
- Net assets rose in 3 of 4 year-on-year comparisons on record.
- Current assets of £8,498 against £4,629 owed within a year: 1.8 times cover.
- 2 employees on average, up from 1 the year before.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £4,238 | £3,887 | £8,498 | £4,629 | 2 |
| 31 May 2024 | £122 | £6 | £707 | £1,046 | 1 |
| 31 May 2023 | £102 | £9 | £805 | £1,279 | 1 |
| 31 May 2022 | £763 | £1,065 | £1,065 | £702 | 1 |
| 31 May 2021 | £357 | £636 | £779 | 1 |
Where Cas Building Services Ltd is registered
The registered office is in Mitcham (CR4), in the Merton local authority area, London. Show CR4 1DN on a map.
Other trade companies in CR4
- Mendevo LimitedFloor and wall tilers
- Az Auto Body Repair LtdMechanics and garages
- Welcome Maintenance LimitedPainters and decorators
- Fixmot LtdMechanics and garages
- MPB Property Care LtdFinishing trades
- Aoo Building Services LtdBuilders
- LDN Plumbing Heating and Cooling LimitedPlumbers and heating engineers
- Dgha Construction LtdBuilders
What happens if Cas Building 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 12595936
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 May 2020 (6 years ago)
- Registered office
- 09 Barnfield Ave, Mitcham, Surrey, CR4 1DN
- Nature of business
- Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220) - Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 10 May 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 Mitcham
Other active electrical contractors registered in Mitcham.
- D N H Electrical Services Ltd2017
- D.L.H. Electrical Services Limited2006
- D.V.C. Services Limited1997
- Diamond Electrical Services ( Surrey ) Ltd2023
- Eirelix IT Resources Ltd2020
- Electrologic Electrical Services Ltd2024
- Felipeinstallations Ltd2026
- Flash Electrical Contracting Ltd2019
All electrical contractors in Mitcham · All trades in Mitcham · Electricians across the UK
Frequently asked questions
When are Cas Building Services Ltd's accounts due?
Cas Building Services Ltd's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is Cas Building Services Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Cas Building Services Ltd still trading?
Cas Building 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 Cas Building Services Ltd do?
Cas Building Services Ltd is registered under Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Cas Building Services Ltd?
Cas Building Services Ltd was incorporated on 11 May 2020, 6 years ago.
What is the penalty if Cas Building 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 Cas Building 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.