- Companies
- Plumbers and heating engineers
- High Wycombe
- CJS Air Conditioning Ltd
CJS Air Conditioning Ltd
- Company number
- 12615993
- Incorporated
- 21 May 20206 years trading
- Registered office
- 4 Sedgmoor Close, Flackwell Heath, High Wycombe, HP10 9BH
- Nature of business
- Plumbing, heat and air-conditioning installation
CJS Air Conditioning Ltd is a 6-year-old private limited company registered in High Wycombe, company number 12615993, one of 120 plumbing and heating companies in High Wycombe. 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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Where CJS Air Conditioning Ltd is registered
The registered office is in High Wycombe (HP10), in the Buckinghamshire local authority area, South East. Show HP10 9BH on a map.
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- Woodys LimitedJoiners and carpenters
- Ah Stottor Building Services LtdFinishing trades
- Bradley Evolve LimitedProperty developers
- The Warmth and Water Group LtdPlumbers and heating engineers
- Epds Home Improvement LtdBuilders
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What happens if CJS Air Conditioning 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
- 12615993
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 May 2020 (6 years ago)
- Registered office
- 4 Sedgmoor Close, Flackwell Heath, High Wycombe, HP10 9BH
- Nature of business
- 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
- 20 May 2026
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in High Wycombe
Other active plumbing and heating companies registered in High Wycombe.
- Corcorans Heating and Plumbing Ltd2025
- CW Gas & Heating Services Ltd2021
- David Bray Plumbing & Heating Limited2011
- E.A.C.Airconditioning Ltd2018
- Emc Plumbing and Heating Ltd2023
- Empire Home Solutions Ltd2026
- Everflame Ltd2020
- F. J. Simmons & Son Ltd2006
All plumbing and heating companies in High Wycombe · All trades in High Wycombe · Plumbers and heating engineers across the UK
Frequently asked questions
When are CJS Air Conditioning Ltd's accounts due?
CJS Air Conditioning Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is CJS Air Conditioning 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 CJS Air Conditioning Ltd still trading?
CJS Air Conditioning 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 CJS Air Conditioning Ltd do?
CJS Air Conditioning Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is CJS Air Conditioning Ltd?
CJS Air Conditioning Ltd was incorporated on 21 May 2020, 6 years ago.
What is the penalty if CJS Air Conditioning 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 CJS Air Conditioning 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.