- Companies
- Plumbers and heating engineers
- Leicester
- Williamson Air Conditioning Limited
Williamson Air Conditioning Limited
- Company number
- 16851913
- Incorporated
- 12 Nov 2025
- Registered office
- 65 Avenue Road, Queniborough, Leicester, LE7 3FB
- Nature of business
- Plumbing, heat and air-conditioning installation
Williamson Air Conditioning Limited is a newly incorporated private limited company registered in Leicester, company number 16851913, one of 282 plumbing and heating companies in Leicester. Its next accounts are due at Companies House on 12 August 2027, and its first CT600 is due at HMRC on 11 November 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
Is this your company?
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Where Williamson Air Conditioning Limited is registered
The registered office is in Leicester (LE7), in the Charnwood local authority area, East Midlands. Show LE7 3FB on a map.
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What happens if Williamson Air Conditioning 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 12 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 13 Aug 2027 to 12 Sep 2027 | £150 |
| 1 to 3 months late | 13 Sep 2027 to 12 Nov 2027 | £375 |
| 3 to 6 months late | 13 Nov 2027 to 12 Feb 2028 | £750 |
| More than 6 months late | From 13 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 16851913
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 November 2025
- Registered office
- 65 Avenue Road, Queniborough, Leicester, LE7 3FB
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 November (accounting reference date)
- Accounts type
- No accounts filed yet
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 Leicester
Other active plumbing and heating companies registered in Leicester.
- Wingfield Air Conditioning Limited2023
- Xceedzone Contractors Limited2025
- 1ST Choice Plumbing,Heating &Cooling Ltd2019
- A R V Group Ltd2015
- A.C.Doctors Limited2006
- A.C.Services (UK) Limited2001
- A.H.F Air Conditioning Ltd2026
- A.S.H. Plumbing Heating Ltd2012
All plumbing and heating companies in Leicester · All trades in Leicester · Plumbers and heating engineers across the UK
Frequently asked questions
When are Williamson Air Conditioning Limited's accounts due?
Williamson Air Conditioning Limited's next accounts are due at Companies House by 12 August 2027 (in 303 days), covering the period to 30 November 2026.
When is Williamson Air Conditioning Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 11 November 2026, due by 11 November 2027, and one for the period to 30 November 2026, due by 30 November 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Williamson Air Conditioning Limited still trading?
Williamson Air Conditioning 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 Williamson Air Conditioning Limited do?
Williamson Air Conditioning Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Williamson Air Conditioning Limited?
Williamson Air Conditioning Limited was incorporated on 12 November 2025, less than a year ago.
What is the penalty if Williamson Air Conditioning 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 Williamson Air Conditioning 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.