- Companies
- Plumbers and heating engineers
- Swanley
- T Duncan Air Conditioning Limited
T Duncan Air Conditioning Limited
- Company number
- 17217821
- Incorporated
- 13 May 2026
- Registered office
- The Old Barn, Wood Street, Swanley, BR8 7PA
- Nature of business
- Plumbing, heat and air-conditioning installation
T Duncan Air Conditioning Limited is a newly incorporated private limited company registered in Swanley, company number 17217821, one of 27 plumbing and heating companies in Swanley. Its next accounts are due at Companies House on 13 February 2028, and its first CT600 is due at HMRC on 12 May 2028.
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.
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Where T Duncan Air Conditioning Limited is registered
The registered office is in Swanley (BR8), in the Sevenoaks local authority area, South East. Show BR8 7PA on a map.
Other trade companies in BR8
- S.P.M (South East) LtdPlumbers and heating engineers
- Omnidrive Motors LtdMotor traders
- Epx Resins LtdFloor and wall tilers
- SLC Contractors Ltd LtdBuilders
- Build and Beyond CX Consulting LimitedFinishing trades
- Roostanproperty LtdProperty developers
- HL Contract Cleaning Services LtdMechanics and garages
- Fasteasycar LtdMotor traders
Shared registered office
264 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if T Duncan 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 13 February 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 14 Feb 2028 to 13 Mar 2028 | £150 |
| 1 to 3 months late | 14 Mar 2028 to 13 May 2028 | £375 |
| 3 to 6 months late | 14 May 2028 to 13 Aug 2028 | £750 |
| More than 6 months late | From 14 Aug 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2028 | £200 |
| 3 months late | 31 Aug 2028 | another £200 |
| 6 months late | 30 Nov 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 2029 | 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
- 17217821
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 May 2026
- Registered office
- The Old Barn, Wood Street, Swanley, BR8 7PA
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 May (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 Swanley
Other active plumbing and heating companies registered in Swanley.
- Tugas Plumbing Ltd2026
- Younger Plumbers Limited2017
- Ab Building Solutions Ltd2016
- Adaptive Heating Limited2022
- Ar7 Services Ltd2024
- BDG Gas Ltd2026
- Bespoke Heating Services Ltd2017
- Channeled Flow Limited2008
All plumbing and heating companies in Swanley · All trades in Swanley · Plumbers and heating engineers across the UK
Frequently asked questions
When are T Duncan Air Conditioning Limited's accounts due?
T Duncan Air Conditioning Limited's next accounts are due at Companies House by 13 February 2028 (in 488 days), covering the period to 31 May 2027.
When is T Duncan 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 12 May 2027, due by 12 May 2028, and one for the period to 31 May 2027, due by 31 May 2028. Corporation tax is payable 9 months and 1 day after the end of each.
Is T Duncan Air Conditioning Limited still trading?
T Duncan 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 T Duncan Air Conditioning Limited do?
T Duncan Air Conditioning Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is T Duncan Air Conditioning Limited?
T Duncan Air Conditioning Limited was incorporated on 13 May 2026, less than a year ago.
What is the penalty if T Duncan 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 T Duncan 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.