- Companies
- Plumbers and heating engineers
- Air Cool Engineering (N.I.) Ltd.
Air Cool Engineering (N.I.) Ltd.
- Company number
- 03435101
- Incorporated
- 17 Sep 199729 years trading
- Registered office
- Unit K, Astonbury Farm, Aston, Hertfordshire, SG2 7EG
- Nature of business
- Plumbing, heat and air-conditioning installation; Other service activities n.e.c.
Air Cool Engineering (N.I.) Ltd. is a 29-year-old private limited company registered in Aston, company number 03435101, one of the UK's plumbing and heating companies. 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 £111K (+17.5%) on the year before, to £746K.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £1.2M against £639K owed within a year: 1.9 times cover.
- 28 employees on average, up from 25 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 |
|---|---|---|---|---|---|
| 31 May 2025 | £746K | £186K | £1.2M | £639K | 28 |
| 31 May 2024 | £635K | £205K | £915K | £460K | 25 |
| 31 May 2023 | £571K | £131K | £1.1M | £664K | 26 |
| 31 May 2022 | £550K | £241K | £765K | £359K | 21 |
| 31 May 2021 | £522K | £218K | £744K | £374K | 27 |
| 31 May 2020 | £551K | £155K | £573K | £154K | 28 |
| 31 May 2019 | £584K | £270K | £1.1M | £871K | 28 |
| 31 May 2018 | £558K | £138K | £756K | £526K | 27 |
| 31 May 2017 | £520K | £361K | £1.1M | £853K | 28 |
| 31 May 2016 | £269K | £106K | £547K | £561K |
Where Air Cool Engineering (N.I.) Ltd. is registered
The registered office is in Aston (SG2), in the East Hertfordshire local authority area, East of England. Show SG2 7EG on a map.
Other trade companies in SG2
- Amkj Construction LtdBuilders
- Terrascape Solution LtdSpecialist contractors
- K Taylor Ac Contractors LimitedPlumbers and heating engineers
- Kcet Services LtdProperty developers
- Saunders Climate Control LtdPlumbers and heating engineers
- Emp Energy LtdElectricians
- TKTK Cock Green Dev LtdProperty developers
- Mario's Building & Landscaping LtdBuilders
What happens if Air Cool Engineering (N.I.) 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
- 03435101
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 September 1997 (29 years ago)
- Registered office
- Unit K, Astonbury Farm, Aston, Hertfordshire, SG2 7EG
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
Other service activities n.e.c. (SIC 96090) - Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 17 September 2026
- Charges (mortgages)
- 0 outstanding of 1 registered
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
Other active plumbing and heating companies.
Frequently asked questions
When are Air Cool Engineering (N.I.) Ltd.'s accounts due?
Air Cool Engineering (N.I.) 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 Air Cool Engineering (N.I.) 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 Air Cool Engineering (N.I.) Ltd. still trading?
Air Cool Engineering (N.I.) 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 Air Cool Engineering (N.I.) Ltd. do?
Air Cool Engineering (N.I.) Ltd. is registered under Plumbing, heat and air-conditioning installation (SIC 43220); Other service activities n.e.c. (SIC 96090).
How old is Air Cool Engineering (N.I.) Ltd.?
Air Cool Engineering (N.I.) Ltd. was incorporated on 17 September 1997, 29 years ago.
What is the penalty if Air Cool Engineering (N.I.) 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 Air Cool Engineering (N.I.) 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.