- Company number
- 13872682
- Incorporated
- 26 Jan 20224 years trading
- Registered office
- 167-169 Great Portland Street, London, W1W 5PF
- Nature of business
- Construction of domestic buildings; Other specialised construction activities n.e.c.
Healthy Indoor Air UK Ltd is a 4-year-old private limited company registered in London, company number 13872682, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 1 November 2026, and its first CT600 is due at HMRC on 31 January 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 down £3,793 (-59.8%) on the year before, to £2,552.
- Current assets of £13K against £26K owed within a year: 0.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £2,552 | £90 | £13K | £26K | 0 |
| 31 Jan 2024 | £6,345 | £90 | £8,026 | £12K | 1 |
| 31 Jan 2023 | £17K | £3,197 | 0 |
Where Healthy Indoor Air UK Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 5PF on a map.
Other trade companies in W1W
- Civaris LtdSpecialist contractors
- R&R Construction Group LtdBuilders
- Aurum Cooling LtdPlumbers and heating engineers
- Steam Wood Stone LtdFinishing trades
- Hau Developments LimitedProperty developers
- Group Atlas Financial 83 LtdPainters and decorators
- Energy Reward LtdMotor traders
- Holly’S Housekeeping LtdCleaning companies
Shared registered office
1,494 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 Healthy Indoor Air UK 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 1 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 2 Nov 2026 to 1 Dec 2026 | £150 |
| 1 to 3 months late | 2 Dec 2026 to 1 Feb 2027 | £375 |
| 3 to 6 months late | 2 Feb 2027 to 1 May 2027 | £750 |
| More than 6 months late | From 2 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 2 Feb 2027 | £200 |
| 3 months late | 1 May 2027 | another £200 |
| 6 months late | 1 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 1 Feb 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
- 13872682
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 January 2022 (4 years ago)
- Registered office
- 167-169 Great Portland Street, London, W1W 5PF
- Nature of business
- Construction of domestic buildings (SIC 41202)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 1 February (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 25 January 2026
- Previous names
- We Insulate Britain Limited (until 27 Jun 2025)
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in London
Other active building contractors registered in London.
- Healy Builders Limited2014
- Healy Construction Ltd2017
- Hearne House Ltd2018
- Heat Lion Limited2021
- Heat Waves Construction Ltd2016
- Heating and Renovation Ltd2018
- Heaven Estate Agent & Developments Limited2014
- Heaven on Earth Builders Ltd2020
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Healthy Indoor Air UK Ltd's accounts due?
Healthy Indoor Air UK Ltd's next accounts are due at Companies House by 1 November 2026 (in 19 days), covering the period to 1 February 2026.
When is Healthy Indoor Air UK Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 January 2026, due by 31 January 2027, and one for the period to 1 February 2026, due by 1 February 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Healthy Indoor Air UK Ltd still trading?
Healthy Indoor Air UK 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 Healthy Indoor Air UK Ltd do?
Healthy Indoor Air UK Ltd is registered under Construction of domestic buildings (SIC 41202); Other specialised construction activities n.e.c. (SIC 43999).
How old is Healthy Indoor Air UK Ltd?
Healthy Indoor Air UK Ltd was incorporated on 26 January 2022, 4 years ago.
What is the penalty if Healthy Indoor Air UK 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 Healthy Indoor Air UK 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.