- Company number
- 05279982
- Incorporated
- 8 Nov 200421 years trading
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Construction of domestic buildings; Electrical installation; Plumbing, heat and air-conditioning installation; Painting
Altair Building Limited is a 21-year-old private limited company registered in London, company number 05279982, one of 12,075 building contractors in London. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £28K (+24.1%) on the year before, to -£87K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £2,433 against £100K owed within a year: 0.0 times cover.
- 2 employees on average during the year.
- 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 |
|---|---|---|---|---|---|
| 30 Nov 2025 | -£87K | £787 | £2,433 | £100K | 2 |
| 30 Nov 2024 | -£115K | £5,946 | £28K | £155K | 2 |
| 30 Nov 2023 | -£115K | £4,500 | £119K | 2 | |
| 30 Nov 2022 | -£71K | £1,809 | £27K | £98K | 2 |
| 30 Nov 2021 | -£13K | £20K | £49K | £62K | 3 |
| 30 Nov 2020 | -£15K | £25K | £35K | £52K | 4 |
| 30 Nov 2019 | -£23K | £33 | £43K | £69K | 0 |
| 30 Nov 2018 | -£352 | £5,528 | £24K | £28K | |
| 30 Nov 2017 | -£4,466 | £793 | £26K | £35K | |
| 30 Nov 2016 | £1,766 | £6,299 | £6,299 | £11K |
Who runs and owns Altair Building Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| Z*** B*** | Director | Nov 2004 |
| Z*** B*** | Secretary | Nov 2004 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| A*** B*** | Director | Nov 2004 | Dec 2023 |
Person with significant control
Where Altair Building Limited 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 Altair Building 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 31 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 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
- 05279982
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 November 2004 (21 years ago)
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Construction of domestic buildings (SIC 41202)
Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220)
Painting (SIC 43341) - Year end
- 30 November (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 8 November 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.
- Altam Construction Ltd2023
- Altek Group Ltd2020
- Alter Fitout Limited2019
- Alterego Building Projects Limited2016
- Alternus Spaces Limited2023
- Altform Construction Ltd2020
- Althaf Limited2026
- Altimus MG Ltd2019
All building contractors in London · All trades in London · Builders across the UK
Frequently asked questions
When are Altair Building Limited's accounts due?
Altair Building Limited's next accounts are due at Companies House by 31 August 2027 (in 322 days), covering the period to 30 November 2026.
When is Altair Building Limited's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is Altair Building Limited still trading?
Altair Building 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 Altair Building Limited do?
Altair Building Limited is registered under Construction of domestic buildings (SIC 41202); Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220); Painting (SIC 43341).
How old is Altair Building Limited?
Altair Building Limited was incorporated on 8 November 2004, 21 years ago.
Who runs Altair Building Limited?
Altair Building Limited has 1 active director, the longest-serving appointed in Nov 2004. Their names and service addresses are on the Companies House register.
Who owns Altair Building Limited?
One person or company has significant control of Altair Building Limited: an individual (owns 75% or more of the shares).
What is the penalty if Altair Building 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 Altair Building 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.