- Companies
- Specialist contractors
- London
- Altor UK Limited
Altor UK Limited
- Company number
- 03699333
- Incorporated
- 21 Jan 199927 years trading
- Registered office
- Becket House, 1 Lambeth Palace Road, London, SE1 7EU
- Nature of business
- Other specialised construction activities n.e.c.
Altor UK Limited is a 27-year-old private limited company registered in London, company number 03699333, one of 4,318 specialist construction companies in London. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 £64 (-6%) on the year before, to £1,002.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Dec 2025 | £1,002 | £1,002 | 0 | ||
| 31 Dec 2024 | £1,066 | £1,066 | £0 | 0 | |
| 31 Dec 2023 | £2,892 | £0 | £2,892 | 0 | |
| 31 Dec 2022 | £1,922 | £1,436 | £3,358 | 0 | |
| 31 Dec 2021 | £711 | £45K | £46K | 0 | |
| 31 Dec 2020 | £347 | £1,820 | £2,167 | 0 | |
| 31 Dec 2019 | £1,570 | £1,216 | £2,786 | 0 | |
| 31 Dec 2018 | £959 | £975 | £824 | ||
| 31 Dec 2017 | £812 | £2,252 | £1,440 | ||
| 31 Dec 2016 | £4,092 | £6,095 | £2,003 |
Where Altor UK Limited is registered
The registered office is in London (SE1), in the Lambeth local authority area, London. Show SE1 7EU on a map.
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- Vision Studio Property LimitedProperty developers
- Chaplin Centre 2 LimitedProperty developers
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- Green Lane Cobham LtdProperty developers
- Ig Renewables SPV 10 LtdProperty developers
- Tapenjointers LimitedPlasterers
What happens if Altor UK 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 03699333
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 January 1999 (27 years ago)
- Registered office
- Becket House, 1 Lambeth Palace Road, London, SE1 7EU
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 17 January 2025
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in London
Other active specialist construction companies registered in London.
- Altrix Facilities Ltd2026
- Altrobuilders Ltd2023
- Alturacontracting Ltd2026
- Always Reliable Builders Ltd2019
- Alyaly Ltd2017
- Am (London) Maintenance Ltd2019
- Am PM Property Maintenance & Design Ltd2018
- Amac Mechanical Services Ltd2022
All specialist construction companies in London · All trades in London · Specialist contractors across the UK
Frequently asked questions
When are Altor UK Limited's accounts due?
Altor UK Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Altor UK Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Altor UK Limited still trading?
Altor UK Limited is listed as active on the Companies House register (checked 13 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 Altor UK Limited do?
Altor UK Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Altor UK Limited?
Altor UK Limited was incorporated on 21 January 1999, 27 years ago.
What is the penalty if Altor UK 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 Altor UK Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.