- Companies
- Civil engineering
- London
- Cobaltt Construction Ltd
Cobaltt Construction Ltd
- Company number
- 12207510
- Incorporated
- 16 Sep 20197 years trading
- Registered office
- 105 Hoe Street, London, E17 4SA
- Nature of business
- Construction of other civil engineering projects n.e.c.
Cobaltt Construction Ltd is a 7-year-old private limited company registered in London, company number 12207510, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 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 £5,334 (+78.8%) on the year before, to £12K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £13K against £1,251 owed within a year: more than 10 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £12K | £13K | £1,251 | 0 | |
| 30 Sep 2024 | £6,765 | £7,389 | £1,035 | 0 | |
| 30 Sep 2023 | £2,157 | £1,656 | £0 | 0 | |
| 30 Sep 2022 | £2,354 | £2,033 | £291 | 1 | |
| 30 Sep 2021 | £1,113 | £605 | £238 | 1 | |
| 30 Sep 2020 | £2,672 | £2,269 | £135 | 0 |
Where Cobaltt Construction Ltd is registered
The registered office is in London (E17), in the Waltham Forest local authority area, London. Show E17 4SA on a map.
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Also registered at this address
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What happens if Cobaltt Construction 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 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 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
- 12207510
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 September 2019 (7 years ago)
- Registered office
- 105 Hoe Street, London, E17 4SA
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 15 September 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in London
Other active civil engineering contractors registered in London.
- Cobomech UK Ltd2026
- Cohere Network and Engineering Solution Limited2022
- Community Energy Scheme Northampton Limited2026
- Complete Highways Ltd2023
- Concrete Printed Contractors Ltd2024
- Confictura Ltd2023
- Connect Infrastructure Services Ltd2025
- Connective Data Solutions Ltd2026
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Cobaltt Construction Ltd's accounts due?
Cobaltt Construction Ltd's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Cobaltt Construction Ltd's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Cobaltt Construction Ltd still trading?
Cobaltt Construction Ltd is listed as active on the Companies House register (checked 12 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 Cobaltt Construction Ltd do?
Cobaltt Construction Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Cobaltt Construction Ltd?
Cobaltt Construction Ltd was incorporated on 16 September 2019, 7 years ago.
What is the penalty if Cobaltt Construction 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 Cobaltt Construction Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.