- Companies
- Civil engineering
- London
- High Key Ltd
High Key Ltd
- Company number
- 11563476
- Incorporated
- 11 Sep 20188 years trading
- Registered office
- 63 Loveridge Road, London, NW6 2DR
- Nature of business
- Construction of utility projects for electricity and telecommunications; Portrait photographic activities; Other specialist photography; Photographic activities not elsewhere classified
High Key Ltd is a 8-year-old private limited company registered in London, company number 11563476, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 10 December 2026, and the CT600 for the period to 10 March 2026 is due at HMRC on 10 March 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 £18K on the year before, to £19K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £75K against £60K owed within a year: 1.2 times cover.
- 2 employees on average during the year.
- 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 |
|---|---|---|---|---|---|
| 10 Mar 2025 | £19K | £75K | £60K | 2 | |
| 10 Mar 2024 | £1,000 | £23K | £18K | 2 | |
| 10 Mar 2023 | £1,000 | £12K | £5,110 | 2 | |
| 10 Mar 2022 | £11K | £26K | £6,888 | 2 | |
| 10 Mar 2021 | £7,844 | £3,659 | £0 | 2 | |
| 17 Mar 2020 | £6,942 | £917 | £12K |
Where High Key Ltd is registered
The registered office is in London (NW6), in the Camden local authority area, London. Show NW6 2DR on a map.
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Shared registered office
127 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 High Key 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 10 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Dec 2026 to 10 Jan 2027 | £150 |
| 1 to 3 months late | 11 Jan 2027 to 10 Mar 2027 | £375 |
| 3 to 6 months late | 11 Mar 2027 to 10 Jun 2027 | £750 |
| More than 6 months late | From 11 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 11 Mar 2027 | £200 |
| 3 months late | 10 Jun 2027 | another £200 |
| 6 months late | 10 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 10 Mar 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
- 11563476
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 September 2018 (8 years ago)
- Registered office
- 63 Loveridge Road, London, NW6 2DR
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Portrait photographic activities (SIC 74201)
Other specialist photography (SIC 74202)
Photographic activities not elsewhere classified (SIC 74209) - Year end
- 10 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 10 March 2025
- Last confirmation statement
- 1 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.
- Hillcon Ltd2024
- Hillfield M Limited2018
- Hitcham Consulting Ltd2022
- Hklove Group UK Ltd2026
- HMTF Ltd2019
- Holad Service Ltd2019
- Hollingsproject Ltd2019
- Holsgrove RM Ltd2026
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are High Key Ltd's accounts due?
High Key Ltd's next accounts are due at Companies House by 10 December 2026 (in 59 days), covering the period to 10 March 2026.
When is High Key Ltd's CT600 due?
The CT600 for the period to 10 March 2026 is due at HMRC by 10 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 11 December 2026.
Is High Key Ltd still trading?
High Key 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 High Key Ltd do?
High Key Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Portrait photographic activities (SIC 74201); Other specialist photography (SIC 74202); Photographic activities not elsewhere classified (SIC 74209).
How old is High Key Ltd?
High Key Ltd was incorporated on 11 September 2018, 8 years ago.
What is the penalty if High Key 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 High Key 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.