- Companies
- Civil engineering
- London
- Project121 Ltd
Project121 Ltd
- Company number
- 13089013
- Incorporated
- 18 Dec 20205 years trading
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Construction of utility projects for electricity and telecommunications; Information technology consultancy activities
Project121 Ltd is a 5-year-old private limited company registered in London, company number 13089013, one of 1,853 civil engineering contractors in London. Companies House shows its accounts as overdue: they were due on 30 September 2026.
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 £1,239 (-42.6%) on the year before, to £1,671.
- Net assets rose in 0 of 3 year-on-year comparisons on record.
- Current assets of £4,038 against £2,620 owed within a year: 1.5 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 4 years, 2021 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £1,671 | £4,038 | £2,620 | 0 | |
| 31 Dec 2023 | £2,910 | £4,624 | £2,580 | 1 | |
| 31 Dec 2022 | £18K | £20K | £3,570 | 1 | |
| 31 Dec 2021 | £30K | £28K | £9,758 | 1 |
Where Project121 Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 5PF on a map.
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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 Project121 Ltd files late
If the accounts reach Companies House today, the late filing penalty is £150 (£300 if last year's accounts were also late). It rises at each step below.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2026 to 31 Oct 2026 | £150 |
| 1 to 3 months late | 1 Nov 2026 to 31 Dec 2026 | £375 |
| 3 to 6 months late | 1 Jan 2027 to 31 Mar 2027 | £750 |
| More than 6 months late | From 1 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2027 | £200 |
| 3 months late | 31 Mar 2027 | another £200 |
| 6 months late | 30 Jun 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 2027 | 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
- 13089013
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 December 2020 (5 years ago)
- Registered office
- 167-169 Great Portland Street, 5TH Floor, London, W1W 5PF
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Information technology consultancy activities (SIC 62020) - Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 15 December 2025
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.
- Promergon UK Ltd2025
- Promet Technology Limited1988
- Protechnique for Multi Projects Limited2003
- PRW Rail Ltd2024
- PST International Ltd2025
- PT Planners Limited2009
- Pu Drainage 247 Ltd2023
- Pure Build Ltd2026
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Project121 Ltd's accounts due?
Project121 Ltd's accounts were due at Companies House on 30 September 2026 and the register shows them as overdue.
When is Project121 Ltd's CT600 due?
The CT600 for the period to 31 December 2025 is due at HMRC by 31 December 2026, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2026.
Is Project121 Ltd still trading?
Project121 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 Project121 Ltd do?
Project121 Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Information technology consultancy activities (SIC 62020).
How old is Project121 Ltd?
Project121 Ltd was incorporated on 18 December 2020, 5 years ago.
What is the penalty if Project121 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 Project121 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.