- Companies
- Civil engineering
- London
- Ati Fibrenet Ltd
Ati Fibrenet Ltd
- Company number
- 13098159
- Incorporated
- 23 Dec 20205 years trading
- Registered office
- Level 30, Leadenhall Building Level 30, Leadenhall Street, London, EC3V 4AB
- Nature of business
- Construction of utility projects for electricity and telecommunications; Construction of other civil engineering projects n.e.c.; Wired telecommunications activities
Ati Fibrenet Ltd is a 5-year-old private limited company registered in London, company number 13098159, one of 1,853 civil engineering contractors 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 up £21K (+19.1%) on the year before, to -£87K.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £70K against £169K owed within a year: 0.4 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | -£87K | £70K | £169K | 0 | |
| 31 Dec 2024 | -£107K | £3,560 | £4,270 | £137K | 0 |
| 31 Dec 2023 | -£77K | £5,213 | £120K | 0 | |
| 31 Dec 2022 | -£11K | £216 | £216 | £11K | 0 |
| 31 Dec 2021 | -£1,156 | £287 | £12K | £13K | 0 |
Where Ati Fibrenet Ltd is registered
The registered office is in London (EC3V), in the City of London local authority area, London. Show EC3V 4AB on a map.
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- F and F Electrical Services LtdElectricians
- Lilyame LimitedProperty developers
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What happens if Ati Fibrenet 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 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
- 13098159
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 23 December 2020 (5 years ago)
- Registered office
- Level 30, Leadenhall Building Level 30, Leadenhall Street, London, EC3V 4AB
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Wired telecommunications activities (SIC 61100) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 3 February 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.
- Atlan Civils Ltd2025
- Atlantic Geospatial Ltd2026
- Atlas Construction and Engineering Ltd2020
- Aulona Cable Telecommunication Ltd2018
- Aum Civil Engineering Ltd2023
- Aurora Utilities (Electricity) Limited2023
- Austin Brickwork Limited1998
- Austin Contractors Limited2004
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Ati Fibrenet Ltd's accounts due?
Ati Fibrenet Ltd's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Ati Fibrenet Ltd'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 Ati Fibrenet Ltd still trading?
Ati Fibrenet 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 Ati Fibrenet Ltd do?
Ati Fibrenet Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220); Construction of other civil engineering projects n.e.c. (SIC 42990); Wired telecommunications activities (SIC 61100).
How old is Ati Fibrenet Ltd?
Ati Fibrenet Ltd was incorporated on 23 December 2020, 5 years ago.
What is the penalty if Ati Fibrenet 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 Ati Fibrenet 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.