- Companies
- Civil engineering
- Leeds
- Nitroflox Ltd
Nitroflox Ltd
- Company number
- 07637800
- Incorporated
- 17 May 201115 years trading
- Registered office
- 402 Timblebeck, Neptune Street, Leeds, LS9 8AR
- Nature of business
- Construction of utility projects for fluids; Construction of water projects
Nitroflox Ltd is a 15-year-old private limited company registered in Leeds, company number 07637800, one of 163 civil engineering contractors in Leeds. Its next accounts are due at Companies House on 16 February 2027, and the CT600 for the period to 16 May 2026 is due at HMRC on 16 May 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 unchanged on the year before, at £1,000.
- Net assets rose in 0 of 9 year-on-year comparisons on record.
- 1 employee on average during the year.
- 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 |
|---|---|---|---|---|---|
| 16 May 2025 | £1,000 | £4,740 | 1 | ||
| 16 May 2024 | £1,000 | £18K | 1 | ||
| 31 May 2023 | £1,000 | £18K | 1 | ||
| 31 May 2022 | £1,000 | £13K | 1 | ||
| 31 May 2021 | £1,000 | £14K | 1 | ||
| 31 May 2020 | £1,000 | £0 | £13K | 1 | |
| 31 May 2019 | £1,000 | £13K | |||
| 31 May 2018 | £1,000 | £11K | |||
| 31 May 2017 | £1,000 | £15K | £13K | ||
| 31 May 2016 | £1,000 | £14K | £13K |
Where Nitroflox Ltd is registered
The registered office is in Leeds (LS9), in the Leeds local authority area, Yorkshire and The Humber. Show LS9 8AR on a map.
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What happens if Nitroflox 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 16 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 17 Feb 2027 to 16 Mar 2027 | £150 |
| 1 to 3 months late | 17 Mar 2027 to 16 May 2027 | £375 |
| 3 to 6 months late | 17 May 2027 to 16 Aug 2027 | £750 |
| More than 6 months late | From 17 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 17 May 2027 | £200 |
| 3 months late | 16 Aug 2027 | another £200 |
| 6 months late | 16 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 16 May 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
- 07637800
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 May 2011 (15 years ago)
- Registered office
- 402 Timblebeck, Neptune Street, Leeds, LS9 8AR
- Nature of business
- Construction of utility projects for fluids (SIC 42210)
Construction of water projects (SIC 42910) - Year end
- 16 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 16 May 2025
- Last confirmation statement
- 17 May 2026
- Previous names
- Proflux Ltd (until 14 Dec 2012)
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 Leeds
Other active civil engineering contractors registered in Leeds.
- Nyatate Ltd2026
- Olm Network Solutions Ltd2022
- P. Furlong Ltd2016
- PB Scaffold Design Limited2009
- Pete-R Design Limited2017
- Pollak Construction Ltd2025
- Primacon Ltd2016
- Prism Network Limited2010
All civil engineering contractors in Leeds · All trades in Leeds · Civil engineering across the UK
Frequently asked questions
When are Nitroflox Ltd's accounts due?
Nitroflox Ltd's next accounts are due at Companies House by 16 February 2027 (in 127 days), covering the period to 16 May 2026.
When is Nitroflox Ltd's CT600 due?
The CT600 for the period to 16 May 2026 is due at HMRC by 16 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 17 February 2027.
Is Nitroflox Ltd still trading?
Nitroflox 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 Nitroflox Ltd do?
Nitroflox Ltd is registered under Construction of utility projects for fluids (SIC 42210); Construction of water projects (SIC 42910).
How old is Nitroflox Ltd?
Nitroflox Ltd was incorporated on 17 May 2011, 15 years ago.
What is the penalty if Nitroflox 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 Nitroflox 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.