- Companies
- Specialist contractors
- Middlesbrough
- A1 Hydro-Stop Limited
A1 Hydro-Stop Limited
- Company number
- 07521710
- Incorporated
- 8 Feb 201115 years trading
- Registered office
- 8 Cleveland View, Cargo Fleet Lane, Middlesbrough, TS3 8NW
- Nature of business
- Other specialised construction activities n.e.c.
A1 Hydro-Stop Limited is a 15-year-old private limited company registered in Middlesbrough, company number 07521710, one of 191 specialist construction companies in Middlesbrough. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £9,078 (+102.9%) on the year before, to £258.
- Net assets rose in 4 of 9 year-on-year comparisons on record.
- Current assets of £577 against £319 owed within a year: 1.8 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £258 | £577 | £319 | 0 | |
| 31 Mar 2025 | -£8,820 | £731 | £9,551 | 0 | |
| 31 Mar 2024 | -£3,191 | £2,383 | £5,529 | 1 | |
| 31 Mar 2023 | £2,387 | £4,533 | £3,051 | 0 | |
| 31 Mar 2022 | £3,375 | £3,266 | £956 | 1 | |
| 31 Mar 2021 | £64 | £2,517 | £3,150 | 1 | |
| 31 Mar 2020 | £1,094 | £934 | £859 | 1 | |
| 31 Mar 2019 | £109 | £327 | £1,734 | ||
| 31 Mar 2018 | £47 | £176 | £2,169 | ||
| 31 Mar 2017 | £187 | £1,206 | £3,215 |
Where A1 Hydro-Stop Limited is registered
The registered office is in Middlesbrough (TS3), in the Middlesbrough local authority area, North East. Show TS3 8NW on a map.
Other trade companies in TS3
- PJS Investment's LtdMotor traders
- S&Z Auto Bodyworks LimitedMechanics and garages
- Z&S Auto Centre LimitedMechanics and garages
- Anth Paint LtdPainters and decorators
- Kaw Engineering Services LimitedElectricians
- Mam Construction LtdBuilders
- S T Offshore Rigging LtdCivil engineering
- Cleveland Landscapes LtdLandscapers and gardeners
What happens if A1 Hydro-Stop Limited 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 31 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 07521710
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 February 2011 (15 years ago)
- Registered office
- 8 Cleveland View, Cargo Fleet Lane, Middlesbrough, TS3 8NW
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 8 February 2026
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Middlesbrough
Other active specialist construction companies registered in Middlesbrough.
- Aaron Parry Ltd2026
- Ac Scaffolding Services Limited2024
- Access Insulation & Coatings Ltd2021
- Access Select Limited2017
- Access the Inaccessible Ltd2025
- Adams J Ltd2016
- Adcompletions Ltd2023
- Advanced Industrial Coatings Ltd2022
All specialist construction companies in Middlesbrough · All trades in Middlesbrough · Specialist contractors across the UK
Frequently asked questions
When are A1 Hydro-Stop Limited's accounts due?
A1 Hydro-Stop Limited's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is A1 Hydro-Stop Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is A1 Hydro-Stop Limited still trading?
A1 Hydro-Stop Limited 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 A1 Hydro-Stop Limited do?
A1 Hydro-Stop Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is A1 Hydro-Stop Limited?
A1 Hydro-Stop Limited was incorporated on 8 February 2011, 15 years ago.
What is the penalty if A1 Hydro-Stop Limited 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 A1 Hydro-Stop Limited 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.