- Companies
- Specialist contractors
- Maidenhead
- Haz Mission Critical Ltd
Haz Mission Critical Ltd
- Company number
- 08598247
- Incorporated
- 5 Jul 201313 years trading
- Registered office
- C/O Wilson Partners Limited, Tor, Saint-Cloud Way, Maidenhead, Berkshire, SL6 8BN
- Nature of business
- Other specialised construction activities n.e.c.
Haz Mission Critical Ltd is a 13-year-old private limited company registered in Maidenhead, company number 08598247, one of 53 specialist construction companies in Maidenhead. Its next accounts are due at Companies House on 30 September 2027, and its first CT600 is due at HMRC on 31 October 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 £1M (+55.4%) on the year before, to £2.8M.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £3.7M against £864K owed within a year: 4.3 times cover.
- 10 employees on average, up from 5 the year before.
- 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 |
|---|---|---|---|---|---|
| 31 Oct 2025 | £2.8M | £2.3M | £3.7M | £864K | 10 |
| 31 Oct 2024 | £1.8M | £1.5M | £2.5M | £719K | 5 |
| 31 Oct 2023 | £1M | £673K | £1.2M | £208K | 1 |
| 31 Oct 2022 | £1M | £926K | £1.1M | £98K | 0 |
| 31 Oct 2021 | £922K | £780K | £959K | £41K | 1 |
| 31 Oct 2020 | £1.2M | £849K | £1.7M | £456K | 1 |
| 31 Oct 2019 | £1.1M | £721K | £1.6M | £511K | 1 |
| 31 Oct 2018 | £501K | £1.1M | £1.9M | £1.4M | 3 |
| 31 Oct 2017 | £277K | £331K | £53K | ||
| 31 Oct 2016 | £91K | £110K | £110K | £19K |
Who runs and owns Haz Mission Critical Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| A*** M*** | Director | Jul 2013 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| P*** D*** | Director | Jul 2013 | Jan 2020 |
Person with significant control
Where Haz Mission Critical Ltd is registered
The registered office is in Maidenhead (SL6), in the Windsor and Maidenhead local authority area, South East. Show SL6 8BN on a map.
Other trade companies in SL6
- B&M Cleaning Solutions LtdCleaning companies
- CC Garden Builds LtdBuilders
- Austin Groundwork Surfaces LimitedGroundworks and demolition
- Woodnest Interiors LtdJoiners and carpenters
- Carizmatic Company LimitedMotor traders
- Sakura Electrical LtdElectricians
- Elite Autos & Tyres LtdMotor traders
- Bigfrith End LtdSpecialist contractors
Also registered at this address
5 other companies use the same registered office as Haz Mission Critical Ltd.
- Ardent Developments (Europe) LtdProperty developers
- Mint Maintenance Services LtdFacilities management
- Tarcus Properties LimitedBuilders
- Tob Environmental LimitedPlumbers and heating engineers
- Vida Estates LtdProperty developers
What happens if Haz Mission Critical 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
- 08598247
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 5 July 2013 (13 years ago)
- Registered office
- C/O Wilson Partners Limited, Tor, Saint-Cloud Way, Maidenhead, Berkshire, SL6 8BN
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 24 June 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 Maidenhead
Other active specialist construction companies registered in Maidenhead.
- Holdway Services Limited2011
- JBW Carpentry Ltd.2016
- JP McKim Services Limited2018
- Key Choice Builders Limited2014
- Knowing Retail Limited2013
- Mabel Management Ltd2026
- N Lingham-Clark Ltd2025
- Nylex Projects Limited2015
All specialist construction companies in Maidenhead · All trades in Maidenhead · Specialist contractors across the UK
Frequently asked questions
When are Haz Mission Critical Ltd's accounts due?
Haz Mission Critical 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 Haz Mission Critical Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 October 2026, due by 31 October 2027, and one for the period to 31 December 2026, due by 31 December 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Haz Mission Critical Ltd still trading?
Haz Mission Critical 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 Haz Mission Critical Ltd do?
Haz Mission Critical Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Haz Mission Critical Ltd?
Haz Mission Critical Ltd was incorporated on 5 July 2013, 13 years ago.
Who runs Haz Mission Critical Ltd?
Haz Mission Critical Ltd has 1 active director, the longest-serving appointed in Jul 2013. Their names and service addresses are on the Companies House register.
Who owns Haz Mission Critical Ltd?
One person or company has significant control of Haz Mission Critical Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Haz Mission Critical 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 Haz Mission Critical 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.