- Companies
- Civil engineering
- Doncaster
- Mason Site Safety Ltd
Mason Site Safety Ltd
- Company number
- 16006289
- Incorporated
- 8 Oct 20242 years trading
- Registered office
- 42 West Street, Thorne, Doncaster, DN8 5QY
- Nature of business
- Construction of utility projects for electricity and telecommunications
Mason Site Safety Ltd is a 2-year-old private limited company registered in Doncaster, company number 16006289, one of 170 civil engineering contractors in Doncaster. Its next accounts are due at Companies House on 31 July 2027, and the CT600 for the period to 31 October 2026 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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Financial snapshot, 2025
From the balance sheet at 31 October 2025, as filed at Companies House.
Where Mason Site Safety Ltd is registered
The registered office is in Doncaster (DN8), in the Doncaster local authority area, Yorkshire and The Humber. Show DN8 5QY on a map.
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What happens if Mason Site Safety 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 31 July 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Aug 2027 to 31 Aug 2027 | £150 |
| 1 to 3 months late | 1 Sep 2027 to 31 Oct 2027 | £375 |
| 3 to 6 months late | 1 Nov 2027 to 31 Jan 2028 | £750 |
| More than 6 months late | From 1 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Nov 2027 | £200 |
| 3 months late | 31 Jan 2028 | another £200 |
| 6 months late | 30 Apr 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Oct 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
- 16006289
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 October 2024 (2 years ago)
- Registered office
- 42 West Street, Thorne, Doncaster, DN8 5QY
- Nature of business
- Construction of utility projects for electricity and telecommunications (SIC 42220)
- Year end
- 31 October (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 October 2025
- Last confirmation statement
- 7 October 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 Doncaster
Other active civil engineering contractors registered in Doncaster.
- Meenaghan & Son Civil Engineers Ltd2018
- Mejb Signalling Services Ltd2020
- Mi2FF Ltd2016
- Minbrooke Testing Services Ltd2015
- Moran Paving Limited2023
- Murtagh & Maloney Limited2006
- N&L Pro+ Utilities Limited2025
- Nash Civils Ltd2025
All civil engineering contractors in Doncaster · All trades in Doncaster · Civil engineering across the UK
Frequently asked questions
When are Mason Site Safety Ltd's accounts due?
Mason Site Safety Ltd's next accounts are due at Companies House by 31 July 2027 (in 291 days), covering the period to 31 October 2026.
When is Mason Site Safety Ltd's CT600 due?
The CT600 for the period to 31 October 2026 is due at HMRC by 31 October 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 August 2027.
Is Mason Site Safety Ltd still trading?
Mason Site Safety 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 Mason Site Safety Ltd do?
Mason Site Safety Ltd is registered under Construction of utility projects for electricity and telecommunications (SIC 42220).
How old is Mason Site Safety Ltd?
Mason Site Safety Ltd was incorporated on 8 October 2024, 2 years ago.
What is the penalty if Mason Site Safety 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 Mason Site Safety 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.