- Companies
- Civil engineering
- Mansfield
- Rockside Engineering Ltd
Rockside Engineering Ltd
- Company number
- 16841543
- Incorporated
- 9 Nov 2025
- Registered office
- 83 Warsop Lane, Rainworth, Mansfield, Nottinghamshire, NG21 0AG
- Nature of business
- Construction of other civil engineering projects n.e.c.; Engineering design activities for industrial process and production; Other engineering activities
Rockside Engineering Ltd is a newly incorporated private limited company registered in Mansfield, company number 16841543, one of 43 civil engineering contractors in Mansfield. Its next accounts are due at Companies House on 9 August 2027, and its first CT600 is due at HMRC on 8 November 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Rockside Engineering Ltd is registered
The registered office is in Mansfield (NG21), in the Newark and Sherwood local authority area, East Midlands. Show NG21 0AG on a map.
Other trade companies in NG21
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- D Nelson Electrical LimitedElectricians
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- Evergreen Fencing & Landscapes LimitedLandscapers and gardeners
- Robin Hood Refrigeration LtdPlumbers and heating engineers
- Apex Armour Coatings LtdFinishing trades
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What happens if Rockside Engineering 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 9 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 10 Aug 2027 to 9 Sep 2027 | £150 |
| 1 to 3 months late | 10 Sep 2027 to 9 Nov 2027 | £375 |
| 3 to 6 months late | 10 Nov 2027 to 9 Feb 2028 | £750 |
| More than 6 months late | From 10 Feb 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 16841543
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 November 2025
- Registered office
- 83 Warsop Lane, Rainworth, Mansfield, Nottinghamshire, NG21 0AG
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Engineering design activities for industrial process and production (SIC 71121)
Other engineering activities (SIC 71129) - Year end
- 30 November (accounting reference date)
- Accounts type
- No accounts filed yet
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 Mansfield
Other active civil engineering contractors registered in Mansfield.
- RS Surfacing Solutions Ltd2025
- Rufford Civil Engineering Ltd2008
- Saldon Surfacing Solutions Ltd2020
- Scope Joinery & Shopfitting Limited2008
- Sipson Construction Services Ltd2010
- T&M Railway Fencing Limited2015
- Tarr Rail Ltd2024
- Techcon Solutions Limited2022
All civil engineering contractors in Mansfield · All trades in Mansfield · Civil engineering across the UK
Frequently asked questions
When are Rockside Engineering Ltd's accounts due?
Rockside Engineering Ltd's next accounts are due at Companies House by 9 August 2027 (in 301 days), covering the period to 30 November 2026.
When is Rockside Engineering 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 8 November 2026, due by 8 November 2027, and one for the period to 30 November 2026, due by 30 November 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Rockside Engineering Ltd still trading?
Rockside Engineering 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 Rockside Engineering Ltd do?
Rockside Engineering Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Engineering design activities for industrial process and production (SIC 71121); Other engineering activities (SIC 71129).
How old is Rockside Engineering Ltd?
Rockside Engineering Ltd was incorporated on 9 November 2025, less than a year ago.
What is the penalty if Rockside Engineering 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 Rockside Engineering 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.