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- Civil engineering
- Mountain Ash
- Prizm Engineering Ltd
Company profile · Civil engineering
Prizm Engineering Ltd
Prizm Engineering Ltd is a 1-year-old private limited company registered in Mountain Ash, company number 16648205, one of 12 civil engineering contractors in Mountain Ash. 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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Financial snapshot, 2026
From the balance sheet at 31 March 2026, as filed at Companies House.
Who runs and owns Prizm Engineering Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| K*** M*** | Director | Aug 2025 |
| E*** M*** | Director | Mar 2026 |
Person with significant control
Where Prizm Engineering Ltd is registered
The registered office is in Mountain Ash (CF45), in the Rhondda Cynon Taf local authority area, Wales. Show CF45 4NH on a map.
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What happens if Prizm 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 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
- 16648205
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 August 2025 (1 year ago)
- Registered office
- 10 Valley View, Abercynon, Mountain Ash, Mid Glamorgan, CF45 4NH
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 26 March 2026
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 Mountain Ash
Other active civil engineering contractors registered in Mountain Ash.
- R Lewis Rail Services Limited2014
- Air Jointing Limited2026
- C&M Jones Groundworks Limited2020
- Dan Rail Welding Ltd2020
- DSR Groundworks Ltd2015
- Evanhalli Ltd2019
- I Fix Reinforcements Ltd2008
- JLT Rail Limited2020
All civil engineering contractors in Mountain Ash · All trades in Mountain Ash · Civil engineering across the UK
Frequently asked questions
When are Prizm Engineering Ltd's accounts due?
Prizm Engineering Ltd's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Prizm Engineering Ltd'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 Prizm Engineering Ltd still trading?
Prizm 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 Prizm Engineering Ltd do?
Prizm Engineering Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Prizm Engineering Ltd?
Prizm Engineering Ltd was incorporated on 13 August 2025, 1 year ago.
Who runs Prizm Engineering Ltd?
Prizm Engineering Ltd has 2 active directors, the longest-serving appointed in Aug 2025. Their names and service addresses are on the Companies House register.
Who owns Prizm Engineering Ltd?
One person or company has significant control of Prizm Engineering Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Prizm 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 Prizm 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.