- Companies
- Specialist contractors
- Cumbria Nuclear Solutions Limited
Cumbria Nuclear Solutions Limited
- Company number
- 05699216
- Incorporated
- 6 Feb 200620 years trading
- Registered office
- Pillar House, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HW
- Nature of business
- Other specialised construction activities n.e.c.; Engineering related scientific and technical consulting activities
Cumbria Nuclear Solutions Limited is a 20-year-old private limited company registered in Moor Row, company number 05699216, one of the UK's specialist construction companies. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 down £69 (-2.4%) on the year before, to £2,779.
- Net assets rose in 0 of 5 year-on-year comparisons on record.
- Current assets of £3.7M against £3.7M owed within a year: 1.0 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Mar 2025 | £2,779 | £1.3M | £3.7M | £3.7M | 0 |
| 31 Mar 2024 | £2,848 | £1.7M | £2.7M | £2.7M | 0 |
| 31 Mar 2023 | £1.4M | £3.4M | £3.4M | 0 | |
| 31 Mar 2022 | £1.9M | £5.6M | £5.6M | 0 | |
| 31 Mar 2021 | £46K | £1.5M | £1.5M | 0 | |
| 31 Mar 2020 | £3,000 | £9,260 | £4.3M | £4.3M | 0 |
| 31 Mar 2019 | £3,000 | £2.5M | £2.5M | 0 | |
| 31 Mar 2018 | £3,000 | £43K | £4.9M | £4.9M | |
| 31 Mar 2017 | £3,000 | £3,879 | £728K | £725K | |
| 31 Mar 2016 | £3,000 | £4,411 | £987K | £984K |
Public contracts won
Cumbria Nuclear Solutions Limited has 74 public sector contract awards on record; the ones with their own published value total £60M, from 2018 to 2025. Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- CTM Portal for the NDA Shared Services Alliance37 awards
- Sellafield Ltd26 awards
- Sellafield5 awards
- Sellafield Limited5 awards
- SellafieldLtd1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Sellafield Ltd | DDP00787 SEMAS phase 2 & FST trials | £609K | 4 Aug 2025 |
| Sellafield Ltd | DDP00781 - WAGR Grand Challenge & DLA Support - FY 25/26 | £384K | 27 Jun 2025 |
| Sellafield | DDP00766 - Production of Decommissioning Norms | £50K | 17 Oct 2024 |
| Sellafield | DDP00758 Building History Production Scope FY24_25 | £93K | 13 Jun 2024 |
| Sellafield | DDP00756 Production of Facility Dossiers & Facility Information Matrices Phase 6 | £100K | 30 May 2024 |
| Sellafield Ltd | DDP00736 - Remediation Minor Tasks & Redundant Assets FY24/25 | £18M | 2 May 2024 |
| Sellafield Ltd | DDP00743 - Salt Evaporator and Medium Active Storage (SEMAS) Feasibility Study | £816K | 30 Apr 2024 |
| Sellafield | DDP00732 - BXXX Vent Removal - Construction Phase | £2.7M | 27 Mar 2024 |
| Sellafield | DDP00711 Demolition Works | £753K | 27 Mar 2024 |
| Sellafield Ltd | DDP00721 - B2 Soft Strip | £856K | 18 Oct 2023 |
Showing the 10 most recent of 74.
Where Cumbria Nuclear Solutions Limited is registered
The registered office is in Moor Row (CA24), in the Cumberland local authority area, North West. Show CA24 3HW on a map.
Other trade companies in CA24
- Precision Quality Management Services LimitedCivil engineering
- Butler Timmins LimitedInstallers
- JC Project Managing LtdBuilders
- GMC Plant and Agri Sales LtdMachinery repair and installation
- No Name Auto Services LtdMechanics and garages
- P&E LtdElectricians
- MHM Valet and Detailing Services LtdMechanics and garages
- M J Carr Building Contractors LtdProperty developers
What happens if Cumbria Nuclear Solutions 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 05699216
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 6 February 2006 (20 years ago)
- Registered office
- Pillar House, Westlakes Science & Technology Park, Moor Row, Cumbria, CA24 3HW
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
Engineering related scientific and technical consulting activities (SIC 71122) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 6 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
Other active specialist construction companies.
Frequently asked questions
When are Cumbria Nuclear Solutions Limited's accounts due?
Cumbria Nuclear Solutions Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Cumbria Nuclear Solutions Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Cumbria Nuclear Solutions Limited still trading?
Cumbria Nuclear Solutions 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 Cumbria Nuclear Solutions Limited do?
Cumbria Nuclear Solutions Limited is registered under Other specialised construction activities n.e.c. (SIC 43999); Engineering related scientific and technical consulting activities (SIC 71122).
How old is Cumbria Nuclear Solutions Limited?
Cumbria Nuclear Solutions Limited was incorporated on 6 February 2006, 20 years ago.
Has Cumbria Nuclear Solutions Limited won public sector contracts?
Yes. Cumbria Nuclear Solutions Limited has 74 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £60M), most recently from Sellafield Ltd.
What is the penalty if Cumbria Nuclear Solutions 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 Cumbria Nuclear Solutions 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.