- Companies
- Civil engineering
- Waterco Limited
Waterco Limited
- Company number
- 03577754
- Incorporated
- 9 Jun 199828 years trading
- Registered office
- Eden Court Lon Parcwr Business, Park, Ruthin, Denbighshire, LL15 1NJ
- Nature of business
- Construction of water projects
Waterco Limited is a 28-year-old private limited company registered in Denbighshire, company number 03577754, one of the UK's civil engineering contractors. 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Waterco LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £331K (+73%) on the year before, to £785K.
- Net assets rose in 4 of 6 year-on-year comparisons on record.
- Current assets of £1.8M against £1.6M owed within a year: 1.1 times cover.
- 71 employees on average, up from 60 the year before.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £785K | £609K | £1.8M | £1.6M | 71 |
| 31 Mar 2024 | £453K | £447K | £1.4M | £1.1M | 60 |
| 31 Mar 2023 | £107K | £610K | £1.3M | £1.3M | 62 |
| 31 Mar 2022 | £1.6M | £820K | £1.8M | £361K | 52 |
| 31 Mar 2021 | £1.2M | £674K | £1.3M | £242K | 52 |
| 31 Mar 2020 | £992K | £265K | £995K | £205K | 56 |
| 31 Mar 2019 | £1.1M | £402K | £1M | £216K | 54 |
Public contracts won
Waterco Limited has 6 public sector contract awards on record; the ones with their own published value total £210K, from 2017 to 2026. Source: Contracts Finder and Find a Tender award notices. For 3 of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. These were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Adra (Tai) Cyf1 award
- Carmarthenshire County Council1 award
- Denbighshire County Council1 award
- NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University NHS Trust)1 award
- Keele University1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Adra (Tai) Cyf | Fframwaith Ymgynghori Adeiladu / Construction Consultancy Framework | Ceiling, not shown | 17 Jun 2026 |
| Carmarthenshire County Council | South West & Mid Wales Regional Civil Engineering Services Framework 2025 | Ceiling, not shown | 3 Mar 2025 |
| Denbighshire County Council | Surface Water Management Project | £165K | 4 Jun 2021 |
| NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University NHS Trust) | : IP5 Rooftop Solar Photovoltaic (PV) and Battery Energy Storage System Development | Ceiling, not shown | 7 Apr 2021 |
| Keele University | Consultant for Campus Water Management Plan - AWARD | £25K | 21 Dec 2018 |
| Public Health England | PHE - Porton Down Cold Water Main Design | £20K | 15 Dec 2017 |
Where Waterco Limited is registered
The registered office is in Denbighshire (LL15), in the Denbighshire local authority area, Wales. Show LL15 1NJ on a map.
Other trade companies in LL15
- Glan Clwyd Garage LtdMotor traders
- LP Plumbing Heating LtdPlumbers and heating engineers
- Daem LtdMechanics and garages
- Cutting Hedge Landscapes Commercial LimitedLandscapers and gardeners
- JTW Tool Hire and Sales LtdMachinery repair and installation
- Dragon Fencing LtdLandscapers and gardeners
- LDC Automotive LtdMechanics and garages
- HMH Building and Renovation LtdBuilders
What happens if Waterco 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
- 03577754
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 9 June 1998 (28 years ago)
- Registered office
- Eden Court Lon Parcwr Business, Park, Ruthin, Denbighshire, LL15 1NJ
- Nature of business
- Construction of water projects (SIC 42910)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 2 July 2026
- Charges (mortgages)
- 0 outstanding of 2 registered
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
Other active civil engineering contractors.
Frequently asked questions
When are Waterco Limited's accounts due?
Waterco Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Waterco 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 Waterco Limited still trading?
Waterco 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 Waterco Limited do?
Waterco Limited is registered under Construction of water projects (SIC 42910).
How old is Waterco Limited?
Waterco Limited was incorporated on 9 June 1998, 28 years ago.
Has Waterco Limited won public sector contracts?
Yes. Waterco Limited has 6 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £210K), most recently from Adra (Tai) Cyf.
What is the penalty if Waterco 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 Waterco 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.